Buscar en
Boletín de la Sociedad Española de Cerámica y Vidrio
Toda la web
Inicio Boletín de la Sociedad Española de Cerámica y Vidrio The role anions on the synthesis of AlOOH nanoparticles using simple solvotherma...
Journal Information
Vol. 57. Issue 2.
Pages 66-72 (March - April 2018)
Share
Share
Download PDF
More article options
Visits
1880
Vol. 57. Issue 2.
Pages 66-72 (March - April 2018)
DOI: 10.1016/j.bsecv.2017.06.002
Open Access
The role anions on the synthesis of AlOOH nanoparticles using simple solvothermal method
El papel de los aniones en la síntesis de nanopartículas de AlOOH utilizando el método solvotérmico simple
Visits
...
Mozaffar Abdollahifara,b,
Corresponding author
abdollahifar@gmail.com

Corresponding author.
, Masoud Hidaryana, Pouria Jafaria
a Department of Chemical Engineering, College of Science, Kermanshah Branch, Islamic Azad University, Kermanshah 67131, Iran
b Department of Chemical Engineering, National Taiwan University, No. 1, Roosevelt Road, Section 4, Daan District, Taipei 10617, Taiwan, ROC
Article information
Abstract
Full Text
Bibliography
Download PDF
Statistics
Figures (4)
Show moreShow less
Tables (2)
Table 1. Textural properties of synthesized boehmite samples.
Table 2. Porosity structures and positions of synthesized boehmite samples.
Show moreShow less
Abstract

Effect of aluminium salts on the synthesis of AlOOH nanostructures has been successfully investigated in detail using solvothermal method, when ethanol and NaOH are solvent and pH adjusting agent, respectively. Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and field emission scanning electron microscopy (FESEM), were used to characterize the synthesized samples. The specific surface area, pore size distribution and pore structure of the different AlOOH structures were also discussed by the N2 adsorption/desorption test. According to our experimental results, the structure characterization revealed that for synthesized AlOOH nanostructures no obvious XRD peaks arising from other phases of alumina are found indicating pure AlOOH phase of products. Furthermore, the nitrogen adsorption and desorption measurements indicated that the obtained AlOOH nanoparticles from aluminium chloride at basic condition possess a high BET surface area of approximately 90m2/g.

Keywords:
AlOOH
Salts
Nanoparticle
Solvothermal
Resumen

El efecto de las sales de aluminio sobre la síntesis de las nanoestructuras de AlOOH ha sido analizado en detalle satisfactoriamente usando el método solvotérmico, cuando el etanol y el NaOH son el disolvente y el agente de regulación del pH, respectivamente. Para clasificar las muestras sintetizadas se utilizaron la espectroscopia infrarroja por transformada de Fourier (FTIR), difracción de rayos X por polvo (XRD) y microscopia electrónica de barrido de emisión de campo (FESEM). El área superficial específica, la distribución del tamaño del poro y la estructura de poros de las diferentes estructuras de AlOOH también se debatieron mediante la prueba de adsorción/desorción de N2. De acuerdo con nuestros resultados experimentales, la clasificación de la estructura reveló que en las nanoestructuras de AlOOH sintetizadas no se observan picos XRD evidentes derivados de otras fases de la alúmina que indican la fase pura de AlOOH de los productos. Además, las mediciones de adsorción y desorción de nitrógeno indicaron que las nanopartículas de AlOOH obtenidas a partir de cloruro de aluminio en estado básico poseen un área superficial BET elevada, de aproximadamente 90m2/g.

Palabras clave:
AlOOH
Sales
Nanopartícula
Solvotérmico
Full Text
Introduction

The preparation and characterization of boehmite (aluminium oxyhydroxides) nanoparticles and their applications in different fields such as ceramic, catalysts and supports have received considerable attention during the past decades [1–24]. Moreover, different alumina oxides, such as transition aluminas (γ-Al2O3, θ-Al2O3, δ-Al2O3, etc.) and corundum (α-Al2O3) are obtained from boehmite (AlOOH). Transition aluminas include a series of metastable forms that exist on an extended temperature range, but all of them lead to α-Al2O3 by calcining at high temperatures. Transition aluminas are extensively used as ceramics [8,25,26], catalysts and catalyst supports [1–3,10,15,17,18,20,24], and membranes [27,28] because of their high surface area, mesoporosity, and surface acidity. Owing to these, several researches have broadly addressed to develop new routes to prepare boehmite structures [6,7,11,22,29–40]. Additionally, our group have reported some results on synthesis of boehmite nanostructures, and also as catalyst supports [1,3,6,7,9–11,17,18,20–24].

It is worth noting that for many of the current applications of boehmite nanoparticles not only is it needed to control the size and morphology of particles but it is also crucial to achieve long-time stability of their aqueous dispersion. Many routes have been generally used for the preparation of boehmite nanoparticles. Most of the functionalized boehmite nanoparticles used in several applications were synthesized by using hydrolysis and condensation of aluminium alkoxide under ambient conditions and its further peptization [41]. Furthermore, sol–gel [39], precipitation [36,42,43] and solvothermal or hydrothermal routes [6,11,22,33,35] can be achieved under a very wide range of synthesis conditions. Among them, solvothermal technique has been broadly employed as the effective method do to the mild synthesis conditions and flexible change of experimental parameters. Generally speaking, the experimental reaction parameters usually have great effects on the preparation and characterization of boehmite nanoparticles under solvothermal condition. In this method, the synthesis conditions, such as the temperature and time of the solvothermal processing, the initial pH, the pH adjusting agents, template and surfactant as well as the aluminium salts is also important [6,7,11,16,21,22,31,44–47]. Undoubtedly, the research and development of producing AlOOH with various structures are beneficial for many branches of modern science and technology. However, the reports concerning the synthesis of boehmite by a simple and environmentally benign method and their interesting properties are still limited. To our best knowledge the effect of different aluminium salts on the synthesis of AlOOH via solvothermal route have not been reported. This work introduces the synthesis of boehmite nanoparticles using aluminium chloride and nitrate as the precursor via solvothermal method. The structure and morphology were investigated by the XRD, FTIR, N2 adsorption–desorption, and FESEM.

Experimental details

The starting materials utilized are Al(NO3)3·9H2O, AlCl3, NaOH and ethanol 96%, were purchased from Scharlau, Spain, all chemical reagents were of analytical grade and were used as purchased without further purification. In order to investigate the effect of different anion in alkali solution on boehmite synthesis, two aluminium salts, nitrate and chloride were used as sources.

Typically, 40mmol either Al(NO3)3·9H2O or AlCl3 was dissolved in 120ml of ethanol (96%), and it was stirred for 10–15min at room temperature. NaOH solution (2M) were subsequently added drop by drop to the solution to give lacteous precipitates. At this point, the pH value of the reaction mixture was ∼5 or 11, then transferred into Teflon-lined stainless steel autoclave (250ml, volume), and then placing them in an oven with a temperature of 180°C for 24h. These samples were treated by centrifugation, rinsed with ethanol 96% and DI water several times, and then dried overnight at 65°C in an oven. The boehmite samples prepared by nitrate (N) and chloride (C) at different pH were labelled N-5, C-5, N-11 and C-11, respectively.

Fourier transform infrared (FTIR) spectra were obtained using a RAYLEIGH WQF-510 spectrometer in the range 400–4000cm−1 at room temperature. The product phases obtained under different experimental conditions were identified using a X-ray powder diffraction (XRD) patterns, using a D8 ADVANCE, BRUKER X-ray diffractometer, equipped with CuKα radiation (λ=1.54Å). Data were collected from 5 to 80° 2θ, counting for 10sec every 0.02° 2θ step. The surface morphology and particles sizes were analyzed by a field emission scanning electron microscope (FESEM, HITACHI S-4160 XL30). The specific surface area of synthesized samples was determined using BEL SORP, MINI II-310 analyser. In this technique the Brunauer–Emmett–Teller (BET) equation was employed to calculate the specific surface area and the mean sizes of pores were calculated using the original Barrett, Joyner, and Halenda (BJH) method. Before analyses, the samples were degassed under a vacuum at 120°C for at least 4h.

Experimental results and discussion

The phase structure and purity of the typical samples were examined by XRD. Fig. 1 shows the XRD patterns of the samples synthesized in this paper. All diffraction peaks of boehmite nanoparticles were in good agreement with AlOOH (JCPDS no. 001-1283) which is the orthorhombic cell with lattice parameters of a=3.78Å, b=11.8Å, and c=2.85Å. The distinguished peaks at the angles of 14.3, 28.1, 38.3, 45.7, 48.9, 51.6, 54.9, 64.6, 66.7, and 72.1° corresponded to the (020), (120), (140), (131), (200), (160), (151), (071), (022) and (251) plans of the orthorhombic boehmite, respectively. The orthorhombic structure of AlOOH is proven by comparing the XRD pattern with others reported in literature [6,11,45]. No obvious XRD peaks arising from other phases of alumina are found indicating pure AlOOH phase of the solvothermal product. The intensities of all the diffraction peaks were gradually increased when the nitrate salt is used, indicating that higher crystallinity or larger crystal size of boehmite can be obtained when the aluminium source was nitrate. Generally, the crystallinity of boehmite depended on the experimental parameters such as type of aluminium salt and pH. Very often, additional crystalline phases such as gibbsite and or bayerite are formed beside boehmite. However, this work showed that the precipitation of boehmite from aluminium salt (nitrate or chloride) solution with NaOH via solvothermal route was able to produce boehmite as a single phase. Generally, it is known that the chemical and physical properties can be significantly different for low- and well-crystallized boehmites, even though their crystal structure is just the same. Furthermore, there is no evident shift of the diffraction lines, suggesting that the layers are not rotated or displayed due to the change of pH or aluminium salt.

Fig. 1.

XRD patterns of as-synthesized samples, (a) N-5, (b) C-5, (c) N-11 and (d) C-11.

(0.17MB).

The FTIR analysis of AlOOH has been well studied [6,11,16,22,23] and is characterized by prominent OH stretching and bending modes associated with the interlayer hydrogen bonds of the structure. Fig. 2 shows the infrared spectrum of a AlOOH nanoparticle prepared as described earlier in this research. Generally, for all samples, the FTIR spectrums were similar regardless of the slight difference in intensity some of peaks. As shown in Fig. 2, for the boehmite samples, five strong bands at 480, 633, 746, 1073, and 1160cm−1 were observed. The band at 480cm−1 is assigned to the angle deformation of OA(OH), and the (OH)AlO angle bending results in the peak at 633cm−1, and 746cm−1 which is attributed to the stretching vibrations of AlOAl in the distorted AlO6. The sharp peak at 1072cm−1 and small shoulder at 1160cm−1 are assigned to the angle bending of the H bonds in the octahedral structure of boehmite (OHAlO) and Angle deformation (wagging) of the H bonds in the octahedral structure of boehmite (OHAlO), respectively. The acute peak in 1389cm−1 corresponds to the amounts of nitrate anion, which was not thoroughly removed by washing. As a comparison, the intensity of this band is stronger for the synthesized samples with nitrate anion as has not been washed well. The weak band at 1640cm−1 can be assigned to the stretching and bending modes of the adsorbed water molecule, and this absorbance in the spectra of AlOOH nanoarchitectures are very weak, indicating a very small amount of physically adsorbed water molecules. The asymmetric and symmetric stretches of the interlayer OH groups are seen at 3295 and 3095cm−1, respectively (Fig. 3).

Fig. 2.

FTIR spectra of as-synthesized samples, (a) N-5, (b) C-5, (c) N-11 and (d) C-11.

(0.14MB).
Fig. 3.

FESEM images of as-synthesized samples, (a) N-5, (b) C-5, (c) N-11 and (d) C-11.

(0.98MB).

The microstructure of the synthesized AlOOH nanoparticles were studied using FE-SEM. Fig. 4 shows the representative FESEM images of N-5 (a), C-5 (b), N-11 (c) and C-11 (d) samples, and we carried out the higher and lower magnification analysis for all samples. According to FESEM images, different anion has a low effect on the morphologies of as-prepared AlOOH. The obtained images indicate that all samples are nearly spherical in shape. We can see that the formed particles only for N-5 sample possess uniform size distribution and are homogeneous without preferentially oriented shapes, for this sample more than 90 percent of particles were sized lower than 50nm in diameter. It is interesting that the particles in the C-5 sample were formed nano rods with size several ten nanometres to several micrometres in length. The particle size distribution histograms are shown in right hand of FESEM images in Fig. 4. As comparison, the nano-rods are produced when pH adjusting agent is NaOH and same pH (∼5), and nitrate salt applied with hydrothermal method [11], whereas, we have obtained nanoparticles with narrow particle size distribution. Therefore, the solvent in the solvothermal synthesis has more effect on the characteristics and structure of final products.

Fig. 4.

(A) Nitrogen adsorption–desorption isotherm and (B) the corresponding pore size distribution curve for samples, (a) N-5, (b) C-5, (c) N-11 and (d) C-11.

(0.17MB).

The N2 adsorption–desorption isotherms shown in Fig. 4 were used to determine the surface area and the type of porosity for boehmite samples synthesized under different conditions. Table 1 lists the results of textural properties, porosity structures and positions of synthesized AlOOH nanostructures. These results imply that onions in the solvothermal method is quite important to prepare AlOOH. Fig. 4 shows the N2 adsorption–desorption isotherms measured at 77K and the corresponding pore size distributions curves (inset) calculated via the Barret-Joyner-Halenda (BJH) [48] for all samples. The shape of these isotherms belonged to type IV, as indicated by convex curvature of the isotherms at the sub-monolayer range and by occurrence of a narrow hysteresis loop at high P/P0 range, which proved that this fibrous boehmite was a mesoporous material. The hysteresis loops of these samples seem to be type H2, indicating that they have good pore connectivity with ink-bottle or channel-like pores [49]. It could be seen that the pore sizes for samples synthesized by nitrate and chloride were mostly located between 2-35nm and 2–40, respectively. The pore structure parameters for all the samples including total surface area from BET, total pore volume from BET and BJH method, micro porosity, mesoporosity, average pore diameter are listed in Table 2. The C-5 and C-11 have highest and lowest surface area and pore volume, respectively. But samples synthesized by nitrates did not show more change on the surface area with increasing of solution pH. In other hand, the C-5 sample exhibited the high specific surface area of 90m2/g. Therefore, the obtained surface area for sample C-5 is comparable and higher than other boehmites, such as cantaloupe-like AlOOH (55.5m2/g) [50], γ-AlOOH hollow microspheres (93.6m2/g) [51], lamellar γ-AlOOH architectures (75.02m2/g) [52], micro-mesoporous flower-like γ-AlOOH (69m2/g) [6], boehmite (87.5m2/g) [53]. In general, larger specific surface area and pore volume are favourable for many applications such as catalysis and adsorbents.

Table 1.

Textural properties of synthesized boehmite samples.

Sample name  Microporosity, %  Mesoporosity, %
  ≤2 (nm)  2–5 (nm)  5–10 (nm)  10–15 (nm)  15–35 (nm)  35–50 (nm) 
N-5  12.3  20.7  26.5  23.1  17.1  0.3 
C-5  17.8  39.9  29.5  9.1  2.6  1.1 
N-11  11.5  17.6  26.7  25.5  18.4  0.1 
C-11  13.0  30.6  27.5  13.4  9.7  5.8 
Table 2.

Porosity structures and positions of synthesized boehmite samples.

Sample name  Stotala (m2g−1Vpb (cm3g−1Vpc (cm3g−1Vmicd (cm3g−1Vmese (cm3g−1Dpf (nm) 
N-5  48.4  0.348  0.350  0.043  0.307  28.7 
C-5  90.1  0.373  0.377  0.068  0.309  16.6 
N-11  46.0  0.347  0.351  0.042  0.309  30.2 
C-11  39.3  0.275  0.277  0.037  0.240  28.0 
a

Total surface area from BET method.

b

Total pore volume from BET method.

c

Total pore volume from BJH method.

d

Microporosity.

e

Mesoporosity.

f

Average pore diameter.

Conclusions

Boehmite nanoparticles were successfully prepared via a chemical solvothermal treatment without using any surfactant or hard templates. The synthetic parameters such as different anions and two pH value of 5 and 11 were systematically studied to achieve a good porous property. The boehmite sample with middle crystallinity, nano particle morphology and its surface area of 90m2/g was prepared when used aluminium chloride as precursor and pH value was controlled at 5. The advantages of these nanoparticles include its simplicity and applications in ceramics, adsorption, catalyst and catalyst supports, and this method could be applied in the preparation of other oxyhydroxide powders.

Acknowledgement

The authors are grateful for the supports from Islamic Azad University, Kermanshah Branch.

References
[1]
M. Abdollahifar, M. Haghighi, A.A. Babaluo, S.K. Talkhoncheh.
Sono-synthesis and characterization of bimetallic Ni–Co/Al2O3–MgO nanocatalyst: effects of metal content on catalytic properties and activity for hydrogen production via CO2 reforming of CH4.
Ultrason. Sonochem., 31 (2016), pp. 173-183
[2]
C. Karami, M. Abdollahifar, F. Jahani, A. Farrokhi, M.A. Taher.
The preparation and characterization of flower-like boehmite nanoparticles-SA: as new and reusable nanocatalyst for the synthesis of 2-aryl-1H-benzimidazoles.
Inorg. Nano-Metal Chem., 47 (2017), pp. 626-631
[3]
S.K. Talkhoncheh, M. Haghighi, S. Minaei, H. Ajamein, M. Abdollahifar.
Synthesis of CuO/ZnO/Al2O3/ZrO2/CeO2 nanocatalyst via homogeneous precipitation and combustion methods used in methanol steam reforming for fuel cell grade hydrogen production.
RSC Adv., 6 (2016), pp. 57199-57209
[4]
F. Salimi, M. Abdollahifar, P. Jafari, M. Hidaryan.
J. Serb. Chem. Soc., 82 (2017), pp. 203-213
[5]
B. Sun, X. Li, R. Zhao, M. Yin, Z. Wang, Z. Jiang, C. Wang.
Hierarchical aminated PAN/γ-AlOOH electrospun composite nanofibers and their heavy metal ion adsorption performance.
J. Taiwan Inst. Chem. Eng., 62 (2016), pp. 219-227
[6]
M. Abdollahifar, M.R. Zamani, E. Beiygie, H. Nekouei.
Synthesis of micro-mesopores flower-like γ-Al2O3 nano-architectures.
J. Serb. Chem. Soc., 79 (2014), pp. 1007-1017
[7]
N. Haghnazari, M. Abdollahifar, F. Jahani.
The effect of NaOH and KOH on the characterization of mesoporous AlOOH nanostructures in the hydrothermal route.
J. Mex. Chem. Soc., 58 (2014), pp. 95-98
[8]
R. Iler.
Fibrillar colloidal boehmite; progressive conversion to gamma, theta, and alpha aluminas.
J. Am. Ceram. Soc., 44 (1961), pp. 618-624
[9]
H. Ajamein, M. Haghighi, R. Shokrani, M. Abdollahifar.
On the solution combustion synthesis of copper based nanocatalysts for steam methanol reforming: effect of precursor ultrasound irradiation and urea/nitrate ratio.
J. Mol. Catal. A: Chem., 421 (2016), pp. 222-234
[10]
M. Abdollahifar, M. Haghighi, A.A. Babaluo.
Syngas production via dry reforming of methane over Ni/Al2O3–MgO nanocatalyst synthesized using ultrasound energy.
J. Ind. Eng. Chem., 20 (2014), pp. 1845-1851
[11]
M. Abdollahifar.
Synthesis and characterisation of γ-Al2O3 with porous structure and nanorod morphology.
J. Chem. Res., 38 (2014), pp. 154-158
[12]
B.K. Park, Y.S. Lee, K.K. Koo.
Preparation of highly porous aluminum hydroxide gels by hydrolysis of an aluminum sulfate and mineralizer.
J. Ceram. Process. Res., 11 (2010), pp. 64-68
[13]
Sh Minaei, M. Haghighi, N. Jodeiri, M. Abdollahifar, H. Ajamein.
influence of CeO2 on fuel cell grade hydrogen production from steam reforming of methanol over nanostructured mixed oxides of Cu, Zn and Al synthesized via urea-nitrate combustion method.
J. Appl. Res. Chem., 8 (2014), pp. 33-44
[14]
S. Minaei, M. Haghighi, N. Jodeiri, H. Ajamein, M. Abdollahifar.
Urea-nitrates combustion preparation of CeO2-promoted CuO/ZnO/Al2O3 nanocatalyst for fuel cell grade hydrogen production via methanol steam reforming.
Adv. Powder Technol., 28 (2017), pp. 842-853
[15]
S. Khajeh Talkhoncheh, M. Haghighi, M. Abdollahifar, H. Ajamein.
Urea-nitrate combustion synthesis and physicochemical characterization of CuO (20)/ZnO (30)/Al2O3 (50) nanocatalyst from different precursors used in hydrogen production from methanol.
J. Appl. Chem., 9 (2014), pp. 89-102
[16]
M. Abdollahifar.
Effect of pH on the characteristics of boehmite nanostructures synthesized using hydrothermal method.
J. Appl. Chem., 8 (2013), pp. 69-78
[17]
R. Shokrani, M. Haghighi, N. Jodeiri, H. Ajamein, M. Abdollahifar.
Fuel cell grade hydrogen production via methanol steam reforming over CuO/ZnO/Al2O3 nanocatalyst with various oxide ratios synthesized via urea-nitrates combustion method.
Int. J. Hydrogen Energy, 39 (2014), pp. 13141-13155
[18]
S.R. Yahyavi, M. Haghighi, S. Shafiei, M. Abdollahifar, F. Rahmani.
Ultrasound-assisted synthesis and physicochemical characterization of Ni–Co/Al2O3–MgO nanocatalysts enhanced by different amounts of MgO used for CH4/CO2 reforming.
Energy Convers. Manage., 97 (2015), pp. 273-281
[19]
R.K. Bera, S.G. Mhaisalkar, D. Mandler, S. Magdassi.
Formation and performance of highly absorbing solar thermal coating based on carbon nanotubes and boehmite.
Energy Convers. Manage., 120 (2016), pp. 287-293
[20]
J. Baneshi, M. Haghighi, N. Jodeiri, M. Abdollahifar, H. Ajamein.
Homogeneous precipitation synthesis of CuO–ZrO2–CeO2–Al2O3 nanocatalyst used in hydrogen production via methanol steam reforming for fuel cell applications.
Energy Convers. Manage., 87 (2014), pp. 928-937
[21]
F. Salimi, M. Abdollahifar, A.R. Karami.
The effect of NaOH and KOH on the characterization of mesoporous AlOOH in the solvothermal route.
Ceram.-Silikaty, 60 (2016), pp. 273-277
[22]
E. Ameri, M. Abdollahifar, M.R. Zamani, H. Nekouei.
The role of urea on the hydrothermal synthesis of boehmite nanoarchitectures.
Ceram.-Silikaty, 60 (2016), pp. 162-168
[23]
M. Abdollahifar, A.R. Karami, N. Haghnazari, C. Karami.
Synthesis of porous boehmite nanostructures: effects of time and temperature in the hydrothermal method.
Ceram.-Silikaty, 59 (2015), pp. 305-310
[24]
J. Baneshi, M. Haghighi, N. Jodeiri, M. Abdollahifar, H. Ajamein.
Urea–nitrate combustion synthesis of ZrO2 and CeO2 doped CuO/Al2O3 nanocatalyst used in steam reforming of biomethanol for hydrogen production.
Ceram. Int., 40 (2014), pp. 14177-14184
[25]
H. Belhouchet, M. Hamidouche, N. Bouaouadja, V. Garnier, G. Fantozzi.
Elaboration and characterization of mullite–zirconia composites from gibbsite, boehmite and zircon.
Ceram.-Silikaty, 53 (2009), pp. 205-210
[26]
E. Zemtsova, A. Monin, V. Smirnov, B. Semenov, N. Morozov.
Formation and mechanical properties of alumina ceramics based on Al2O3 micro-and nanoparticles.
Phys. Mesomech., 18 (2015), pp. 134-138
[27]
V. Vatanpour, S.S. Madaeni, L. Rajabi, S. Zinadini, A.A. Derakhshan.
Boehmite nanoparticles as a new nanofiller for preparation of antifouling mixed matrix membranes.
J. Membr. Sci., 401 (2012), pp. 132-143
[28]
Y.-E. Miao, R. Wang, D. Chen, Z. Liu, T. Liu.
Electrospun self-standing membrane of hierarchical SiO2@ γ-AlOOH (Boehmite) core/sheath fibers for water remediation.
ACS Appl. Mater. Interfaces, 4 (2012), pp. 5353-5359
[29]
W. Cai, J. Yu, S. Mann.
Template-free hydrothermal fabrication of hierarchically organized γ-AlOOH hollow microspheres.
Microporous Mesoporous Mater., 122 (2009), pp. 42-47
[30]
X.Y. Chen, Z.J. Zhang, X.L. Li, S.W. Lee.
Controlled hydrothermal synthesis of colloidal boehmite (-AlOOH) nanorods and nanoflakes and their conversion into – Al2O3 nanocrystals.
Solid State Commun., 145 (2008), pp. 368-373
[31]
S. Elbasuney.
Continuous hydrothermal synthesis of AlO(OH) nanorods as a clean flame retardant agent.
Particuology, 22 (2015), pp. 66-71
[32]
K. Feng, D. Rong, W. Ren, X. Wen.
Hierarchical flower-like γ-AlOOH and γ-Al2O3 microspheres: synthesis and adsorption properties.
Mater. Express., 5 (2015), pp. 371-375
[33]
T. He, L. Xiang, W. Zhu, S. Zhu.
H2SO4-assisted hydrothermal preparation of γ-AlOOH nanorods.
Mater. Lett., 62 (2008), pp. 2939-2942
[34]
Y. Hu, C. Liu, Y. Zhang, N. Ren, Y. Tang.
Microwave-assisted hydrothermal synthesis of nanozeolites with controllable size.
Microporous Mesoporous Mater., 119 (2009), pp. 306-314
[35]
G. Ji, M. Li, G. Li, G. Gao, H. Zou, S. Gan, X. Xu.
Hydrothermal synthesis of hierarchical micron flower-like γ-AlOOH and γ-Al2O3 superstructures from oil shale ash.
Powder Technol., 215 (2012), pp. 54-58
[36]
J. Kong, B. Chao, T. Wang, Y. Yan.
Preparation of ultrafine spherical AlOOH and Al2O3 powders by aqueous precipitation method with mixed surfactants.
Powder Technol., 229 (2012), pp. 7-16
[37]
O. Krivoruchko, A. Zhuzhgov, V. Bolotov, Y.Y. Tanashev, I.Y. Molina, V. Parmon.
New approach to the novel synthesis of boehmite (γ-AlOOH) by microwave irradiation of gibbsite: kinetics of solid-phase reactions and dielectric properties of the reactants.
Catal. Ind., 6 (2014), pp. 79-87
[38]
S. Liu, C. Chen, Q. Liu, Y. Zhuo, D. Yuan, Z. Dai, J. Bao.
Two-dimensional porous γ-AlOOH and γ-Al2O3 nanosheets: hydrothermal synthesis, formation mechanism and catalytic performance.
RSC Adv., 5 (2015), pp. 71728-71734
[39]
Z. Wang, W. Ji, H. Du, X. Li, J. Gong, J. Ma, J. Xu.
Formation of AlOOH and silica composite hierarchical nanostructures thin film by sol–gel dip-coating for superhydrophobic surface with high adhesion force.
J. Sol–Gel Sci. Technol., 72 (2014), pp. 511-517
[40]
L. Zhang, W. Lu, L. Yan, Y. Feng, X. Bao, J. Ni, X. Shang, Y. Lv.
Hydrothermal synthesis and characterization of core/shell ALOOH microspheres.
Microporous Mesoporous Mater., 119 (2009), pp. 208-216
[41]
P.A. Buining, C. Pathmamanoharan, J.B.H. Jansen, H.N. Lekkerkerker.
Preparation of colloidal boehmite needles by hydrothermal treatment of aluminum alkoxide precursors.
J. Am. Ceram. Soc., 74 (1991), pp. 1303-1307
[42]
Z.Q. Jiang, H.W. Ma, J. Yang, L. Wang.
Synthesis of nanosized pseudoboehmite and γ-Al2O3 by Control Precipitation Method.
Adv. Mater. Res., 684 (2013), pp. 46-52
[43]
S. Kirchner, S. Teychené, M. Boualleg, A. Dandeu, C. Frances, B. Biscans.
Effect of precipitation process parameters on boehmite properties: in situ optical monitoring.
Chem. Eng. J., 280 (2015), pp. 658-669
[44]
T. Mousavand, S. Ohara, M. Umetsu, J. Zhang, S. Takami, T. Naka, T. Adschiri.
Hydrothermal synthesis and in situ surface modification of boehmite nanoparticles in supercritical water.
J. Supercrit. Fluids, 40 (2007), pp. 397-401
[45]
G. Li, Y. Liu, D. Liu, L. Liu, C. Liu.
Synthesis of flower-like Boehmite (AlOOH) via a simple solvothermal process without surfactant.
Mater. Res. Bull., 45 (2010), pp. 1487-1491
[46]
N. Xu, Z. Liu, S. Bian, Y. Dong, W. Li.
Template-free synthesis of mesoporous γ-alumina with tunable structural properties.
Ceram. Int., 42 (2016), pp. 4072-4079
[47]
J. Xiao, H. Ji, Z. Shen, W. Yang, C. Guo, S. Wang, X. Zhang, R. Fu, F. Ling.
Self-assembly of flower-like γ-AlOOH and γ-Al2O3 with hierarchical nanoarchitectures and enhanced adsorption performance towards methyl orange.
RSC Adv., 4 (2014), pp. 35077-35083
[48]
E.P. Barrett, L.G. Joyner, P.P. Halenda.
The determination of pore volume and area distributions in porous substances. I. Computations from nitrogen isotherms.
J. Am. Chem. Soc., 73 (1951), pp. 373-380
[49]
R. Tettenhorst, D.A. Hofmann.
Crystal chemistry of boehmite.
Clays Clay Miner., 28 (1980), pp. 373-380
[50]
Y. Feng, W. Lu, L. Zhang, X. Bao, B. Yue, Y. Lv, X. Shang.
One-step synthesis of hierarchical cantaloupe-like AlOOH superstructures via a hydrothermal route.
Cryst. Growth Des., 8 (2008), pp. 1426-1429
[51]
W. Caia, J. Yua, S. Mann.
Template-free hydrothermal fabrication of hierarchically organized γ-AlOOH hollow microspheres.
Microporous Mesoporous Mater., 122 (2009), pp. 42-47
[52]
H. Hou, Y. Zhu, G. Tang, Q. Hu, Lamellar.
γ-AlOOH architectures: synthesis and application for the removal of HCN.
Mater. Charact., 68 (2012), pp. 33-41
[53]
D. Mishra, S. Anand, R.K. Panda, R.P. Das.
Effect of anions during hydrothermal preparation of boehmites.
Mater. Lett., 53 (2002), pp. 133-137
Copyright © 2017. SECV
Article options
Tools
es en pt
Política de cookies Cookies policy Política de cookies
Utilizamos cookies propias y de terceros para mejorar nuestros servicios y mostrarle publicidad relacionada con sus preferencias mediante el análisis de sus hábitos de navegación. Si continua navegando, consideramos que acepta su uso. Puede cambiar la configuración u obtener más información aquí. To improve our services and products, we use "cookies" (own or third parties authorized) to show advertising related to client preferences through the analyses of navigation customer behavior. Continuing navigation will be considered as acceptance of this use. You can change the settings or obtain more information by clicking here. Utilizamos cookies próprios e de terceiros para melhorar nossos serviços e mostrar publicidade relacionada às suas preferências, analisando seus hábitos de navegação. Se continuar a navegar, consideramos que aceita o seu uso. Você pode alterar a configuração ou obter mais informações aqui.