分级结构γ-AlOOH的无模板水热制备及其吸附性能
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摘要
以Al(NO_3)_3·9H_2O和尿素分别为铝源和沉淀剂,采用无模板水热法180℃保温12 h制备了长球状分级结构γ-AlOOH,通过X射线衍射、扫描电子显微镜、透射电子显微镜和氮气吸附-脱附法对所得产物进行表征,研究了γ-AlOOH纳米结构形成机理和其对重金属离子Cr(Ⅵ)、甲基橙和刚果红的吸附性能。结果表明:长球状分级结构γ-AlOOH的平均长度为1.5μm、宽度为1μm,比表面积和平均孔容为146.33 m~2/g与0.37 cm~3/g;对重金属离子Cr(Ⅵ)、甲基橙和刚果红表现出了优良的吸附性能,其最大吸附量分别为14.36mg/g、84.93mg/g和258.02 mg/g。
Long-sphere like hierarchical γ-AlOOH was prepared by a facile template-free hydrothermal method at 180 ℃ for 12 h with aluminum nitrate( Al(NO_3)_3·9H_2O) as an aluminum source and urea as a homogeneous precipitation solvent. The obtained sample was characterized by X-ray powder diffraction,scanning electron microscopy,transmission electron microscopy and N_2 adsorption desorption technique,respectively. The possible formation mechanism of the long-sphere like γ-AlOOH was discussed. The adsorption properties for Cr( Ⅵ),Methyl orange,Congo red were also examined. The results indicate that the size of the obtained long-sphere like hierarchical γ-AlOOH is an average length of1. 5 μm and an avarege width of 1 μm. The sample has the specific surface area of 146. 33 m~2/g and an average pore volume of 0. 37 cm~3/g. Also,the hierarchical γ-AlOOH shows the superior removal efficiency for Cr( Ⅵ),Methyl orange and Congo red with the maximum adsorption capacities of 14. 36,84. 93 and 258. 02 mg/g,respectively.
Long-sphere like hierarchical γ-AlOOH was prepared by a facile template-free hydrothermal method at 180 ℃ for 12 h with aluminum nitrate( Al(NO_3)_3·9H_2O) as an aluminum source and urea as a homogeneous precipitation solvent. The obtained sample was characterized by X-ray powder diffraction,scanning electron microscopy,transmission electron microscopy and N_2 adsorption desorption technique,respectively. The possible formation mechanism of the long-sphere like γ-AlOOH was discussed. The adsorption properties for Cr( Ⅵ),Methyl orange,Congo red were also examined. The results indicate that the size of the obtained long-sphere like hierarchical γ-AlOOH is an average length of1. 5 μm and an avarege width of 1 μm. The sample has the specific surface area of 146. 33 m~2/g and an average pore volume of 0. 37 cm~3/g. Also,the hierarchical γ-AlOOH shows the superior removal efficiency for Cr( Ⅵ),Methyl orange and Congo red with the maximum adsorption capacities of 14. 36,84. 93 and 258. 02 mg/g,respectively.
引文
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[4]祝雅娟,付猛,唐昭芳.三维有序大孔碳的合成及其在染料敏化太阳能电池中的应用[J].人工晶体学报,2013,42(6):1113-1116.
[5]汤睿,李平.分级结构纳米氧化铝的可控合成及应用[J].化学进展,2012,24(2/3):284-293.
[6]徐骁龙,张辉,刘盛楠,等.TiO 2三维有序大孔材料的表面特性研究[J].人工晶体学报,2013,42(3):461-465.
[7]李小红,江向平,文思逸,等.不同形貌纳米α-Fe2O3粉体水热合成及其催化高氯酸铵热分解研究[J].人工晶体学报,2013,42(6):1132-1137.
[8]Wang Z,Du H,Gong J,et al.Facile synthesis of hierarchical flower-likeγ-AlO OH films via hydrothermal route on quartz surface[J].Colloid.Surf.A.,2014,450(1):76-82.
[9]吕勇,陆文聪,张良苗,等.核壳结构AlO OH的制备、表征及其生长机制[J].物理化学学报,2009,25(7):1391-1396.
[10]Feng Y L,Lu W C,Zhang L M,et al.One-step synthesis of hierarchical cantaloupe-like AlO OH superstructures via a hydrothermal route[J].Cryst.Growth.Des.,2008,8(4):1426-1429.
[11]李秀峡,郭小蕊,梁琦,等.空心椭圆状分级结构γ-AlO OH的无模板水热制备及吸附性能研究[J].重庆理工大学学报,2015,29(11):60-65.
[12]Zhang L,Wei S Y,Lin J,et al.Template-free preparation of bunches of aligned boehmite nanowires[J].J.Phys.Chem.B.,2006,110(43):21680-21683.
[13]Zhu Y,Hou H W,Tang G L,et al.Synthesis of three-quarter-sphere-likeγ-AlO OH superstructures with high adsorptive capacity[J].Eur.J.Inorg.Chem.,2010,6:872-878.
[14]Zhang L M,Lu W,Yan L,et al.Hydrothermal synthesis and characterization of core/shell AlO OH microspheres[J].Micropor Mesopor Mater,2009,119(1/3):208-216.
[15]Cai W Q,Chen S G,Yu J G,et al.Template-free solvothermal synthesis of hierarchical boehmite hollow microspheres with strong affinity toward organic pollutants in water[J].Mater.Chem.Phys.,2013,138(1):167-173.
[16]Meng F C,Rong G,Zhang X L,et al.Facile hydrothermal synthesis of hierarchically structuredγ-AlO OH for fast Congo red removal[J].Mater.Lett.,2014,129:114-117.
[17]Ge J,Deng K,Cai W,et al.Effect of structure-directing agents on facile hydrothermal preparation of hierarchicalγ-Al2O3and their adsorption performance toward Cr(VI)and CO2[J].J.Colloid.Interf.Sci.,2013,401:34-39.
[18]Cai W Q,Yu J,Jaroniec M.Template-free synthesis of hierarchical spindle-likeγ-Al2O3materials and their adsorption affinity towards organic and inorganic pollutants in water[J].J.Mater.Chem.,2010,20(22):4587-4594.
[19]Meng F C,Liang Q,Ren H S,et al.Low-cost solvothermal synthesis of hierarchical structureγ-AlO OH and its application to remove Cr(VI),methyl orange and congo red from contaminated water[J].Curr.Nanosci.,2015,11(2):434-438.
[20]Lan S,Guo N,Liu L,et al.Facile preparation of hierarchical hollow structure gamma alumina and a study of its adsorption capacity[J].Appl.Surf.Sci.,2013,283(11):1032-1040.