捆束状分级结构γ-AlOOH的无模板水热制备及吸附性能研究  

Synthesis of Bundle-like Hierarchical γ-AlOOH via Template-free Hydrothermal Method and Its Adsorption

作　　者：权婷婷 郭小蕊 谢天翼 林慧兴[2] 孟范成[1,2] 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]中国科学院无机功能材料与器件重点实验室,上海200050

出　　处：《陶瓷学报》2017年第3期398-403,共6页Journal of Ceramics

基　　金：国家自然基金(51102289);中国科学院无机功能材料与器件重点实验室开放基金(KLIFMD–2011–04;KLIFMD–2015-06)

摘　　要：以硝酸铝为铝源,磷酸氢二钠为沉淀剂,采用无模板水热法制备分级结构γ-AlOOH,研究了磷酸氢二钠和硝酸铝的浓度变化对合成产物的物相、形貌及吸附性能的影响。通过XRD、FESEM、TEM和氮气吸附脱附法对样品进行了表征,探讨了分级结构γ-AlOOH的形成机理。实验结果表明,在反应温度为190℃和反应时间为24h硝酸铝浓度0.05mol/L、磷酸氢二钠浓度0.0025mol/L条件下合成的长度为2.0μm-3.0μm,宽为1.0μm-1.4μm,组成单元为一维纳米纤维分级结构γ-AlOOH材料吸附性最好,对刚果红的最大吸附量为98.6mg/g;其比表面积为151.20m^2/g,最可几孔径为3.5nm。The hierarchical 3,-A1OOH was prepared by a facile template-free hydrothermal method, using aluminum nitrate （Al（NO3）3.9H2O） as aluminum source and sodium phosphate dibasic （Na2HPO4） as precipitator. The effects of concentration of Na2HPO4 and Al（NO3）3·9H2O on the phase, morphology and adsorption property of the synthesized products were studied. The obtained sample was characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （FESEM）, transmission electron microscopy （TEM） and N2 adsorption/ desorption technique. The possible formation mechanism of hierarchical y-AlOOH was discussed. The experimental results show that when the concentrations of AI（NO3）3 and Na2HPO4 were 0.05 mol/L and 0.0025 mol/L, the hierarchical γ-AlOOH was synthesized after reaction at 190℃ for 24 h. The obtained sample with an average length of 2.0-3.0 μm and a width of 1.0-1.4 μm was assembled by one-dimensional fiber. The hierarchical y-AlOOH showed the superior removal efficiency for Congo red with the maximum adsorption capacity of 98.6 mg/g. And it exhibited a BET surface area of 151.20 m2/g and an average pore size of 3.5 nm.

关 键 词：勃姆石 捆束状 水热法 吸附 

分 类 号：TQ174.75[化学工程—陶瓷工业]