纳米多孔二氧化钛空心球的水热法制备及其对Cr(Ⅵ)的吸附特性  

Synthesis of Porous TiO_2 Hollow Spheres by Hydrothermal Method and Their Adsorption Property to Cr(Ⅵ)

作　　者：向炜成[1,2] 胡鹏[2] 张星[1,2] 姚明水[2] 徐瑞芬[1] 袁方利[2] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]中国科学院过程工程研究所,北京100190

出　　处：《过程工程学报》2011年第4期678-683,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50974111;10905068)

摘　　要：利用水热法一步合成了TiO2.结构、形貌表征结果显示,所得产物为纯相锐钛矿型多孔空心结构,平均粒径为172nm.以此吸附剂对Cr(Ⅵ)的吸附实验结果表明,溶液pH对TiO2吸附性能影响显著,在pH为2.7时,产物最大吸附率为86%,随pH值升高,吸附率逐渐降低.其等温吸附行为很好地符合朗缪尔单分子层吸附模型,通过计算得到产物对Cr(Ⅵ)的理论最大单位吸附量为23mg/g.产物吸附Cr(Ⅵ)后,使用碱液可将吸附的Cr(Ⅵ)离子脱附,表现出了极好的重复使用性能.Cr(Ⅲ)共存对TiO2的Cr(Ⅵ)离子吸附能力没有明显影响.Anatase TiO2 was synthesized by a facile hydrothermal method. The analytical results of morphology and structure show that the product exhibits porous hollow structure with average diameter of 172 nm. The adsorption results of the product to Cr（VI） reveal that its adsorption ability is strongly dependent on the pH value of the solution. When the pH is 2.7, the maximum adsorption rate of Cr（VI） is obtained as 86%. With fiarther increasing of pH value, the adsorbed rate of Cr（VI） decreases gradually. The adsorption data to Cr（VI） is well accordance with the Langmuir adsorption model, and the maximum adsorption capacity of the product for Cr（VI） is determined to be 23 mg/g through theoretical calculation. In addition, the adsorbed Cr（VI） could be easily eluted using alkali solution, which favors the recycle of the adsorbent. Addition of Cr（III） into the Cr（VI） solution does not influence its adsorption capacity to Cr（VI） apparently.

关 键 词：吸附 CR(VI) 二氧化钛 多孔空心球 

分 类 号：TQ424.29[化学工程]