染料化合物在改性介孔TiO_2上的吸附  

Adsorption of dye compounds to modified mesoporous TiO_2

作　　者：刘瑶[1] 杜平[1] 王玉萍[1,2] 

机构地区：[1]南京师范大学化学与材料科学学院,南京210097 [2]化工污染控制与资源化江苏省高校重点实验室,南京理工大学,南京210093

出　　处：《环境化学》2014年第6期976-984,共9页Environmental Chemistry

基　　金：国家自然科学基金(51278253;21177061);江苏省环保科技专项基金(2013002);化工污染控制与资源化江苏省高校重点实验室(南京理工大学)创新基金(30920140122008);江苏省生物医药功能材料协同创新中心和南京师范大学光电重点实验室基金资助

摘　　要：以聚乙烯醇-碘复合物修饰的介孔TiO2纳米材料为吸附剂,研究了介孔TiO2对亚甲基蓝、甲基橙、茜素红和二甲酚橙染料化合物的吸附作用.考察了4种染料初始浓度和初始pH值对吸附的影响.实验结果表明,染料化合物的结构和性质影响介孔TiO2对它们的吸附平衡时间和吸附量.二甲酚橙、甲基橙、茜素红和亚甲基蓝有最佳吸附去除率的初始pH值分别为2.0、2.0、3.0和8.0;平衡吸附时间分别为100 min、10 min、100 min和60 min.介孔TiO2对亚甲基蓝、茜素红、二甲酚橙的饱和吸附量分别为80.32 mg·g-1、78.72 mg·g-1、71.64 mg·g-1,甲基橙的饱和吸附量超过200 mg·g-1.改性介孔TiO2对亚甲基蓝、茜素红、二甲酚橙的吸附符合二级动力学方程.The adsorption performance of methylene blue,methyl orange,alizarin red and the xylenol orange on PVA-I modified mesoporous TiO2 who studied. The influences of the initial dyes concentration and the initial solution pH on the adsorption efficiency of dyes were investigated. The results showed that dye compounds with different structures and pH of dyes solution had different properties. The adsorption removal efficiency of the dyes were maximal when the initial pH of solution of xylenol orange,methyl orange,alizarin red and methylene blue was 2.0,3.0,2.0 and8. 0,respectively,and the equilibrium adsorption time was 100 min,10 min,100 min and 60 min.respectively. The saturation absorptive capacity of methylene blue,alizarin red and xylenol orange adsorbed on mesoporous TiO2 reached 80.32 mg·g-1,78.72 mg·g-1and 71.64 mg·g-1,separately,and the saturated adsorption capacity of methyl orange was more than 200 mg·g-1. The kinetic data of xylenol orange,methyl orange,alizarin red on mesoporous TiO2 fitted well the pseudo-secondorder kinetics. The mechanisms of absorption were discussed.

关 键 词：吸附 改性TIO2 亚甲基蓝 甲基橙 茜素红 二甲酚橙 

分 类 号：X791[环境科学与工程—环境工程]