Li^+掺杂TiO2对甲基橙溶液吸附性能研究  

Adsorption capacity of Li^+-doped TiO2 for methyl orange wastewater

作　　者：杨秀美[1] 邹勇[1] 王其庆 阮运飞 Yang Xiumei;Zou Yong;Wang Qiqing;Ruan Yunfei(Kaili University,Kaili 556011;Kaili Jian Hui Environmental Safety Technical Service Company,Kaili 556006)

机构地区：[1]凯里学院,凯里556011 [2]凯里剑辉环境安全技术服务公司,凯里556006

出　　处：《化工新型材料》2020年第12期209-213,共5页New Chemical Materials

基　　金：贵州省教育厅青年科技人才成长项目(黔教合KY字[2017]332)。

摘　　要：以固相合成法制备Li^+掺杂TiO2为吸附剂,对甲基橙模拟废水进行吸附实验,研究甲基橙吸附在Li-TiO2上的动力学和热力学机理。结果表明:在常压和298K下,当pH=6、甲基橙模拟废水初始浓度20mg/L、Li^+掺杂TiO2投加量1.0g/L时,吸附容量18.32mg/g,甲基橙去除率为91.6%。Li-TiO2对甲基橙吸附动力学规律符合Lagergren准一级吸附模型,k1=0.0189min-1,Ea=-5.567kJ/mol。吸附行为服从Langmuir和Freundlich方程,属单分子层吸附。热力学函数ΔH<0,ΔG<0,ΔS>0,吸附为自发放热过程。可见Li-TiO2是一种去除模拟废水中甲基橙的优良吸附剂。The adsorption experiment was carried out on simulated wastewater of methyl orange,and Li^+-doped TiO2(Li-TiO2)material prepared by solid phase synthesis as adsorbent.The thermodynamics behavior and kinetics mechanism of methyl orange on Li-TiO2 were studied.The results showed that the adsorption capacity on Li-TiO2(1.0g/L)was up to 18.32mg/g,and the removal rate of methyl orange was up to 91.6%under the condition of 298K,atmospheric pressure,pH 6 and c0 of 20mg/L.Besides,the adsorption dynamics of methyl orange on the apparent of Li-TiO2 fitted the Lagergren Pseudo-first-order model which the adsorption rate constant(k1)and the apparent activation energy(Ea)of methyl orange on Li-TiO2 was 0.0189min-1 and-5.567kJ/mol respectively.It was a monolayer adsorption that the adsorption behavior obeyed the Langmuir and Freundlich equation.Furthermore,thermodynamic data(ΔH<0,ΔG<0 andΔS>0)illustrated that the adsorption of methyl orange on Li-TiO2 was proved as a spontaneous exothermic process.To sum up,Li-TiO2 was really an excellent adsorbent for removing methyl orange in simulated wastewater.

关 键 词：锂离子掺杂二氧化钛 吸附容量 动力学 热力学 甲基橙模拟废液 

分 类 号：O647.3[理学—物理化学]