烧结聚乙烯-活性炭的亚甲基蓝吸附动力学  

Adsorption behavior of methylene blue on polyethylene-active carbon

作　　者：肖凯军[1] 何婷琳[1] 

机构地区：[1]华南理工大学轻工与食品学院,广州510640

出　　处：《重庆大学学报（自然科学版）》2013年第11期127-132,共6页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(21176092);"十二五"国家科技支撑计划课题资助项目(2011BAE16B04);广东省产学研项目资助项目(2010B090400512;2009B090200020);广州市科技支撑计划资助项目(2010Z1-E071)

摘　　要：开展烧结聚乙烯-活性炭(PE-AC)吸附亚甲基蓝(MB)动力学研究。通过考察MB初始浓度及时间对吸附作用的影响,表征PE-AC的吸附特性,主要采用Langmuir、Freundilch等温模型及准一动力学方程、准二级动力学方程和颗粒内扩散方程对亚甲蓝吸附等温线及吸附动力学进行分析。结果表明:吸附初期的吸附作用随温度和浓度的增加而显著增强,Freundlich方程能更好地描述吸附等温线。吸附初期为准一级动力学过程,吸附后期为准二级动力学过程。吸附热力学研究发现吸附过程为自发吸热过程,且ΔHθ和ΔSθ分别为10.875kJ/mol和0.0515kJ/(mol·K)。The adsorption kinetics of methylene blue （MB） on the sintered high density polyethylene-active carbon （PE-AC） with respect to the initial dye concentration and time is investigated. The kinetic processes of MB adsorption is described by applying Langmuir, Freundlich isotherms models and the pseudo-first- order, pseudo-second-order and modified intra-particle diffusion models. The results show that significant increase in initial adsorption rate is observed with the increase temperature and initial MB concentration. The equilibrium adsorption is well described by the Freundlich isotherm model. The initial adsorption kinetics is more accurately represented by pseudo-first-order and the later adsorption kinetics is more accurately represented by pseudo-second-order. The calculation values of thermodynamic parameters present that the adsorption is spontaneous and endothermic in nature, and enthalpy （△Hθ） and entropy （△Sθ） are determined as 10. 875 kJ/mol and 0. 0515 kJ/（mol K） respectively.

关 键 词：烧结聚乙烯-活性炭 亚甲基蓝 吸附 吸附动力学 

分 类 号：TQ420.4[化学工程]