麦秸秆热解炭对水溶液中亚甲基蓝的吸附研究  

A Study of Methylene Blue Adsorption by Bio-char from Pyrolysis of Wheat Straw

作　　者：行念东[1] 王玥露[1] 杨杰[1] 韩润平[1] 

机构地区：[1]郑州大学化学系,河南郑州450001

出　　处：《遵义师范学院学报》2011年第6期97-99,106,共4页Journal of Zunyi Normal University

基　　金：河南省基础研究项目(92300410030)

摘　　要：利用麦秸秆热解炭作为吸附剂,研究对溶液中亚甲基蓝(MB)的吸附特征。溶液pH、吸附时间和染料浓度影响吸附量。当pH>8时有利于MB的吸附,吸附时间增加,单位质量的吸附剂的吸附量增加,随着MB浓度增加,吸附量增加。吸附等温线用Langmuir、Freundlich、Sip模型拟合,Sip模型拟合效果最好。293K时最大吸附量为12.03±0.41mg/g,吸附过程是自发的吸热过程。Bin-char, a by-products from slow pyrolysis of wheat straw, was used as adsorbent for the removal of methylene blue （MB） from solution. Adsorption studies were performed at different pH, contact time and dye concentration in the batch mode. The pH value of the solution influences the adsorption capacity significantly and a higher pH of solution favors the adsorption capacity for MB. The equilibrium data were modeled with Langmuir, Freundlich and Sip equations. Overall, the data were best fitted with Sip model. The maximal adsorption capacity from Sip model was 12.03 ±0.41 mg/g at 293 K. Thermodynamic parameters were c^dculated and the results show that the process was spontaneous and endothermic in nature. Bin-char, a low cost and eco-friendiy adsorbent, can be used to adsorb cationic dye from solution.

关 键 词：热解炭 吸附 亚甲基蓝 

分 类 号：X703[环境科学与工程—环境工程]