玉米秸秆生物炭对苯胺的吸附  

Adsorption of Aniline on Corn Straw Biochar

作　　者：仇银燕[1] 张平[1] 李科林[1] 阙胜峰 

机构地区：[1]中南林业科技大学环境科学与工程研究所,湖南长沙410004

出　　处：《化工环保》2015年第1期6-10,共5页Environmental Protection of Chemical Industry

基　　金：国家环保部公益性行业科研专项(201009047);湖南省科技计划项目(2012NK3111);湖南省重点学科建设项目(2006180)

摘　　要：以玉米秸秆为原料制备生物炭吸附剂,研究了生物炭对水中苯胺的吸附性能。表征结果显示:制备的生物炭的比表面积为449.7 m2/g,体积平均粒径为103μm,主要以小粒径存在;制备的生物炭表面以碱性含氧官能团为主,含量为1.31 mmol/g。实验结果表明:在溶液p H 3、生物炭加入量10 g/L、吸附温度313 K、吸附时间3.0h的最佳反应条件下处理初始苯胺质量浓度为400 mg/L的苯胺溶液,苯胺去除率为94.0%,吸附量为37 mg/g;生物炭对苯胺的吸附过程符合拟二级动力学方程,吸附等温线满足Freundlich等温吸附方程;生物炭对苯胺的吸附是自发、吸热的过程;吸附过程中存在着水分子从生物炭表面的解吸。The biochar adsorbent was prepared using corn straw as material,and its adsorption capability to aniline in water was studied. The characterization results show that：The products are mainly small particles with 449.7 m^2/g of specific surface area and 103 μm of volume average particle diameter;The surface of the biochar is covered by alkaline oxygen-containing functional groups with 1.31 mmol/g of content. The experimental results show that： Under the optimum reaction conditions of solution pH 3,biochar dosage 10 g/L,adsorption temperature 313 K,adsorption time 3.0 h and initial aniline mass concentration 100 mg/L,the aniline removal rate is 94.0% and the adsorption capacity is 37 mg/g;The adsorption process accords with the pseudo-second-order kinetics equation,and the adsorption isotherm meets Freundlich isothermal adsorption equation;The adsorption of aniline on biochar is a spontaneous and endothermic process;Water molecules are desorbed from the biochar surface in the adsorption process.

关 键 词：玉米秸秆生物炭 苯胺 吸附动力学 吸附热力学 

分 类 号：X712[环境科学与工程—环境工程]