稻壳活性炭对活性艳蓝KN-R的脱色研究  

Decolorization Study of Reactive Brilliant Blue KN-R by Activated Carbon from Rice Husk

作　　者：张平[1] 李科林[1] 仇银燕[1] 程飞[1] 匡文浩 

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：《环境科学与技术》2014年第1期110-113,134,共5页Environmental Science & Technology

基　　金：国家环保部公益性行业科研专项资助项目(201009047);湖南省科技计划项目(2012NK3111);湖南省重点学科建设项目(2006180);湖南省土水污染控制与资源化技术重点实验室资助项目

摘　　要：将稻壳在微波条件下制备成活性炭吸附剂,研究其对活性艳蓝KN-R的吸附特性。通过静态实验,考察了pH值、温度、时间、溶液起始浓度和吸附剂用量对吸附过程的影响。结果表明,当pH为2和12时吸附效果较好,最大吸附量分别为303.03、384.62 mg/g;随着温度的升高,达到吸附平衡的时间缩短;等温吸附过程可以用Langmuir方程来描述;动力学实验表明,吸附过程更符合拟二级动力学模型;热力学数据分析发现,吸附过程是自发进行的吸热过程。Rice husk was modified into an activated carbon adsorbent under the microwave irradiation and character of the adsorption was studied on reactive brilliant blue KN-R. By using passive absorption method, experiments were done as a function of pH, temperature, contact time, initial concentrations and adsorbent doses. Results indicated that the adsorption capacity of rice bran activated carbon for reactive brilliant blue KN-R were found to be 303.03 mg/g and 384.62 mg/g when pH was 2 and 12 respectively. With the increase of temperature, the adsorption equilibrium time would be shortened. The adsorption was well described by Langmuir model pseudo-second-order model was found to explain the kinetics of adsorption most effectively. The thermodynamics constants of adsorption process showed that the adsorption was endothermic and spontaneous.

关 键 词：稻壳活性炭 吸附 活性艳蓝KN-R 

分 类 号：X703.1[环境科学与工程—环境工程]