3种生物质炭对活性艳蓝KN-R的吸附  

Adsorption of reactive brilliant blue KN-R by three kinds of biochars

作　　者：张平[1] 廖柏寒[1] 李科林[1] 仇银燕[1] 

机构地区：[1]中南林业科技大学环境科学与工程研究所,长沙410004

出　　处：《环境工程学报》2014年第2期581-586,共6页Chinese Journal of Environmental Engineering

基　　金：环保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);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：选择由玉米秸秆、稻壳和稻草秸秆在825℃制成的生物质炭作为吸附剂,通过模拟实验,研究其对溶液中活性艳蓝KN-R的吸附特性,考察了pH值、时间、溶液初始浓度和生物质炭用量对吸附效果的影响。结果表明,当pH为2.0时,玉米秸秆炭和稻壳炭对活性艳蓝的吸附量均达到最大,而pH对稻草秸秆炭的影响不大;三者达到吸附平衡的时间分别为180、300和360 min,最大吸附量分别为114.05、54.60和68.19 mg/g。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。Corn straw, rice husk and rice straw were selected to manufacture biochars as adsorbents at 825℃. Through simulation experiments, adsorption characteristics of biochars to reactive brilliant blue KN-R were studied, and effects of pH values, contact times, initial concentrations and biochars doses on the adsorp- tions were investigated. The results indicated that the adsorption capabilities were found to be maximum when pH was 2.0 for corn straw biochar and rice husk biochar, while pH had little effect for the rice straw biochar. The adsorption equilibrium times were 180, 300 and 360 min, respectively, and maximal adsorption capacities were 114.05, 54.60 and 68.19 mg/g,respectively. The adsorptions could be described by Langmuir models. Kinetic experiments showed that pseudo-secong-order models could explain the kinetics of adsorption process more effec- tively; thermodynamic data analysis showed that the adsorption process was endothermic and soontaneous.

关 键 词：玉米秸秆炭 稻壳炭 稻草秸秆炭 吸附 活性艳蓝KN—R 

分 类 号：X703[环境科学与工程—环境工程]