再力花残体活性炭的制备及对结晶紫的吸附  

Active carbon from Thalia dealbata residues: Its preparation and adsorption performance to crystal violet

作　　者：褚淑祎[1,2] 杨敏[2] 肖继波[2] 张骏[2] 朱燕萍[2] 严向军[3] 田光明[1] 

机构地区：[1]浙江大学环境与资源学院,杭州310058 [2]浙江农林大学环境与资源学院,浙江临安311300 [3]杭州市市区河道监管中心,杭州310008

出　　处：《应用生态学报》2013年第6期1693-1698,共6页Chinese Journal of Applied Ecology

基　　金：国家水体污染控制与治理重大科技专项(2008ZX07101-006-08);浙江省重大科技专项(2009C03006-3);温州市招投标项目(FGB201106130119;Z100602217);浙江省大学生科技创新项目(2012R412020)资助

摘　　要：以多年生水生植物再力花残体为原料,磷酸为活化剂制备活性炭,其BET比表面积达1174.13m2·g-1,微孔面积为426.99m2·g-1,平均孔径为3.23nm.考察了不同pH、结晶紫初始浓度、吸附时间和吸附温度下,活性炭对结晶紫的吸附性能.结果表明:吸附量基本不随pH变化;吸附过程主要分为快速吸附和慢速吸附2个阶段,符合伪二级动力学方程;在温度为293、303、313K条件下,吸附过程更符合Langmuir等温吸附方程,最大吸附量分别为409.83、425.53和438.59mg·g-1,且吸附是一个熵增的自发吸热过程.By using phosphoric acid as activation agent, active carbon was prepared from Thalia dealbata residues. The BET specific surface area of the active carbon was 1174.13 m2·g-1, micropore area was 426.99 m2·g-1, and average pore diameter was 3.23 nm. An investigation was made on the adsorption performances of the active carbon for crystal violet from aqueous solution under various conditions of pH, initial concentration of crystal violet, contact time, and contact temperature. It was shown that the adsorbed amount of crystal violet was less affected by solution pH, and the adsorption process could be divided into two stages, i.e., fast adsorption and slow adsorption, which followed the pseudo-second-order kinetics model. At the temperature 293, 303, and 313 K, the adsorption process was more accordance with Langmuir isotherm model, and the maximum adsorption capacity was 409.83, 425.53, and 438.59 mg·g-1, respectively. In addition, the adsorption process was spontaneous and endothermic, and the randomness of crystal violet molecules increased.

关 键 词：再力花残体 结晶紫 吸附等温线 动力学 热力学 

分 类 号：X705[环境科学与工程—环境工程]