摘要
本文用壳聚糖和聚二甲基二烯丙基氯化铵(PDMDAAC)作为改性剂,对钠基膨润土进行改性,制得两种改性膨润土.通过实验研究了其吸附的机理,并根据范德霍夫方程计算了吸附过程中的热力学参数.实验结果表明:两种改性膨润土对含油废水的吸附过程较好的符合准二级动力学模型和Freundlich吸附等温线模型;在吸附过程中,既有物理吸附,也有化学吸附.当温度小于10℃时,以物理吸附为主,当温度大于10℃时,以化学吸附为主.
In this paper, Chitosan and PDMDAAC were employed to modify Na-bentonite and the adsorption behaviors of two kinds of modified bentonite on oil pollutants were systematically studied. Thermodynamic parameters were calculated based on Van＇t Hoff equation. The study results indicated that the adsorption processes were well following pseudo-second order rate equation, the adsorption isotherms were in accord with the Freundlich isotherm model. Both physical and chemical adsorption existed. The physical adsorption is dominant at temperature below 10℃while the chemical adsorption is dominant at temperature over 10 ℃.
出处
《环境科学学报》
CAS
CSCD
北大核心
2015年第7期2114-2120,共7页
Acta Scientiae Circumstantiae
基金
国家水体污染控制与治理科技重大专项(No.2011ZX07530-02)~~
关键词
改性膨润土
石油类污染物
动力学
热力学
温度
吸附机理
modified bentonite
oil pollution
absorption kinetics
absorption thermodynamics
temperature
adsorption mechanism
