摘要
以天然钠基膨润土为原料并用改性聚丙烯酰胺对膨润土进行改性,制备了一种新型改性膨润土防渗材料。选用沈阳大辛填埋场的垃圾渗透液为处理对象,利用静态吸附实验对改性膨润土防渗材料吸附渗滤液的吸附机理进行了探讨。结果表明,改性膨润土对有机污染物的吸附性能效果明显好于膨润土原土,对含高浓度有机物的垃圾渗滤液的COD最大去除率可达30.73%;由等温吸附曲线可知,改性膨润土吸附过程可用Freundlich模型进行适宜地描述,等温吸附曲线方程为y=0.4211x-1.3787,r^2=0.9921;改性膨润土在静态吸附条件下,对COD的吸附去除作用以物理吸附为主。
A new type of polyacrylamide-modified impermeable bentonite material was prepared using poly- acrylamide and natural bentonite as raw material. With Shenyang Daxin landfill leachate as treatment ob- ject and a static adsorption test, the adsorption mechanism of the new type polyacrylamide modified ben- tonite for leachate was studied. The test results show that the adsorption efficiency of the modified benton- ite for organic pollutants is obviously better than that of the original bentonite. The maximum COD re- moval rate of leachate containing high concentrations of organic compounds could reach 30.73%. The iso- thermal adsorption curve shows that the adsorption process of modified bentonite for COD can be described appropriately with Freundlich model. The equation of the isothermal adsorption curve is y=0. 4211x- 1. 3787, r2 =0. 9921 and the static adsorption of modified bentonite for COD is mainly physical adsorption.
出处
《化学世界》
CAS
CSCD
北大核心
2013年第9期528-532,共5页
Chemical World
基金
国家科技重大水专项子课题(2012ZX07505-002)
辽宁省博士启动基金(20121072)资助项目
辽宁省教育厅基金(L201106)资助项目
