无患子协同改性硅藻土与不同材料配施钝化铅镉污染土壤  

Sapindus Modified Diatomite Combined with Different Materials to Passivate Heavy Metal Pb and Cd Polluted Soil

作　　者：何苏祺 罗兰花 朱禹臻 李正 HE Su-qi;LUO Lan-hua;ZHU Yu-zhen(Fujian Longjing Environmental Protection Co.,Ltd.,Longyan,Fujian 364000)

机构地区：[1]福建龙净环保股份有限公司,福建龙岩364000

出　　处：《安徽农业科学》2024年第18期37-42,共6页Journal of Anhui Agricultural Sciences

基　　金：福建龙净环保股份有限公司项目(201906);福建省科技计划项目(2021T3006)。

摘　　要：为研究无患子皂液改性及组配钝化剂对镉铅污染土壤修复效果,以福建某污染土壤为研究对象,研究改性硅藻土与不同材料对土壤有效态含量的影响。结果表明:无患子皂液与硫酸亚铁协同改性后的硅藻土钝化效果优于单一硅藻土。3种复配钝化剂中,LSYT-G+氧化钙在配比为7∶3时对污染土壤中有效态Pb、Cd的整体钝化效果更优,其有效态Pb、Cd分别下降45.86%、58.86%;pH较对照提升了2.68,表现出了较好的修复效果。Langmuir和Freundlich等温吸附模型模拟发现,LSYT-G+氧化钙对Pb^(2+)、Cd^(2+)的吸附过程主要为单分子层吸附;LSYT-G+活性炭、LSYT-G+磷矿渣复合材料对Pb^(2+)、Cd^(2+)吸附主要为在非均相表面的多层吸附过程。To study the remediation effect of sapindus soap liquid modification and combination of passivating agents on Pb and Cd contaminated soil,a polluted soil in Fujian was selected as the research object,the application test method was used to study the influence of modified diatomite and different materials on the change of soil available state content.The results showed that the passivation effect of diatomite after the synergistic modification of sapindus soap liquid and ferrous sulfate was better than that of single diatomite.Among the three compound passivators,when the ratio of LSYT-G+CaO was 7∶3,the overall passivation effect on the effective Pb and Cd in the contaminated soil was better,the effective states of Pb and Cd decreased by 45.86%and 58.86%,respectively,and the pH increased by 2.68 compared with the control.The passivating agent showed a good repairing effect.According to the fitting results of Langmuir and Freundlich isotherm adsorption models,it was found that the adsorption process of LSYT-G+CaO on Pb^(2+)and Cd^(2+)was mainly single-layer adsorption;the adsorption of Pb^(2+)and Cd^(2+)by LSYT-G+activated carbon and LSYT-G+phosphorus slag composite materials was mainly a multi-layer adsorption process on heterogeneous surfaces.

关 键 词：土壤修复 钝化剂 无患子 改性硅藻土 

分 类 号：X53[环境科学与工程—环境工程]