Sapindus Modified Diatomite Combined with Different Materials to Passivate Heavy Metal Pb and Cd Polluted Soil
To study the remediation effect of sapindus soap liquid modification and combination of passivating agents on Pb and Cd contamina-ted soil,a polluted soil in Fujian was selected as the research object,the application test method was used to study the influence of modified di-atomite 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 passivat-ors,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 pas-sivating 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 Pb2+and Cd2+was mainly single-layer adsorption;the adsorption of Pb2+and Cd2+by LSYT-G+activated carbon and LSYT-G+phosphorus slag composite materials was mainly a multi-layer adsorption process on heterogeneous surfaces.
万方数据
维普
