深圳大学学报（理工版）2025，Vol.42Issue(2)：138-145,8.DOI:10.3724/SP.J.1249.2025.02138
典型煤矸石基分子筛修复镉污染土壤的生态风险
Ecological risk of typical coal gangue-based molecular sieves in cadmium-contaminated soil remediation
摘要
Abstract
To investigate the application of using typical gangue-based molecular sieves as stabilizers for the remediation of soil contaminated with heavy metal cadmium(Cd),we used high iron content X-type molecular sieves(Fe-NaX)and amino-modified X-type gangue-based molecular sieves(NH2-NaX)as stabilizers,and simulated the conditions of acid rain by using a leaching solution with an initial pH value of 5.0 conducted column leaching experiments on the soil containing heavy metal Cd to study the release behavior and migration/diffusion patterns of Cd in the soil.The results showed that after adding Fe-NaX and NH2-NaX molecular sieves,the pH,electrical conductivity(EC)and Cd concentration in the leachate initially increased rapid,then slowly decreased and stabilized.As the number of leaching cycles increased,the cumulative amount of Cd leached generally exhibited an overall upward trend,characterized by a rapid increase in the initial phase,followed by a slower rise.The parabolic equation,Elovich modified equation and Freundlich modified equation were used to fit the cumulative release of Cd.The correlation coefficients(R2)for all these models were greater than 0.98,indicating a good fit.Compared with the control group,the exchangeable Cd content in the leachate decreased with addition of stabilizers as some Cd was converted into stable residual forms of Cd.This result indicates that both Fe-NaX and NH2-NaX type molecular sieves can effectively inhibit the leaching of heavy metal Cd from soil under acid rain conditions,thereby reducing its ecological risk.This study not only reveals the potential value of typical gangue-based molecular sieves as stabilizers for remediation of contaminated soil under acid rain conditions,but also provides a scientific basis for their wide application in the treatment of heavy metal-contaminated soils.关键词
修复材料/土壤修复/典型煤矸石基分子筛/镉污染/酸雨/生态风险/柱状淋溶Key words
remediation materials/soil remediation/typical gangue-based molecular sieves/cadmium contamination/acid rain/ecological risk/columnar leaching分类
矿山工程引用本文复制引用
洪程,叶秋月,刘谦,皇甫卓曦,余江..典型煤矸石基分子筛修复镉污染土壤的生态风险[J].深圳大学学报（理工版）,2025,42(2):138-145,8.基金项目
Special Project of Sichuan Bureau of Geology&Mineral Resources(SCDZ-DH202404) 四川省地质局专项资助项目(SCDZ-DH202404) （SCDZ-DH202404）
