汤迪勇,向琦,雷炜东,孙杰.有机酸对污染土壤中重金属镉、铬、锰解吸效果的影响研究[J].中南民族大学学报自然科学版,2022,41(1):44-50
有机酸对污染土壤中重金属镉、铬、锰解吸效果的影响研究
Effects of organic acids on the desorption of Cd, Cr and Mn ions in heavy metal contaminated soil
  
DOI:10.12130/znmdzk.20220108
中文关键词: 土壤污染  重金属  有机酸  吸附解吸
英文关键词: soil contamination  heavy metal  organic acids  adsorption and desorption
基金项目:中央高校基本科研业务费专项资金资助项目(YCZW15125)
作者单位
汤迪勇 中南民族大学 资源与环境学院武汉430074 
向琦 中南民族大学 资源与环境学院武汉430074 
雷炜东 中南民族大学 资源与环境学院武汉430074 
孙杰 中南民族大学 资源与环境学院武汉430074 
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中文摘要:
      以生物可降解的低分子有机酸为污染土壤的重金属修复淋洗液,研究了有机酸种类、离子强度、pH等因素对Cd、Cr、Mn的吸附解吸影响规律. 结果表明:离子强度的增加及pH的减小均有利于重金属的解吸;柠檬酸、酒石酸和草酸对土壤中的Cd、Cr、Mn均表现出较高的解吸率,且有机酸浓度的提高有利于重金属解吸率的提升;土壤pH环境通过改变有机酸的电离形式而显著影响重金属的解吸效果,且柠檬酸对重金属的解吸能力高于酒石酸;在Cd、Cr、Mn共存的复合污染体系中,3种重金属之间存在着竞争吸附,其中Cd的解吸被抑制,而Cr、Mn的解吸率得到了提升.最佳条件下,20 mmol/L的柠檬酸对Cd、Cr、Mn的解吸率分别可达到75.44%、79.02%和87.76%.此外,有机酸在弱酸性环境下即可实现良好的重金属解吸效果,说明此修复技术具有广阔的应用前景.
英文摘要:
      In this paper, biodegradable low molecular weight organic acids were applied as eluents for heavy metal remediation in contaminated soil,and the effects of the organic acids, ionic strength and pH values on the adsorption and desorption of Cd, Cr and Mn were investigated. The results showed that the increase of ionic strength and decrease of pH could promote the desorption of heavy metals. Citric acid, tartaric acid and oxalic acid exhibited high desorption rates for Cd, Cr and Mn, and the increase of acid concentration was conducive to the desorption of heavy metal . The pH value of soil also significantly affected the desorption rate of heavy metals through mediation of the ionization of organic acids, and the desorption capacity of opon citric acid was appreciably higher than that of tartaric acid. In the soil polluted with coexistence of Cd, Cr and Mn, competitive adsorption among these heavy metals occurred, of which desorption of Cd was suppressed, while desorption of Cr and Mn were enhanced. Under the optimal conditions, the desorption rates of Cd, Cr and Mn in the presence of 20 mmol?L-1 citric acid achieved 75.44%, 79.02% and 87.76%, respectively. In addition, organic acids could realize high desorption rate of heavy metals in a mild acidic environment, indicating the approach proposed in this study may be a promising way for remediation of heavy mental contaminated soil.
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