焦磷酸钾对铜污染土壤的淋洗修复

发布时间：2018-04-27 22:57

本文选题：焦磷酸钾 + 淋洗　；参考：《环境工程学报》2017年02期

【摘要】：焦磷酸钾是一种对农田土壤环境友好的物质。通过批处理振荡淋洗实验研究了所配制的焦磷酸钾淋洗液对模拟污染土壤中重金属铜的淋洗特性,探讨了淋洗时间、淋洗液pH和焦磷酸钾浓度对淋洗效果的影响,并讨论了土壤中铜在焦磷酸钾淋洗液作用下的解吸动力学和淋洗前后重金属形态变化特性。结果表明,淋洗时间越长、淋洗液浓度越大,淋洗效果越好。优化实验条件,淋洗浸提24 h、淋洗液pH为7.0、n(焦磷酸钾)∶n(铜)为7∶1,淋洗效果较好,铜淋洗率为40.51%。焦磷酸钾淋洗的铜主要以酸提取态和可还原态为主。焦磷酸钾淋洗液对土壤铜的浸提过程符合双常数方程,说明土壤中铜在焦磷酸钾淋洗液作用下的解吸是非均相扩散过程。
[Abstract]:Potassium pyrophosphate is a kind of friendly substance to farmland soil environment. The leaching characteristics of heavy metal copper in simulated contaminated soil were studied by batch treatment, and the effects of leaching time, pH of leaching solution and concentration of potassium pyrophosphate on the leaching effect were discussed. The desorption kinetics of copper in soil under the action of potassium pyrophosphate leaching solution and the speciation characteristics of heavy metals before and after leaching were discussed. The results showed that the longer the elution time, the greater the concentration of eluent and the better the elution effect was. The optimum conditions were as follows: leaching and leaching for 24 h, pH value of leaching solution was 7: 1 (potassium pyrophosphate: n) = 7: 1, the elution effect was better, the leaching rate of copper was 40.51. The copper eluted by potassium pyrophosphate mainly consists of acid extractable state and reducible state. The leaching process of soil copper by potassium pyrophosphate solution accords with the double constant equation, which indicates that the desorption of copper in soil under the action of potassium pyrophosphate leaching solution is a heterogeneous diffusion process.
【作者单位】：广东工业大学环境科学与工程学院;
【基金】：广东省自然科学基金资助项目(2015A030313483)
【分类号】：X53

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