| 硫化物与铁系还原剂还原土壤重金属Cr(VI)的 成效及影响因素研究 |
| |
| 引用本文： | 丁辉,郑刘根. 硫化物与铁系还原剂还原土壤重金属Cr(VI)的 成效及影响因素研究[J]. 安徽农业大学学报, 2024, 51(2): 338 |
| |
| 作者姓名： | 丁辉 郑刘根 |
| |
| 作者单位： | 1. 安徽大学资源与环境工程学院，合肥 230601；2. 安徽省矿山生态修复工程实验室，合肥 230601 |
| |
| 基金项目： | 安徽高校协同创新项目(GXXT-2021-017), 国家自然科学基金项目(42072201)和淮北矿业股份有限公司科技攻关项目(2022-08)共同资助。 |
| |
| 摘 要： | 为了探究不同化学还原剂对淮南市新庄孜矿区土壤重金属Cr(Ⅵ)的去除效率的影响，构建土壤、还原剂、投加比例和pH值的正交试验，模拟土壤在不同的pH值以及其他因素影响下，Cr(Ⅵ)的去除率变化情况及土壤水溶液的稳定性情况，同时探究最佳还原剂投入比值。研究结果表明：待修复土壤中铬含量超出了规定第一类，第二类建设用地为用途的铬含量的4.065和1.560倍。土壤水溶液比值在1∶5时候，Cr(Ⅵ)的浸出率最高。还原剂FeCl2·4H2O与Na2S·9H2O的组合较其他还原剂取得更优异的还原Cr(Ⅵ)的效果，还原剂FeCl2·4H2O与Na2S·9H2O反应生成FeS是其取得优异还原效果的原因。还原剂FeCl2·4H2O与Na2S·9H2O联用比值为1∶1.5时，Cr(Ⅵ)的去除率达到最佳效果。催化剂过氧化氢溶液和二氧化锰的加入也进一步提高了Cr(Ⅵ)去除率。联用还原剂四水氯化亚铁和九水硫化钠修复后的土壤水溶液pH值呈中性，避免了对土壤酸碱度的破坏。综上所述，还原剂FeCl2·4H2O与Na2S·9H2O的联用对土壤重金属Cr(Ⅵ)的去除效果显著，催化剂的加入进一步提高了Cr(Ⅵ)的去除率，联用还原剂中和了土壤水溶液的pH值。
|
| 关 键 词： | 九水硫化钠；四水氯化亚铁；化学还原；土壤修复；六价铬 |
| 收稿时间： | 2023-03-15 |
Study on the effects and influencing factors of reducing heavy metal Cr(VI) in soil by sulfides and iron reductants |
| |
| DING Hui,ZHENG Liugen. Study on the effects and influencing factors of reducing heavy metal Cr(VI) in soil by sulfides and iron reductants[J]. Journal of Anhui Agricultural University, 2024, 51(2): 338 |
| |
| Authors: | DING Hui ZHENG Liugen |
| |
| Affiliation: | 1. School of Resources and Environmental Engineering, Anhui University, Hefei 230601；2. Anhui Province Mining Ecological Restoration Engineering Laboratory, Hefei 230601 |
| |
| Abstract: | In order to investigate the effects of different chemical reducing agents on the removal efficiency of heavy metal Cr(Ⅵ) in soil of Xinzhuangzi mining area, Huainan City, China, a orthogonal experiment of soil, reducing agent, dosage ratio and pH value was constructed, simulating the soil with different pH values and other factors, the change of chemical reduction, soil remediation removal rate and the stability of soil aqueous solution, and at the same time, to explore the optimal reducing agent input ratio. The results showed that the chromium content in the soil to be repaired was 4.065 and 1.560 times of that in the first and second type construction land. The highest leaching rate of Cr(Ⅵ) was observed when the ratio of aqueous solution was 1∶5. The combination of reducing agent FeCl2·4H2O and Na2S·9H2O had better reducing effect on Cr(Ⅵ) than other reducing agents. The reaction of reducing agent FeCl2·4H2O with Na2S·9H2O to produce FeS was the reason for its excellent reduction effect. When the ratio of reducing agent FeCl2·4H2O to Na2S·9H2O was 1∶1.5, the removal rate of Cr(Ⅵ) reached the best effect. The addition of catalyst hydrogen peroxide solution and manganese dioxide further increased the removal rate of chemical reduction and soil remediation. The pH value of the soil aqueous solution repaired by reducing agents ferrous chloride tetrahydrate and sodium sulfide nine-water was neutral, which avoided |
| |
| Keywords: | sodium sulfide nine-water ferrous chloride tetrahydrate chemical reduction soil remediation hexavalent chromium |
|
| 点击此处可从《安徽农业大学学报》浏览原始摘要信息 |
|
点击此处可从《安徽农业大学学报》下载免费的PDF全文 |
