柠檬酸协同复配强化对锑的淋洗修复  

Synergistic Compounding of Citric Acid to Strengthen Antimony Leaching

作　　者：诸毅 ZHU Yi(Shanghai Chengtou Environmental Ecological Remediation Technology Co.,Ltd.,Shanghai 200030,China;Shanghai Environmental Ecological Remediation Technology Co.,Ltd.,Shanghai 200030,China)

机构地区：[1]上海城投上境生态修复科技有限公司,上海200230 [2]上海环境绿色生态修复科技有限公司,上海200030

出　　处：《化工管理》2022年第16期70-73,共4页Chemical Engineering Management

摘　　要：重金属是土壤的主要污染物,相比其他的重金属污染物,锑受到的关注一直较少,相关的研究也不多。本研究以上海地区锑的黏性污染土为研究对象,寻找能够有效去除锑的淋洗方法。以绿色淋洗剂为出发点,文章首先讨论了柠檬酸对锑的淋洗情况,在最优的浓度情况下,加入其他药剂进行复配淋洗,EDTA、CaCl_(2)、FeCl_(3)、醋酸钠与柠檬酸的复配对锑的淋洗具有拮抗作用,KH_(2)PO_(4)、草酸与柠檬酸的复配对锑的淋洗具有协同作用,0.2 mol/L KH_(2)PO_(4)、0.2 mol/L草酸、0.05 mol/L柠檬酸的复配溶液在液固比为4 mL/g时淋洗2 h,锑的去除率最高,为44%。Heavy metal pollution is the heaviest pollution of soil.Less attention was paid to antimony compared with other heavy metals,leading to the lack of related researches.Based on clay soil of antimony in Shanghai,this paper tried to f ind out an effective method to leach out this pollutant in soil.For environmental protection,citric acid was the f irst one to take experiments and the optimal concentration was decided.Citric acid of optimal concentration combined with other chemicals were tried for compound leaching experiments.Results showed that the combination of EDTA,CaCl_(2),FeCl_(3),NaOAc and citric acid had an antagonistic effect on the leaching of antimony while KH_(2)PO_(4),oxalic acid and citric acid had a synergistic effect.The antimony removal rate was the highest of 44%when the compound solution of 0.2 mol/L KH_(2)PO_(4),0.1 mol/L oxalic acid,0.05 mol/L citric acid were leached for 2 h with the liquid to solid ratio was 4 mL/g.

关 键 词：锑 黏土 柠檬酸 复配淋洗 协同作用 

分 类 号：X53[环境科学与工程—环境工程]