β-环糊精壳聚糖改性生物炭固化稳定化土壤中镉铬
SOLIDIFICATION/STABILZATION OF Cd AND Cr IN SOIL USING BIOCHAR MODIFIED BY β-CYCLODEXTRIN CHITOSAN (β-CC BC)
-
摘要: 镉(Cd)和铬(Cr)是在土壤中普遍存在的重金属污染物,固化稳定化作为一种处理土壤中金属污染的方法,具有快速、经济、有效等特点。本实验以稻壳生物炭(BC)为原材料,利用β-环糊精壳聚糖(β-CC)对其进行改性,形成一种环保廉价且能有效去除土壤中重金属离子的有机复合吸附材料β-环糊精壳聚糖生物炭(β-CC BC),与硅酸盐水泥复配后固化稳定化土壤中的Cd、Cr。利用控制单因素变量对改性生物炭的处理效果进行探究,结果表明:在β-CC BC添加量为10%左右、养护时间21d时,Cd、Cr浸出浓度最低。与磷酸钾(K3PO4)、碳酸钙(CaCO3)、硅酸钠(Na2O·nSiO2)和硫酸钠(Na2SO4)四种材料相比,β-CC BC对Cr和Cd的处理效果都处于较优水平。该研究成果为长效同时固化稳定化Cd和Cr污染土壤提供了新的技术方案。Abstract: Cadmium (Cd) and Chromium (Cr) are widespread heavy metal pollutants in soil. As a method to treat metal pollution in soil, solidification / stabilization has the characteristics of rapid, economic and effective. This experiment by rice husk biochar (BC) as raw material, using the beta cyclodextrin chitosan (β-CC) on the modification, formed a kind of cheap and environmental protection can effectively remove heavy metal ions in soil organic compound adsorption material beta cyclodextrin chitosan biochar (β-CC BC), after curing with Portland cement stabilizing Cd and Cr in the soil. The treatment effect of modified biochar was investigated by controlling single factor variable. The results showed that the leaching concentration of Cd and Cr was the lowest when β-CC BC was added about 10% and curing time was 21 days. Compared with potassium phosphate (K3PO4), calcium carbonate (CaCO3), sodium silicate (Na2O·nSiO2) and sodium sulfate (Na2SO4), β-CC BC has better treatment effect on Cr and Cd. This study provides a new technical scheme for long-term simultaneous solidification and stabilization of Cd and Cr contaminated soil.
点击查看大图
计量
- 文章访问数: 156
- HTML全文浏览量: 37
- PDF下载量: 11
- 被引次数: 0