固体废弃物材料的改性及对重金属修复实验
Modification of solid waste materials and repair test of heavy metals
季晓莲 1李松2
作者信息
- 1. 杨凌职业技术学院,陕西杨凌 712100
- 2. 陕西垚森园林景观有限公司,陕西杨凌 712100
- 折叠
摘要
为合理利用废弃物资源,降低土壤重金属潜在的风险,以玉米秸秆固体废弃物为原料,制备一种玉米秸秆生物炭材料,并利用壳聚糖对其进行改性,研究改性玉米秸秆生物炭材料性能及其对上壤重金属的修复效果.实验结果表明,(1)改性生物炭材料的pH值为8.39,电导率为28.26μS·cm-1,比表面积为2.23m2·g-1,孔径为8.75nm;(2)改性生物炭材料可以增大土壤碱度和电导率,修复后上壤pH值为7.83,土壤电导率为2.25mS·cm-1;(3)改性生物炭材料对土壤重金属修复效果较好,可减少土壤中水溶态和碳酸盐结合态重金属铅、镉的含量,使土壤中重金属铅、镉更多的以残余态存在.可见,这种壳聚糖改性玉米秸秆生物炭材料对土壤中重金属铅、镉有着良好吸附和钝化效果,修复效果较好.
Abstract
In order to make rational use of waste resources and reduce the potential risks of heavy metals in soil,a corn straw biochar material is prepared with corn straw solid waste as raw material,and chitosan is used to study the properties of modified corn straw biochar material and its repair effect on heavy metals in soil.The test results show that(1)the pH value of modified biochar material is 8.39,electrical conductivity is 28.26µS·cm-1,specific surface area is 2.23m2·g-1,pore diameter is 8.75nm;(2)modified biochar material can increase soil alkalinity and conductivity,soil pH value is 7.83,soil conductivity is 2.25mS·cm-1;(3)modified biochar material has good effect on soil heavy metals in soil,and heavy metals lead and cadmium in soil.In conclusion,this chitosan-modified com straw biochar material has a good adsorption and passivation effect on the heavy metals lead and cadmium in the soil,and has a good repair effect.
关键词
生物炭/壳聚糖/重金属/电导率/碳酸盐结合态Key words
biochar/chitosan/heavy metals/conductivity/carbonate bound state引用本文复制引用
出版年
2024
NETL
NSTL
万方数据