设为首页  |   加入收藏
引用本文:
【打印本页】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 86次   下载 40 本文二维码信息
码上扫一扫!
分享到: 微信 更多
不同质地土壤对镉的吸附特性及影响因子研究
孙庆超, 王旭东, 乔建晨, 李玉龙, 赵陈晨, 高 超, 梁淑轩, 刘 微
河北大学化学与环境科学学院
摘要:
通过Cd2+ 吸附解吸试验,探究了初始Cd2+浓度、pH、有机质、土壤质地和枯草芽孢杆菌-生物质炭复合体对土壤吸附Cd2+ 影响。结果表明:土壤对Cd2+ 的吸附能力随着溶液浓度、pH的升高而增加,土壤有机质可显著提高土壤对Cd2+ 的固定能力,壤土对Cd2+ 的吸附能力显著高于砂质壤土。土壤施加枯草芽孢杆菌-生物质炭复合体后,土壤对于Cd2+ 的吸附能力显著提高,并且施加枯草芽孢杆菌-生物质炭复合体为20 ml/kg时对Cd2+ 的吸附量提高11.7%;Freundlich模型(R2=0.997)可以很好地拟合 Cd2+ 吸附过程。枯草芽孢杆菌-生物质炭复合体的施加降低了土壤表面Cd2+ 的解吸能力,进一步证明复合体能加强土壤对Cd2+ 的固定稳定化,具有作为钝化剂修复土壤重金属污染、降低食品污染风险的潜力。
关键词:  枯草芽孢杆菌–生物质炭复合体  镉离子  吸附  解吸
DOI:10.13758/j.cnki.tr.2020.03.018
分类号:X53
基金项目:河北省自然科学基金项目(D2016201102)和河北省现代农业产业技术体系蔬菜产业创新团队项目(HBCT2018030206)资助。
Study on Cd Adsorption Characteristics and Influencing Factors of Soils with Different Textures
SUN Qingchao, WANG Xudong, QIAO Jianchen, LI Yulong, ZHAO Chenchen, GAO Chao, LIANG Shuxuan, LIU Wei
College of Chemistry & Environmental Science, Hebei University
Abstract:
The effects of the initial Cd2+ concentration, soil pH, organic matter, texture and Bacillus subtilis-biochar complex on the Cd2+ adsorption in soils were studied by adsorption and desorption experiments. The results showed that the adsorption capacity of soil for Cd2+ increased with the increase of Cd2+ initial concentration and pH. Organic matter significantly promoted the immobilization of Cd2+ in soil. The adsorption capacity of loam for Cd2+ was significantly higher than that of sandy loam. After applied Bacillus subtilis-biochar immobilized complex, the adsorption capacity of soil for Cd2+ was significantly higher than that of the control group, and the maximum increase was 11.7% when applied 20 ml/kg of Bacillus subtilis-biochar immobilized complex. The Freundlich model could well fit the adsorption process of Cd2+ (R2=0.997). The desorption rate of Cd2+ in soil after applied Bacillus subtilis-biochar immobilized complex was lower than that of the control group. In conclusion, the application of Bacillus subtilis-biochar immobilized complex in soil can effectively fix Cd and has a great potential as a passivating agent to repair soil polluted by heavy metals and ensure the safety of food and vegetables.
Key words:  Bacillus subtilis-biochar immobilized complex  Cadmium  Adsorption  Desorption

您是第3178295位访问者
版权所有 © 《土壤》编辑部
本系统由北京勤云科技发展有限公司设计   京ICP备09084417号