摘要
为筛选重金属污染农田土壤砷的高效钝化剂,通过批处理试验,研究了玉米秸秆生物质炭(MBC)、花生壳生物质炭(PBC)、凹凸棒石(ATP)和羟基磷灰石(HAP)4种钝化剂对土壤砷吸附解吸的影响。结果表明:不同钝化剂均显著增加了土壤砷的吸附量和吸附率(P<0.05),且HAP>ATP>PCB>MBC>对照。土壤对砷的等温吸附曲线更符合Langmuir方程(P<0.01)。不同钝化剂均增加了土壤砷的最大吸附量和结合强度,最大吸附量顺序为:ATP>PBC>MBC>HAP>对照。吸附解吸试验表明,土壤对砷的吸附动力学行为更符合Elovich方程(P<0.01),且HAP和ATP对土壤砷的吸附效果较好,但HAP对土壤砷的解吸量较ATP高25.0%~86.3%,因此,从吸附解吸两方面综合考虑,ATP是土壤砷较好的钝化剂。
In order to screen out high efficiency passivating agent of arsenic(As)in soil contaminated by heavy metals,the effects of four passivating agents,maize straw biochar(MBC),peanut shell biochar(PBC),attapulgite(ATP)and hydroxyapatite(HAP),on adsorption and desorption of As in soil were investigated by the batch test.The results showed that passivators significantly increased the adsorption amount and adsorption rate of As in soil(P<0.05)with an order of HAP>ATP>PCB>MBC>CK.Langmuir equation was better for the isothermal sorption curve(P<0.01).The four passivators increased the maximum adsorption amount and binding strength of As in soil,and the maximum adsorption amount followed the order of ATP>PBC>MBC>HAP>CK.Adsorption-desorption test indicated the adsorption kinetic curves of As could be described well by the Elovich equation(P<0.01),and HAP and ATP had better adsorption effect,but the desorption amount of HAP was 25.0%-86.3%higher than that of ATP.Therefore,from the perspective of adsorption and desorption,ATP is a better passivating agent for As in soil.
作者
李仁英
全红
李绍通
刘雨霏
简静
李玉聪
芦文皓
段盛芹
普布次松
LI Renying;QUAN Hong;LI Shaotong;LIU Yufei;JIAN Jing;LI Yucong;LU Wenhao;DUAN Shengqin;Pubucisong(Jiangsu Provincial University Key Laboratory of Agricultural and Ecological Meteorology,School of Ecology and Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Ecosystem Carbon Source and Sink-China Meteorological Administration,School of Ecology and Applied Meteorology,Nanjing University of Information Science&Technology,Nanjing 210044,China)
出处
《土壤》
CSCD
北大核心
2024年第6期1319-1325,共7页
Soils
基金
江苏省林业科技创新与推广项目(LYKJ[2019]08)
江苏省研究生科研与实践创新计划项目资助。
关键词
砷
钝化剂
吸附
解吸
吸附动力学
Arsenic
Passivator
Adsorption
Desorption
Adsorption kinetics
