羟基磷灰石对铅锌矿区土壤吸附Zn~(2+)、Cd~(2+)的影响

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英文篇名：Effect of Hydroxyapatite on Adsorption of Zn~(2+)and Cd~(2+) in Lead-Zinc Mine Area Soils 作者：宋承远 ; 夏建国 ; 李琳佳 ; 李欣雨 ; 肖欣娟 英文作者：SONG Chengyuan;XIA Jianguo;LI Linjia;LI Xinyu;XIAO Xinjuan;College of Resources,Sichuan Agricultural University;The Office of Party Construction Hesheng Town,Wenjiang District; 关键词：Zn2+ ; Cd2+ ; 羟基磷灰石 ; 吸附 英文关键词：Zn2+;;Cd2+;;hydroxyl apatite;;adsorption 中文刊名：水土保持学报 英文刊名：Journal of Soil and Water Conservation 机构：四川农业大学资源学院;温江区和盛镇党建办; 出版日期：2019-08-15 出版单位：水土保持学报 年：2019 期：04 基金：四川省学术和技术带头人培养基金项目(2014);; 四川农业大学学科建设双支计划项目(2019) 语种：中文; 页：352-359 页数：8 CN：61-1362/TV ISSN：1009-2242 分类号：X53

摘要

为探究羟基磷灰石(HAP)对矿区土壤重金属的固化效果,采用吸附试验,研究施加HAP的铅锌矿区土壤对Cd~(2+)、Zn~(2+)的动力学吸附和等温吸附效果。结果表明:土壤对Cd~(2+)、Zn~(2+)的吸附量随Cd~(2+)、Zn~(2+)初始浓度的增加而增加;在酸性条件下,其吸附量随pH上升而上升;准二级动力学方程能很好地描述两者的吸附过程,土壤吸附能力随HAP的添加量增大而增强;在Zn—Cd共存体系中,当初始浓度为<20mg/L时,土壤对Zn~(2+)、Cd~(2+)的吸附无明显差异,2种金属离子竞争力度小,随着初始浓度上升,竞争明显,对Zn~(2+)的最大吸附量能达到单一体系中的79%～87%,而Cd~(2+)的最大吸附量只有单一体系中的57%～72%,Zn~(2+)的竞争力优于Cd~(2+),Zn~(2+)对Cd~(2+)吸附产生严重的抑制。综上可知,HAP能提高矿区土壤的吸附性能,在Zn、Cd污染土壤中,更能提升土壤对Zn~(2+)的吸附固持能力。
        To explore the effect of hydroxyapatite(HAP)on the solidification of heavy metals in mining areas,this study conducted the adsorption experiments to study the kinetic adsorption and isothermal adsorption of Cd~(2+)and Zn~(2+)in the soil of Pb-Zn mines with HAP.The results showed that the adsorption of Cd~(2+)and Zn~(2+)increased with the increase of initial concentrations of Cd~(2+)and Zn~(2+);under acidic conditions,the amount of adsorption i ncreased with the increasing pH values;the quasi-second-order kinetic equation could well describe the adsorption process of Zn~(2+)and Cd~(2+),soil adsorption capacities increased with the addition of HAP.In the Zn-Cd coexistence system,when the initial concentration was <20 mg/L,the adsorption of Zn~(2+)and Cd~(2+)in the soil was not significantly different.The competitiveness of the two metal ions was small,and the competition was obvious as the initial concentrations increased.The maximum adsorption capacities of Zn~(2+)reached 79% ～87% in a single system,while the maximum adsorption capacities of Cd~(2+)was only 57%～72%in a single system.The competitiveness of Zn~(2+)was better than that of Cd~(2+),and Zn~(2+)seriously inhibited the adsorption of Cd~(2+).In summary,HAP could improve the adsorption performance of soil in the mining area,and enhance the adsorption and retention ability of soil to Zn~(2+)in Zn and Cd contaminated soils.

引文

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