首页|天然矿物修复剂筛选及其对镉固持性能研究

天然矿物修复剂筛选及其对镉固持性能研究

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对湖南省14个产地、4类矿物材料的镉固持性能进行对比,优选出4种天然高效镉修复材料(宁乡县喻家坳的石灰石、湘潭县楠木冲的低品位锰矿石、桃源县马宗岭的膨润土和石门县新岗的海泡石).4种天然矿物材料对镉的固持动力学速率从快到慢排序为:膨润土＞石灰石＞海泡石＞锰矿石.各矿物材料对镉的吸附量随着镉初始质量浓度增大而增大,镉质量浓度不高于10.0 mg/L时,各矿物材料对镉的吸附量从大到小排序为:石灰石＞膨润土＞锰矿石＞海泡石;镉质量浓度高于10.0 mg/L时,各矿物材料对镉的吸附量从大到小排序为:膨润土＞石灰石＞锰矿石＞海泡石.吸附行为均符合Langmuir吸附模型,膨润土、石灰石、锰矿石、海泡石对镉的最大吸附容量分别为29.38、14.51、9.67、5.27 mg/g.溶液pH=6～9时,各矿物材料对镉的去除效率排序为:石灰石＞膨润土＞锰矿石＞海泡石.天然矿物材料对镉的固持效果与矿物的化学组分、初始镉质量浓度、pH值有关.
Selection of Natural Minerals as Remediation Agents Based on Cadmium Immobilization
Based on comparison of cadmium immobilization with 4 types of minerals originated from 14 places in Hunan Province,four kinds of natural and efficient remediation materials(including limestone from Yujiaao of Ningxiang County,low-grade manganese ore from Nanmuchong of Xiangtan County,bentonite from Mazongling of Taoyuan County,and sepiolite from Xingang of Shimen County)were selected.The kinetic rate of cadmium immobilization by these four natural minerals is in the following descending order:bentonite＞limestone＞sepiolite＞manganese ore.The cadmium adsorption by four kinds of minerals increases as the initial cadmium mass concentration increases.With cadmium mass concentration no higher than 10.0 mg/L,the cadmium adsorption by these four minerals is in the following descending order:limestone＞bentonite＞manganese ore＞sepiolite;with cadmium mass concentration exceeding 10.0 mg/L,the cadmium adsorption by these four minerals is in the following descending order:bentonite＞limestone＞manganese ore＞sepiolite.The adsorption behavior follows Langmuir adsorption model,and the maximum adsorption capacities of bentonite,limestone,manganese ore and sepiolite are 29.38 mg/g,14.51 mg/g,9.67 mg/g and 5.27 mg/g respectively.With pH of solution within the range of 6 to 9,the removal efficiency of cadmium by four minerals is in the following descending order:limestone＞bentonite＞manganese ore＞sepiolite.It is concluded that the cadmium immobilization with natural minerals is related to chemical composition of minerals,initial cadmium mass concentration,and pH value.

heavy metal pollutionadsorbentcontaminated soilsoil restorationcadmiumnatural mineralremediation agentadsorption performanceimmobilizationmineral material

宋冰冰、邓武军、曾婧滢、毕军平、何海军、于磊、朱瑞瑞、张建新、吕焕哲、秦迪岚

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湖南省生态环境监测中心,湖南长沙 410019

国家环境保护重金属污染监测重点实验室,湖南长沙 410019

湖南省国际工程咨询中心有限公司,湖南长沙 410016

长沙环境保护职业技术学院,湖南长沙 410004

湖南省国土资源规划院,湖南长沙 410007

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重金属污染 吸附剂 污染土壤 土壤修复 镉 天然矿物 修复剂 吸附性能 固持性能 矿物材料

原国土资源部公益性行业科研专项湖南省重点研发计划国家环境保护重金属污染监测重点实验室开放基金

201111016-12021NK2027

2024

10.3969/j.issn.0253-6099.2024.04.047

矿冶工程
长沙矿冶研究院有限责任公司 中国金属学会

矿冶工程

CSTPCD北大核心
影响因子：1.137
ISSN：0253-6099
年,卷(期)：2024.44(4)