农业工程学报2024，Vol.40Issue(4)：245-253,9.DOI:10.11975/j.issn.1002-6819.202311018
球黏土对单及多组分重金属离子的吸附效果
Adsorption characteristics of ball clay for mono and multi-component heavy metal ions
摘要
Abstract
Heavy-metal-contaminated water has posed a serious risk to health and survival in recent years.It is urgent to prevent and treat heavy metal water pollution.Adsorption can be an economically feasible and environmentally friendly way for the removal of heavy metal ions from water.Clay minerals can be directly used for natural adsorption,due to their high adsorption properties.Among them,ball clay is characterized by fine particles,high content of disordered kaolinite,and high activity,indicating high potential adsorption.However,it is still lacking in the adsorption performance at present.This study aims to investigate the adsorption properties and competitive adsorption relationship of ball clay for Pb2+,Cu2+,Zn2+,Cd2+,and Cr6+.Batch adsorption tests were performed on the mono and multi-heavy metal ions.The mono-component heavy ion adsorption tests showed that the adsorption capacity of ball clay for the heavy metal ions followed a pattern of rapid increase followed by slow increase with the increase of pH value and the initial concentration,and finally reaching adsorption saturation.The optimal duration of adsorption equilibrium was 90 min,and the optimal solution pH value was 5.The influence level of pH value on the adsorption was ranked in the descending order of Zn2+,Cd2+,Cr6+,Cu2+,Pb2+.The adsorption capacity for Zn2+(the most influential ion)increased by 184%when pH value varied from 2 to 5.The weights of saturated adsorption for the five ions Pb2+,Cr6+,Cd2+,Zn2+,and Cu2+ were 311.847,301.437,263.213,195.435 and 179.635 mg/g,respectively.The kinetic and isotherm models displayed that the adsorption data was more consistent with the pseudo-second-order kinetic and Langmuir isothermal adsorption models,indicating the single-layer and chemical adsorption.The maximum adsorption was ranked in the order of the Pb2+(497.593 mg/g)>Cr6+(442.868 mg/g)>Cd2+(339.376 mg/g)>Zn2+(290.039 mg/g)>Cu2+(194.941 mg/g).Multi-component adsorption tests showed that the adsorption capacity of ball clay for the four types of ions also shared a trend of rapid increase followed by slow increase until it was stable.The intensities of four heavy metal ions on the active sites of ball clay were ranked in the descending order of Cr6+,Cd2+,Zn2+,and Cu2+.Isotherm fitting found that the multi-component heavy metal ion adsorption was more consistent with the Langmuir isothermal adsorption model.The adsorption mode and process were consistent with those of the mono-component heavy metal ions.There was a decrease in the maximum adsorption capacity of ball clay for each ion in the multi-component heavy metal ion solutions.However,the total amount of adsorption increased greatly in the ball clay,indicating the better adsorption capacity for the multi-metal ions and the synergistic effect among heavy metals.Therefore,the ball clay can be expected to serve as the greater adsorption for the heavy metal ions.This finding can provide the theoretical basis and data support to the ball clay as an adsorbent,The treatment efficiency of industrial wastewater can be improved to reduce the secondary pollution to rivers and agricultural products,particularly with the great practical significance.关键词
重金属/等温线/动力学/球黏土/单组分吸附/多组分吸附Key words
heavy metal/isotherms/kinetics/ball clay/mono-component adsorption/multi-component adsorption分类
资源环境引用本文复制引用
陈榕,王彪,郝冬雪,高晋宁,王伟卓,高宇聪..球黏土对单及多组分重金属离子的吸附效果[J].农业工程学报,2024,40(4):245-253,9.基金项目
国家自然科学基金项目(52078108) （52078108）
吉林省科技厅中青年科技创新领军人才及团队项目(20210509058RQ) （20210509058RQ）
