摘要
鉴于传统可渗透反应墙(PRB)填料价格昂贵,且易消蚀、钝化,本文以钢渣、脱硫石膏等固废材料制备了复合颗粒填料(CGF),探究CGF对Cd^(2+)的等温吸附与动力学特征,并结合浸水试验明确CGF的强度损失规律与散失特性。借助动态吸附试验探究不同条件下CGF的动态吸附规律,明确CGF对Cd^(2+)的净化机制。结果表明:CGF对Cd^(2+)的吸附过程受化学吸附与颗粒内扩散控制,符合PS-order模型与Langmuir模型。T3组CGF综合性能最好,吸附量达到8.12 mg/g,且28 d散失率最小,为4.98%,强度损失率为6.16%。Thomas模型可以很好地描述CGF的动态吸附行为,泵速对CGF的穿透曲线影响最大,且动态平衡吸附量qe随初始浓度、床层高度增加而提高。CGF通过水化反应、火山灰反应生成C-S-H凝胶、AFt等水化产物,在提供颗粒强度的同时又可通过共沉淀、离子置换等方式实现对Cd^(2+)的吸附。本文可为有色金属矿山污染场地的修复治理提供一种新思路。
Given that traditional permeable reaction barrier(PRB) fillers are expensive and susceptible to corrosion and passivation,this research prepared composite granular fillers(CGF) from steel slag,desulfurization gypsum,and others.The isothermal adsorption and kinetic characteristics of CGF on Cd^(2+) were investigated,and the immersion experiment revealed the strength loss laws and dissipation features of CGF.The dynamic adsorption laws of CGF were explored by the dynamic adsorption experiment,and the purification mechanism of CGF on Cd^(2+) was determined.The results show that the adsorption process of Cd^(2+) by CGF is controlled by chemisorption and intraparticle diffusion,which is consistent with the PS-order model and Langmuir model.The T3 group has the best performance of CGF,with adsorption of 8.12 mg/g,a minimum 28-day dissipation rate of 4.98%,and a strength loss rate of 6.16%.Thomas model can well describe the dynamic adsorption behavior of CGF,the pump speed has the greatest influence on the penetration curve,and the dynamic equilibrium adsorption quantity qe increases with the increase of concentration and bed height.CGF can generate hydration products,such as C-S-H gel and AFt,through hydration reactions and volcanic ash reactions,which can provide particle strength while achieving the adsorption of Cd^(2+) through coprecipitation and ion exchange.This study can provide a new method for the remediation of nonferrous metal mine-contaminated sites.
作者
江杰
王树飞
苏建
廖长君
罗豪豪
陈俊霖
JIANG Jie;WANG Shufei;SU Jian;LIAO Changjun;LUO Haohao;CHEN Junlin(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Bossco Environmental Protection Technology Co.,Ltd.,Nanning 530001,China;Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area,Ministry of Natural Resources,Nanning 530028,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2024年第6期2112-2126,共15页
The Chinese Journal of Nonferrous Metals
基金
国家重点研发计划资助项目(2019YFC1803500)
南宁市重点研发计划资助项目(20223040)
广西研究生教育创新计划资助项目(YCBZ2022008)
广西壮族自治区自然资源厅资助项目(GXZC2022-C3-002124-GYZB)
关键词
钢渣
可渗透反应墙
吸附
污染地下水
steel slag
permeable reactive barrier
adsorption
contaminated groundwater
