摘要
粉煤灰(FA)含有一定量的铁铝矿物,具有较大的比表面积,对重金属具有一定的吸附能力。为提高其对重金属的吸附能力,该研究采用湿法机械球磨联合磷基材料(KH2PO4)碱改性(CaO)方法制备改性材料(QMFA),考察其对铜(Cu)、镉(Cd)和铅(Pb)的吸附效果。结果表明:球磨时间2 h,固液比为1∶5时制备的QMFA对Cu、Cd和Pb的吸附能力最高;相较于FA,QMFA的表面出现少许绒状物质,变得更加粗糙,比表面积增加了4.78倍;XRD、FTIR和XPS分析表明QMFA中Ca、P和K含量较FA显著增加,增加了P-O强度,且新增了磷酸盐矿物。等温吸附表明FA和QMFA对Cu、Cd和Pb的吸附符合Langmuir模型,QMFA对Cu、Cd和Pb最高吸附量较FA分别提高了1.31、2.45和1.58倍,且其对Cd和Pb的解吸率显著低于FA。FA和QMFA对Cu、Cd和Pb的动力学吸附符合伪二阶动力学模型,表明以化学吸附为主。另外,FA和QMFA对Cu、Cd和Pb的吸附均随着溶液pH的增加而增加,且在同一pH下对Pb的吸附效果显著优于Cu和Cd。研究表明机械球磨联合磷基材料碱改性方法较单一的碱改和机械球磨改性制备的QMFA对Cu、Cd和Pb具有更好的吸附固定能力,在重金属污染废水的吸附去除方面具有较好的应用潜力。
Fly ash(FA)possesses the capability to adsorb heavy metals,attributed to its content of iron and aluminum miner⁃als alongside a substantial specific surface area.To augment its heavy metal adsorption efficacy,a modified material(QMFA)was synthesized through the wet mechanical ball milling of fly ash,integrated with alkali modification(CaO)and the incorpo⁃ration of phosphorus-based material(KH2PO4).The adsorption efficiency of this novel material towards copper(Cu),cadmium(Cd),and lead(Pb)was meticulously examined.Findings revealed that QMFA,processed with a ball milling duration of 2 hours and a solid-liquid ratio of 1∶5,exhibited superior adsorption capacities for Cu,Cd,and Pb.In comparison to FA,QMFA’s surface was markedly rougher,and its specific surface area expanded by 4.78-fold.Analyses via XRD,FTIR,and XPS underscored that the modification process enriched QMFA with Ca,P,and K,fostered the formation of phosphate minerals,and amplified the strength of P-O functional groups relative to FA.The adsorption dynamics of Cu,Cd,and Pb by both FA and QMFA conformed to the Langmuir model.Notably,QMFA’s maximum adsorption capacities for Cu,Cd,and Pb surpassed those of FA by factors of 1.31,2.45,and 1.58,respectively,with a markedly lower desorption rate for Cd and Pb.The adsorption kinetics for these metals by FA and QMFA aligned with the pseudo-second-order kinetic model,indicative of a chemisorption-dominated mechanism.Furthermore,the adsorption efficacy of Cu,Cd,and Pb by both materials escalat⁃ed with increasing solution pH,with Pb adsorption significantly outstripping that of Cu and Cd at equivalent pH levels.This investigation demonstrates that the amalgamation of mechanical ball milling with alkali modification of phosphorusbased materials yields QMFA with enhanced adsorption and immobilization capabilities for Cu,Cd,and Pb,surpassing those of materials modified solely through alkali treatment or mechanical ball milling.The study indicates that QMFA,fabri⁃cated via wet ball milling combined with alkali modification of phosphorus-based materials,exhibits superior adsorption and fixation capacities for Cu,Cd,and Pb,heralding promising applications in the remediation of wastewater contaminated with heavy metals.
作者
吴求刚
余文理
赵恒
王新富
刘笑生
郭腾飞
崔红标
WU Qiugang;YU Wenli;ZHAO Heng;WANG Xinfu;LIU Xiaosheng;GUO Tengfei;CUI Hongbiao(Jiangsu Design Institute of Geology for Mineral Resources(Testing Center of China National Administration of Coal Geology),Xuzhou 221006,China;Key Laboratory of China National Administration of Coal Geology for Coal Resources and Mineral Resources,Xuzhou 221006,China;School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China)
出处
《环境科学与技术》
北大核心
2025年第8期39-48,共10页
Environmental Science & Technology
基金
中国煤炭地质总局科技项目(ZMKJ-2023-JBGS02-02,ZMKJ-2023-JBGS02-03)
徐州市创新引领示范专项项目(KC23381)
江苏省碳达峰碳中和科技创新专项项目(BE2023855)。
关键词
粉煤灰
湿法球磨
吸附
铜
镉
铅
fly ash
wet ball milling
adsorption
Cu
Cd
Pb
