摘要
为了实现市政污泥的减量化、无害化及资源化,首先,以市政污泥制备的生物炭(MSBC)为骨架,负载纳米零价锌(nZVZ)后得到nZVZ-MSBC,再与聚乙烯醇(PVA)复合,最后用钙离子作为交联剂,制备了nZVZ-MSBC/PVA小球,将其用于水中磷的吸附。利用SEM、BET、FTIR和XPS对nZVZ-MSBC/PVA小球的微观形貌、结构进行了表征,考察了m(nZVZ-MSBC)∶m(PVA)对nZVZ-MSBC/PVA小球吸附水中磷性能的影响,探究了其吸附过程的动力学和热力学特性,推测了其吸附机理。结果表明,以m(nZVZ-MSBC)∶m(PVA)=1∶1制备的nZVZ-MSBC/PVA小球〔nZ-C/PVA(1∶1)〕对pH=5的含磷溶液具有最佳的磷吸附性能,其形貌为三维多孔结构;nZ-C/PVA(1∶1)对磷的吸附是一个吸热过程,符合伪二级动力学模型和Langmuir模型,在318 K下最大吸附量可达274.30 mg/g,其对磷的吸附过程中单层化学吸附占主导地位;吸附机理包括静电相互作用、氢键连接、表面沉积及络合作用等。
In order to achieve the reduction,harmlessness and recycling of the municipal sludge,nZVZ-MSBC was prepared from loading biochar(MSBC)obtained from municipal sludge with nano-zero-valent zinc(nZVZ),then compounded with polyvinyl alcohol(PVA),and finally cross-linked using Ca2+to synthesize nZVZ-MSBC/PVA beads for adsorption of phosphate from water.The micromorphology and structure of nZVZ-MSBC/PVA beads were characterized by SEM,BET,FTIR and XPS.The effect of m(nZVZ-MSBC)∶m(PVA)on phosphate adsorption performance of nZVZ-MSBC/PVA beads was evaluated,with the kinetics and thermodynamic process explored and the adsorption mechanism speculated.The results showed that nZVZ-MSBC/PVA beads prepared with m(nZVZ-MSBC)∶m(PVA)=1∶1[nZ-C/PVA(1∶1)]exhibited a three-dimensional porous structure and the best phosphate adsorption performance from phosphate solution at pH=5.The phosphate adsorption by nZ-C/PVA(1∶1)beads was an endothermic process,and fitted into pseudo-second-order dynamics and Langmuir models.The maximum adsorption amount could reach 274.30 mg/g at 318 K.The adsorption process was dominated by monolayer chemisorption,with the adsorption mechanism attributed to electrostatic interaction,hydrogen bonding,surface deposition,complexation and so on.
作者
张文博
张泽宇
张宇鹏
张宏
陈立军
裴亮
ZHANG Wenbo;ZHANG Zeyu;ZHANG Yupeng;ZHANG Hong;CHEN Lijun;PEI Liang(Key Laboratory of Environmental-Friendly Composite Materials of the State Ethnic Affairs Commission,College of Chemical Engineering,Northwest Minzu University,Lanzhou 730030,Gansu,China;Ecological Environment Monitoring Center of Zhangye in Gansu Province,Zhangye 734000,Gansu,China;Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China)
出处
《精细化工》
北大核心
2025年第9期1933-1940,2037,共9页
Fine Chemicals
基金
国家自然科学基金项目(22066020)
西北民族大学中央高校基本科研业务费专项资金项目(31920240073)。
关键词
市政污泥
生物炭
聚乙烯醇
吸附
磷
功能材料
municipal sludge
biochar
polyvinyl alcohol
adsorption
phosphate
functional materials
