壳聚糖改性及其对水泥固化重金属性能的影响  

Effect of Chitosan Modification on Heavy Metal Properties of Cement Consolidation

作　　者：张锋 崔素萍[1] 王亚丽[1] 郑焱[1] 王子豪 ZHANG Feng;CUI Suping;WANG Yali;ZHENG Yan;WANG Zihao(Materials Science and Engineering,Beijing University of Technology,Beijing 100124)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《硅酸盐学报》2024年第11期3513-3523,共11页Journal of The Chinese Ceramic Society

基　　金：重点研发计划(2022YFC3901205)。

摘　　要：水泥窑协同处置含重金属固废作为一种无害化资源化处理方式具有巨大的优势,但是由于水泥水化产物对于重金属存在固溶极限,导致固废处置量受到限制。本工作提出制备具有高效吸附重金属离子性能的乙二胺四乙酸联合氨基硫脲改性壳聚糖(TS-EDTA-C),加入到水泥基材料中提升吸附重金属的性能。通过胶砂强度、离子浸出浓度分析、Tessier五步连续提取法、SEM-EDS分析、XRD分析和水化热分析测试改性壳聚糖对含重金属水泥性能的影响。结果表明:掺入TS-EDTA-C材料后,含有重金属的水泥胶砂试样强度在各个龄期均有所提高和重金属离子的浸出浓度明显降低。Tessier五步连续提取法和SEM-EDS试验证明了TS-EDTA-C在水泥中成功吸附了重金属并以更加稳定的形态存在。XRD和水化热分析结果也证明了TS-EDTA-C添加后含重金属水泥的早期水化产物更多,弱化了重金属离子对早期水化带来的不利影响。Introduction Co-disposal in cement kilns is a disposal method to achieve harmless and resourceful reuse of solid waste.However,cement kiln co-disposal technology is constrained by some specific components in solid waste.For solid wastes with a high content of heavy metals,such as waste battery slag,fly ash and electroplating sludge,heavy metals are involved in the clinker firing process through solid-phase and liquid-phase reactions during co-disposal in cement kilns,which may ultimately increase the content of heavy metals in the cement clinker,which can be re-released in the course of use,posing a threat to the environment and human safety.Also the presence of heavy metal ions can have a hindering effect on cement hydration.In recent years,fiber adsorbent materials have been widely used to treat heavy metal ions in wastewater,and researchers have prepared related materials with excellent performance.Chitosan is one of them,which is a natural biopolymer similar in structure to cellulose fibers commonly used in construction projects.Chitosan has its unique advantages:renewable resource,wide range resource,relatively low cost,having functional groups such as hydroxyl and amino,which,makes it an excellent adsorbent for metal ions.This work prepared modified chitosan material and its application on heavy metal-containing cement was investigated.Mthods Chitosan,disodium EDTA,1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride,N-hydroxysuccinimide,formaldehyde,aminothiourea,copper nitrate,lead nitrate,zinc nitrate,anhydrous ethanol and other compounds at analytically pure grade were supplied by Beijing Jiashiteng Trade Limited Liability Company.The cement P·I 42.5 and standard sand used in this study were produced from Fushun Ausair Technology Limited Liability Company.In this study,an aminothiourea combined with ethylenediaminetetraacetic acid modified chitosan material(TS-EDTA-C)was prepared to increase its adsorption and stability of heavy metal ions by modification.TS-EDTA-C was added to the cement containi

关 键 词：壳聚糖改性 水泥性能 重金属 浸出毒性 

分 类 号：TQ172.1[化学工程—水泥工业] X705[化学工程—硅酸盐工业]