丙烯酸-壳聚糖凝胶负载废酵母处理重金属离子  

Preparation of Waste-Yeast-Loaded Acrylic Acid/Chitosan Gel for Removing Heavy Metal Ions

作　　者：王霏 李升军 崔荣煜 吴金秋 楚飞虎 曹丰[1] 冯芳[1] WANG Fei;LI Shengjun;CUI Rongyu;WU Jingqiu;CHU Feihu;CAO Feng;FENG Fang(Jiangsu Key Lab for Environment Functional Materials,School of Chemistry and Life Science,University of Science and Technology Suzhou,Suzhou 215000,China;Jiangsu Green Functional Water Treatment Agent Research Center,AQUA Worth(Suzhou)Environmental Protection Co.,LTD.,Suzhou 215000,China)

机构地区：[1]苏州科技大学化学与生命科学学院,江苏省环境功能材料重点实验室,江苏苏州215000 [2]爱环吴世(苏州)环保股份有限公司,江苏省绿色功能型水处理剂工程技术研究中心,江苏苏州215000

出　　处：《环境科学与技术》2024年第4期62-70,共9页Environmental Science & Technology

基　　金：苏州市关键核心技术攻关(农业)项目(SNG2023013);苏州市关键核心技术攻关(社会发展)项目(2023ssd08);科技基础设施建设计划-工程技术研究中心(BM2020511);江苏省环境功能材料重点实验室开放基金(SJHG1807)。

摘　　要：目前,重金属废水处理技术研究中采用的生物吸附剂大多呈粉体状,会因活性结构特性不易保持,并且固液分离损失大、能耗高,导致其在重金属废水处理工程化应用受到制约。文章以丙烯酸和壳聚糖为原料,通过紫外交联法制备块体凝胶并负载废酵母作为生物吸附剂。研究紫外交联丙烯酸复合壳聚糖制成凝胶的优化条件,当丙烯酸与壳聚糖的比值为30∶1,加入15%质量百分比的N-N亚甲基双丙烯酰胺作为交联剂,再加入2%质量百分比的1173D作为光引发剂,此时制备出的含废酵母丙烯酸复合壳聚糖基水凝胶具有较好的溶胀性能和孔洞结构,对于Zn、Cd或Pb离子吸附去除率分别为27.8%、30.8%和38.8%。凝胶包埋废酵母后,去除水中低浓度的重金属Zn、Cd和Pb离子均有提升,对Pb^(2+)溶液的综合吸附去除率达到74.8%。丙烯酸-壳聚糖凝胶作为生物吸附剂载体实现简易快速包埋成型,块体形状有利于后续载体回收。At present,most of the bio-sorbent used in the technical research of heavy metal wastewater treatment are powder-like so it is not easy to keep their active structural features,and moreover,is liable to cause considerable loss of solid-liquid separation,consuming more energy,thus their application to the engineering of heavy metal wastewater treatment is restricted.In this paper,a lab experiment was implemented to prepare a sort of bulk-like gel with acrylic acid and chitosan as raw materials by the purple polymerization approach,and the gel was loaded with the waste yeast as a kind of bio-adsorbent.Then the optimal condition of preparing the gel was thereby studied and the results obtained showed that when the ratio of acrylic acid to chitosan was 30∶1,N-N methylene bisacrylamide with 15%mass percentage was added as a cross-linking agent,and 1173D with 2%mass percentage was added as a photo-initiator,the composite chitosan hydro-gel prepared containing waste yeast acrylic acid featured a good swelling performance and pore structure,thus the adsorption removal rates of Zn,Cd and Pb ions attaining 27.8%,30.8%and 38.8%,respectively,and after the gel was loaded with the waste,which was embedded in the gel,the removal of Zn,Cd and Pb ions(in low concentration)from water was improved,and with the comprehensive adsorption approach,the rate of Pb removal from Pb^(2+)solution reached 74.8%.In short,the preparing of acrylate-chitosan gel(as the carrier of biological adsorbent)was a simple and rapid embedding molding method,and the bulk-like shape was conducive to subsequent carrier recovery.

关 键 词：生物吸附 废酵母 丙烯酸 壳聚糖 紫外交联 凝胶 重金属废水 

分 类 号：X703.5[环境科学与工程—环境工程]