蛋白核小球藻的絮凝与对重金属Cd^(2+)的吸附性能研究  

Study on Chitosan Flocculation of Chlorella Pyrenoidosa and Its Adsorption Performance for Heavy Metal Cd

作　　者：李江洪 李勇昊 刘文书 彭念 李倩 陈雨点[1,2] LI Jianghong;LI Yonghao;LIU Wenshu;PENG Nian;LI Qian;CHEN Yudian(School of Chemistry and Chemical Engineering,Chongqing University of Science&Technology,Chongqing 401331,China;Chongqing Key Laboratory of Industrial Fermentation Microorganism,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆科技学院化学化工学院,重庆401331 [2]工业发酵微生物重庆市重点实验室(重庆科技学院),重庆401331

出　　处：《重庆科技学院学报（自然科学版）》2022年第1期63-67,共5页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：重庆市教委科学技术研究项目“构建低成本微藻培养体系的应用基础研究”(KJQN201901523);重庆科技学院硕士研究生创新计划项目“自絮凝微藻高效吸附重金属机制研究”(YKJCX2020538)。

摘　　要：利用光合效率高、生物吸附力强且可以大规模低成本开放培养的蛋白核小球藻吸附重金属Cd^(2+)是一种极具前景的水处理手段。藻细胞密度低,藻液处理量特别大,采收成本高成为限制其应用的重要瓶颈之一。结果表明,在蛋白核小球藻溶液中加入0.021%壳聚糖且pH为7时,蛋白核小球藻达到最佳絮凝状态,在此条件下,蛋白核小球藻对重金属Cd^(2+)的吸附率可以达到98.00%,吸附量为4.06 mg/g。实验证明,壳聚糖作为絮凝剂可实现低成本采收蛋白核小球藻且不影响其对重金属Cd^(2+)的吸附效果。Chlorella pyrenoidosa, featured by high photosynthetic efficiency, strong biosorption ability, and capability of large-scale low-cost open cultivation, is a highly promising water processing choice for Cd^(2+) adsorption.However, the bottlenecks against its application include low algal cell density, large algal liquid processing demand, and high costs of harvesting.The results show that the flocculation effect is optimized when 0.021% chitosan is added into Chlorella pyrenoidosa solutions at pH=7,and under these conditions, the Cd^(2+) adsorption efficiency is also optimized, and the adsorption capacity and efficiency are maximized to 4.06 mg/g and 98% respectively.This study offers a theoretical basis for the use of chitosan flocculants into low-cost harvesting of Chlorella pyrenoidosa without lowering Cd^(2+) adsorption efficiency, and for low-cost efficient processing of aqueous heavy metals.

关 键 词：壳聚糖 蛋白核小球藻 絮凝采收 重金属吸附 水处理 

分 类 号：O647[理学—物理化学]