絮凝剂合成与性能评估-黏度和叶绿素测定实验设计

Experimental design on flocculant synthesis and performance evaluation-viscosity and chlorophyll determination

基于建设一流本科专业和提高学生创新意识、综合实践能力目标,设计了具有材料制备和仪器分析特点的综合实验。针对现有壳聚糖基絮凝剂絮凝性能不足的原理,采用马来酸酐作为交联剂和双键供体引入壳聚糖,合成新型壳聚糖基絮凝剂CPAM-g-MCS。优化实验和FT-IR、TG、XPS分析表明絮凝剂被成功合成,马来酸酐可有效提高接枝絮凝剂的单体转化率和特性黏度。絮凝实验结果表明:CPAM-g-MCS对含藻水体中叶绿素a去除率为96.59%,絮体粒径更大且更集中,优于无马来酸酐絮凝剂。马来酸酐酰化接枝可显著提高絮凝剂网捕架桥/卷扫机制,并强化絮凝性能。

Based on constructing the first-class undergraduate program and improving students’ innovation consciousness and comprehensive practice ability, this study presents a comprehensive experiment with the characteristics of material preparation and instrumental analysis. According to the reasons of unsatisfied flocculation performance of available chitosan-based flocculants, maleic anhydride is introduced into chitosan as crosslinking agent and double bond donor, and a novel chitosan-based flocculants CPAM-g-MCS is synthesized. Optimization study and FT-IR、TG and XPS analysis show that flocculant CPAM-g-MCS is successful prepared, and maleic anhydride enhanced the monomer conversion and intrinsic viscosity remarkablely. Beaker experiment indicates that the Chl-a removal in Chlorella water sample by CPAM-g-MCS can achieve 96.59%, and the formed flocs is more centralized and bigger than the flocculants without maleic anhydride. Flocculation mechanisms show that the graft flocculants with maleic anhydride perform strong net bridge and sweeping ability, and superior flocculation performance.