Li Xiang, Zhang Xianming, Xie Shiyu, Ge Yaling, Feng Li, Li Wei
Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University Chongqing 400067 China
School of Civil Engineering and Architecture, Chongqing University of Science and Technology Chongqing 401331 China.
RSC Adv. 2022 Jul 21;12(32):20857-20865. doi: 10.1039/d2ra01727j. eCollection 2022 Jul 14.
In view of the diversification of pollutants in current sewage, further improving the application efficiency of water treatment agents and realizing multi-functionalization are important directions for the research of water treatment agents. In this paper, on the basis of the natural polymer flocculant chitosan, MAPTAC and AM were used as modified monomers to improve its solubility and also enhance its flocculation and bactericidal properties. Furthermore, the preparation conditions of chitosan flocculant poly(CTS--AM-MAPTAC) were optimized by response surface methodology, and its flocculation and sterilization functions were evaluated in detail. The experimental results showed that the significance order of the factors in the preparation process was illumination time, mass ratio of total monomer to chitosan, molar ratio of monomers, and initiator concentration. The optimum conditions for preparing poly(CTS--AM-MAPTAC) were 6 moL L for initiator concentration, 4 for mass ratio of total monomer to chitosan, 25% for monomer molar ratio, and 60 min for illumination time. The intrinsic viscosity and grafting rate of poly(CTS--AM-MAPTAC) prepared under optimum conditions were 5.4965 dL g and 220.34%. The obtained poly(CTS--AM-MAPTAC) had good solubility, which could fully expose the active sites in wastewater with different acidity and had good flocculation effect. The performance evaluation results showed that the flocculant had a good combination of flocculation and sterilization, and had the advantages of high turbidity removal and sterilization efficiency, good biodegradability and low reagent consumption.
鉴于当前污水中污染物的多样化，进一步提高水处理剂的应用效率并实现多功能化是水处理剂研究的重要方向。本文以天然高分子絮凝剂壳聚糖为基础，采用甲基丙烯酰氧乙基三甲基氯化铵（MAPTAC）和丙烯酰胺（AM）作为改性单体，以提高其溶解性，同时增强其絮凝和杀菌性能。此外，采用响应面法优化了壳聚糖絮凝剂聚（CTS-AM-MAPTAC）的制备条件，并对其絮凝和杀菌功能进行了详细评价。实验结果表明，制备过程中各因素的显著性顺序为光照时间、总单体与壳聚糖的质量比、单体摩尔比、引发剂浓度。制备聚（CTS-AM-MAPTAC）的最佳条件为引发剂浓度6 moL/L、总单体与壳聚糖质量比4、单体摩尔比25%、光照时间60 min。在最佳条件下制备的聚（CTS-AM-MAPTAC）的特性粘度和接枝率分别为5.4965 dL/g和220.34%。所得聚（CTS-AM-MAPTAC）具有良好的溶解性，能在不同酸度的废水中充分暴露活性位点，且絮凝效果良好。性能评价结果表明，该絮凝剂具有良好的絮凝与杀菌协同作用，具有浊度去除率高、杀菌效率高、生物降解性好、药剂消耗低等优点。
