半胱氨酸改性壳聚糖溶胶絮凝去除Cu~(2+)研究
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摘要
采用温和的离子交联法制得半胱氨酸(Cy)改性壳聚糖(CS)溶胶絮凝剂(Cy-CS)。研究了Cy含量、Cy-CS投加量、pH、絮凝剂状态对絮凝除Cu~(2+)性能的影响。结果表明,改性后Cy-CS溶胶的絮凝性能较Cy溶液、纯CS溶胶显著提升;优化的絮凝pH为4.0～5.5,当Cy的质量为1.85 g,Cy-CS絮凝剂投加量6.5 mL时,去除率最高为98.63%;溶胶态Cy-CS絮凝除Cu~(2+)性能优于水溶液态Cy-CS。可为其它CS基絮凝剂的制备提供新的思路。
Cysteine-modified chitosan sol flocculant(Cy-Cs) was prepared by mild ion crosslinking method. The effect of cysteine content, Cy-Cs dosage,pH and state of flocculant on the performance of flocculation for Cu~(2+)removal was studied. The results showed that, the flocculation performance of Cy-Cs sol after modification was significantly improved compared with that of cysteine solution and pure chitosan sol; The optimum flocculation pH was4.0～5.5, and the removal rate was 98.63% when the cysteine mass was 1.85 g and the Cy-Cs dosage was 6.5 m L; The performance of Cy-Cs for flocculation and removal of Cu~(2+)in sol state was better than that in aqueous state. It provided a new idea for the preparation of other chitosan-based flocculants.
Cysteine-modified chitosan sol flocculant(Cy-Cs) was prepared by mild ion crosslinking method. The effect of cysteine content, Cy-Cs dosage,pH and state of flocculant on the performance of flocculation for Cu~(2+)removal was studied. The results showed that, the flocculation performance of Cy-Cs sol after modification was significantly improved compared with that of cysteine solution and pure chitosan sol; The optimum flocculation pH was4.0～5.5, and the removal rate was 98.63% when the cysteine mass was 1.85 g and the Cy-Cs dosage was 6.5 m L; The performance of Cy-Cs for flocculation and removal of Cu~(2+)in sol state was better than that in aqueous state. It provided a new idea for the preparation of other chitosan-based flocculants.
引文
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[2]周晓勇,田亚运,张举斌.水葫芦对水溶液中Cu2+和Pb2+的吸附研究[J].水处理技术,2015,41(2):56-61.
[3]魏建文,何泽瑜,林志峰,等.偕胺肟基介孔二氧化硅对Cu2+的吸附性能[J].水处理技术,2017,43(11):67-72.
[4]赵兰萍,常青,王刚.新型絮凝剂PEX的配位竞争与协同作用研究[J].水处理技术,2010,36(5):46-49.
[5]管映兵,王刚,徐敏,等.新型重金属絮凝剂巯基乙酰化胺甲基聚丙烯酰胺的制备[J].水处理技术,2017,43(11):62-66.
[6]YANG R,LI H,HUANG M,et al.A review on chitosan-based flocculants and their applications in water treatment[J].Water Research,2016,95:59-89.
[7]BRATSKAYA S Y,PESTOV A V,YATLUK Y G,et al.Heavy metals removal by flocculation/precipitation using N-(2-carboxyethyl)chitosans[J].Colloids&Surfaces A Physicochemical&Engineering Aspects,2009,339(1):140-144.
[8]林正欢,李绵贵.天然高分子絮凝剂的研究和应用进展[J].水处理技术,2003,29(6):315-317.
[9]FUJITA S,SAKAIRI N.Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(II)ion[J].RSC Advances,2016,6(13):10385-10392.
[10]王爽,葛建团,常青,等.高分子重金属絮凝剂MAPEI处理含镉废水的研究[J].环境科学与管理,2011,36(6):56-60.
[11]张文杰.具有重金属捕集功能的高分子絮凝剂MAC的制备及其絮凝性能研究[D].兰州:兰州交通大学,2011.
[12]张鹏,张伟,廖为雄.絮凝剂CTS-GSH的合成及其除铬性能[J].过程工程学报,2018,18(2):312-317.
[13]张翠玲,张明月,常青,等.高分子重金属絮凝剂MCC制备及除铜去浊性能[J].环境工程学报,2014,8(7):2690-2696.
[14]熊英禹,付忠田,黄戊生.化学沉淀法处理模拟含铜废水的研究[J].环境保护科学,2014,40(2):35-38.
[15]章敏,常青,王进喜,等.高分子重金属絮凝剂MAC除Cu2+、去浊性能[J].环境科学学报,2007,27(12):1994-2000.