蛋白-多糖-Cr(Ⅲ)络合物的形成及其脱铬机制  

Formation and Chromium Removal Mechanism of Protein-polysacharide-Cr(Ⅲ)Complexes

作　　者：马宏瑞 杜佳怡 党靖雯 郝永永 朱超 MA Hongrui;DU Jiayi;DA NG Jingwen;HAO Yongyong;ZHU Chao(School of Environmental Science and Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China)

机构地区：[1]陕西科技大学环境科学与工程学院,陕西西安710021

出　　处：《皮革科学与工程》2024年第6期1-8,共8页Leather Science and Engineering

基　　金：国家自然科学基金(22076113)。

摘　　要：选取海藻酸钠(SA)、牛血清白蛋白(BSA)模拟制革废水处理过程中的多糖和蛋白,探讨了多糖、蛋白与Cr(Ⅲ)形成的不同络合物的特性及其稳定性。研究发现,SA和BSA与Cr(Ⅲ)结合后,所形成的络合物相对分子质量明显小于单独的配体,且主要通过配体分子内配位形成Cr(Ⅲ)络合物,络合物的零电荷点向pH中性偏移,增加了中和沉淀、絮凝沉淀的效果,但总铬去除率最高为85.62%。通过超声预处理与重捕剂协同絮凝剂的作用,络合物铬去除率可提高至98%以上,且不受pH的影响。此研究结果为非中性条件下铬的深度去除提供了理论和实践依据。In this study,sodium alginate(SA)and bovine serum albumin(BSA)were utilized to mimic polysaccharides and proteins during the leather tanning wastewater treatment.This research examined the characteristics and stability of various complexes formed by the interaction of polysaccharides,proteins,and Cr(Ⅲ).It was discovered that the molecular weights of the SA-BSA-Cr(Ⅲ)complexes were considerably lower than those of the separate ligands,suggesting that the complexes predominantly arise from intramolecular coordination.A shift in the isoelectric points of the complexes towards a neutral pH enhanced neutralization precipitation and flocculation sedimentation processes.However,the maximum chromium removal efficiency achieved was only 85.62%.Introducing ultrasonic pretreatment in combination with a reflocculation agent increased the chromium removal efficiency of the complexes to over 98%,with the process remaining unaffected by pH variations.The findings of this investigation offer a theoretical and practical foundation for the enhanced removal of chromium in non-neutral environments.

关 键 词：制革废水 Cr(Ⅲ)络合物 絮凝沉淀 超声预处理 海藻酸钠 牛血清白蛋白 

分 类 号：X794[环境科学与工程—环境工程]