文献类型：期刊文献

英文题名：Influences of chemically controlled Ca-bearing minerals in chitosan on Pb2+removal efficiency

作者：Alam, Ohidul[1];Qiao, Xiuchen[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, State Key Lab Chem Engn, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：18

期号：2

起止页码：993

外文期刊名：JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE AND ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000566824300001)】；

基金：This research was financially supported by the Social Development Program (BE2019687), Jiangsu, P.R. China.

语种：英文

外文关键词：Ca-bearing minerals; Deproteinization; Demineralization; Chitosan; Lead; Shrimp wastes

摘要：Highly purified chitosan was generally preferred for heavy metal (HM) removal and the preparation parameters varied largely without any agreement. This study investigated to the influences of chitin with different purities on the HM removal of corresponding chitosan. Sea shrimp waste was used as raw materials and Pb(2+)was used as target HM. The results of orthogonal experimental analysis showed that only acid concentration played an important role in the deproteinization and demineralization processes of the chitin preparation under HCl, H(2)SO(4)and CH3COOH treatment. Ca-bearing minerals (CBM) but not free -NH(2)group of chitosan played a major role in the removal of Pb(2+)from solution. Partly purified chitosan mainly removed Pb(2+)by precipitation and then biosorption. The dissociation of Ca(2+)from CBM elevated pH value of Pb(2+)solution which benefited to precipitation and the formation of NH2-Pb2+. Partly purified chitosan prepared from HCl and CH3COOH treated chitin showed 720-753 mg/g of Pb(2+)adsorption at the initial pH value of 6.0; however, highly purified chitosan prepared from HCl treated chitin showed only 45-160 mg/g. Chitosan prepared from H(2)SO(4)treated chitin showed 720-752 mg/g of Pb(2+)adsorption. This research found the unexplored information for the industrial application of chitosan with minimum cost but the highest HM removal efficiency.