Open AccessInfluences of chemically controlled Ca-bearing minerals in chitosan on Pb2+ removal efficiency
Author(s) -
Ohidul Alam,
Xiuchen Qiao
Publication year - 2020
Publication title -
journal of environmental health science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
ISSN - 2052-336X
DOI - 10.1007/s40201-020-00521-9
Subject(s) - chitosan , demineralization , chitin , chemistry , adsorption , nuclear chemistry , precipitation , biosorption , chromatography , biochemistry , materials science , organic chemistry , sorption , physics , enamel paint , meteorology , composite material
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 CH 3 COOH 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 NH 2 -Pb 2+ . Partly purified chitosan prepared from HCl and CH 3 COOH 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.