title: Preparation and copper ions adsorption properties of thiosemicarbazide chitosan from squid pens.
abstract: Chitosan was prepared by alkaline N-deacetylation of β-chitin from squid pens. Thiosemicarbazide group was introduced to chitosan via formaldehyde-derived linkages, and thiosemicarbazide chitosan (TSFCS) with different degrees of substitution (DS) was synthesized. The DS values of TSFCS calculated by elemental analysis were 0.19, 0.36 and 0.63. The structure of the TSFCS was confirmed by elemental analysis, FTIR, XRD, TGA and SEM. The adsorption capacity of Cu(II) ions by TSFCS showed good correlation with the DS and pH (pH range 2.2-5.8). The maximum Cu(II) ions adsorption capacity of all three TSFCS samples reached 134.0mgg-1at pH 3.6, but chitosan showed no adsorption at this pH. The adsorption equilibrium process of Cu(II) ions onto TSFCS was better described by the Langmuir model than the Freundlich isotherm model. Cu(II) ions adsorbed by TSFCS could be released using 0.01M Na2EDTA and the adsorption capacity could retain above 80% after five adsorption-desorption cycles. TSFCS exhibited good potential for heavy metal removal because of its high adsorption capacity at the low pH.
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
authors.forename: Yue-Cheng
authors.initials: YC
authors.lastname: Lin
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
authors.forename: Hong-Peng
authors.initials: HP
authors.lastname: Wang
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
authors.forename: Faryal
authors.initials: F
authors.lastname: Gohar
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
authors.forename: Muhammad Haseeb
authors.initials: MH
authors.lastname: Ullah
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
authors.forename: Dong-Fang
authors.initials: DF
authors.lastname: Xie
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Fang
authors.affiliation: Key Laboratory of Agricultural Products Chemical and Biological Processing Technology of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, PR China. Electronic address: hjunlzr@163.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Huang
authors.affiliation: Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, PR China. Electronic address: yangajx@igsnrr.ac.cn.
authors.forename: Jun-Xing
authors.initials: JX
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D000818:Animals; D048271:Chitosan / Q000737:chemistry*; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification*; D049832:Decapodiformes; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012663:Semicarbazides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D012663:Semicarbazides; D014874:Water Pollutants, Chemical; C005151:thiosemicarbazide; D003300:Copper; D048271:Chitosan
keywords: Adsorption; Cu(II) ion; Thiosemicarbazide chitosan