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Citation: SHI Guang, YUAN Yan-Chao, CHEN Bing-Ren, WANG Rui-Xiang. Structure and Adsorption Property of Crosslinked Chitosan Towards Metal Ions[J]. Chinese Journal of Applied Chemistry, ;2005, 22(2): 195-199. shu

Structure and Adsorption Property of Crosslinked Chitosan Towards Metal Ions

1.
Department of Chemistry, South China Normal University, Guangzhou 510631

Corresponding author: SHI Guang,
Received Date: 15 March 2004
Available Online: 8 October 2004

The adsorption of Cu²⁺, Ni²⁺ and Co²⁺ onto chitosan crosslinked by formaldchyde and epichlorohydrin (AECTS) has been studied. The adsorption capacities of AECTS towards Cu²⁺, Ni²⁺ and Co²⁺ were found to be 2.42, 1.37 and 0.39 mmol/g, respectively. The FTIR analysis indicates that the adsorption was realized via the coordination of -NH₂ and -OH groups in AECTS to the metal ions, and the binding strength was positively proportional to the adsorption capacity. WAXD results indicate metal ions adsorbed onto both the amorphous and crystal regions of AECTS, and the destructive degree of the crystal region was in direct proportion to the adsorption capacity. TG analysis shows that the crosslinking and metal ions adsorption could change the three decomposition temperatures of CTS to lower degree, depending on adsorption capacity change.
- cross-linked chitosan,
- Cu²⁺,
- Co²⁺,
- Ni²⁺,
- structure,
- adsorption property
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