Modification Of Chitosan Fiber Cloth For The Adsorption Of Cu And Cr Ions From Shellfish Tissues

Residual of heavy metals such as Cu(Ⅱ)、Cr(Ⅵ) is a severe problem in seafood proc essing industry. Simple and efficient technology for removing heavy metals is important in seafood production, especially for those of high-value-added. Chitosan molecular cha in has many hydroxyls, amino and N-acelyl-. chitosan and its derivations can chelate se veral metal ions by hydroxyls, amino. Therefore, this article tried to use crosslink agent to improve stability of chitosan-nonwoven-cloth and then EDTA modify chitosan-nonw oven-cloth. This study investigated the feasibility of chitosan-nonwoven-cloth for removi ng Cu(Ⅱ)、Cr(Ⅵ) from the raw material liquid of seafood. We focus on the effect of chelating group (amino and carboxyl) and solution condition (pH, temperature, etc) on a dsorption. In addition, the impact of the presence of the protein on its binding capacity of Cu(Ⅱ)、Cr(Ⅵ) and adsorption capacity of Cr(Ⅵ) from shellfish tissue slurry were also studied.The results showed that the stability of cross-linked-chitosan fiber cloth with gluta raldehyde is significantly enhanced and stable in a complex biological copmonents con dition. EDTA-modified chitosan-nonwoven-cloth had an adsorption capacity of 170 mg/ g for Cr(Ⅵ). The use of 5%(wet weight relative to the sample) EDTA-modified chito san-nonwoven-cloth can reduce the Cr(Ⅵ) level to National Food Safety Standards.