The carboxyethyl chitosan(CEC)was synthesized by chitosan as materails with acrylic acid by Michael reaction.The factors such as mass ratio,pH value,time and temperature were investigated and the structure of the CEC ...The carboxyethyl chitosan(CEC)was synthesized by chitosan as materails with acrylic acid by Michael reaction.The factors such as mass ratio,pH value,time and temperature were investigated and the structure of the CEC was characterized by FT-IR,1H NMR.The results show:the mass ratio is 1:4,the best pH value is 6,the time is 5h and the optimum temperature is 90℃,the substitution degree of CEC is 0.75.The reaction proceeded in a short time compared with literature,The carboxyethylation mainly occurred on NH2.展开更多
The complex of a high deacetylated chitosan with Cd 2+ was prepared and characterized by XPS and IR. A mechanism of adsorption of Cd 2+ onto chitosan molecule is proposed that both physical adsorption and chemical ads...The complex of a high deacetylated chitosan with Cd 2+ was prepared and characterized by XPS and IR. A mechanism of adsorption of Cd 2+ onto chitosan molecule is proposed that both physical adsorption and chemical adsorption occurr between Cd 2+ and -NH 2.展开更多
文摘The carboxyethyl chitosan(CEC)was synthesized by chitosan as materails with acrylic acid by Michael reaction.The factors such as mass ratio,pH value,time and temperature were investigated and the structure of the CEC was characterized by FT-IR,1H NMR.The results show:the mass ratio is 1:4,the best pH value is 6,the time is 5h and the optimum temperature is 90℃,the substitution degree of CEC is 0.75.The reaction proceeded in a short time compared with literature,The carboxyethylation mainly occurred on NH2.
文摘The complex of a high deacetylated chitosan with Cd 2+ was prepared and characterized by XPS and IR. A mechanism of adsorption of Cd 2+ onto chitosan molecule is proposed that both physical adsorption and chemical adsorption occurr between Cd 2+ and -NH 2.
