1. Preparation of acrylic acid-modified chitin improved by an experimental design and its application in absorbing toxic organic compounds
- Author
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Huang, Chao-Ming, Chen, Lung-Chuan, Yang, Hui-Chia, Li, Min-Hsing, and Pan, Ting-Chung
- Subjects
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ACRYLIC acid , *CHITIN , *EXPERIMENTAL design , *ORGANIC compounds & the environment , *ENVIRONMENTAL toxicology , *GRAFT copolymers , *NITRATES , *COMPOSITE materials , *FOURIER transform infrared spectroscopy - Abstract
Abstract: Chitin grafted poly (acrylic acid) (chi-g-PAA) is synthesized and characterized as an adsorbent of toxic organic compounds. Chi-g-PAA copolymers are prepared using of ammonium cerium (IV) nitrate (Ce4+) as the initiator. The highest grafting percentage of AA in chitin obtained using the traditional technique is 163.1%. A maximum grafting percentage of 230.6% is obtained using central composite design (CCD). Experimental results are consistent with theoretical calculations. The grafted copolymer is characterized by Fourier transform Infrared spectroscopy and solid state 13C NMR. A representative chi-g-AA copolymer is hydrolyzed to a type of sodium salt (chi-g-PANa) and used in the adsorption of malachite green (MG), methyl violet (MV), and paraquat (PQ) in aqueous. The monolayer adsorption capacities of these substances are 285.7, 357.1, and 322.6mg/g-adsorbent, respectively. Thermodynamic calculations show that the adsorption of MG, MV, and PQ are more favored at diluted solutions. The high adsorption capacity of chi-g-PANa for toxic matter indicates its potential in the treatment of wastewater and emergency treatment of PQ-poisoned patients. [Copyright &y& Elsevier]
- Published
- 2012
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