羧基甲壳素对Pb(Ⅱ)的吸附性能及机理研究

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Abstract

Chitin was modified into carboxylated chitin by 2, 2, 6, 6-tetramethylpiperidine-1-oxyl radical (TEMPO) with hypochlorite (NaClO) and sodium bromide (NaBr) for enhancing adsorption performance of Pb(Ⅱ) from aqueous solution. Carboxylated chitin prepared was characterized by FTIR, solid ¹³C-NMR, XRD and SEM-EDX. Batch experiments with various parameters of the carboxylated chitins modified with different volume of NaClO, pH value of solution, initial concentration of Pb(Ⅱ), contact time and ionic strength on the adsorption performance of Pb(Ⅱ) were investigated. The surface characteristics of carboxylated chitin before and after Pb(Ⅱ) adsorption were examined using XPS. The results showed oxidation modification did not change the crystal structure and crystallinity of chitin and the carboxyl groups were introduced onto the surface of chitins. The volume of NaClO and pH had significant influence on the adsorption capacity. When the pH value of solution was in the range of 4~6, the adsorption capacity of carboxylated chitin prepared with 30mL NaClO reached a high level and the maximum adsorption was 233.64mg/g at room temperature. The adsorption process reached equilibrium within 60min and could well be described by pseudo-second-order kinetic and the Frendlich isotherm models. The Pb(Ⅱ) removal mechanism on carboxylated chitin included electrostatic interaction, chelation and ion exchange.

Key words： carboxylated chitin Pb (Ⅱ) adsorption mechanism

Received: 28 November 2017

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	Articles by authors
	SUN Xu-bing
	WU Xue-mei
	ZHU Jian-fa
	You Yao-hui

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SUN Xu-bing,WU Xue-mei,ZHU Jian-fa等. Adsorption performance and mechanism of Pb(Ⅱ) onto carboxylated chitin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(8): 3018-3028.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I8/3018

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