黑腐酸对Cd<sup>2+</sup>的吸附响应面优化及机理研究

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Abstract

In order to explore the the adsorption mechanism of humin (HM) for heavy metal, lignite was selected as the material for preparing HM and optimized the adsorption conditions. The conditions were optimized by response surface method with Box-Behnken design, whereas quadratic polynomial models of adsorption capacity and adsorption rate of Cd²⁺ on HM could be established. The results showed that the pH, dosage of HM and initial concentration of Cd²⁺ presented the higher effect on Cd²⁺ adsorption of HM. It indicated that the optimum adsorption conditions were obtained at the temperature of 308K, 107.82 min, pH 5.55, dosage of HM 0.05g and Cd²⁺ initial concentration of 95.56mg/L. In addition, the adsorption isotherm could be better fitted by Langmuir models than that by Freundlich. The maximum adsorption capacity (54.20mg/g) of Cd²⁺ on HM was obtained at the temperature of 308K, and the thermo dynamic parameters (DG⁰ < 0, DH⁰ > 0, DS⁰ > 0) indicated that this adsorption was an endothermic and spontaneous process when the entropy of the system increased. Besides, according to SEM-EDS and FTIR, the HM surface exhibited higher specific surface area and porous volume. Moreover, it hosted lots of functional groups, such as carboxyl, hydroxyl. This suggested that the Cd²⁺ adsorption on HM was attributed to the hydrogen bond generated by the oxygen groups and the ion exchange between Cd²⁺ inorganic mineral substance on HM surface. This study could provide theoretical foundation for revealing the adsorption mechanism of HM on heavy metals.

Key words： humin response surface methodology isothermal adsorption thermodynamics characterization

Received: 24 November 2019

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X131

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	Articles by authors
	MEN Shu-hui
	HUANG Zhan-bin
	LI Fang-ze
	WANG Ping

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MEN Shu-hui,HUANG Zhan-bin,LI Fang-ze等. Adsorption of Cd²⁺ by humin: response surface methodology and mechanism study[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(6): 2615-2626.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I6/2615

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