红土镍矿基材料吸附及有氧降解水体污染物

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Abstract Taking laterite nickel ore as the research object, the removal efficiencies of rhodamine B(RhB) with the raw ore (HT) and the modified ore (HT-FeNi) were investigated systematically. The adsorption mechanism of RhB was studied by X-ray diffraction, specific surface area analyser, infrared spectrum, and the kinetic and isothermal adsorption characteristic analyses. The results show that the HT possesses a relatively rich pore structure and a good adsorption performance on RhB. When added 0.2g/Lof HT, a RhB removal efficiency of 39.03% and a adsorption capacity of 93.80mg/g were reached. The RhB removal efficiency was enhanced, while the equilibrium adsorption capacity was decreased with the increasing dosage of HT. The adsorption kinetics and isotherms of RhB were well fitted by pseudo-second-order kinetic and Freundlich equation, respectively. The adsorption process might include two steps:surface diffusion and intra-particle diffusion. The 1/n was less than 0.5, which indicated that the adsorption process occurred more easily. The adsorption capacity of 39.67mg/g was still remained after 5cycles of experiments, indicating a good recycling performance of HT. The adsorption of RhB by HT was mainly attributed to the adsorption site of Si-O. The modified ore (HT-FeNi) was prepared by gas reduction of raw ore (HT). SEM、XRD、BET and XPS were used to characterize HT-FeNi and the degradation efficiency of RhB with this material was investigated. The specific surface area of HT-FeNi was smaller (14.374m²/g), and its main component was Fe-Ni bimetallic. HT-FeNi could not remove RhB by adsorption. However, the degradation efficiency of RhB could reach 94% in HT-FeNi/Air/pH=3system within 40min. The reactive oxygen species capture experiments indicated that the hydroxyl radical (·OH) played a major role for the RhB degradation. HT-FeNi could activate O₂ under acidic condition and ·OH formed. The Fe²⁺/Fe³⁺ cycle induced by Ni⁰ promoted the production of ·OH. Then HT-FeNi/Air/pH=3system was applied to the removal of MO and DNCB, the removal efficiencies were 47% and 78%, respectively.

Key words： laterite nickel ore-based materials adsorption aerobic degradation water pollutants

Received: 24 June 2021

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X753

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	Articles by authors
	WANG Bing-ning
	LIU Shou-jun
	YANG Song
	CHEN Liang-yu
	LIU Xing-yang
	LI Jin
	SHANGGUAN Ju

Cite this article:

WANG Bing-ning,LIU Shou-jun,YANG Song等. Adsorption and aerobic degradation of water pollutants by laterite nickel ore-based materials[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 736-744.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/736

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