硅化改性微米零价铁去除水体中镍离子

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Abstract A novel silicified micron zero-valent iron (Si-mZVI^BM) was prepared by mechanochemical method using soluble silicate as the precursor and the Si-mZVI^BM was applied to treat the nickel-containing wastewater. The results showed that the silicon modification can significantly enhance the nickel removal efficiency of micron zero-valent iron. Compared with the unmodified micron zero-valent iron, the nickel removal efficiency was increased by 8times. Furthermore, the Si-mZVI^BM showed excellent performances in a variety of actual nickel-polluted water bodies. Based on the microstructure, surface electronegativity and elemental composition analyses of the Si-mZVI^BM, it was found that the excellent nickel removal performance of Si-mZVI^BM was mainly due to the accelerated refinement of micron zero-valent iron particles by mechanical siliconization. The increase of specific surface area and dispersibility of the Si-mZVI^BM promoted the mass transfer of nickel from solution to material surface. At the same time, the silicification also could accelerate the electron transport rate at the interface of micron zero-valent iron, which resulted in rapid reduction and precipitate separation of nickel adsorbed on the surface, and eventually realized the efficient removal of nickel.

Key words： micron zero-valent iron soluble silicate mechanochemical method nickel

Received: 01 November 2022

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X703.5

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	Articles by authors
	MENG Yue
	CHEN Xin-fu
	ZHANG Xu
	ZHENG Ming-xia
	YU Min-da
	HU Xiang

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MENG Yue,CHEN Xin-fu,ZHANG Xu等. Removal of of Ni(II) from water using silicified micron zero-valent iron[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2874-2880.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2874

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