1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; 2. State Environmental Protection Key laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract：A novel silicified micron zero-valent iron (Si-mZVIBM) was prepared by mechanochemical method using soluble silicate as the precursor and the Si-mZVIBM 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-mZVIBM 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-mZVIBM, it was found that the excellent nickel removal performance of Si-mZVIBM 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-mZVIBM 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.
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