Vulcanized nano zero-valent iron with controllable sulfur content and form as well as preparation method and application of vulcanized nano zero-valent iron

Abstract

The invention relates to sulfurized nano zero-valent iron with controllable sulfur content and form as well as a preparation method and application thereof, the application comprises efficient selective removal of typical pollutants such as heavy metals and chlorine-containing organic matters in water, and the defects that nano zero-valent iron is poor in selectivity, easy to inactivate and the like are overcome. According to the invention, by regulating and controlling the type and dosage of the sulfur reagent and improving the synthesis conditions, the sulfur content and form controllable sulfur nano zero-valent iron with controllable sulfur content and form and high sulfur loading capacity and zero-valent iron with crystal phase are prepared, and the sulfur form of the zero-valent iron is ferrous sulfide or ferrous disulfide. The content and form of sulfur can regulate and control the physicochemical properties such as hydrophobicity, lattice constant, electron transfer and the like of the material, and improve the reaction activity and selectivity to target pollutants.

Description

technical field [0001] The invention relates to the technical field of material engineering and environmental engineering, in particular to a sulfided nano zero-valent iron with controllable sulfur content and form, a preparation method and application thereof. Background technique [0002] Highly reducing active materials are important tools for in-situ remediation of groundwater pollution. Due to its strong reducibility, nano-zero valent iron (NZVI) can quickly complete the dechlorination of organic solvents, antibiotics and other chlorine-containing refractory organics and the adsorption and removal of heavy metals, so it is widely used in groundwater in situ remediation. However, NZVI often reacts with water for hydrogen evolution, and this unnecessary side reaction consumes the reducing ability of NZVI, reduces its reaction life, and increases its dosage and cost for in-situ groundwater remediation. At present, some scholars have used polymer encapsulation, noble metal...

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Problems solved by technology

However, NZVI often undergoes hydrogen evolution reaction with water. This unnecessary side reaction consumes the reducing ability of NZVI, reduces its reaction life, and increases its dosage and cost for in-situ remediation of groundwater.

At present, some scholars have adopted methods such as polymer encapsulation, noble metal doping, and carbon-based material loading to improve the reactivity and stability of NZVI during repair, but there is still a lack of a method that can improve the selectivity of NZVI to target pollutants. Modification method while still maintaining high reactivity with target pollutants

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