Method for degrading chlorinated hydrocarbons in water by using illite reinforced ball-milled sulfidized micron zero-valent iron

By complexing illite with S-mZVIbm, the long-term reactivity of S-mZVIbm particles is maintained, which solves the problems of decreased activity and particle aggregation when ball-milled micron-sized zero-valent iron degrades chlorinated hydrocarbons in water, and achieves efficient and environmentally friendly remediation of chlorinated hydrocarbon pollutants.

CN118388014BActive Publication Date: 2026-06-02YANCHENG INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YANCHENG INST OF TECH
Filing Date
2024-05-17
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing ball-milled micron-sized zero-valent iron (S-mZVIbm) tends to form a passivation layer when degrading chlorinated hydrocarbons in water, leading to decreased reactivity, easy particle aggregation, low electron utilization, and difficulty in achieving long-term remediation.

Method used

By utilizing the adsorption and complexation of Fe(II) released from the reaction of illite with S-mZVIbm and H2O, the iron core of S-mZVIbm particles is kept exposed, avoiding the formation of a passivation layer. The complexation reaction of ball-milled sulfides is enhanced by illite, thus maintaining the long-term reactivity of S-mZVIbm particles. The complexation reaction of ball-milled sulfide micron-sized zero-valent iron degrades chlorinated hydrocarbons in water by illite is enhanced, thus avoiding the formation of a passivation layer and maintaining the long-term reactivity of S-mZVIbm particles.

Benefits of technology

It significantly improves the degradation efficiency of S-mZVIbm for chlorinated hydrocarbons, shortens the remediation time, reduces costs, and has a simple process, uses environmentally friendly raw materials, and is easy to store.

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Abstract

The application provides a method for degrading chlorohydrocarbon in water by using illite reinforced ball-milling sulfidation micro zero-valent iron, which comprises the following steps: first, a buffer solution with pH=7 is prepared by using 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, and an oxygen-free aeration treatment is performed; then, illite and S-mZVI bm are mixed to prepare a particle mixture, and the particle mixture is sealed and stored in the buffer solution with pH=7; finally, chlorohydrocarbon pollutants are added into the particle mixture of illite and S-mZVI bm , and a sealed oscillation reaction is performed, so that the concentration of the chlorohydrocarbon in the reaction system is determined. The application directly reinforces the activity of S-mZVI bm material by using illite, which is a clay mineral widely distributed in nature, so that the defects of S-mZVI bm , such as large particle size, slow degradation rate and decreased activity in the later reaction stage, are effectively solved, and the long-term reaction activity of the particles is ensured. The raw materials are green and environmentally friendly, the process is simple, and the materials are easy to obtain.
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