A method for removing nitro compounds from water using pyrite-mediated atomic hydrogen reduction.

By using pyrite catalyst to react with sodium borohydride to generate atomic hydrogen, the problem of efficient reduction of nitro aromatic compounds and nitro imidazoles is solved, realizing inexpensive and rapid removal and conversion of nitro compounds in water, which is suitable for water environment remediation.

CN120208394BActive Publication Date: 2026-05-26SUN YAT SEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUN YAT SEN UNIV
Filing Date
2025-04-24
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing technologies, the reduction and removal efficiency of nitro aromatic compounds and nitro imidazoles is low, the cost of precious metal catalysts is high, the design of synthetic catalysts is complex and difficult to apply on a large scale, and existing methods are highly dependent on external energy sources.

Method used

Using pyrite (FeS2) as a catalyst, atomic hydrogen (H*) is generated at room temperature and pressure through reaction with sodium borohydride. This hydrogen is then used to reduce and remove nitro compounds from water, avoiding complex synthesis processes and high costs.

Benefits of technology

It achieves inexpensive and efficient reduction of nitro compounds, simplifies the process, reduces energy consumption, and is suitable for the rapid removal and conversion of nitro compounds in aquatic environments.

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Abstract

This invention discloses a method for removing nitro compounds from water by pyrite-mediated atomic hydrogen reduction, comprising the following steps: (1) washing and drying natural pyrite, then grinding it into a gray-black powder catalyst using a ball mill; (2) placing the catalyst in an aqueous solution of nitroimidazole or nitrobenzene at room temperature and pressure, followed by the addition of sodium borohydride, and continuously bubbling the solution with an inert gas; (3) under low catalyst dosage (0.8 g / L) and sodium borohydride dosage (<0.16 g / L), metronidazole, ornidazole with an initial concentration of 20 ppm are completely removed within 1 min, and nitrobenzene with a removal rate of 0.6 mM reaches 98.98% within 20 min, with the main reduction products being the corresponding amino compounds. This invention uses natural pyrite as a catalyst to mediate the generation of atomic hydrogen, with a simple process and safe reagents, providing a practical strategy for reducing nitro compound pollution in the aquatic environment.
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