A method for treating chromium-containing wastewater and its application in preparing electromagnetic shielding leather

Magnesium-chromium-iron ternary hydrotalcite nanomaterials were prepared by catalyzing a Fenton-like reaction with nano-zero-valent iron, solving the problems of bending electromagnetic shielding leather and treating chromium-containing wastewater. This enabled resource recycling and the preparation of electromagnetic shielding leather, meeting the needs of intelligent manufacturing.

CN117303553BActive Publication Date: 2026-03-17SHAANXI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202311458663.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-03
Publication Date
2026-03-17
Estimated Expiration
2043-11-03

AI Technical Summary

Technical Problem

Existing electromagnetic shielding leather is easily damaged when bent significantly, and current technology cannot effectively treat chromium-containing wastewater, resulting in resource waste and environmental pollution.

Method used

Using nano-zero-valent iron as a catalyst, magnesium-chromium-iron ternary hydrotalcite nanomaterials were prepared via a Fenton-like reaction. These materials were used for tanning leather, forming multi-point cross-links to improve bending performance, and for treating chromium-containing wastewater.

Benefits of technology

It has achieved efficient treatment and resource recycling of chromium-containing wastewater, and produced leather with good bending performance and electromagnetic shielding effect, meeting the needs of intelligent wearable materials.

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Abstract

This invention discloses a method for treating chromium-containing wastewater and its application in the preparation of electromagnetic shielding leather. The method utilizes a Fenton-like reaction with nano-zero-valent iron as a catalyst to destroy the difficult-to-remove chromium complex structure in the chromium-containing wastewater. Simultaneously, magnesium ions are added to prepare a magnesium-chromium-iron ternary hydrotalcite nanomaterial with tanning properties. This material is used as a tanning agent in the leather tanning process, imparting electromagnetic shielding properties to the finished leather. Furthermore, the electromagnetic shielding leather prepared by this invention meets the performance requirements of leather, exhibiting good physical and mechanical properties, good resistance to hot air aging and ultraviolet light aging, and high folding resistance. As a wearable electromagnetic shielding leather, it provides 18 dB electromagnetic shielding performance in the 8–12 GHz electromagnetic wave range while retaining the softness of leather. This invention provides a pathway for the treatment of chromium-containing wastewater and the preparation of electromagnetic shielding leather.
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