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This research aims to develop a novel composite material to effectively remove toxic chromium from wastewater using a temperature-controlled method.

May 3, 20260 citations

A thermal-responsive quaternary ammonium- functionalized composite SiO2@QA-PNIPAM for efficient removal of Cr(VI) from wastewater.

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HJHaimei JiangChongqing University LZLinghao ZhangElectric Power Research Institute BWBaohui WangChongqing University of Science and Technology

Key Points

This research aims to develop a novel composite material to effectively remove toxic chromium from wastewater using a temperature-controlled method.
Developed SiO2@QA-PNIPAM composite for chromium removal through ion exchange and electrostatic interaction.
Implemented temperature-controlled regeneration method for adsorbents to optimize chromium treatment.
Analyzed the reduction of Cr(VI) to less toxic Cr(III) using amino groups in the composite.
Successfully reduced Cr(VI) to Cr(III), showing significant efficiency in chromium removal rates.
Demonstrated effective adsorption capacities under varying temperatures, enhancing treatment flexibility.
Proposed a green strategy for regeneration of adsorbents without harmful impacts.

Abstract

@QA-PNIPAM involves a synergistic process: initial capture via ion exchange and electrostatic interaction with quaternary ammonium groups, followed by the reduction of highly toxic Cr(VI) to less toxic Cr(III) by amino groups. This work presents a temperature-controlled regeneration method for adsorbents, enabling a green treatment strategy for chromium-containing wastewater.

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A thermal-responsive quaternary ammonium- functionalized composite SiO2@QA-PNIPAM for efficient removal of Cr(VI) from wastewater.

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