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Chromium removal using resin supported nanoscale zero-valent iron
Fenglian Fu1, Jun Ma, Liping Xie
1School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China. fufenglian2006@163.com
Journal of Environmental Management
|July 23, 2013
Summary
Resin supported nanoscale zero-valent iron effectively removes hexavalent chromium (Cr(VI)) and trivalent chromium (Cr(III)) from wastewater. This novel material offers potential for efficient and regenerable chromium remediation.
Area of Science:
- Environmental Science
- Materials Science
- Nanotechnology
Background:
- Chromium contamination in wastewater poses significant environmental and health risks.
- Effective remediation technologies are crucial for treating chromium-polluted water sources.
Purpose of the Study:
- To synthesize and evaluate resin supported nanoscale zero-valent iron (R-nZVI) for chromium removal.
- To investigate the factors influencing Cr(VI) removal efficiency by R-nZVI.
- To understand the removal mechanisms for both Cr(VI) and Cr(III).
Main Methods:
- Synthesis of R-nZVI via borohydride reduction.
- Batch experiments to optimize removal conditions (nZVI load, resin dose, pH, initial concentration).
- Characterization using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD).
Main Results:
- R-nZVI demonstrated significant Cr(VI) removal, achieving 84.4% efficiency at 20.0 mg/L under optimal conditions.
- SEM revealed spherical nZVI particles after reaction due to Cr(III)/Fe(III) co-precipitation.
- XRD confirmed the diminished Fe(0) content post-reaction.
- R-nZVI efficiently removed Cr(III) through ion exchange and precipitation.
Conclusions:
- R-nZVI is a promising material for effective wastewater treatment containing both Cr(VI) and Cr(III).
- The material is regenerable, offering a sustainable remediation solution.
- Distinct removal mechanisms for Cr(VI) (reduction) and Cr(III) (ion exchange/precipitation) were identified.
