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Goethite/montmorillonite adsorption coupled with electrocoagulation for improving fluoride removal from aqueous
Jiali Kang1, Junfeng Li1, Chengxiao Ma1
1School of Water Conservancy and Architectural Engineering, Shihezi University Shihezi 832000 PR China ljfshz@126.com.
RSC Advances
|April 15, 2022
Summary
A novel goethite-montmorillonite-sorbent (GMS) combined with electrocoagulation (EC) effectively removes fluoride ions. The EC/GMS method achieves high fluoride removal efficiency and low energy consumption, offering a sustainable solution for water treatment.
Area of Science:
- Environmental Science
- Materials Science
- Water Treatment Technologies
Background:
- Fluoride pollution poses a significant environmental and health challenge.
- Efficient and cost-effective methods for fluoride removal are urgently needed.
- Existing methods often face limitations in efficiency or sustainability.
Purpose of the Study:
- To develop and evaluate a novel electrocoagulation combined with goethite-montmorillonite-sorbent (EC/GMS) process for fluoride removal.
- To investigate the performance, mechanism, and reusability of the EC/GMS system.
- To optimize the fluoride removal process for practical applications.
Main Methods:
- Preparation and characterization of goethite-montmorillonite-sorbent (GMS) using SEM, BET, FT-IR, and XPS.
- Experimental investigation of fluoride removal using the EC/GMS pathway.
- Optimization of removal efficiency using single-factor and Response Surface Methodology (RSM) - Box-Behnken Design (BBD) experiments.
- Cyclic experiments to assess material reusability and kinetic analysis.
Main Results:
- GMS material provides abundant adsorption sites for fluoride ions.
- The EC/GMS process achieved a high fluoride removal efficiency of 95.98% initially and up to 99.47% after optimization.
- The system demonstrated low energy consumption (0.58 kWh m⁻³) and maintained over 87% removal efficiency after six cycles.
- Kinetic analysis confirmed rapid fluoride removal, even from high-concentration solutions.
Conclusions:
- The developed EC/GMS pathway is a highly efficient and reusable method for removing fluoride from aqueous environments.
- The combined electrocoagulation and adsorption mechanism, enhanced by GMS, significantly improves fluoride removal.
- This study presents a promising and sustainable approach for addressing fluoride pollution in water treatment.
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