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Enhanced adsorption of uranium by modified red muds: adsorption behavior study
Wanying Wu1, Diyun Chen1, Jinwen Li1
1Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 51006, China.
Environmental Science and Pollution Research International
|April 26, 2018
Summary
Modified red mud effectively removes hazardous uranium from wastewater. Ferric nitrate modified red mud (FRM) achieved 98.75% removal efficiency, demonstrating superior performance and anti-interference capabilities for environmental remediation.
Area of Science:
- Environmental Science
- Materials Science
- Chemistry
Background:
- Uranium contamination in wastewater poses significant environmental and health risks.
- Advanced functional materials and reliable technologies are crucial for effective uranium removal.
- Red mud, a low-cost industrial byproduct, shows potential as an adsorbent material.
Purpose of the Study:
- To develop highly efficient adsorbents for uranium removal from wastewater by modifying raw red mud.
- To evaluate the adsorption performance of modified red muds, specifically nitric acid dealkalized red mud (DRM), aluminum nitrate modified red mud (ARM), and ferric nitrate modified red mud (FRM).
- To investigate the adsorption mechanisms and influencing factors for uranium removal using these modified materials.
Main Methods:
- Raw red mud was modified through nitric acid dealkalization (DRM), aluminum nitrate treatment (ARM), and ferric nitrate treatment (FRM).
- Adsorption efficiencies of uranium(VI) were determined for DRM, ARM, and FRM under optimal conditions.
- Adsorption kinetics, mechanisms (chemisorption vs. physical adsorption), and interference effects (carbonate, calcium) were analyzed.
Main Results:
- Modified red muds exhibited high uranium(VI) adsorption efficiencies: DRM (74.50%), ARM (95.56%), and FRM (98.75%).
- FRM demonstrated superior adsorption capacity and faster equilibrium time (30 min) compared to DRM and ARM (10 min).
- FRM showed enhanced anti-interference ability against carbonate and calcium ions, crucial for real wastewater treatment.
Conclusions:
- Modified red muds, particularly FRM, are highly effective and low-cost adsorbents for uranium removal from wastewater.
- The enhanced adsorption is attributed to improved ion exchange, co-precipitation, and electrostatic attraction facilitated by red mud's modified components.
- These findings highlight the potential of utilizing modified red mud for sustainable environmental remediation of radioactive contaminants.
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