Effective and Efficient Porous CeO2 Adsorbent for Acid Orange 7 Adsorption
Yaohui Xu1,2, Liangjuan Gao3, Jinyuan Yang1
1Laboratory for Functional Materials, School of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614004, China.
Materials (Basel, Switzerland)
|April 13, 2023
Summary
A novel porous cerium oxide (CeO2) was synthesized using an eco-friendly, template-free hydrothermal method. This material efficiently removes acid orange 7 (AO7) dye from wastewater, demonstrating high adsorption capacity and recyclability.
Area of Science:
- Materials Science: Synthesis and characterization of advanced porous materials.
- Environmental Science: Development of adsorbents for wastewater treatment.
- Nanotechnology: Application of cerium oxide nanomaterials.
Background:
- Wastewater contamination by industrial dyes poses significant environmental challenges.
- Development of efficient and sustainable adsorbents is crucial for dye removal.
- Cerium oxide (CeO2) exhibits potential for adsorption applications but requires optimized synthesis strategies.
Purpose of the Study:
- To synthesize a porous cerium oxide (CeO2) material using a template-free hydrothermal method.
- To evaluate the adsorption efficiency of the synthesized porous CeO2 for acid orange 7 (AO7) dye.
- To establish optimal synthesis parameters and assess the adsorbent's performance and recyclability.
Main Methods:
- Template-free hydrothermal synthesis of porous CeO2 using guanidine carbonate and hydrogen peroxide.
- Optimization of synthesis parameters (reagent amounts, hydrothermal conditions) based on AO7 dye adsorption efficiency.
- Adsorption experiments to determine adsorption capacity, kinetics, and recyclability using NaOH for desorption.
Main Results:
- A porous CeO2 material was successfully synthesized via a template-free hydrothermal route.
- The adsorbent achieved over 90.0% removal efficiency for AO7 dye (up to 97.5% at 100 mg/L initial concentration).
- Adsorption equilibrium was reached within 30 minutes, with a maximum adsorption capacity of 90.3 mg/g and maintained >92.5% efficiency after five cycles.
Conclusions:
- The developed template-free hydrothermal strategy offers an energy-saving and emission-reducing approach for synthesizing porous CeO2.
- Porous CeO2 is a highly effective and recyclable adsorbent for the removal of AO7 dye from wastewater.
- This study presents a viable alternative adsorbent and a scalable synthesis method for CeO2-based materials in environmental remediation.
