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| Simultaneous removal of phosphate and fluoride from acid wastewater by Ce-La bimetal oxides: Performance and mechanism |
| LI Han1, ZHAO Yu1, CHEN Jia-chao1, XU Hai-min2, ZHU Ya-xian1, CHEN Zhi-hui1, SHEN Meng-meng1, YANG Wen-lan1,2 |
1. School of the Environmental Science and Engineering, Yangzhou University, Yangzhou 225127;
2. Jiangsu Qichuang Environmental Science and Technology Co., LTD., Yixing 214264 |
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Abstract A novel Ce-La bimetal oxides nano-adsorbent (CLBOs) capable of simultaneous phosphate and fluoride removal from water was successfully synthesized by coprecipitation method. The CLBOs existed primarily as nanoparticles or nanoclusters, with a particle size range of 20~50nm and a specific surface area of 117.9m2/g. Notably, the CLBOs displayed excellent chemical stability across a wide pH range (4~12), with acidic conditions proving beneficial for the adsorption of phosphate and fluoride. Under experimental condition of pH 4.0and initial concentrations of 30mg/L for phosphate and 10mg/L for fluoride, the CLBOs exhibited a remarkable maximum adsorption capacity of 59.14mg/g for phosphate and 19.25mg/g for fluoride. This outstanding adsorption performance was attributed to the combined effects of electrostatic attraction, ligand exchange, and inner-sphere complexation. Furthermore, the presence of competing anions had minimal impact on the removal efficiency of CLBOs. The adsorption process of phosphate and fluoride onto CLBOs followed a pseudo-second-order kinetic model, with fluoride being adsorbed significantly faster than phosphate. Equilibrium was achieved in approximately 100 minutes for fluoride and 240 minutes for phosphate. Importantly, the exhausted CLBOs could be efficiently regenerated through a simple alkaline treatment, enabling their cyclic utilization while maintaining consistent adsorption performance. In conclusion, the results demonstrate that CLBOs is a highly efficient adsorbent with significant potential for practical applications in the simultaneous removal of phosphate and fluoride from wastewater.
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Received: 05 March 2023
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