Abstract
To solve the problems such as water eutrophication caused by excess phosphorus, the potential residual value of aluminum sludge was fully exploited and its phosphate adsorption capacity was further improved. In this study, twelve metal-modified aluminum sludge materials were prepared by co-precipitation method. Among them, Ce-WTR, La-WTR, Y-WTR, Zr-WTR, and Zn-WTR showed excellent adsorption capacity for phosphate. The adsorption performance of Ce-WTR on phosphate was twice that of the native sludge. The enhanced adsorption mechanism of metal modification on phosphate was investigated. The characterization results showed that the increase in specific surface area after metal modification was 9.64, 7.5, 7.29, 3, and 1.5 times, respectively. The adsorption of phosphate by WTR and Zn-WTR was in the accordance with Langmuir model, while the others were more following the Freundlich model (R2 > 0.991). The effects of dosage, pH, and anion on phosphate adsorption were investigated. The surface hydroxyl groups and metal (hydrogen) oxides played an important role in the adsorption process. The adsorption mechanism involves physical adsorption, electrostatic attraction, ligand exchange, and hydrogen bonding. This study provides new ideas for the resource utilization of aluminum sludge and theoretical support for preparing novel adsorbents for efficient phosphate removal.
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The dataset used and/or analyzed during this study are available from the corresponding author on reasonable request.
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Funding
This work was supported by the Scientific Innovation Practice Project of Postgraduates of Chang’an University (300103722010) and the Innovation and Entrepreneurship Training Program Innovation Training Project of College Students (G202210710067).
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Aixia Chen: writing—reviewing and editing. Juanjuan Guan: writing—original draft preparation, conceptualization. Ruirui Hu: methodology. Xiao Wei: software. Yixuan Zhang: data curation. Luxue Lv: visualization. Xinyuan Wang: investigation, supervision. Lei Zhang: investigation, supervision. Luqian Ji: investigation, supervision.
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Highlights
• Aluminum sludge disposal was combined with phosphorus pollution control.
• Five metal-modified aluminum sludge has enhanced phosphate adsorption effect.
• Ce-WTR adsorbed twice as much phosphate as the original aluminum sludge.
• The metal cations in the higher valence state are more strongly bound to phosphate.
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Chen, A., Guan, J., Hu, R. et al. Enhanced phosphate adsorption studies on several metal-modified aluminum sludge: preparation optimization, adsorption behavior, and mechanistic insight. Environ Sci Pollut Res 30, 54628–54643 (2023). https://doi.org/10.1007/s11356-023-26212-0
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DOI: https://doi.org/10.1007/s11356-023-26212-0