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• W4210353007 endingPage "4571" @default.
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• W4210353007 abstract "Fine activated alumina (FAA) acting as an adsorbent for phosphate was synthesized from an industrial sodium aluminate solution based on phase evolution from Al(OH)3 and NH4Al(OH)2CO3. This material was obtained in the form of γ-Al2O3 with an open mesoporous structure and a specific surface area of 648.02 m2 g-1. The phosphate adsorption capacity of the FAA gradually increased with increases in phosphate concentration or contact time. The maximum adsorption capacity was 261.66 mg g-1 when phosphate was present as H2PO4- at a pH of 5.0. A removal efficiency of over 96% was achieved in a 50 mg L-1 phosphate solution. The adsorption of phosphate anions could be explained using non-linear Langmuir or Freundlich isotherm models and a pseudo-second-order kinetic model. Tetra-coordinate AlO4 sites acting as Lewis acids resulted in some chemisorption, while (O) n Al(OH)2+ (n = 4, 5, 6) Brønsted acid groups generated by the protonation of AlO4 or AlO6 sites in the FAA led to physisorption. Analyses of aluminum-oxygen coordination units using Fourier transform infrared and X-ray photoelectron spectroscopy demonstrated that physisorption was predominant. Minimal chemisorption was also verified by the significant desorption rate observed in dilute NaOH solutions and the high performance of the regenerated FAA. The high specific surface area, many open mesopores and numerous highly active tetra-coordinate AlO4 sites on the FAA all synergistically contributed to its exceptional adsorption capacity." @default.
• W4210353007 created "2022-02-08" @default.
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• W4210353007 date "2022-01-01" @default.
• W4210353007 modified "2023-09-25" @default.
• W4210353007 title "Enhanced phosphate removal with fine activated alumina synthesized from a sodium aluminate solution: performance and mechanism" @default.
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• W4210353007 doi "https://doi.org/10.1039/d1ra08474g" @default.
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