Abstract
The fundamentals of silicic acid sorption on customized metal organic frameworks (MOFs) synthesized with green chemistry was investigated. The authors appraised the influence of pH, contact time, initial concentration of silicic acid as SiO2 on the sorption effectiveness. In-situ Raman tests confirm that hydroxyl group was involved in the silicic acid sorption process. Batch tests demonstrate that the pseudo-second order kinetic model and Freundlich isotherm model best describe the silicic acid sorption on the MOF-Al while the pseudo-second order kinetic model and Langmuir isotherm model can best describe the sorption on the MOF-Fe and MOF-Cu. The maximum experimental silicic acid sorption capacity was 182.2 mg SiO2/g for MOF-Al, 157.7 mg SiO2/g for MOF-Fe and 201.4 mg SiO2/g for MOF-Cu. The MOF-Fe and MOF-Cu are the most promising variation as they represent the most robust materials tested.
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