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Effect of phosphoric acid treatment on kaolinite supported ferrioxalate catalyst for the degradation of amoxicillin in batch photo-Fenton process
Abstract The effects of phosphoric acid treatment on kaolinite (Kaol) as catalyst support were investigated in this study. The results showed that as the acid concentration was increased from 5 to 10M, there was increment in the specific surface area from 18.78 in Kaol to 36.0 and 145.5m2 g−1 in 5M acid treated Kaol supported catalyst (5M-AT-KaolCat) and 10M acid treated Kaol supported catalyst (10M-AT-KaolCat), respectively. Characterization results showed that 10M-AT-KaolCat has higher percentage of Fe than the 5M-AT-KaolCat due to the effect of acid treatment which provided larger surface area for its anchoring. Consequently, degradation efficiency is comparably faster in 10M-AT-KaolCat with about 99% of 40ppm amoxicillin degraded in 8min without pH adjustments while it takes 12min using 5M-AT-KaolCat. The degradation process showed initial enhanced degradation efficiency with increase in the catalyst loadings which later decreased due to the scavenging effect of excess catalyst loading on the reactive hydroxyl radical. The catalysts showed high resistance to leaching due to the presence of the ferrioxalate (FeOx) ligands and the effect of phosphoric acid modification which introduces monolayer of phosphate functional group on the catalyst support through which the FeOx ligands were properly anchored.
Highlights ► Treatment of kaolinite with 5M and 10M phosphoric acid as catalyst support ► Incorporation of ferrioxalate precursor into acid treated kaolinite samples ► Characterization of kaolinite, treated kaolinite samples and ferrioxalate catalysts ► Degradation of amoxicillin with treated kaolinite supported ferrioxalate catalysts ► Reusability studies on the acid treated kaolinite supported ferrioxalate catalysts
Effect of phosphoric acid treatment on kaolinite supported ferrioxalate catalyst for the degradation of amoxicillin in batch photo-Fenton process
Abstract The effects of phosphoric acid treatment on kaolinite (Kaol) as catalyst support were investigated in this study. The results showed that as the acid concentration was increased from 5 to 10M, there was increment in the specific surface area from 18.78 in Kaol to 36.0 and 145.5m2 g−1 in 5M acid treated Kaol supported catalyst (5M-AT-KaolCat) and 10M acid treated Kaol supported catalyst (10M-AT-KaolCat), respectively. Characterization results showed that 10M-AT-KaolCat has higher percentage of Fe than the 5M-AT-KaolCat due to the effect of acid treatment which provided larger surface area for its anchoring. Consequently, degradation efficiency is comparably faster in 10M-AT-KaolCat with about 99% of 40ppm amoxicillin degraded in 8min without pH adjustments while it takes 12min using 5M-AT-KaolCat. The degradation process showed initial enhanced degradation efficiency with increase in the catalyst loadings which later decreased due to the scavenging effect of excess catalyst loading on the reactive hydroxyl radical. The catalysts showed high resistance to leaching due to the presence of the ferrioxalate (FeOx) ligands and the effect of phosphoric acid modification which introduces monolayer of phosphate functional group on the catalyst support through which the FeOx ligands were properly anchored.
Highlights ► Treatment of kaolinite with 5M and 10M phosphoric acid as catalyst support ► Incorporation of ferrioxalate precursor into acid treated kaolinite samples ► Characterization of kaolinite, treated kaolinite samples and ferrioxalate catalysts ► Degradation of amoxicillin with treated kaolinite supported ferrioxalate catalysts ► Reusability studies on the acid treated kaolinite supported ferrioxalate catalysts
Effect of phosphoric acid treatment on kaolinite supported ferrioxalate catalyst for the degradation of amoxicillin in batch photo-Fenton process
Ayodele, Olumide Bolarinwa (author)
Applied Clay Science ; 72 ; 74-83
2013-01-07
10 pages
Article (Journal)
Electronic Resource
English