CaCu3Ti4O12, an efficient catalyst for ibuprofen removal by activation of peroxymonosulfate under visible-light irradiation

Abstract

et al.. CaCu3Ti4O12, an efficient catalyst for ibuprofen removal by activation of peroxymonosulfate under visible-light irradiation. AbstractContamination of waters by pharmaceuticals is a major health issue. Therefore, there is a need for efficient techniques to remove pharmaceutical pollutants. Here, a photo-assisted fenton-like method based on sulfate radicals was tested using CaCu 3 Ti 4 O 12 with different morphologies as catalyst. Sintering of CaCu 3 Ti 4 O 12 at 775 °C for 6 h produced cubic structures with sizes from 2 to 5 μm, whereas sintering for 14 h produced microfibers, according to scanning electron microscopy. The highest electron paramagnetic resonance signal was observed for 6-h sintering. We evaluated the catalytic efficiency of CaCu 3 Ti 4 O 12 for ibuprofen degradation with peroxymonosulfate under visible light. Results show that CaCu 3 Ti 4 O 12 and 0.5 mM peroxymonosulfate under visible-light irradiation induced 91.8% removal of ibuprofen in 60 min. The Cu + vacancy on the surface of CaCu 3 Ti 4 O 12 is essential to activate the sulfate radicals by forming a Cu + -Cu 2+ redox couple, which led to the rapid and efficient removal of ibuprofen.

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

“…Zhu et al . tested the photo‐assisted fenton‐like process based on sulfate radicals using CaCu 3 Ti 4 O 12 as catalyst to remove pharmaceutical pollutants (ibuprofen) from water.…”

“…Zhu et al [117] tested the photo-assisted fenton-like process based on sulfate radicals using CaCu 3 Ti 4 O 12 as catalyst to remove pharmaceutical pollutants (ibuprofen) from water. Fenton-like process is based on sulfate radicals (SO 4 * À ), in which sulfate radicals with higher oxidative potential (2.5-3.1 V) exhibit a higher oxidation power compared with hydroxyl radicals.…”

Porous calcium copper titanate electrodes for paracetamol degradation by electro-oxidation via CuO-induced peroxymonosulfate activation

“…Indeed, Cu + –Cu 2+ and Cu 2+ –Cu 3+ redox pairs promote ˙SO 4 − generation via PMS activation. 46–48 Hence, compared with other transition metal oxides, copper oxide (CuO) is one of the most effective catalysts for decomposing PMS into ˙SO 4 − , with low cost and limited toxicity. 49 Li et al used CuO (obtained using an easy, single-step hydrothermal approach) to activate PMS for removing acid orange AO7 dye.…”

Synthesis of CaxCu3-xTi4O12 Perovskite Materials and House-Hold LED Light Mediated Degradation of Rhodamine Blue Dye

“…[18]. Zhu and his co-workers studied the removal of ibuprofen in presence of CCTO catalyst under visible light irradiation [39]. Kushwaha's group studied the photocatalytic property of a composite of polyaniline and CCTO in the degradation of congo red and methyl orange under the illumination of a visible light source [17].…”