Efficient removal of the recalcitrant metamizole contaminant from drinking water by using a CaLaCoO_(9) perovskite supported on recycled polyethylene  

作　　者：Ernesto Valadez-Renteria Christian Perez-Carrasco Dulce Yolotzin Medina-Velazquez Vicente Rodriguez-Gonzalez Jorge Oliva 

机构地区：[1]CONACYT-División de Materiales Avanzados,Instituto Potosino de Investigación Científica y Tecnológica A.C.,San Luis Potosí,SLP 78216,México [2]División de Ciencias Básicas e Ingeniería,Universidad Autónoma Metropolitana Azcapotzalco,Col.Reynosa-Tamaulipas,C.P.,México,DF 02200,México

出　　处：《Journal of Environmental Sciences》2024年第2期56-67,共12页环境科学学报（英文版）

基　　金：the financial support awarded by the CATEDRAS-CONACYT program。

摘　　要：Metamizole(MZ)is a widely used anti-inflammatory drug.Due to its common use,this contaminant is found in sewage and rivers.In order to reduce the contamination produced by the MZ,we fabricated in this work a photocatalytic composite using recycled polyethylene(RPE)and the CaLaCoO_(9)(LCCO)perovskite.Those nanoparticles had a microplate-like morphology and sizes of 1.4–5.5μm according to the analysis of microscopy.The photocatalytic properties of the LCCO powders were evaluated under ultraviolet-visible(UV-Vis)irradiation and found a removal efficiency of 96%.When the RPE+LCCO composite was employed for the photocatalytic degradation of MZ,a maximum degradation of 92.5%was obtained.The influence of the pH on the photocatalytic activity was also studied and found that an initial pH=3 produced a total degradation of MZ after 240 min of UV-Vis irradiation.Moreover,three reuse cycles were carried out for the pure LCCO powders and for the RPE+LCCO composites and found that the maximum loss of degradation was 5%.Furthermore,scavenger experiments demonstrated that the super oxide and hydroxyl radicals are formed during the photocatalytic reaction and were responsible for the degradation of MZ.Additionally,the X-ray photoelectron-spectroscopy and Raman analysis demonstrated the formation of defects(oxygen vacancies),those ones delayed the electron-hole recombination,which in turn,enhanced the degradation of the MZ.Thus,the studies performed in this work proved that composites made with recycled plastics and LCCO perovskites are a low-cost and feasible alternative for the cleaning of water sources polluted with pharmaceutical compounds.

关 键 词：Photocatalysis Metamizole Pharmaceutical contaminant UV-Vis irradiation PEROVSKITE 

分 类 号：TU991.21[建筑科学—市政工程] O643.36[理学—物理化学] O644.1[理学—化学]