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Layered double hydroxide as catalysts in heterogeneous photo Fenton process for degradation of drugs present in hospital effluent

Grant number: 18/17517-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): December 01, 2018
Effective date (End): February 28, 2021
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Raquel Fernandes Pupo Nogueira
Grantee:Nayara de Melo Costa Serge
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil

Abstract

Hospital effluents present high concentration of pharmaceutical residues, contaminants that are not totally eliminated by conventional methods of treatment of sewage. In order to eliminate these contaminants, Advanced Oxidation Processes (POA) have deserved prominence, due to the ability of the hydroxyl radical (HO*) to oxidize the organic matter to CO2, H2O and inorganic ions. This study will evaluate a new type of material as a catalyst in heterogeneous photo-Fenton process, Layered Double Hydroxide (HDL), using LED and solar radiation for the degradation of the drugs ciprofloxacin, carbamazepine and 5-fluorouracil present in hospital effluent. HDL will be synthesized with structures of the pyroaurite type (magnesium and iron hydroxycarbonate) containing different concentrations of copper and different anions interspersed in the lamellae.These will be characterized by suitable techniques in order to correlate the composition and structure to their activity. Initially the degradation of the drugs in purified water and later in the hospital effluent will be evaluated. The degradation process will be monitored by the decay of the drug concentration by High Performance Liquid Chromatography (HPLC). For the quantification of the drugs in the effluent as well as to identify the degradation products, LC-MS technique will be employed to elucidate the mechanism of degradation mediated by HDL. The mineralization of the organic contaminants present in the effluent will be evaluated by determinations of Total Organic Carbon (TOC). (AU)