LED-assisted Photocatalytic Degradation of Diclofenac by heterojunction Mn-doped tungsten oxide (Mn-WO3) nanoparticles from aqueous solutions: Degradation pathway, Dechlorination mechanism and toxicity bioassay evaluation
کد مقاله : 1145-IWWA
moayed Adiban *
عضو هیئت علمی
چکیده مقاله:
This study was aimed to explore of the photocatalytic degradation and mineralization of diclofenac (DCF) by a Mn-WO3/LED process in an LED photoreactor. The effects of operational parameters such as catalyst dosage, pH, initial DCF concentration and reaction time on the efficiency of Mn-WO3/LED process was investigated. Toxicity assays were also performed with both raw and treated DCF solutions by Daphnia Magna. The Mn-WO3 nanoparticle was characterized by various analytical procedures including XRD, FESEM, TEM, FTIR, BET and TGA. In addition, complete degradation of DCF was achieved at solution pH of 7, photocatalyst dosage of 2.2 g L-1 and reaction time of 70 min. Decomposition mechanism indicated that the remarkable ability of HO• free radicals was the main factor responsible for degradation of DCF in the Mn-WO3 process under LED irradiation. The mineralization of DCF in optimal conditions reached to 74% and 88% within 90 and 180 min, respectively. The presence of main anions in water did not considerably influence on the DCF decomposition. Moreover, degradation intermediates of DCF were finally turn up to simple substances such as maleic acid and Phenol. The toxicity analysis showed that the treated DCF aqueous sample was significantly reduced compared to the raw solution. The electrical energy per order (EEO) indicated that energy consumption in the studied process was lower than that in other studies. Therefore, the Mn-WO3 process with LED photoreactor is an emerging, cost-effective and attainable process which can be successfully applied to degrade and mineralize the medical drugs such as DCF.
کلیدواژه ها:
Diclofenac; Mn-doped tungsten oxide; LED Degradation pathway; Dechlorination; and Toxicity
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