2018-Sustainable Industrial Processing Summit
SIPS2018
Volume 6. New and Advanced Materials and Technologies
| Editors: | F. Kongoli, F. Marquis, P. Chen, T. Prikhna, N. Chikhradze |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 392 pages |
| ISBN: | 978-1-987820-92-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Ag2WO4 Polymorphs: Easily Synthetized and Highly Efficient for Antibiotics Degradation
Roman Alvarez Roca1; Pablo Santana1; Elson Longo2;1CDMF/DPTO. QUíMICA, UFSCAR, Sao Carlos, Brazil; 2CDMF/DPTO. QUíMICA, UFSCAR, São Carlos, Brazil;
Type of Paper: Regular
Id Paper: 253
Topic: 43
Abstract:
The transition metal tungstates is an inorganic oxides family are widely used in many applications such as environmental purification, clear fuel production, etc. [1,2] Among the metal tungstates, the Silver tungstate (Ag<sub>2</sub>WO<sub>4</sub>) is applied in various fields like photocatalysts, sensors, antibacterial agents, etc [2,3]. In this work, different Ag<sub>2</sub>WO<sub>4</sub> polymorphs; alfa- (stable); and beta- and gamma- (metastables); were synthesized by a facile and low cost effective co-precipitation method. The synthesized materials were characterized by XRD, FT-IR spectroscopy, and SEM analysis. The XRD pattern reveals the formation of each Ag<sub>2</sub>WO<sub>4</sub> structure. The FT-IR and Raman analysis confirms the presence of Ag-O and W-O bonds in Ag<sub>2</sub>WO<sub>4</sub> crystals. The morphologies of the as-synthesized Ag<sub>2</sub>WO<sub>4</sub> were analyzed by SEM. Other than that, to the best of our knowledge, the reports on the photocatalytic properties of all Ag<sub>2</sub>WO<sub>4</sub> polymorphs are obtained rarely. Under UV-Vis irradiation, the photocatalytic action of each polymorph was tested for the degradation of amiloride and the photoactivity performances and degradation reactions were evaluated. Beta- Ag<sub>2</sub>WO<sub>4</sub> showed the best photocatalytic activity among the three kinds of samples, 100 % degradation within 35 min. In particular, the metastable polymorphs exhibit the highest photocatalytic activity when compared to more stable polymorphs, due to more active surfaces. All polymorphs were a durable and stable photocatalyst during recycling experiments. The present work contributes to a deeper understanding of metastable photocatalysts with high photocatalytic activity, in order to address future demands on environmental remediation.