Assessment of the use of red mud as a catalyst for photodegradation of bisphenol A in wastewater treatment

Assessment of the use of red mud as a catalyst for photodegradation of bisphenol A in wastewater treatment

Author Busto, Raquel Vieira Google Scholar
Goncalves, Maraisa Autor UNIFESP Google Scholar
Gomes Coelho, Lucia Helena Google Scholar
Abstract This study aimed to investigate the use of red mud (RM) - a byproduct of aluminum production, as a photocatalyst, which was characterized physical-chemically and used in the photodegradation of the target compound bisphenol A (BPA). Chemical processing was performed in the RM (acid treatment, chemical reduction and calcination) to verify the most active catalyst. From the results obtained, a complete degradation kinetics of BPA was carried out using a synthetic matrix (BPA in deionized water) and a real matrix (BPA in wastewater) using natural RM/calcined and TiO2 for comparison. The results indicated the potential use of the RM/calcined, which was able to degrade between 88 and 100% of the pollutant in a synthetic sample. Tests on a real effluent sample resulted in degradation rates that ranged from 59 to 100% with chemical oxygen demand reductions of up to 23% using natural RM/calcined in comparison to TiO2. The blank system (irradiation of the solution without the use of a photocatalyst) and the natural RM/calcined one, resulted in reductions of the toxicity in the effluent sample (measured by EC20 using the marine bacteria Vibrio fischeri) of about 12 times, whereas the same treatment using TiO2 resulted in a toxicity reduction of only seven times. Within these results, the RM/calcined showed potential to be used in wastewater treatment in polishing processes.
Keywords advanced oxidation processes
bisphenol A
photocatalysis
red mud
Language English
Sponsor CAPES
CNPq
Date 2016
Published in Water Science And Technology. London, v. 74, n. 6, p. 1283-1295, 2016.
ISSN 0273-1223 (Sherpa/Romeo, impact factor)
Publisher Iwa Publishing
Extent 1283-1295
Origin http://dx.doi.org/10.2166/wst.2016.309
Access rights Closed access
Type Article
Web of Science ID WOS:000384222200004
URI http://repositorio.unifesp.br/handle/11600/51095

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