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Effect of operational parameters on photocatalytic degradation of ethylparaben using rGO/TiO composite under UV radiation. | LitMetric

Effect of operational parameters on photocatalytic degradation of ethylparaben using rGO/TiO composite under UV radiation.

Environ Res

Department of Inorganic and Organic Chemistry, Faculty of Experimental Science, University of Jaén, 23071, Jaén, Spain. Electronic address:

Published: September 2021

AI Article Synopsis

  • - The study examines how various factors (like catalyst amount, EtP concentration, pH, and the presence of certain ions) affect the breakdown of ethylparaben (EtP) when using a specific catalyst (rGO/TiO composite).
  • - It was found that longer alkyl chains in parabens improve their breakdown rates, and increasing the catalyst dose significantly enhances EtP removal, but there's a limit to the effectiveness beyond a certain dose.
  • - Higher EtP concentrations and solution pH lower the effectiveness of degradation, while the presence of some anions decreases performance; however, the degradation process does not yield harmful byproducts.

Article Abstract

The objective of this study was to analyze the influence of different operational variables (catalyst loading, initial EtP concentration, medium pH, the presence of anions and radical scavengers) on the performance of ethylparaben (EtP) photodegradation catalyzed with an rGO/TiO composite. EtP was selected for study after analyzing the effect of paraben chain length on its catalytic photodegradation, finding that the photodegradation rate constant values of methyl-, ethyl-, and butyl-paraben are 0.050, 0.096, and 0.136 min, respectively. This indicates that the photodegradation rate constant of parabens is higher with longer alkyl chain, which augments its oxidation capacity. The percentage removal of EtP at 40 min increases from 66.3 to 98.6 % when the composite dose rises from 100 to 700 mg/L; however, an additional increase in the composite dose to 1000 mg/L does not substantively improve the photodegradation rate or percentage EtP removal (98.9 %). A rise in the initial EtP concentration from 15 to 100 mg/L reduces the percentage of degradation from 100 to 76.4 %. The percentage EtP degradation is lower with higher solution pH. The presence of HCO or Cl anions in the medium reduces the degradation performance. Results obtained using positive hole and hydroxyl radical scavengers demonstrate that positive holes play an important role in EtP degradation. No degradation product evidences toxicity against the cultured human embryonic kidney cell line HEK-293.

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Source
http://dx.doi.org/10.1016/j.envres.2021.111750DOI Listing

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