Abstract
Zinc oxide (ZnO) nanoparticles (NPs) have been widely investigated for applications in photocatalytic degradation of organic pollutants in wastewater. Despite the advantages of robust ZnO material, its photocatalytic activity is greatly affected by environmental factors. Halogen ions are commonly found in wastewater, which directly affect the pollutant aggregation and sedimentation, therefore it is necessary to discuss their effect on the photocatalytic degradation. The current study assesses the halogen ions effect on the photocatalytic degradation of bisphenol A (BPA) using different dosage of sodium chloride (NaCl) and sodium bromide (NaBr). The microstructural characterization of ZnO NPs was conducted by transmission electron microscopy and hydrodynamic size was analyzed through dynamic light scattering. The effective BPA degradation with ZnO NPs was observed and pseudo-first-order kinetics was calculated. The increase of ZnO NPs dosage from 10 to 100 mg L− 1 enhanced the degradation rate constant of BPA up to 0.089 min− 1 (14.8 folds). In order to evaluate the role halogen ions to degrade BPA, NaBr and NaCl were used. The degradation rate was reduced to 0.0034 min− 1 after the addition of NaBr due to the increase in hydrodynamic particle size, thereby restricting the light adsorption capacity. Noteworthy, upon addition of NaCl up to 500 mM concentration, only a slight decrease on BPA degradation rate was observed. Therefore, this study unveils the role of chloride ions as an effective medium for BPA degradation by ZnO NPs, without aggregation, and provides a novel platform for the treatment of organic pollutants in saline water.
Highlights
World-wide contamination of phenolic compounds in aquatic environmental has attracted increasing attentions in the research society
The current study demonstrates the effect of inorganic ions on the photocatalytic degradation of Bisphenol A (BPA) using Zinc oxide (ZnO) NPs under UV light irradiation
ZnO NPs aggregation was further analyzed by dynamic light scattering (DLS) (Fig. 1c), depicts the average particle size of ZnO NPs in water is about 250 nm after sonication
Summary
World-wide contamination of phenolic compounds in aquatic environmental has attracted increasing attentions in the research society. Bisphenol A (BPA) used as basic monomer in the synthesis of brominated flame retardants, epoxy resins and polycarbonates due to which it became the highest produced chemical worldwide [1] Their characteristics, environmental distribution and adverse effect on human health remain lessknown compared to conventional pollutants with the worldwide demand dramatically increasing [2]. BPA is one of the endocrine disruptors due to its genotoxic and Treatment of contaminated wastewater has received increasing attention Several techniques such as chemical oxidation [8], sono-photo-Fenton oxidation [9], UV-. Various studies suggest that chemical reduction, advanced oxidation and electrochemical processes are desired and effective treatment procedure for BPA, which could be activated by using expensive and noble metal catalysts [24]. NZVI has been exploited in last 4 decades for wastewater treatment but agglomeration due to intrinsic magnetic properties and quick aerial oxidation of NZVI remain the major challenges [26]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
