Optimized photodegradation of Bisphenol A in water using ZnO, TiO<sub>2</sub> and SnO<sub>2</sub> photocatalysts under UV radiation as a decontamination procedure

Abstract

Abstract. Experiments on photodegradation of Bisphenol A (BPA) were carried out in water samples by means photocatalytic and photo-oxidation methods in the presence of ZnO, TiO 2 and SnO 2 catalysts. The objective of this study was to develop an improved technique that can be used as a remediation procedure for a BPAcontaminated surface water and groundwater based on the UV solar radiation. The photodegradation of BPA in water performed under a low-intensity UV source mimics the UVC and UVA spectrum of solar radiation between 254 and 365 nm. The archived results reveal higher degradation rates observed in the presence of ZnO than with TiO 2 and SnO 2 catalysts during 20 h of irradiation. The intervention of the advanced photocatalytic oxidation (PCO) reduces the time of degradation to less than 1 h to reach a degradation rate of 90 % for BPA in water. The study proposes the use of ZnO as a competitor catalyst to the traditional TiO 2 , providing the most effective treatment of contaminated water with phenolic products.

Photocatalytic degradation of Dyes in Water by Analytical Reagent Grade Photocatalysts – A comparative study

“…(ZnO) have been applied in heterogeneous photocatalysis (Xu et.al., 2013;Herrmann, 1999). The most of these semiconductors are wide band gap semiconductors, thus promote photocatalysis by UV radiation of the electromagnetic spectrum (Lin and Lin, 2007;Abo et. al., 2016).…”

Photocatalytic degradation of dyes in water by analytical reagent grades ZnO, TiO<sub>2</sub> and SnO<sub>2</sub>: a comparative study

“…In our study, SnO 2 exhibited a relatively low activity because of its wide band gap (3.64 eV). Since a wide band gap photocatalyst needs a large amount of UV radiation to excite electrons and to form electron-hole pairs in the catalyst (Sakthivel et al, 2003;Abo et al, 2016). ZnO and TiO 2 exhibited comparable band gaps (3.24 and 3.20 eV, respectively).…”

“…Recently, many semiconductors, such as SnO 2 , WO 3 , TiO 2 , CeO 2 , and ZnO, have been used in heterogeneous photocatalysis (Xu et al, 2013;Herrmann, 1999). Most of these semiconductors are wide-band-gap semiconductors, which require ultraviolet (UV) irradiation for photocatalysis (Lin and Lin, 2007;Abo et al, 2016). When a wide-band-gap photocatalyst is irradiated with light of energy equal to or higher than its band-gap energy, electron-hole pairs are created.…”

“…In the category of semiconductor photocatalysts TiO 2 and ZnO have been widely investigated D. R. Shinde et al: Photocatalytic degradation of dyes in water (Pardeshi and Patil, 2008;Parida and Parija, 2006). TiO 2 is generally considered to be a non-toxic, chemically inert, and photo-stable catalyst, and it has the ability to degrade dyes as well as several organic pollutants (Hu et al, 2013;Zhou et al, 2011;Akpan and Hameed, 2009). The Degussa P-25 photocatalyst (mixture of anatase and rutile TiO 2 ) exhibited significantly higher photocatalytic activity in organic dye degradation than do other commercially used forms of TiO 2 (Lydakis-Simantiris et al, 2010;Zhou et al, 2012;Hou et al, 2015).…”

Removal of Methylene Blue by Activated Glass Foams with TiO2 in Dark and Simulated Solar Light

“…Titanium dioxide is a type of n semiconductor that absorbs photons in the UVA domain, which limits its application in solar power systems; however, TiO 2 photocatalytic systems with artificial UV sources have been applied for water decontamination, facilitated direct light absorption [4]. The use of TiO 2 -coated foam glass in degradation processes of pollutants in wastewater is just beginning, but it is a way of ensuring the implementation of results in large-scale industrial processes.…”