Kinetics of the Photocatalytic Decomposition of Bisphenol A on Modified Photocatalysts

Abstract

This paper presents the evaluation of the photocatalytic kinetics of bisphenol A decomposition in the presence of commercial titanium(IV) oxide and modified photocatalysts (composites). The following modification methods were used: mechanical mixing, calcination and impregnation. The decomposition process was carried out with the addition of photocatalysts and activated carbon at doses of 100 mg/dm 3 and 25 mg/dm 3 , respectively. The photocatalytic process was performed in a reactor from the Heraeus Company (Warsaw, Poland) with a volume of 0.7 dm 3. The reactor was equipped with an immersed medium-pressure mercury lamp with a power of 150 W (λ = 200-580 nm). The degree of bisphenol A decomposition was determined by chromatographic analysis preceded by solid-phase extraction SPE. The qualitative-quantitative analysis was performed using a high-performance liquid chromatograph HPLC (UV detector, λ = 218 nm) from Varian (Warsaw, Poland). The dependence of the BPA decomposition on the duration of irradiation was found, wherein the modified photocatalysts were the most effective (from 75 to 90% after 15 minutes). The order of photocatalyst efficiency has been proposed as follows: TiO 2 < TiO 2 /AC < C dextran-TiO 2 /AC < C methanol-TiO 2 /AC< C ethanol-TiO 2 /AC < TiO 2-AC. The highest degree of decomposition was observed in the presence of TiO 2 /AC (99%). Numerous studies suggest that the results of the TiO 2 photocatalytic oxidation of organic substances fit well with the Langmuir-Hinshelwood (L-H) kinetic model. The kinetic parameters of the photocatalysis process were carried out according to the L-H model. According to the pseudo-first-order parameters, the results showed that the decomposition of bisphenol A was most intensive in the first 15 minutes of the process.

Synthesis and Characterization of Zinc Oxide-Zeolite Photocatalyst Nanocomposite for Heavy Metals Degradation

“…On the other hand, holes will oxidize the hydroxyl to produce a radical with more energy large, such as hydroxyl radicals. These hydroxyl radicals will break down contaminants organic into harmless green compounds that are environmentally friendly (Zawadzki et al, 2018). This statement is in accordance with a research review by Ong Comparison of degradation values at optimum conditions using a UV lamp and without a UV lamp at different pH (pH 6-8) can be seen in Figure 4 and 5.…”

“…Heavy metals Cu, Fe, and Pb reported the highest degradation percentages after 60 minutes under optimal conditions using ultraviolet radiation. The primary chemical characteristic of the photocatalytic process is the generation of hydroxyl radicals, which act as oxidizers for organic contaminants (Zawadzki et al, 2018). Previous study by Prasetyaningrum et al (2020) has shown that the use of UV irradiation treatment can significantly boost the reduction of heavy metal pollutants, such as copper (Cu), ion electroplating wastewater by around fifty percent.…”

Preparation and Characterization of ZnO-Zeolite Nanocomposite for Photocatalytic Degradation by Ultraviolet Light

“…Photocatalysis with the combination of the ZnO photocatalyst and synthetic zeolite adsorbent is more effective and the result of pollutant degradation is maximized. The common chemical feature in the photocatalytic process is the hydroxyl radicals formation as an oxidizer of organic pollutants (Zawadzki et al, 2018). The photodegradation method is cheaper and easy to apply (Agustina et al, 2020).…”

Degradation Efficiency and Kinetics Analysis of an Advanced Oxidation Process Utilizing Ozone, Hydrogen Peroxide and Persulfate to Degrade the Dye Rhodamine B

“…Satisfactory fitting (60-80%) was obtained only for the H 2 O 2 process, as a result of the very low RhB degradation effectiveness (under 1%). A phenomenon characteristic of advanced oxidation processes is the occurrence of (typically) two time intervals for the conducted oxidation reactions [38]. Other authors [39,40] observed a similar phenomenon as well, resulting most likely from the indirect reactions of oxidizing components with the pollutant degradation products.…”