Visible-light activation of persulfate by nano-Fe/TiO2 photocatalyst towards efficient degradation of acid orange dye

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-03-18 DOI:10.1016/j.jwpe.2025.107495

Hongling Zhang , Xiaoyu Wang , Xiulan Pang , Guofeng Ma

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Abstract

Titanium oxide (TiO₂) semiconducting materials attracted great interest in photocatalytic degradation of organic pollutants in the treatment of textile wastewater in recent days. The present study focuses on a sol-gel method for synthesizing nano-Fe doped TiO₂ photocatalyst, and employs the advanced oxidation technique termed photocatalytic activation of persulfate to degrade azo dye. The degradation performance of targeted degradant acid orange dye (AO7) was analyzed regarding the impacts of PDS concentration, solution pH, and catalyst dose. Results showed that under visible light irradiation, the removal rate of AO7 can reach a peak of 98.40 % within 40 min at an optimal initial concentration of 0.05 g·L⁻¹, a pH of 5, a PDS concentration of 4 mM, and a catalyst dosage of 0.4 g·L⁻¹, accompanied by a reaction rate constant of 0.1152 min⁻¹. Moreover, the higher photocatalytic activity of nano-Fe/TiO₂ in comparison to pure TiO₂ is attributed to a higher specific surface area, smaller crystalline size, reduced band gap (2.54 eV), and increased efficiency for the electron-hole generation according to SEM, XRD, FTIR, XPS and DRS characterization measurements. The nano-Fe/TiO₂ photocatalytic efficiency persisted robustly after 4 runs and also had a high activity in degrading Tetracycline. The photocatalytic mechanism revealed that the persulfate radical (·SO₄⁻) and the hole (h⁺) followed by superoxide radicals (·O₂⁻) played a crucial role in providing a better photocatalytic activity under visible light irradiation. The outcomes demonstrate future possibilities of applying nano-Fe/TiO₂ photocatalyst in the treatment of organic pollutants wastewater under visible light.

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies