Micro-nano bubbles in action: AC/TiO2 hybrid photocatalysts for efficient organic pollutant degradation and antibacterial activity

IF 3.4 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biocatalysis and agricultural biotechnology Pub Date : 2024-10-01 DOI:10.1016/j.bcab.2024.103400

Chakkawan Boonwan , Thammasak Rojviroon , Orawan Rojviroon , Ranjith Rajendran , Shanmugam Paramasivam , Ragavendran Chinnasamy , Sabah Ansar , Supakorn Boonyuen , Roongrojana Songprakorp

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Abstract

Developing highly active and sustainable photocatalysts is crucial for environmental remediation. This work focuses on the enhanced photocatalytic degradation efficiency of synthetic dyes using TiO₂-coated AC hybrid photocatalysts under MNB aeration. The TiO₂-coated AC hybrid photocatalyst (HP) was synthesized via a sol-gel method and characterized using XRD, FTIR, SEM, EDS, HR-TEM, and DRS. The study investigated the photocatalytic degradation of three dyes indigo carmine (IC), reactive black 5 (RB5), and methylene blue (MB) in wastewater, with initial dye concentrations ranging from 10 to 100 μM. Under UVA irradiation, the hybrid photocatalyst with MNB aeration (HP + UVA + MNB) achieved the highest degradation efficiencies of 69.09%, 60.06%, and 55.19% for IC, MB, and RB5, respectively. Further analysis showed that the chromophores and complex structures of these dyes were broken into intermediate products. The Langmuir-Hinshelwood kinetic model was used to describe the reaction mechanisms. The HP + UVA + MNB system demonstrated superior photocatalytic degradation activity, making it suitable for operational and environmental applications in dye wastewater treatment. Additionally, the antibacterial properties of AC and HP were tested at 100 μg/mL, showing effectiveness against both Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli.

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微纳米气泡在发挥作用：可高效降解有机污染物并具有抗菌活性的 AC/TiO2 混合光催化剂

开发高活性、可持续的光催化剂对于环境修复至关重要。这项工作的重点是在 MNB 曝气条件下使用 TiO2 涂层 AC 混合光催化剂提高合成染料的光催化降解效率。通过溶胶-凝胶法合成了 TiO2 涂层 AC 混合光催化剂（HP），并使用 XRD、FTIR、SEM、EDS、HR-TEM 和 DRS 对其进行了表征。该研究考察了光催化降解废水中靛蓝胭脂红（IC）、活性黑 5（RB5）和亚甲基蓝（MB）三种染料的情况，染料的初始浓度为 10 至 100 μM。在 UVA 照射下，混合光催化剂与 MNB 曝气（HP + UVA + MNB）对 IC、MB 和 RB5 的降解效率最高，分别为 69.09%、60.06% 和 55.19%。进一步的分析表明，这些染料的发色团和复杂结构被分解成了中间产物。采用 Langmuir-Hinshelwood 动力学模型来描述反应机制。HP + UVA + MNB 系统表现出卓越的光催化降解活性，使其适用于染料废水处理的操作和环境应用。此外，在 100 μg/mL 的条件下测试了 AC 和 HP 的抗菌性能，结果显示它们对革兰氏阳性金黄色葡萄球菌和革兰氏阴性大肠杆菌都有效。

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来源期刊

Biocatalysis and agricultural biotechnology Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

7.70

自引率

2.50%

发文量

308

审稿时长

48 days

期刊介绍： Biocatalysis and Agricultural Biotechnology is the official journal of the International Society of Biocatalysis and Agricultural Biotechnology (ISBAB). The journal publishes high quality articles especially in the science and technology of biocatalysis, bioprocesses, agricultural biotechnology, biomedical biotechnology, and, if appropriate, from other related areas of biotechnology. The journal will publish peer-reviewed basic and applied research papers, authoritative reviews, and feature articles. The scope of the journal encompasses the research, industrial, and commercial aspects of biotechnology, including the areas of: biocatalysis; bioprocesses; food and agriculture; genetic engineering; molecular biology; healthcare and pharmaceuticals; biofuels; genomics; nanotechnology; environment and biodiversity; and bioremediation.