Dual response of various TiO2 specimens for the solar photocatalytic inactivation of Escherichia coli and degradation of humic matter

IF 5.1 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2026-04-01 Epub Date: 2025-11-19 DOI:10.1016/j.cattod.2025.115636

Ceyda S. Uyguner-Demirel, Ezgi Lale, Miray Bekbolet

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引用次数: 0

Abstract

Solar photocatalysis is regarded as a plausible approach for degradation of micropollutants, natural organic matter and a variety of microorganisms in water. As a used photocatalyst, several modification methodologies i.e., Fe^3 + doping of TiO₂ are required to extend the light harvesting range to visible region. This study was conducted to investigate the role of bare (P-25), synthesized TiO₂ (SynTiO₂) and their respective Fe doped specimens on simultaneous degradation of organic matrix and inactivation of Escherichia coli (E. coli) in humic acid (HA) solution consisting of major cations/anions representing natural water matrix (WM). Inactivation efficiency modelled by first order kinetics revealed an order as “high dose (hd) Fe-bare specimens-low dose (ld) Fe” in HAWM solution. On the other hand, solar photocatalytic inactivation kinetics of E. coli in HA followed the order of effectiveness as; ldFe-SynTiO₂≈SynTiO₂>hdFe-SynTiO₂>hdFe-TiO₂>ldFe-TiO₂>TiO₂. The selectivity of TiO₂ towards organics was evident in both HA solution and HAWM solution. Following photocatalytic inactivation, release of intracellular organic matter was followed by specific UV–vis and fluorescence spectroscopic parameters. Bare TiO₂ was more effective in removal of all specific UV–vis parameters in comparison to SynTiO₂. Fe dose dependency could be related to the HAWM components displaying a discriminating effect in between TiO₂ and SynTiO₂. UV–vis and fluorescence spectroscopic parameters were evaluated in accordance with total K, carbohydrate and protein contents. The results demonstrated that solar photocatalysis using Fe doped TiO₂ specimens could well serve as an alternative method for disinfection purposes.

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不同TiO2样品对太阳光催化大肠杆菌失活和腐殖质降解的双重响应

太阳能光催化被认为是一种降解水中微污染物、天然有机物和多种微生物的可行方法。作为一种常用的光催化剂，需要几种修饰方法，如Fe3 +掺杂TiO2，将光捕获范围扩展到可见光区域。本研究研究了裸（P-25）、合成TiO2 （SynTiO2）及其各自的Fe掺杂样品在以天然水基质（WM）为代表的主要阳离子/阴离子组成的腐殖酸（HA）溶液中对有机基质的同时降解和大肠杆菌（E. coli）失活的作用。一级动力学模型表明，在HAWM溶液中，裸铁样品的失活效率为“高剂量（hd） Fe-低剂量（ld） Fe”。另一方面，大肠杆菌在HA中的太阳光催化失活动力学的有效性顺序为；ldFe-SynTiO2≈SynTiO2> hdFe-SynTiO2> hdFe-TiO2> ldFe-TiO2>二氧化钛。TiO2在HA溶液和HAWM溶液中对有机物的选择性都很明显。光催化失活后，通过特定的紫外-可见和荧光光谱参数跟踪细胞内有机物的释放。与SynTiO2相比，裸TiO2更有效地去除所有特定的UV-vis参数。Fe的剂量依赖性可能与HAWM组分在TiO2和SynTiO2之间表现出区分作用有关。根据总钾、碳水化合物和蛋白质含量评估紫外-可见和荧光光谱参数。结果表明，利用Fe掺杂TiO2样品进行太阳能光催化可以作为一种替代的消毒方法。

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.