光催化脱除2,4- d除草剂的MnOx/TiO2纳米结构设计

IF 2.5 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Angeles Mantilla, Sandra Cipagauta Díaz, Enrique Samaniego Benitez, Francisco Javier Tzompantzi Morales, Michelle Navarrete Magaña
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引用次数: 0

摘要

通过不同的合成路线对半导体进行研究和修饰,可以获得性能最优的材料,以诱导新的能级,提高电荷分离效率。在此背景下,采用溶胶-凝胶法合成了掺杂不同百分比MnOx的tio2基材料,以评价其在紫外照射下降解水中除草剂2,4-二氯苯氧乙酸(2,4- d)的光催化活性。表征结果显示晶体尺寸减小到7.2 nm。MnOx的加入增强了TiO2的光吸收,导致TiO2的光谱向禁能带的红端偏移。随着MnOx含量的增加,光催化活性显著提高,3mnti材料在6小时内达到最大降解率70%。这是由于合成方法促进了主要由TiO2和MnO2组成的纳米结构异质结的形成,减少了电子-空穴对的重组。TEM分析证实了这些结构。考虑了载流子的迁移性和污染物的光氧化过程,提出了3mnti材料的反应机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Design of MnOx/TiO2 Nanostructures for Photocatalytic Removal of 2,4-D Herbicide

Design of MnOx/TiO2 Nanostructures for Photocatalytic Removal of 2,4-D Herbicide

The research and modification of semiconductors through different synthesis routes allow obtaining materials with optimal properties to induce new energy levels and improve charge separation efficiency. In this context, the sol-gel method was used to synthesize TiO2-based materials doped with different percentages of MnOx to evaluate their photocatalytic activity in the degradation of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) in water under UV irradiation. Characterization results revealed a reduction in crystallite size to 7.2 nm. Adding MnOx enhanced the optical absorption of TiO2, resulting in a shift toward the red end of the spectrum of the forbidden energy band. The photocatalytic activity increased significantly with the percentage of MnOx, reaching a maximum degradation of 70 % in 6 hours with the 3 MnTi material. This increase was attributed to the synthesis method, which facilitated the formation of nanostructured heterojunctions mainly composed of TiO2 and MnO2, reducing the recombination of electron-hole pairs. TEM analysis confirmed these structures. A reaction mechanism for the 3 MnTi material is proposed, considering the mobility of charge carriers and the photooxidation processes of the pollutant.

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来源期刊
ChemistryOpen
ChemistryOpen CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
4.80
自引率
4.30%
发文量
143
审稿时长
1 months
期刊介绍: ChemistryOpen is a multidisciplinary, gold-road open-access, international forum for the publication of outstanding Reviews, Full Papers, and Communications from all areas of chemistry and related fields. It is co-owned by 16 continental European Chemical Societies, who have banded together in the alliance called ChemPubSoc Europe for the purpose of publishing high-quality journals in the field of chemistry and its border disciplines. As some of the governments of the countries represented in ChemPubSoc Europe have strongly recommended that the research conducted with their funding is freely accessible for all readers (Open Access), ChemPubSoc Europe was concerned that no journal for which the ethical standards were monitored by a chemical society was available for such papers. ChemistryOpen fills this gap.
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