Template-free synthesis of porous TiO2/CdS for enhanced photocatalytic degradation from ilmenite

IF 1.7 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Transition Metal Chemistry Pub Date : 2025-03-22 DOI:10.1007/s11243-025-00650-w

Zhichao Zhang, Jianbo Zhang, Kangzheng Li, Binglin Tang, Xiaohui Wang, Ling Tan, Yijie Hu, Qingcheng Luo, Zhe Yin, Guoping Yu, Bo Lv

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引用次数: 0

Abstract

Natural mineral composite catalysts have attracted much attention due to their great potential in the fields of water treatment, air purification and energy conversion. In this study, porous TiO₂ materials were synthesized from ilmenite by a two-stage calcination and acid leaching process, and porous TiO₂/CdS composites were prepared by a hydrothermal method. The results of photocatalytic experiments indicate that the porous TiO₂/CdS composite (PTC-2) with a Ti/Cd molar ratio of 1:1 exhibits the highest photocatalytic activity, with the degradation rate of methylene blue achieving a maximum value of 96.6% at 80 min. Moreover, the composite maintains a degradation efficiency of 88.5% after five cycles. The findings demonstrate that the TiO₂/CdS heterojunction significantly enhances the photocatalyst's absorption of visible light while facilitating the effective separation and transfer of photogenerated electron–hole (e⁻/h⁺) pairs. The porous architecture of the composite facilitates superior electron transport pathways and effectively mitigates e⁻/h⁺ recombination. Furthermore, a mechanism for the photocatalytic degradation of organic dyes using porous TiO₂/CdS composites is proposed, wherein photogenerated superoxide radicals (^·O₂⁻) and hydroxyl radicals (^·OH) serve as the primary reactive species. This study explores the cost-effective synthesis of TiO₂/CdS heterojunctions and makes a significant contribution to the advancement and utilization of natural minerals for pollution degradation.

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钛铁矿光催化降解多孔TiO2/CdS的无模板合成

天然矿物复合催化剂因其在水处理、空气净化和能量转换等领域的巨大潜力而备受关注。本研究以钛铁矿为原料，采用两段焙烧和酸浸法制备了多孔TiO2材料，并采用水热法制备了多孔TiO2/CdS复合材料。光催化实验结果表明，Ti/Cd摩尔比为1:1的多孔TiO2/CdS复合材料（PTC-2）具有最高的光催化活性，在80 min时对亚甲基蓝的降解率达到96.6%的最大值。经过5次循环后，复合材料的降解效率仍保持在88.5%。研究结果表明，TiO2/CdS异质结显著增强了光催化剂对可见光的吸收，同时促进了光生电子-空穴（e−/h+）对的有效分离和转移。复合材料的多孔结构有利于优越的电子传递途径，并有效地减轻e - /h+复合。此外，提出了一种利用多孔TiO2/CdS复合材料光催化降解有机染料的机制，其中光生成的超氧自由基（·O2−）和羟基自由基（·OH）是主要的反应物质。本研究探索了具有成本效益的TiO2/CdS异质结的合成方法，为推进和利用天然矿物降解污染做出了重要贡献。

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来源期刊

Transition Metal Chemistry 化学-无机化学与核化学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

1.3 months

期刊介绍： Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc. Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.