Enhanced photocatalytic properties of TiO2/rGO nanocomposites Doped with CdS

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2024-11-04 DOI:10.1016/j.matlet.2024.137660

Evgeniya Seliverstova , Timur Serikov , Aigul Sadykova , Niyazbek Ibrayev , Nurxat Nuraje

引用次数: 0

Abstract

To increase the photocatalytic activity of nanocomposite based on TiO₂ and rGO (NC) and improve its photosensitivity in the visible region of the spectrum, the influence of CdS concentration (1 to 10 wt% with respect to NC) on its physicochemical and photocatalytic properties was studied. The addition of CdS to NC leads to a significant increase in the photocatalytic activity. An almost fivefold increase in photocurrent compared to pure NC was registered for NC/CdS_5%. Data on Methylene blue photodegradation showed that after 210 min of irradiation, only 5 % of dye molecules remained in solution. This value is 14.4 and 11.6 times higher than that of pure NC or CdS, respectively. Enhanced photocatalytic activity is related both to the improvement of NC absorption in the region of 400–800 nm and the decrease of the band gap width of NC upon addition of CdS, as well as the significant change in the electrophysical characteristics of the nanocomposite.

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增强掺杂 CdS 的 TiO2/rGO 纳米复合材料的光催化性能

为了提高基于 TiO2 和 rGO（NC）的纳米复合材料的光催化活性，并改善其在光谱可见区的光敏性，研究了 CdS 浓度（相对于 NC 为 1 至 10 wt%）对其物理化学和光催化特性的影响。在 NC 中添加 CdS 可显著提高光催化活性。与纯 NC 相比，NC/CdS_5% 的光电流几乎增加了五倍。亚甲基蓝的光降解数据显示，经过 210 分钟的辐照后，只有 5% 的染料分子留在溶液中。这一数值分别是纯 NC 或 CdS 的 14.4 倍和 11.6 倍。光催化活性的增强既与加入 CdS 后 NC 在 400-800 纳米波长区域吸收率的提高和 NC 带隙宽度的减小有关，也与纳米复合材料的电物理特性的显著变化有关。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive