铂纳米颗粒装饰的 TiO2 纳米管在模拟实际条件下去除挥发性有机化合物和细菌:沉积方法对光催化降解过程效率的影响

IF 4.1 3区 化学 Q2 CHEMISTRY, PHYSICAL Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2024-08-19 DOI:10.1016/j.jphotochem.2024.115975
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引用次数: 0

摘要

在二氧化钛纳米结构中加入贵金属被认为是一种促进空气处理过程中污染物光催化降解的方法。本研究采用阳极氧化法在钛基底上生长出高度有序的 TiO2 纳米管(NTs)。利用两种不同的沉积方法:(1)电沉积和(2)光沉积,成功地用铂(Pt)纳米粒子(NPs)装饰了 TiO2-NTs。我们探讨了不同沉积方法对分散在二氧化钛纳米管上的铂纳米粒子(NPs)形态以及铂-二氧化钛纳米复合材料光学特性的影响、我们研究了不同沉积方法对分散在 TiO2 纳米管上的铂纳米粒子(NPs)形态和 Pt-TiO2 纳米复合材料光学特性的影响,以及它们对挥发性有机化合物(VOCs)和细菌的高效光催化活性降解。扫描电子显微镜(SEM)和透射电子显微镜(TEM)显示,纳米管状的二氧化钛锐钛矿结构缀有铂氮氧化物,氮氧化物的数量和大小取决于所采用的沉积技术。光致发光(PL)光谱表明,Pt/TiO2 异质结有利于分离光生电荷,从而降低载流子重组率。为了说明 Pt NPS 的作用,我们在醋酸乙酯(EA)的光降解中测试了纯 TiO2 和 Pt/TiO2 异质结。与二氧化钛相比,无论采用何种铂沉积方法,铂/二氧化钛异质结在乙酸乙酯降解方面都表现出更优越的光催化性能。在可见光照射下,120 秒的铂电沉积和 3 小时的铂光沉积可获得最佳效果,其动力学常数分别约为 0.245 mg.m-3.s-1 和 0.195 mg.m-3.s-1。使用铂和非铂装饰的二氧化钛氮氧化物测试了同时去除 EA 和细菌(大肠杆菌)的效果。与纯 TiO2 纳米管 60% 的降解率相比,使用两种高效光催化剂 Electro 120 s 和 Photo 3 h 后,细菌在 180 分钟后完全降解。
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Platinum nanoparticles decorated TiO2 nanotubes for VOCs and bacteria removal in simulated real condition: Effect of the deposition method on the photocatalytic degradation process efficiency

The incorporation of noble metals onto TiO2 nanostructure is considered as a promoting method to enhance the photocatalytic degradation of pollutant in air treatment process. In this study, highly organized TiO2 nanotubes (NTs) were grown by the anodization method of Titanium substrates. The TiO2-NTs were successfully decorated by platinum (Pt) nanoparticles (NPs) using two different deposition methods: (1) electrodeposition and (2) photodeposition.

We explore the impact of different deposition methods on the morphology of Pt nanoparticles (NPs) dispersed onto TiO2 nanotubes and the optical characteristics of Pt-TiO2 nanocomposites, investigating their efficacy in photocatalytic degradation We investigate the effect of varying the deposition method on the morphology of Pt-NPs dispersed onto TiO2 nanotubes and the optical properties of the Pt-TiO2 nanocomposites and their efficient photocatalytic activity degradation against Volatile Organic Compounds (VOCs) and bacteria. Scanning and Transmission Electron Microscopy (SEM and TEM) reveal a nanotubular TiO2 anatase structure adorned with Pt NPs, with the quantity and size of NPs contingent upon the deposition technique employed. The photoluminescence (PL) spectra demonstrate that the Pt/TiO2 heterojunction facilitates the separation of photogenerated charges, thereby diminishing carrier recombination rates. To point out the effect of Pt NPS, both pure TiO2 and Pt/TiO2 heterojunction were tested in the photodegradation of Ethyl Acetate (EA). The Pt/TiO2 heterojunction exhibits superior photocatalytic performance compared to TiO2 in EA degradation, regardless of the Pt deposition method employed. Optimal results are achieved with 120 s of Pt electrodeposition and 3 h of Pt photodeposition under visible irradiation, yielding kinetic constants of approximately 0.245 and 0.195 mg.m−3.s−1, respectively, underscoring the pivotal role of the platinum deposition method in pollutant photodegradation. Respectively simultaneous removal of EA and bacteria (Escherichia coli) was tested using Pt and non-Pt decorated TiO2 NTs. We attributed a total degradation of the bacteria after 180 min using the two efficient photocatalysts Electro 120 s and Photo 3 h compared to 60 % of degradation using pure TiO2 nanotubes.

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来源期刊
CiteScore
7.90
自引率
7.00%
发文量
580
审稿时长
48 days
期刊介绍: JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.
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