Enhanced pollutant photodegradation over nanoporous titanium-vanadium oxides with improved interfacial interactions

光降解 纳米孔 污染物 材料科学 光催化 化学工程 无机化学 化学 催化作用 纳米技术 冶金 有机化学 工程类
作者
Milad Laghaei,Mohsen Ghasemian,Mahmoud Reza Ghandehari Ferdowsi,Jürg A. Schütz,Lingxue Kong
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:646: 11-24 被引量:10
标识
DOI:10.1016/j.jcis.2023.04.180
摘要

This study addressed the separation problem of colloidal catalytic powder from its solution and pore blockage of traditional metallic oxides by fabricating nanoporous composites of titanium (Ti)-vanadium (V) oxide via magnetron sputtering, electrochemical anodization, and annealing processes. The effect of V-deposited loading on the composite semiconductors was investigated by varying V sputtering power (20-250 W) to correlate their physicochemical properties to the photodegradation performance of methylene blue. The obtained semiconductors revealed circular and elliptical pores (14-23 nm) and formed different metallic and metallic oxide crystalline phases. Within the nanoporous composite layer, V ions substituted Ti4+, leading to Ti3+ formation accompanied by decreased band gap values and higher visible-light absorption. Thus, the band gap of TiO2 was 3.15 eV, while that of Ti-V oxide with the maximum V content (at 250 W) was 2.47 eV. The interfacial separators between clusters in the mentioned composite created traps disrupting the charge carrier movements between crystallites, thereby decreasing the photoactivity. In contrast, the composite prepared with the minimum V content showed approximately 90% degradation efficiency under solar-simulated irradiation resulting from the homogeneous V dispersion and the lower recombination possibility, owing to its p-n heterojunction constituent. The nanoporous photocatalyst layers with their novel synthesis approach and outstanding performance can be applied in other environmental remediation applications.

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