Synthesis of novel TiO2/CeFeO3 heterojunction using Mugwort (Artemisia vulgaris) leaves extracts with enhanced photocatalytic activity under visible light irradiation

IF 7.5 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances Pub Date : 2024-04-06 DOI:10.1016/j.apsadv.2024.100599

Bambang Wijaya , Dewangga Oky Bagus Apriandanu , Rizki Marcony Surya , Yoki Yulizar , Nonni Soraya Sambudi , Munawar Khalil , Aminah Umar

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Abstract

TiO₂ is a low-cost and biocompatible material with high oxidizing ability. However, their photocatalytic activity is limited to UV light irradiation. In this research, for the first time, a novel TiO₂/CeFeO₃ heterojunction was synthesized by the green synthesis method using an aqueous fraction of Artemisia vulgaris leaf extracts. TiO₂/CeFeO₃ shows enhanced photocatalytic performance under visible light irradiation. The vibrational, structural, optical, and compositional properties of TiO₂/CeFeO₃ were characterized. The as-prepared TiO₂/CeFeO₃ has spherical-shaped particles and shows a significantly diminished bandgap energy (3.25 eV to 2.75 eV). The photocatalytic performance of TiO₂/CeFeO₃ was investigated to degrade malachite green (MG) with an efficiency of up to 93.53% under its optimum dose. TiO₂/CeFeO₃ shows stable photocatalytic performance until the fourth cycle. The kinetics of the photodegradation of MG followed the pseudo-first-order reaction with a rate constant (k_a_pp) of 2.14×10⁻² min⁻¹. The enhanced photocatalytic activity of TiO₂/CeFeO₃ was attributable to the creation of heterojunction, which suppresses the recombination rate of photogenerated electron-hole validated by the photoluminescence analysis. This work presents an eco-friendly approach to synthesizing novel heterojunction material with enhanced photocatalytic dye degradation.

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利用艾蒿叶提取物合成新型 TiO2/CeFeO3 异质结，增强其在可见光照射下的光催化活性

二氧化钛是一种低成本、生物相容性好的材料，具有很强的氧化能力。然而，它们的光催化活性仅限于紫外线照射。本研究首次利用青蒿叶提取物的水溶液馏分，通过绿色合成法合成了新型 TiO2/CeFeO3 异质结。在可见光照射下，TiO2/CeFeO3 显示出更强的光催化性能。研究人员对 TiO2/CeFeO3 的振动、结构、光学和组成特性进行了表征。制备的 TiO2/CeFeO3 具有球形颗粒，带隙能显著降低（从 3.25 eV 降至 2.75 eV）。研究了 TiO2/CeFeO3 的光催化性能，在最佳剂量下，其降解孔雀石绿（MG）的效率高达 93.53%。TiO2/CeFeO3 的光催化性能在第四个循环之前一直很稳定。MG 的光降解动力学遵循假一阶反应，速率常数（kapp）为 2.14×10-2 min-1。TiO2/CeFeO3 光催化活性的增强归因于异质结的产生，异质结抑制了光生电子-空穴的重组率，这一点通过光致发光分析得到了验证。这项研究提出了一种合成新型异质结材料的环保方法，可增强染料的光催化降解能力。

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