Preparation of Mn3O4 nanoparticles on Al-substrate for degradation of Rhodamine B under solar light

IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Journal of the Iranian Chemical Society Pub Date : 2024-07-30 DOI:10.1007/s13738-024-03054-2
A. Chaa, A. Haddad, G. Rekhila, S. Tria, M. Trari
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Abstract

The semiconducting properties of Mn3O4 thin films were assessed for the heterogeneous photocatalytic oxidation of Rhodamine B (Rh B). The films were grown on Al-substrate using a spray coating, and their physical and photoelectrochemical characteristics were studied. X-ray diffraction analysis showed a well-crystallized structure of the spinel Mn3O4. The atomic force microscopy revealed dense and irregular grains with a mean size of ~ 50 nm and a thickness of ~ 1 µm. The direct optical transition at 2.19 eV, in agreement with the brown color, is assigned to d–d transitions within the incomplete Mn-3d shell, which enables efficient photocatalytic conversion of the solar radiation. The photoelectrochemical measurements demonstrated p-type comportment, evidenced by a negative slope in the [capacitance−2–potential: C−2–E] graph with a flat band potential of + 0.35 VSCE and a hole density of 6.5 × 1018 cm−3. The electrochemical impedance spectroscopy (EIS) plot showed a semicircle due to a capacitive comportment of the bulk spinel (Rb = 70 kΩ cm2). The center positioned below the abscissa axis (− 23°) with a constant phase element (CPE). The conduction band (− 1.64 VSCE) is more cathodic than the \({\text{O}}_{{2}} /{\text{O}}_{{2}}^{ \bullet - }\) level, thus catalyzing the photocatalytic process by \({\text{O}}_{{2}}^{ \bullet - }\) radicals. Under sunlight, 50% reduction of the Rh B concentration (10 ppm) was achieved within 1 h, the color removal, followed by spectrophotometry obeys a pseudo-first-order kinetic model with a rate constant of 9.9 × 10–3 min−1 (t1/2 = 70 min).

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在铝基底上制备用于在太阳光下降解罗丹明 B 的 Mn3O4 纳米粒子
在罗丹明 B(Rh B)的异相光催化氧化过程中,对 Mn3O4 薄膜的半导体特性进行了评估。薄膜采用喷涂法在铝基底上生长,并对其物理和光电化学特性进行了研究。X 射线衍射分析表明尖晶石 Mn3O4 具有良好的晶体结构。原子力显微镜显示出致密而不规则的晶粒,平均尺寸约为 50 纳米,厚度约为 1 微米。2.19 eV 处的直接光学转变与棕色一致,是不完整的 Mn-3d 壳内的 d-d 转变,从而实现了太阳辐射的高效光催化转换。光电化学测量结果表明,该化合物具有 p 型特性,其[电容-2-电位:C-2-E]图的斜率为负值,平带电位为 + 0.35 VSCE,空穴密度为 6.5 × 1018 cm-3。电化学阻抗谱(EIS)图显示了一个半圆,这是由于块状尖晶石的电容性(Rb = 70 kΩ cm2)造成的。中心位置低于缺省轴(- 23°),具有恒定相位元素(CPE)。导带(- 1.64 VSCE)比 \({\text{O}}_{{2}} /{\text{O}}_{2}}^{ \bullet - }\) 电平更具阴极性,从而催化了 \({\text{O}}_{2}}^{ \bullet - }\) 自由基的光催化过程。在阳光照射下,Rh B 浓度(10 ppm)在 1 小时内降低了 50%,颜色的去除以及随后的分光光度法遵循了一个伪一阶动力学模型,其速率常数为 9.9 × 10-3 min-1 (t1/2 = 70 分钟)。
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来源期刊
CiteScore
4.40
自引率
8.30%
发文量
230
审稿时长
5.6 months
期刊介绍: JICS is an international journal covering general fields of chemistry. JICS welcomes high quality original papers in English dealing with experimental, theoretical and applied research related to all branches of chemistry. These include the fields of analytical, inorganic, organic and physical chemistry as well as the chemical biology area. Review articles discussing specific areas of chemistry of current chemical or biological importance are also published. JICS ensures visibility of your research results to a worldwide audience in science. You are kindly invited to submit your manuscript to the Editor-in-Chief or Regional Editor. All contributions in the form of original papers or short communications will be peer reviewed and published free of charge after acceptance.
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