In this work, hematite (α-Fe₂O₃) deposited on anatase TiO₂ was modified by plasma treatment and studied. α-Fe₂O₃/TiO₂ was successfully synthesized using sol-gel precipitation methods and the surface was modified by argon (Ar) gas plasma treatment to increase photocatalyst nanocomposite activity. The effect of Ar-plasma treatment times from 5 to 20 min at DC glow discharge powers of 50 watts was investigated. The crystal structures, surface morphology, optical properties were characterization by using X-ray Diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), UV-vis spectrometry (UV-Vis), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy (PL) and electrochemical impedance spectroscopy (EIS). After plasma treatment, the crystalline phase of TiO₂ form changed from pure anatase to a mixture of anatase and rutile phases. The particle size was reduced from 25 to 20 nm. The band gap energy decreased from approximately 2.18 eV to 1.84 eV and exhibited a wider absorption edge under visible light irradiation (400-700 nm). Ar-plasma modification of the surface showed the attribution of oxygen vacancies and Ti³⁺. The plasma treatment improved the heterojunction photocatalyst to enhance the photocatalytic activity under visible light for H₂ evolution. The best photocatalytic activity for H₂ evolution rate was obtained at 1.25 mmol h^-1 for α-Fe₂O₃/TiO₂-10 photocatalyst compared to α-Fe₂O₃/TiO₂-untreated (0.13 mmol h^-1). The plasma treatment on photocatalyst materials showed long-term stability and excellent separation of the photogenerated charge carriers.

在这项工作中，赤铁矿（α-的Fe ₂ ö ₃沉积在锐钛矿型的TiO）₂是通过等离子体处理改性的和研究。的α-Fe ₂ ö ₃ /二氧化钛₂是使用溶胶-凝胶沉淀方法成功地合成和表面用氩气改性（Ar）气等离子处理以提高光催化剂的纳米复合材料的活性。等离子体处理时间从5到20的效果 研究了直流辉光放电功率为50瓦时的最小电流。使用X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），原子力显微镜（AFM），紫外可见光谱（UV-Vis）表征晶体结构，表面形态，光学性质），X射线光电子能谱（XPS），光致发光光谱（PL）和电化学阻抗谱（EIS）。在等离子体处理之后，TiO ₂的晶相形式从纯锐钛矿变为锐钛矿和金红石相的混合物。粒径从 25nm降低至20nm。带隙能量从大约2.18  eV下降到1.84  eV，并且在可见光辐照下表现出更宽的吸收边（400-700） 纳米）。表面的等离子体改性显示氧空位和Ti ³⁺的归属。等离子体处理改进了异质结光催化剂，以增强可见光下H ₂析出的光催化活性。对于H中的光催化活性最好₂以1.25得到释放速率 毫摩尔 ħ ^-1为的α-Fe ₂ ö ₃ /二氧化钛₂ -10的光催化剂相比的α-Fe ₂ ö ₃ /二氧化钛₂ -untreated（0.13 毫摩尔 ħ ^-1）。对光催化剂材料进行的等离子体处理显示出长期稳定性，并且光生载流子的分离效果极好。