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首页> 外文期刊>Applied Surface Science >Visible-light photocatalytic degradation of methylene blue with Fe doped CdS nanoparticles
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Visible-light photocatalytic degradation of methylene blue with Fe doped CdS nanoparticles

机译：Fe掺杂CdS纳米粒子的可见光光催化降解亚甲基蓝

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摘要

Fe doped CdS nanoparticles (Cd_(1-x)Fe_xS; where x = 0.00,0.03,0.05 and 0.10) were synthesized by a chemical precipitation method. The synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Raman and UV-vis spectrometer. The XRD and TEM measurements show that the size of crystallites is in the range of 2-10 nm. With increased the Fe doping concentration, the position of the Raman bands shifted towards higher wavenumbers and their intensities decreased drastically. Optical measurements indicated that the absorption band edge shifted towards longer wavelength upon Fe doping. Direct allowed band gap of undoped and Fe doped CdS nanoparticles measured by UV-vis spectrometer were 2.3 and 2.2 eV at 100 ℃, respectively. Photocatalytic activities of CdS and Fe doped CdS were evaluated by irradiating the solution of methylene blue (MB) and sample under visible light. It was found that Fe doped CdS bleaches MB much faster than undoped CdS upon its exposure to the visible light. The optimum Fe/Cd ratio was observed to be 3 mol% for photocatalytic applications. In contrast, little degradation was observed for the pure CdS powder.
机译：通过化学沉淀法合成了Fe掺杂的CdS纳米颗粒（Cd_（1-x）Fe_xS；其中x = 0.00、0.03、0.05和0.10）。通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），拉曼光谱和紫外可见光谱仪对合成产物进行表征。 XRD和TEM测量表明，微晶的尺寸在2-10nm范围内。随着Fe掺杂浓度的增加，拉曼能带的位置向更高的波数移动，其强度急剧下降。光学测量表明，Fe掺杂后吸收带边缘向更长的波长移动。紫外可见分光光度计在100℃下测得的未掺杂和Fe掺杂的CdS纳米粒子的直接允许带隙分别为2.3和2.2 eV。通过在可见光下照射亚甲基蓝（MB）和样品的溶液来评估CdS和Fe掺杂的CdS的光催化活性。发现Fe掺杂的CdS漂白剂在暴露于可见光下比未掺杂的CdS漂白MB要快得多。对于光催化应用，观察到最佳的Fe / Cd比率为3mol％。相反，纯CdS粉末几乎没有降解。

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