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首页> 外文期刊>Applied Surface Science >Photooxidation of different organic dyes (RB, MO, TB, and BG) using Fe(III)-doped TiO_2 nanophotocatalyst prepared by novel chemical method
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Photooxidation of different organic dyes (RB, MO, TB, and BG) using Fe(III)-doped TiO_2 nanophotocatalyst prepared by novel chemical method

机译：用新型化学方法制备的掺杂Fe（III）的TiO_2纳米光催化剂对不同的有机染料（RB，MO，TB和BG）进行光氧化

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摘要

The nano-structured Fe(III)-doped TiO_2 photocatalysts with anatase phase have been developed for the oxidation of non-biodegradable different organic dyes like methyl orange (MO), rhodamine B (RB), thymol blue (TB) and bromocresol green (BG) using UV-Hg-lamp. The different compositions of Fe_xTi_(1-x)O_2 (x = 0.005,0.01,0.05, and 0.1) nanocatalysts synthesized by chemical method (CM), have been characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra, specific surface area (BET), transmission electronic microscopy (TEM) analysis, XPS, ESR and zeta potential. From XRD analysis, the results indicate that all the compositions of Fe(III) doped in TiO_2 catalysts gives only anatase phase not rutile phase. For complete degradation of all the solutions of the dyes (MO, RB, TB, and BG), the composition with x = 0.005 is more photoactive compared all other compositions of Fe_xTi_(1-x)O_2 and degussa P25. The decolorization rate of different dyes decreases as Fe(III) concentration in TiO_2 increases. The energy band gap of Fe(III)-doped TiO_2 is found to be 2.38 eV. The oxidation state of iron has been found to be 3+ from XPS and ESR show that Fe~(3+) is in low spin state.
机译：已开发出具有锐钛矿相的Fe（III）掺杂的纳米结构TiO_2光催化剂，用于氧化不可生物降解的不同有机染料，如甲基橙（MO），若丹明B（RB），百里酚蓝（TB）和溴甲酚绿（ BG）使用紫外线汞灯。通过X射线衍射（XRD），紫外可见漫反射光谱表征了通过化学方法（CM）合成的Fe_xTi_（1-x）O_2（x = 0.005、0.01、0.05和0.1）纳米催化剂的不同组成，比表面积（BET），透射电子显微镜（TEM）分析，XPS，ESR和Zeta电位。通过XRD分析，结果表明掺杂在TiO_2催化剂中的Fe（III）的所有组成仅给出锐钛矿相而不是金红石相。为了完全降解染料的所有溶液（MO，RB，TB和BG），与所有其他Fe_xTi_（1-x）O_2和degussa P25成分相比，x = 0.005的成分具有更高的光活性。随着TiO_2中Fe（III）浓度的增加，不同染料的脱色率降低。发现Fe（III）掺杂的TiO_2的能带隙为2.38eV。 XPS发现铁的氧化态为3 +，ESR表明Fe〜（3+）处于低自旋态。

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