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首页> 外文期刊>Applied Surface Science >Photocatalytic degradation of rhodamine B and real textile wastewater using Fe-doped TiO_2 anchored on reduced graphene oxide (Fe-TiO_2/rGO): Characterization and feasibility, mechanism and pathway studies
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Photocatalytic degradation of rhodamine B and real textile wastewater using Fe-doped TiO_2 anchored on reduced graphene oxide (Fe-TiO_2/rGO): Characterization and feasibility, mechanism and pathway studies

机译：Fe掺杂的TiO_2固定在还原氧化石墨烯（Fe-TiO_2 / rGO）上的光催化降解若丹明B和实际纺织废水的表征，可行性，机理和途径研究

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In this work, a simple sol-gel method was used to fabricate a ternary nanocomposite of Fe-doped TiO2 decorated on reduced graphene oxide (Fe-doped TiO2/rGO). XRD, Raman shift, FT-IR, BET, DRS, EIS, TEM, FESEM, EDX and EDS techniques were applied for characterization of the structural, optical, and surface morphological properties of the synthesized catalysts. The DRS results of the photocatalysts showed a narrowing band gap by the introduction of Fe ions to the titania framework. The photocatalytic performance of the prepared samples was determined through the decontamination of rhodamine B under solar illumination. The optimum content of iron and graphene oxide and the effect of operational factors including pH, catalyst dosage and the initial concentration of rhodamine B were studied. The findings revealed that a 0.6 g Fe-doped TiO2/ rGO nanocomposite containing 3% Fe and 5% rGO, with an initial pH of 6 and rhodamine B concentration of 20 mg/L could achieve a removal of 91% after 120 min under solar illumination. TOC analyses were conducted to explore the rhodamine B mineralization rate; the data showed complete mineralization after 300 min. The effect of coexisting ions was examined and the results indicated that the degradation efficiency was significantly decreased by the addition of chloride and sulfate anions, although it slightly decreased in the presence of nitrate and phosphate anions. Furthermore, the addition of H2O2 as an enhancer was investigated and the data demonstrated that the addition of 8 mM H2O2 enhanced the photocatalytic efficacy to complete degradation. Finally, in the treatment of real textile wastewater, the concentrations of TOC and COD decreased from 930 mg/L and 1550 mg/L to 310 mg/L and 634 mg/L, respectively, after 390 min under similar operational conditions.
机译：在这项工作中，使用一种简单的溶胶-凝胶法来制备装饰在还原氧化石墨烯上的Fe掺杂的TiO2三元纳米复合材料（Fe掺杂的TiO2 / rGO）。 XRD，拉曼位移，FT-IR，BET，DRS，EIS，TEM，FESEM，EDX和EDS技术被用于表征合成催化剂的结构，光学和表面形态特性。通过将Fe离子引入二氧化钛骨架，光催化剂的DRS结果显示出窄的带隙。制备的样品的光催化性能是通过在日光照射下若丹明B的去污来确定的。研究了铁和氧化石墨烯的最佳含量以及pH，催化剂用量和若丹明B初始浓度等操作因素的影响。研究结果表明，含有0.6％Fe的TiO2 / rGO纳米复合材料包含3％Fe和5％rGO，初始pH为6，若丹明B浓度为20 mg / L，在阳光下放置120分钟后，可去除91％。照明。进行TOC分析以探讨若丹明B的矿化率。数据显示300分钟后完全矿化。研究了共存离子的影响，结果表明，加入氯离子和硫酸根阴离子后降解效率明显降低，尽管在硝酸根和磷酸根阴离子存在下降解效率略有降低。此外，还研究了添加H2O2作为增强剂的情况，数据表明添加8 mM H2O2可以增强光催化效率以完成降解。最后，在相似的操作条件下，经过390分钟的处理后，在处理真正的纺织品废水时，TOC和COD的浓度分别从930 mg / L和1550 mg / L降至310 mg / L和634 mg / L。

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