Abstract We reported the immobilization of binary heterojunction Eu3+-ZnO/Bi2O3 over the surface of graphene oxide (GO) sheets by precipitation method to compose a visible light drive photocatalyst. The ternary nanocomposites were characterized by different spectral technique like FESEM, FTIR, XRD, XPS, EDX, HRTEM, UV–visible, PL, HPLC and LCMS analysis. The high specific surface area of 106.0 m2g-1 of Eu3+-ZnO/Bi2O3/GO nanocomposites was ascertained by BET adsorption-desorption isotherm. The nano-composite exhibit excellent photo-efficiency for the photodegradation of 2, 4-dimethyl phenol (DMP) under visible region and was almost completely mineralized in 100 min as compared to the bare and binary system. The mineralized products of DMP were analyzed by HPLC and LCMS analysis. The kinetic model suggests the degradation pathway obeys pseudo-first order kinetic. Their antibacterial property were assessed against E. coli bacteria and nearly 90% of gram negative bacteria were killed by using ternary photocatalyst as determined by CFU method. Also, Eu3+-ZnO/Bi2O3/GO nanocomposites possessed significant recycle efficiency up to six consecutive cycles which is beneficial to minimize the tariff. The improved photo-efficiency is due to the extension towards visible region, increase surface area, and high charge separation in ternary heterojunction.

中文翻译：

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在氧化石墨烯片上合成 Eu3+−掺杂的 ZnO/Bi2O3 异质结光催化剂，用于可见光辅助降解 2,4-二甲基苯酚和杀菌

摘要 我们报道了通过沉淀法将二元异质结 Eu3+-ZnO/Bi2O3 固定在氧化石墨烯 (GO) 片材表面上以组成可见光驱动光催化剂。通过FESEM、FTIR、XRD、XPS、EDX、HRTEM、UV-visible、PL、HPLC和LCMS分析等不同的光谱技术对三元纳米复合材料进行了表征。Eu3+-ZnO/Bi2O3/GO 纳米复合材料的高比表面积为 106.0 m2g-1，由 BET 吸附-解吸等温线确定。该纳米复合材料在可见光区对 2, 4-二甲基苯酚 (DMP) 的光降解表现出优异的光效，与裸系统和二元系统相比，在 100 分钟内几乎完全矿化。DMP的矿化产物通过HPLC和LCMS分析进行分析。动力学模型表明降解途径服从伪一级动力学。它们对大肠杆菌的抗菌性能进行了评估，通过 CFU 法测定，使用三元光催化剂可以杀死近 90% 的革兰氏阴性菌。此外，Eu3+-ZnO/Bi2O3/GO 纳米复合材料在连续六个循环内具有显着的回收效率，这有利于最大限度地降低关税。提高的光效率是由于三元异质结向可见光区域的延伸、增加的表面积和高电荷分离。Eu3+-ZnO/Bi2O3/GO 纳米复合材料在连续 6 次循环中具有显着的回收效率，这有利于最大限度地降低关税。提高的光效率是由于三元异质结向可见光区域的延伸、增加的表面积和高电荷分离。Eu3+-ZnO/Bi2O3/GO 纳米复合材料在连续 6 次循环中具有显着的回收效率，这有利于最大限度地降低关税。提高的光效率是由于三元异质结向可见光区域的延伸、增加的表面积和高电荷分离。