Abstract Zn2GeO4/rGO composite photocatalysts were prepared by hydrothermal method with Zn2GeO4 and GO as precursors, and ethanol/water solvent as a reducing agent. Reduced graphene oxide was combined with Zn2GeO4 nanorods in order to improve photocatalytic activity of Zn2GeO4 through improving its surface area, adsorption capacity, charges separation and transportation ability. Then the composite photocatalysts were characterized by XRD, FESEM, EDS and UV–vis DRS. RhB synthetic dye wastewater was used as the target to investigate the effect of each reaction parameter on the degradation rate; the catalytic performance stability of the composite photocatalyst was investigated under the obtained optimal reaction conditions; and the reaction kinetics and reaction mechanism of the synthetic wastewater treatment process were preliminarily analyzed. The study shows that the Zn2GeO4/rGO composite photocatalyst prepared by hydrothermal method has better photocatalytic activity under xenon light illumination, and the wastewater treatment process conforms first-order reaction kinetic characteristics; during the treatment, the dye molecules are directly degraded by the composite photocatalyst, and no other luminescent groups are produced. The Zn2GeO4/rGO composite photocatalyst with good photocatalytic activity and stability under visible light irradiation can be prepared by hydrothermal method for dye wastewater treatment.

中文翻译：

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纳米Zn2GeO4/rGO复合光催化剂的制备及其对合成染料废水的处理

摘要 以Zn2GeO4和GO为前驱体，乙醇/水溶剂为还原剂，采用水热法制备了Zn2GeO4/rGO复合光催化剂。还原氧化石墨烯与Zn2GeO4纳米棒结合，通过提高Zn2GeO4的表面积、吸附能力、电荷分离和传输能力来提高其光催化活性。然后通过XRD、FESEM、EDS和UV-vis DRS对复合光催化剂进行表征。以RhB合成染料废水为研究对象，考察各反应参数对降解率的影响；在得到的最佳反应条件下考察了复合光催化剂的催化性能稳定性；并对合成废水处理过程的反应动力学和反应机理进行了初步分析。研究表明，水热法制备的Zn2GeO4/rGO复合光催化剂在氙灯照射下具有较好的光催化活性，废水处理过程符合一级反应动力学特性；在处理过程中，染料分子被复合光催化剂直接降解，不产生其他发光基团。水热法可制备出具有良好光催化活性和可见光稳定性的Zn2GeO4/rGO复合光催化剂用于染料废水处理。染料分子被复合光催化剂直接降解，不产生其他发光基团。水热法可制备出具有良好光催化活性和可见光稳定性的Zn2GeO4/rGO复合光催化剂用于染料废水处理。染料分子被复合光催化剂直接降解，不产生其他发光基团。水热法可制备出具有良好光催化活性和可见光稳定性的Zn2GeO4/rGO复合光催化剂用于染料废水处理。