In this work, a novel bimetallic ternary composite (AuCu-P25-rGO) had been designed and prepared, and been used as a high-performance photocatalyst. The morphology, chemical composition, physical structure and photoelectric property were confirmed by XRD, TEM, BET analysis, FT-IR, Raman, XPS, UV-vis DRS, Photoluminscence spectra and transient photocurrent responses techniques. The photocatalysts possessed higher catalytic activity than P25, P25-rGO, AuCu-P25, Cu-P25-rGO, Au-P25-rGO for photodegradation of organic pollutant (2-nitrophenol) under UV–vis light. Importantly, the molar ratio of Au:Cu exhibited significant influence on the photocatalytic property, and AuCu-P25-rGO with Au/Cu molar ratio = 1:1 showed higher activity than these with Au/Cu molar ratio = 1:3 and 3:1. In addition, Au₁Cu₁-P25-rGO could excellently photodegradation of organic dyes (Rhodamine B and methylene blue). The enhanced photocatalytic performance of AuCu-P25-rGO composites can be attributed to three reasons as follows: (1) surface plasmon resonance (SPR) effect of AuCu bimetallic nanoparticles; (2) outstanding conductivity and adsorptivity of rGO; (3) the polymorphs junction formed by mixture of anatase and rutile of P25.

在这项工作中，一种新型的双金属三元复合材料（AuCu-P25-rGO）已被设计和制备，并被用作高性能的光催化剂。通过XRD，TEM，BET分析，FT-IR，拉曼，XPS，UV-vis DRS，光致发光光谱和瞬态光电流响应技术确定了形貌，化学组成，物理结构和光电性能。在紫外可见光下，光催化剂具有比P25，P25-rGO，AuCu-P25，Cu-P25-rGO，Au-P25-rGO更高的催化活性。重要的是，Au：Cu的摩尔比对光催化性能有显着影响，Au / Cu摩尔比= 1：1的AuCu-P25-rGO的活性高于Au / Cu摩尔比= 1：3和3的AuCu-P25-rGO ：1。另外，Au ₁ Cu ₁-P25-rGO可以出色地降解有机染料（若丹明B和亚甲基蓝）。AuCu-P25-rGO复合材料增强的光催化性能可归因于以下三个原因：（1）AuCu双金属纳米粒子的表面等离子体共振（SPR）效应；（2）rGO具有出色的导电性和吸附性；（3）由P25的锐钛矿和金红石的混合物形成的多晶型物连接。