Photocatalytic technology provides a new strategy for the treatment of water pollution and energy crisis. Developing photocatalytic materials with high efficiency and stable visible light response has always been the direction of scientific researchers in the photocatalytic field. In this paper, we designed and prepared an efficient and stable rGO-modifited type-I Ag₂S/g-C₃N₄ heterojunction photocatalyst (rGO/Ag₂S/CN). The TEM (Transmission electron microscope) technology shows that the morphology of rGO/Ag₂S/CN is a sandwich-like structure. UV–Vis DRS (UV–visible diffuse-reflectance spectrum) shows that the loading of Ag₂S NPs and the modification of rGO effectively enhance the light response performance of nanocomposite materials in visible light. PL (Photoluminescence) and PEC (Photoelectrochemical) results prove that the photogenerated carriers transport and separation efficiency of rGO/Ag₂S/CN have been improved. The photodegradation of RhB and the photoreduction of CO₂ results confirmed that this ternary nanocomposite has great photocatalytic activity. The photodegradation efficiency of the RhB aqueous solution is about 98.5% after 30 min under the visible light irradiation. The photoreduction experiments showed that the yields of CO and CH₄ are 178.05 μmol/g and 121.11 μmol/g, respectively after 8 h under the UV light irradiation. The results of cyclic photocatalytic experiments and the XRD pattern after those processes further revealed that the modification of rGO not only enhanced the photocatalytic performance of the nanocomposite photocatalyst, but also effectively improved the stability of Ag₂S in the photocatalytic process. The possible photocatalytic reaction mechanisms were discussed in detail.

光催化技术为处理水污染和能源危机提供了新的策略。开发具有高效率和稳定的可见光响应的光催化材料一直是光催化领域科研人员的方向。在本文中，我们设计并制备了一种高效且稳定的rGO修饰的I型Ag ₂ S / gC ₃ N ₄异质结光催化剂（rGO / Ag ₂ S / CN）。TEM（透射电子显微镜）技术表明，rGO / Ag ₂ S / CN的形态为三明治状结构。UV-Vis DRS（UV-可见漫反射光谱）表明，Ag ₂的负载单核苷酸多态性和rGO的修饰有效地增强了纳米复合材料在可见光下的光响应性能。PL（光致发光）和PEC（光电化学）结果证明，rGO / Ag ₂ S / CN的光生载流子传输和分离效率得到了提高。RhB的光降解和CO ₂的光还原结果证实该三元纳米复合材料具有良好的光催化活性。在可见光照射下30分钟后，RhB水溶液的光降解效率约为98.5％。光还原实验表明，CO和CH ₄的收率较高。在紫外线照射8小时后，分别为178.05μmol/ g和121.11μmol/ g。循环光催化实验的结果以及经过这些过程后的XRD图谱进一步表明，rGO的修饰不仅增强了纳米复合光催化剂的光催化性能，而且还有效地提高了Ag ₂ S在光催化过程中的稳定性。详细讨论了可能的光催化反应机理。