Sunlight‐driven photocatalytic degradation has attracted great attention to tackle the issue of water contaminating organic dyes. As a proof of concept, we propose that nanoceria (CeO₂) decorated on the surface of reduced graphene oxide (rGO), could effectively degrade pollutant organic dyes namely methylene blue (MB) and congo red (CR), when exposed to sunlight. The formation of as‐synthesized nanocomposite (CeO₂@rGO) was monitored using UV‐visible, Fourier transfer infrared (FTIR) and RAMAN spectroscopy, X‐ray diffraction (XRD), Photoluminescence (PL), and Field emission scanning electronic microscopy (FESEM). Time‐dependent dye degradation was observed for up to 5 h and followed Langmuir‐Hinshelwood first‐order kinetics. Notably, at equivalent concentrations (2 mg), CeO₂@rGO exhibited enhanced degradation of MB (∼92 %) and CR (∼83 %) dyes when compared to bare CeO₂. The photocatalytic efficiency of CeO₂@rGO was further enhanced by integrating in a polymer hydrogel fabricated using tragacanth (TG), a natural gum. The hydrogel photocatalyst (CeO₂@rGO‐TG) exhibited ∼91 % MB degradation, at half the amount of CeO₂@rGO in free form. More importantly, CeO₂@rGO‐TG could be easily separated from the dye solution and re‐employed for multiple cycles of degradation.

中文翻译：

---

黄ga胶水凝胶集成CeO2 @ rGO纳米复合材料作为可降解有机染料降解的光催化剂

阳光驱动的光催化降解引起了人们极大的关注，以解决水污染有机染料的问题。作为概念的证明，我们建议在氧化石墨烯（rGO ）的表面上装饰的纳米氧化铈（CeO ₂）在暴露于阳光下时可以有效降解亚甲基蓝（MB）和刚果红（CR）等污染物有机染料。使用紫外可见光，傅立叶转移红外（FTIR）和拉曼光谱，X射线衍射（XRD），光致发光（PL）和场发射扫描电子显微镜对合成的纳米复合材料（CeO ₂ @rGO）的形成进行监测（ FESEM）。观察到时间依赖性染料降解长达5小时，并遵循Langmuir-Hinshelwood一级动力学。值得注意的是，当浓度相等时（2 mg），CeO₂ @rGO与裸CeO ₂相比，显示出MB（〜92％）和CR（〜83％）染料的降解增强。通过将其掺入使用天然树胶黄efficiency胶（TG）制成的聚合物水凝胶中，可以进一步提高CeO ₂ @rGO的光催化效率。水凝胶光催化剂（CeO ₂ @ rGO-TG）降解约91％MB，为游离形式CeO ₂ @rGO的一半。更重要的是，CeO ₂ @ rGO-TG可以很容易地从染料溶液中分离出来，并重新用于多个降解循环。