Bisphenol A (BPA) is an endocrine disruptor, and removing it from contaminated water is a major environmental concern. Herein, graphene derivatives such as graphene (G), graphene oxide (GO), and reduced graphene oxide (rGO) supported silica-zirconia (SZ) were successfully synthesized for photodegradation of BPA. The photodegradation of BPA was ordered as follows: rGO/SZ (88%)>GO/SZ (63%)>G/SZ (58%)>SZ (55%). This is because rGO has bigger regions for π-π stacking and less negatively charged carboxyl groups, which BPA has a higher adsorption affinity than GO. In addition, the highest degradation is predominantly due to the high number of carbon-support interactions and defects sites, including oxygen vacancy. This encouraged effective mobility of charge carriers and subsequently enhanced photoactivity. In this study, the rGO/SZ catalyst was chosen to optimize further the reaction parameters including catalyst dosage, pH and initial concentration of BPA. According to the analysis of variance, the catalyst dosage was the most important variable in the degradation of BPA, followed by pH and initial concentration. The optimum BPA degradation predicted from response surface methodology is 88% at conditions of 8.09 mg L⁻¹ using 0.469 g L⁻¹ of rGO/SZ at pH 6.1, which is reasonably close to the predicted value (89.8%). The rGO/SZ catalyst was found to be stable even after five cycles in the reusability testing.

双酚 A (BPA) 是一种内分泌干扰物，将其从受污染的水中去除是一个主要的环境问题。在此，成功合成了石墨烯衍生物，如石墨烯 (G)、氧化石墨烯 (GO) 和还原氧化石墨烯 (rGO) 负载的二氧化硅-氧化锆 (SZ)，用于光降解 BPA。BPA的光降解顺序如下：rGO/SZ（88%）>GO/SZ（63%）>G/SZ（58%）>SZ（55%）。这是因为 rGO 具有更大的 π-π 堆积区域和更少的带负电荷的羧基，BPA 比 GO 具有更高的吸附亲和力。此外，最大的降解主要是由于大量的碳-载体相互作用和缺陷位点，包括氧空位。这促进了电荷载流子的有效迁移，随后增强了光活性。在这项研究中，选择 rGO/SZ 催化剂以进一步优化反应参数，包括催化剂用量、pH 值和 BPA 的初始浓度。根据方差分析，催化剂用量是降解 BPA 的最重要变量，其次是 pH 值和初始浓度。在 8.09 mg L 的条件下，响应面方法预测的最佳 BPA 降解率为 88%^-1在 pH 6.1 下使用 0.469 g L ^-1的 rGO/SZ，这与预测值 (89.8%) 相当接近。rGO/SZ 催化剂即使在重复使用性测试中经过 5 个循环后仍保持稳定。