Photodegradation of organic pollutants strongly depends on design of metal oxide semiconductor photocatalysts. Graphene, if composited with ZnO, can effectively enhance its photocatalytic performance for the eradication of pollutants from aqueous medium. Here in, ZnO‐rGO is reported as highly active catalyst for degradation of methylene blue. A 200‐mg/L solution of methylene blue dye was completely degraded within 1 h in comparison to 74% and 56% degradation over ZnO and rGO, respectively. The commonly used mechanisms of heterogeneous catalytic reactions, the Langmuir‐Hinshelwood mechanism, and the Eley‐Rideal mechanisms, were used to describe the reaction kinetics. The Langmuir‐Hinshelwood mechanism was found as more favorable in this study. Apparent activation energy, E_ap, true activation energy, E_T, entropy, ΔS, and enthalpy, ΔH were calculated as 36.2 kJ/mol, 13.1 kJ/mol, 197.5 J/mol, and 23.1 kJ/mol, respectively.

中文翻译：

---

ZnO-rGO催化亚甲基蓝降解的动力学模型

有机污染物的光降解在很大程度上取决于金属氧化物半导体光催化剂的设计。如果将石墨烯与ZnO复合，则可以有效增强其光催化性能，以消除水性介质中的污染物。在此，据报道，ZnO-rGO是用于降解亚甲基蓝的高活性催化剂。200 mg / L的亚甲蓝染料溶液在1小时内被完全降解，而ZnO和rGO的降解分别为74％和56％。常用的非均相催化反应机理，Langmuir-Hinshelwood机理和Eley-Rideal机理被用来描述反应动力学。在这项研究中发现Langmuir-Hinshelwood机制更为有利。表观活化能，E _ap计算出的真实活化能E _T，熵ΔS和焓ΔH分别为36.2 kJ / mol，13.1 kJ / mol，197.5 J / mol和23.1 kJ / mol。