Magnetic graphen oxide (Fe₃O₄-GO) is applied for preparation of Fe₃O₄-GO-ZnO (MGOZ) nanocomposite as photocatalyst. The photocatalysts are characterized by FTIR and UV spectrophotometer. FTIR results confirm the presence of Zn–O bonds and Fe–O bonds that are attributed to the ZnO and Fe₃O₄, respectively. The removal efficiency of methyl orange (MO) is compared using MGOZ and Fe₃O₄-ZnO at different irradiation time (ranging from 5 to 40 min) and pH (in the range of 3 to 11). The experimental results show that the removal efficiency of MO using MGOZ and Fe₃O₄-ZnO enhanced with respect to the irradiation time. Meanwhile the lowest and highest removal efficiency are obtained at pH = 7 and pH = 3, respectively. The comparison between removal efficiency of MO using MGOZ and Fe₃O₄-ZnO reveals that GO has a significant effect on the photocatalytic activity. Meanwhile, the removal efficiency of MO using MGOZ is higher than that of Fe₃O₄-ZnO. The statistical analysis of results using design of experiments (DOE) and Duncan’s multiple range test at α = 0.05 confirm that irradiation time, pH and their interactions have a significant effect on the removal efficiency of MO.

磁性氧化石墨（Fe ₃ O ₄ -GO）被用于制备Fe ₃ O ₄ -GO-ZnO（MGOZ）纳米复合材料作为光催化剂。用FTIR和紫外分光光度计对光催化剂进行表征。FTIR结果证实分别存在归因于ZnO和Fe ₃ O ₄的Zn-O键和Fe-O键。使用MGOZ和Fe ₃ O ₄ -ZnO在不同的照射时间（5至40分钟）和pH（3至11）范围内比较甲基橙（MO）的去除效率。实验结果表明，MGOZ和Fe ₃ O ₄去除MO的效率-ZnO相对于照射时间增加。同时，分别在pH = 7和pH = 3时获得最低和最高的去除效率。用MGOZ和Fe ₃ O ₄ -ZnO去除MO的效率的比较表明，GO对光催化活性有显着影响。同时，使用MGOZ去除MO的效率高于Fe ₃ O ₄ -ZnO。使用实验设计（DOE）和Duncan多范围测试在α= 0.05时对结果进行统计分析，证实辐照时间，pH及其相互作用对MO的去除效率有重要影响。