The aim of this study was to evaluate the efficiency of photocatalytic ozonation process using graphene-dioxide titanium nanocomposite in removing Pentachlorophenol (PCP) from aqueous solutions. In this study, nanocomposites with graphene to TiO₂(G/T) ratios of 1:10 and 1:20 were synthesized by hydrothermal method, and its characteristics were assessed using various analyses, SEM, XRD, FTIR, TEM, BET and TGA. In this process, the effects of parameters including O₃ concentration (0.25–1.25 mg/L), nanocomposite concentration (50–500 mg/L), initial PCP concentration (10–100 mg/L), and time (10–60 min), were studied. The results showed that PCP removal efficiency was increased by decreasing solute concentration. Increasing nanocomposite dose to 100 mg/L was led to an increase in efficiency (99.1%), but then a decreasing trend was observed. Increasing the concentration of ozone, up to specific value, also enhanced the efficiency but then had a negative effect on process efficiency. Furthermore, the optimum ratio of the catalyst was determined to be 1:20. The highest efficiency of the process for initial pentachlorophenol concentration of 100 mg/L was obtained 98.82% in optimum conditions (catalyst dose of 100 mg/L and 60 min). It is concluded that the photocatalytic ozonation process using graphene-dioxide titanium nanocomposite had the highest efficiency in removal and mineralization of PCP.

本研究的目的是评估使用石墨烯-二氧化钛纳米复合材料的光催化臭氧化过程从水溶液中去除五氯苯酚（PCP）的效率。在本研究中，通过水热法合成了石墨烯与TiO ₂ (G/T)比例为1:10和1:20的纳米复合材料，并使用各种分析、SEM、XRD、FTIR、TEM、BET和TGA评估了其特性。在此过程中，O ₃浓度（0.25–1.25 mg/L）、纳米复合材料浓度（50–500 mg/L）、PCP初始浓度（10–100 mg/L）和时间（10–60 mg/L）等参数的影响分钟），进行了研究。结果表明，降低溶质浓度可提高五氯苯酚的去除效率。将纳米复合材料剂量增加到 100 mg/L 会导致效率增加 (99.1%)，但随后观察到下降趋势。将臭氧浓度增加到特定值也可以提高效率，但会对过程效率产生负面影响。进一步确定催化剂的最佳配比为1:20。在最佳条件下（催化剂剂量100 mg/L，60 min），初始五氯苯酚浓度为100 mg/L时，该工艺的最高效率为98.82%。结论是，使用石墨烯-二氧化钛纳米复合材料的光催化臭氧化工艺对五氯苯酚的去除和矿化具有最高的效率。