Developing photocatalytic systems by larger design to achieve degradation of dye pollutants by using solar light is highly desirable. Present work is devoted to the synthesis of step-scheme (S-scheme) g-C₃N₄/TiO₂ heterojunction which subsequently employed for simultaneous degradation of a binary mixture of Methylene blue (MB) and Rhodamine B (RhB) solution in parabolic trough collectors (PTC) as continuous flow loop photoreactor. The as-prepared g-C₃N₄/TiO₂ was analyzed by various techniques such as FE-SEM, EDS, XRD, FT-IR, BET, elements mapping and DRS. The composite central design (CCD) was applied to express mathematical relationships among variables such as process time, catalyst mass and initial concentrations of MB and RhB in the degradation process. The photocatalytic activity of the as-prepared composite is higher than pure TiO₂ and g-C₃N₄ that is attributed to the positive synergetic effect of S-scheme between g-C₃N₄ and TiO₂ nanostructure. Under solar irradiation in PTC, g-C₃N₄/TiO₂ was able to degrade about 94.92 and 93.07% of binary mixture MB and RhB, respectively.

通过更大的设计开发光催化系统以通过使用太阳光实现染料污染物的降解是非常可取的。目前的工作致力于合成阶梯式（S-scheme）gC ₃ N ₄ /TiO ₂异质结，随后用于同时降解抛物线槽中亚甲蓝（MB）和罗丹明B（RhB）溶液的二元混合物收集器 (PTC) 作为连续流动回路光反应器。制备的 gC ₃ N ₄ /TiO ₂通过各种技术，如 FE-SEM、EDS、XRD、FT-IR、BET、元素映射和 DRS 进行分析。复合中心设计（CCD）用于表达降解过程中过程时间、催化剂质量和MB和RhB初始浓度等变量之间的数学关系。所制备的复合材料的光催化活性高于纯 TiO ₂和 gC ₃ N ₄，这是由于 gC ₃ N ₄和 TiO ₂纳米结构之间的 S 型协同效应。在PTC中的太阳照射下，gC ₃ N ₄ /TiO ₂ 能够分别降解约 94.92% 和 93.07% 的二元混合物 MB 和 RhB。