In present work, graphitic carbon nitrite (g-CN) homojunction was synthesized and coated onto 3D-printed photoreactor for the removal of Rhodamine B (RhB) dye. The photocatalysis and adsorption experiments were investigated for 6 h under visible light irradiation and in the dark, respectively. The experimental parameters were flow rate of dye solution (1.0 – 3.0 mL/min), initial dye concentration (5.0 – 15.0 ppm), and number of photoreactors (2 – 6). The adsorption mechanisms were subsequently evaluated using isotherm and kinetics modelling. Redlich-Peterson (R-P) model showed the best fitted result with a relatively high coefficient value (R = 0.9908) followed by Langmuir isotherm model (R = 0.9822). The separation factor () has revealed that the adsorption process is favourable ( = 0.05). Besides, the adsorption experimental result is approaching the pseudo-second-order kinetics model (R = 0.9898). The dye removal under light irradiation were investigated using 15 sets of experiments designed by Box-Behnken design. A second order-regression equation was developed to assess the performance of dye degradation. The predicted response is in good agreement with the experimental response, with deviation less than 3.50 %. In this case, the regression analysis concluded that the significance of the single effect followed the order of: number of photoreactor (p = 0.000) > flow rate of dye solution (p = 0.051) > dye initial concentration (p = 0.649). Besides, the analysis of variance (ANOVA) study showed that the interactions between parameters were insignificant. In short, the development of g-CN homojunction photocatalyst has provided an innovative approach for environmental remediation, in particular wastewater management.

中文翻译：

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用于水修复的具有固定热固性丙烯酸-石墨氮化碳纳米片的增材制造光反应器：响应面方法和吸附建模研究


在目前的工作中，合成了石墨亚硝酸碳（g-CN）同质结并将其涂覆到3D打印的光反应器上以去除罗丹明B（RhB）染料。光催化和吸附实验分别在可见光照射和黑暗条件下进行6小时。实验参数为染料溶液的流速（1.0 – 3.0 mL/min）、初始染料浓度（5.0 – 15.0 ppm）和光反应器的数量（2 – 6）。随后使用等温线和动力学模型评估吸附机制。 Redlich-Peterson (RP) 模型显示出最佳拟合结果，具有相对较高的系数值 (R = 0.9908)，其次是 Langmuir 等温线模型 (R = 0.9822)。分离因子()表明吸附过程是有利的(=0.05)。此外，吸附实验结果接近准二级动力学模型（R = 0.9898）。采用 Box-Behnken 设计设计的 15 组实验研究了光照射下的染料去除效果。开发了二阶回归方程来评估染料降解的性能。预测响应与实验响应吻合较好，偏差小于3.50%。在这种情况下，回归分析得出的结论是，单一效应的显着性遵循以下顺序： 光反应器数量 (p = 0.000) > 染料溶液流速 (p = 0.051) > 染料初始浓度 (p = 0.649) 。此外，方差分析（ANOVA）研究表明参数之间的交互作用并不显着。简而言之，g-CN同质结光催化剂的开发为环境修复，特别是废水管理提供了一种创新方法。