School of Material Science & Engineering, Harbin University of Science & Technology, Harbin, 150040, People's Republic of China.
Environ Sci Pollut Res Int. 2013 Aug;20(8):5764-72. doi: 10.1007/s11356-013-1578-0. Epub 2013 Mar 6.
A cationic dye, Rhodamine B (RhB), could be efficiently discolored by heterogeneous Fenton-like reaction catalyzed by natural schorl. In this work, with the main goal of the optimization for RhB discoloration, central composite design under the response surface methodology (RSM) was employed for the experiment design and process optimization. The significance of a second-order polynomial model for predicting the optimal values of RhB discoloration was evaluated by the analysis of variance and 3D response surface and counter plots for the interactions between two variables were constructed. The Pareto graphic analysis of the discoloration process indicated that, among all the variables, solution pH (X 3, 47.95 %) and H2O2 concentration (X 1, 24.39 %) had the largest influences on the heterogeneous Fenton-like discoloration of RhB. Based on the model prediction, the optimum conditions for RhB discoloration were determined to be 45 mM H2O2 concentration, 2.5 g/L schorl dosage, solution pH 2, and 110 min reaction time, with the maximum RhB discoloration ratio of 98.86 %. The corresponding experimental value of RhB discoloration ratio under the optimum conditions was determined as 99.31 %, which is very close to the optimized one, implying that RSM is a powerful and satisfactory strategy for the process optimization.
一种阳离子染料，罗丹明 B（RhB），可以通过天然电气石催化的非均相类 Fenton 反应有效地褪色。在这项工作中，主要目标是优化 RhB 的褪色，采用响应面法（RSM）中的中心复合设计进行实验设计和过程优化。通过方差分析和 3D 响应面以及两个变量之间相互作用的对比图来评估二次多项式模型对 RhB 褪色最佳值的预测的重要性。褪色过程的 Pareto 图形分析表明，在所有变量中，溶液 pH（X3，47.95%）和 H2O2 浓度（X1，24.39%）对 RhB 的非均相类 Fenton 褪色有最大的影响。根据模型预测，确定 RhB 褪色的最佳条件为 45 mM H2O2 浓度、2.5 g/L 电气石剂量、溶液 pH 值 2 和 110 min 反应时间，最大 RhB 褪色率为 98.86%。在最佳条件下 RhB 褪色率的相应实验值确定为 99.31%，非常接近优化值，这表明 RSM 是一种强大且令人满意的工艺优化策略。
