Zhang Yu, Gu Yan, Yang Hui, He Yan, Li Rui-Ping, Huang Ying-Ping, Zhang Ai-Qing
China Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three University, Yichang 443002, China.
Huan Jing Ke Xue. 2012 Apr;33(4):1247-51.
Hematite was used as the catalyst to degrade the rhodamine B and 2,4-dichlorophenol under visible light irradiation. The effect of pH, catalyst dosage and dissolved iron on the degradation efficiency were studied. UV-Vis spectrophotometer, infrared spectrometer, fluorescence spectrophotometry and the chemical oxygen demand (COD) were employed to evaluate the mechanism during the degradation process. The result indicated that RhB could be degraded effectively by the Cata/RhB/H2O2/vis system. The optimum conditions were 0.6 g x L(-1) catalyst; pH 3.0 and 1.5 x 10(-3) mol x L(-1) H2O2. RhB was decomposed after 180 min and 56% of 2,4-DCP was degraded after 24 h by this syetem. Dissolved Fe ion was a relatively weak factor for the catalyst system. The catalyst had excellent stability with little loss of activity after 6 recycling experiments. The degradation process was dominated by the hydroxyl radical (*OH) generated in the heterogeneous Fenton-like system.
以赤铁矿为催化剂，在可见光照射下对罗丹明B和2,4 - 二氯苯酚进行降解。研究了pH值、催化剂用量和溶解铁对降解效率的影响。采用紫外 - 可见分光光度计、红外光谱仪、荧光分光光度法和化学需氧量（COD）来评估降解过程中的机理。结果表明，在Cata/RhB/H₂O₂/vis体系中罗丹明B能有效降解。最佳条件为：催化剂0.6 g·L⁻¹；pH值3.0，H₂O₂浓度1.5×10⁻³ mol·L⁻¹。在此体系下，180分钟后罗丹明B分解，24小时后2,4 - 二氯苯酚降解了56%。溶解铁离子对该催化体系影响相对较小。经过6次循环实验后，催化剂具有优异的稳定性，活性损失很小。降解过程主要由类Fenton异相体系中产生的羟基自由基（·OH）主导。
