Feng Jiyun, Hu Xijun, Yue Po Lock, Zhu Huai Yong, Lu Gao Qing
Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Water Res. 2003 Sep;37(15):3776-84. doi: 10.1016/S0043-1354(03)00268-9.
Discoloration and mineralization of Reactive Red HE-3B were studied by using a laponite clay-based Fe nanocomposite (Fe-Lap-RD) as a heterogeneous catalyst in the presence of H2O2 and UV light. Our experimental results clearly indicate that Fe-Lap-RD mainly consists of Fe2O3 (meghemite) and Fe2Si4O10(OH)2 (iron silicate hydroxide) which have tetragonal and monoclinic structures, respectively, and has a high specific surface area (472 m2/g) as well as a high total pore volume (0.547 cm3/g). It was observed that discoloration of HE-3B undergoes a much faster kinetics than mineralization of HE-3B. It was also found that initial HE-3B concentration, H2O2 concentration, UV light wavelength and power, and Fe-Lap-RD catalyst loading are the four main factors that can significantly influence the mineralization of HE-3B. At optimal conditions, complete discoloration of 100 mg/L HE-3B can be achieved in 30 min and the total organic carbon removal ratio can attain 76% in 120 min, illustrating that Fe-Lap-RD has a high photo-catalytic activity in the photo-assisted discoloration and mineralization of HE-3B in the presence of UV light (254 nm) and H2O2.
以锂皂石粘土基铁纳米复合材料（Fe-Lap-RD）作为多相催化剂，在过氧化氢和紫外光存在的条件下，对活性红HE-3B的脱色和矿化进行了研究。我们的实验结果清楚地表明，Fe-Lap-RD主要由分别具有四方结构和单斜结构的Fe2O3（磁赤铁矿）和Fe2Si4O10(OH)2（硅酸氢氧化铁）组成，具有较高的比表面积（472 m2/g）以及较高的总孔体积（0.547 cm3/g）。观察到HE-3B的脱色动力学比其矿化动力学快得多。还发现初始HE-3B浓度、过氧化氢浓度、紫外光波长和功率以及Fe-Lap-RD催化剂负载量是能显著影响HE-3B矿化的四个主要因素。在最佳条件下，100 mg/L的HE-3B在30分钟内可实现完全脱色，120分钟内总有机碳去除率可达76%，这表明在紫外光（254 nm）和过氧化氢存在的情况下，Fe-Lap-RD在HE-3B的光辅助脱色和矿化过程中具有较高的光催化活性。
