Discoloration and mineralization of Reactive Red HE-3B by heterogeneous photo-Fenton reaction.
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.
Feng
Jiyun
J
Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Hu
Xijun
X
Yue
Po Lock
PL
Zhu
Huai Yong
HY
Lu
Gao Qing
GQ
D000538:Aluminum Silicates; D000077215:Clay; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009281:Naphthalenes / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D014227:Triazines / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D000538:Aluminum Silicates; D004396:Coloring Agents; C045076:Fenton's reagent; D009281:Naphthalenes; D016877:Oxidants; C479539:Reactive Red HE-3B; D014227:Triazines; D006861:Hydrogen Peroxide; D007501:Iron; D000077215:Clay