Xia Guotong, Sun Jie, Yang Wenjin, Wu Gao-Lin, Shen Weibo
College of Natural Environment and Resources, Northwest A&F University, Yangling 712100, China.
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China and Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China E-mail:
Water Sci Technol. 2019 Mar;79(6):1164-1173. doi: 10.2166/wst.2019.114.
The removal of methyl orange (MO) in a copper-loaded silicon carbide (Cu/SiC) system under microwave (MW) irradiation was studied. Cu/SiC was synthesized by employing an impregnation method and the effects of parameters such as reaction time, catalyst dosage, hydrogen peroxide (HO) dosage, microwave power and pH on the rate of degradation of MO were also studied. The obtained results showed that almost complete degradation was obtained in the presence of Cu/SiC catalyst within 8 min of irradiation when 100 mL of MO solution (20 mg/L), 3 ml/L of HO, 2 g/L of catalyst dose, 600 W of MW power, and pH 7 were applied. The Cu-bearing catalyst with HO formed a Fenton-like system and the rate of generation of hydroxyl radicals (·OH) was also accelerated by subjecting to MW. From the kinetic analysis, it is revealed that the degradation of MO using the MW-Cu/SiC-HO system follows the pseudo-first-order.
研究了在微波（MW）辐照下，负载铜的碳化硅（Cu/SiC）体系中甲基橙（MO）的去除情况。采用浸渍法合成了Cu/SiC，并研究了反应时间、催化剂用量、过氧化氢（HO）用量、微波功率和pH值等参数对MO降解速率的影响。所得结果表明，当使用100 mL的MO溶液（20 mg/L）、3 ml/L的HO、2 g/L的催化剂用量、600 W的微波功率和pH值为7时，在Cu/SiC催化剂存在下，辐照8分钟内MO几乎完全降解。含铜催化剂与HO形成了类芬顿体系，并且通过微波作用，羟基自由基（·OH）的生成速率也加快了。从动力学分析可知，MW-Cu/SiC-HO体系中MO的降解遵循准一级反应。
