微波-载铜活性炭催化氧化降解腐殖酸

Degradation of humic acid by microwave-Cu loaded activated carbon catalytic oxidation

以粉末活性炭（PAC）和颗粒活性炭（GAC）为载体,采用浸渍焙烧法制备了负载铜氧化物的活性炭催化剂,考察了其表面结构、元素组成及BET参数;以腐殖酸模拟废水为对象,研究了微波-载铜活性炭催化氧化降解腐殖酸的效果和影响因素,探讨了微波-催化氧化协同H2O2降解腐殖酸的机理.结果表明,载铜活性炭比未负载铜的活性炭对腐殖酸的降解率更高,且Cu/PAC的催化效果远优于Cu/GAC,两种催化剂最佳的微波-催化氧化条件分别为Cu/PAC投加量1 g/L,H2O2投加量0.9 m L/L,pH=3,微波功率400 W,微波时间4 min和Cu/GAC投加量8 g/L,H2O2投加量1.5 m L/L,pH=6,微波功率400 W,微波时间4 min,该条件下腐殖酸的去除率分别为93.91%和91.59%.微波、H2O2和催化剂协同作用对腐殖酸高效降解有决定性作用.

The catalysts of Cu/powder activated carbon（PAC） and Cu/granular activated carbon（GAC） were prepared and used to degradation humic acid（HA） in microwave catalytic oxidation process. The catalysts were characterized. The effects of catalyst dosage, H2 O2 dosage, pH, microwave power and irradiation time on the degradation rate were studied. The mechanism of HA degradation under microwave-catalytic oxidation combined with H2 O2 was suggested. The results showed that degradation rates of HA reached 93.91% and 91.59% using Cu/PAC and Cu/GAC as catalysts, respectively under the optimal conditions of Cu/PAC dosage of 1 g/L, H2 O2 dosage of 0.9 mL/L, pH 3, microwave power of 400 W, irradiation time 4 min, and Cu/GAC dosage of 8 g/L, H2 O2 dosage of 1.5 mL/L, pH 6, microwave power of 400 W, and irradiation time 4 min, respectively. A synergistic effect of catalyst, microwave, and H2 O2 contributes to the high degradation rate of HA.