载铜活性炭对含酚废水的吸附性能

Adsorption Property of Copper Loaded Activated Carbon for Phenolic Wastewater Treatment

采用载铜活性炭(Cu/GAC)吸附含酚废水。考察吸附效果、动力学、工艺条件以及再生次数的影响。结果表明:相比微波辐射活性炭(MW/GAC)、载铁活性炭(Fe/GAC)和原始活性炭(GAC),Cu/GAC处理含酚废水的效果更显著;Cu/GAC对对硝基苯酚(4-NP)和苯酚的吸附动力学曲线均可用准二级动力学模型拟合;在酚质量浓度为200 mg/L、试验用水量为200mL、溶液初始pH值为6.0±0.2、Cu/GAC投加量为10.0 g/L、温度为25.0±0.5℃、反应时间为120 min的优化条件下,4-NP和苯酚的去除率分别达到95.2%和89.5%;炭的投加量、酚溶液的初始质量浓度和溶液初始pH对Cu/GAC处理含酚废水均有较显著的影响;经6次再生后,Cu/GAC仍保持较好的去除能力。

Phenolic wastewater was treated by Cu/GAC adsorption. Effects of adsorption, kinetics, process conditions and regeneration times were investigated. Results showed that removal efficiency of phenol by Cu/GAC was more significant than those by MW/GAC, Fe/GAC, and GAC. Kinetic curves of 4-NP and phenol adsorption by Cu/GAC followed the pseudo-second-order model. The optimum conditions of adsorption was determined as follows ： the concentration of phenolic wastewater was 200 mg/L, the volume of test sample was 200 mL, the solution initial pH value was 6. 0±0. 2, the dosage of Cu/GAC was 10. 0 g/L, the temperature was 25.0±0. 5 ℃ , the reaction time was 120 min. The removal rates of 4-NP and phenol were 95.2% and 89. 5%, respectively. The dosage of Cu/GAC, the initial concentration of phenolic wastewater, and the solution initial pH showed great influence on the treatment efficiency by Cu/GAC. Cu/GAC was still stable after being regenerated for six times.