活性焦吸附处理五氯酚钠废水

Adsorption of sodium pentachlorophenate wastewater on activated coke

以活性焦为吸附剂,采用静态吸附实验考察活性焦对PCP-Na模拟废水的吸附性能,研究了反应时间、温度、p H值、活性焦用量对吸附效果的影响,采用急性毒性法评价吸附前后废水急性毒性的变化.结果表明,在原始p H下,温度40℃,活性焦用量4 g·L-1,反应时间180 min时,废水中PCP-Na的浓度由100 mg·L-1降为2.92 mg·L-1,去除率97.07%.吸附后废水的急性毒性下降99.09%.PCP-Na在活性焦表面的吸附是拟二级反应,吸附速率常数为2.52×10-2g·mg-1·min-1,其吸附行为可用Langmuir等温线模型进行描述;热力学计算结果表明吸附反应是自发和吸热过程.

Sodium pentachlorophenate（ PCP-Na） wastewater is highly toxic and poorly degradable.Static adsorption test was conducted to investigate the adsorption properties of activated coke（ AC）for treatment of PCP-Na simulated wastewater. The effect of contact time,temperature,p H and activated coke dosage on PCP-Na removal was studied. Under the conditions of initial p H and 40 ℃,the concentration of PCP-Na decreased from 100 to 2. 92 mg·L- 1after 180 min of contact with the AC dosage of 4g·L- 1,The acute toxicity was reduced by 99. 09% after adsorption. The adsorption kinetics of PCP-Na on AC was coincident with pseudo second- order and the rate constant was 2. 52 ×10- 2g·mg- 1·min- 1. The Langmuir isotherm can be used to describe the adsorption process. The thermodynamic analytical results indicated that the adsorption was spontaneous and endothermic.