竹炭对溶液中对硝基苯酚的吸附性能

Adsorption of p-Nitrophenol in Aqueous Solution by Bamboo-Carbon

研究对硝基苯酚在竹炭上的吸附能力以及粒径、吸附pH值、吸附平衡时间、竹炭投加量、吸附温度等因素对竹炭吸附对硝基苯酚的影响。结果表明:10℃下,20.0g平均粒径为0.106～0.090mm的竹炭振荡吸附处理1L初始浓度为50mg.L-1的对硝基苯酚水样120min后,对硝基苯酚最大吸附率可达82.5%,最大吸附量为2.06mg.g-1;竹炭粒径、竹炭投加量、吸附时间等因素对竹炭吸附能力有明显影响;酸性条件下对硝基苯酚的吸附率明显高于中性和碱性条件;升高温度不利于对硝基苯酚在竹炭上的吸附;Freundlich模型能较好地描述对硝基苯酚在竹炭上的吸附过程。

The adsorption ability of p-nitrophenol by bamboo-carbon was studied. The effects of various parameters such as particle size, pH value, adsorption time, absorbent dosage and adsorption temperature on p-nitrophenol adsorption efficiency of bamboo-carbon were investigated. The results showed that the adsorption ratio of p-nitrophenol and adsorption amount could reach 82.5% and 2.06 mg· g^-1 respectively, under the condition such as 10 ℃, p-nitrophenol concentration 50 mg· L^-1, bamboo-carbon size 0.106 - 0.090 mm, bamboo-carbon dosage 20.0 g· L^-1, adsorption time 120 min. The adsorption performance of bamboo-carbon was obviously affected by such parameters as particle size, adsorption time, bamboo-carbon dosage. The adsorption ratio was higher in acid solution than in neutral or alkaline solution. Higher temperature was not favorable to the adsorption of p-nitrophenol by bamboo-carbon. The adsorption behavior of the bamboo-carbon for p-nitrophenol obeys the Freundlich isotherm model.