活性炭吸附硝基苯酚同分异构体的研究

The Adsorption Performance of Activated Carbon for Nitro Phenol Isomers

研究吸附条件对活性炭吸附硝基苯酚同分异构体的影响。结果表明:25℃,中性条件下,活性炭对邻硝基苯酚、间硝基苯酚和对硝基苯酚最高吸附量分别为676.03、475.17和449.56 mg/g。邻硝基苯酚的吸附行为与另两种异构体存在较大差异。升高温度利于活性炭对邻硝基苯酚的吸附。酸性条件下,吸附量高低顺序为邻硝基苯酚>对硝基苯酚>间硝基苯酚;pH值增大利于活性炭对间硝基苯酚的吸附。硝基苯酚的吸附等温线基本符合Langmuir方程,为单分子层吸附。

Adsorption performance of activated carbon for nitro phenol isomers was investigated. The results showed that the highest adsorption capacity of o-nitrophenol ,m-nitrophenol, p-nitrophenol on activated carbon are 676.03,475.17 and 449.56 mg/g under the temperature of 25 ℃ and neutral conditions, respectively. The adsorption behavior of o-nitrophenol on activated carbon is different from the other two isomers. With the increasing of temperature, adsorption of o-nitrophenol in activated carbon was also increased. Under the acidic conditions, the adsorption amount of nitro phenol isomers was in the order of oonitrophenol 〉 p-nitrophenol 〉 m-nitrophenol. Adsorption of m-nitrophenol can be improved in activated carbon by increasing the pH value. The adsorption isotherms of nitro phenol strictly accord with Langmuir equation, which is a single molecule layer absorption.