FeCl_3改性活性炭对罗丹明B的吸附性能

Adsorption of Rhodamine B on activated carbon modified by FeCl_3

分析经FeCl_3改性的活性炭在不同条件下对罗丹明B的吸附性能.以浸渍-加热的方法对活性炭进行改性处理,比较改性前后活性炭对罗丹明B的吸附量及溶液的pH、温度对吸附效果的影响,吸附动力学以及等温吸附规律.结果表明,吸附时间为60 min时,FeCl_3改性活性炭较未改性活性炭对罗丹明B的吸附量提高了14%;pH=2时,吸附能力最大,pH值在2~8内,载铁活性炭吸附能力随着pH逐渐升高呈下降趋势;pH=10时,吸附能力显著升高;该反应为吸热反应,罗丹明B吸附量随着温度的升高而升高,Freundlich吸附等温线和准一阶动力学模型更适合于描述载铁活性炭对罗丹明B的吸附.

To study the adsorption capacity of Rhodamine B by FeC13 modified activated carbon under different condition, modified granular activated carbon was prepared by FeC13 solution using immersion-heating technique. Adsorption capacity was compared, and change of Rhodamine B adsorption performance by means of pH, temperature was investigated. The results show that adsorption capacity of Rhodamine B by modified activated carbon was 14 % higher than that by activated carbon when adsorption time is 60 rain. Rhodamine B adsorption capacity increases significantly. Adsorption capacity of Rhodamine B is the highest when pH is 2. As the pH value ranges from 2 to 8, adsorption capacity decreases with the increase of pH value. Adsorption capacity for Rhodamine B significantly increases when pH is 10. Adsorption capacity increases with the rise of temperature. Freundlich adsorption isotherm and the first-order kinet- ic model are more suitable to describe the adsorption of Rhodamine B on iron-containing activated carbon.