活性炭吸附二苯并呋喃的动力学

采用Norit RB1和Monolith两种活性炭吸附气相中低浓度的二苯并呋喃,测定了二苯并呋喃在2种活性炭上的吸附等温线和吸附动力学曲线,分析了气相主体浓度、温度和二苯并呋喃初始浓度等因素对固相有效扩散系数的影响.结果表明,Langmuir吸附等温线模型能够比较准确地描述二苯并呋喃在Norit-RB1和Monolith活性炭上的吸附相平衡;二苯并呋喃在活性炭上的吸附速率受固相扩散控制;固相有效扩散系数随温度的升高而增大,气相浓度和二苯并呋喃初始浓度对固相有效扩散系数影响较小.

Adsorption kinetics of dibenzofuran on activated carbon

A gravimetric method was adopted to calculate the adsorption isotherm and kinetic curves of dibenzofuran with Norit RB1 and Monolith activated carbon. The kinetic curves were fitted by solid phase diffusion model to calculate the mass transfer coefficient and diffusion coefficient. The effects of bulk gas concentration, adsorption temperature and initial solid phase concentration on the diffusion coefficient were also analyzed. The results showed that the isotherm data were well fitted by the Langmuir equation under the studied conditions. The adsorption rate of dibenzofuran on the Norit RB1 and Monolith activated carbon was mainly controlled by solid surface diffusion. The higher the adsorption temperature was, the larger the mass diffusion coefficient was. The effects of bulk gas concentration and solid concentration of dibenzofuran on diffusion coefficient were very small.