CAJ | 학술논문

在固定床吸附反应器内对一种商业活性炭进行了汞吸附实验，考察了入口汞浓度和吸附温度对活性炭吸附汞的影响。采用4个简化的吸附动力学模型，即内扩散模型、准一阶和准二阶动力学模型，耶洛维奇(Elovich)模型从动力学的角度探讨了入口汞浓度和吸附温度对汞吸附的影响机制。分析了汞吸附过程的机制和控制过程。结果表明：入口汞浓度的增加，或者吸附温度的降低，均有利于活性炭对汞的吸附，其主要原因是提高了颗粒内扩散速率、初始吸附速率以及准一级反应速率。汞吸附过程主要由化学吸附控制，主要分为表面吸附和内扩散吸附2个阶段，初始吸附阶段呈现较快吸附速率，该阶段和表面吸附有关；随着表面活性位被占据，颗粒内扩散起主要控制作用，吸附速率下降。
재고정상흡부반응기내대일충상업활성탄진행료홍흡부실험，고찰료입구홍농도화흡부온도대활성탄흡부홍적영향。채용4개간화적흡부동역학모형，즉내확산모형、준일계화준이계동역학모형，야락유기(Elovich)모형종동역학적각도탐토료입구홍농도화흡부온도대홍흡부적영향궤제。분석료홍흡부과정적궤제화공제과정。결과표명：입구홍농도적증가，혹자흡부온도적강저，균유리우활성탄대홍적흡부，기주요원인시제고료과립내확산속솔、초시흡부속솔이급준일급반응속솔。홍흡부과정주요유화학흡부공제，주요분위표면흡부화내확산흡부2개계단，초시흡부계단정현교쾌흡부속솔，해계단화표면흡부유관；수착표면활성위피점거，과립내확산기주요공제작용，흡부속솔하강。
An experimental study on mercury adsorption of a commercial activated carbon was carried out in a fixed-bed reactor. The effects of inlet mercury concentration and temperature on mercury adsorption efficiency were explored. Four simplified adsorption kinetic models, including intraparticle diffusion model, pseudo-first and pseudo-second order kinetic models, and Elovich model, were used to investigate the mechanism of mercury adsorption, adsorption rate, and the controlling process from the kinetic point of view. The results show that the increase of inlet mercury concentration or the decrease of temperature is beneficial to promoting the mercury adsorption capacity, due to the enhancement of intraparticle diffusion rate, initial adsorption rate, and pseudo-first order reaction rate. The mercury adsorption process is controlled dominantly by chemisorption, which comprises two steps:surface adsorption and intraparticle diffusion adsorption. The Hg0 adsorption rate is higher in the initial stage, which is determined by the surface adsorption. After that the adsorption rate drops continuously as the surface active sites are occupied and the intraparticle diffusion dominates the adsorption.