酸处理玉米芯对水中藏红T的吸附研究  

Adsorption of Safranine T in solution by acid-treated corncob

作　　者：熊晓莉 XIONG Xiao-li(College of Environment and Resource,Chongqing Technology and Business University,Chongqing 400067,China)

机构地区：[1]重庆工商大学环境与资源学院,重庆400067

出　　处：《应用化工》2020年第7期1679-1682,共4页Applied Chemical Industry

基　　金：国家自然科学基金(20907076)。

摘　　要：将稀硫酸改性的玉米芯(MC)用于去除水中低浓度的藏红T(ST),研究了吸附时间、吸附质初始浓度、吸附剂的量等影响因素对去除率的影响,用热力学和动力学模型拟合了ST在MC上的吸附行为。结果表明,MC对水溶液中低浓度的藏红T的去除率最多可达98%以上。吸附动力学符合Weber-Morriss动力模型,吸附速率控制步骤为粒内扩散控制。吸附等温式符合Langmuir模型,吉布斯自由能为负值,为热力学自发过程。改性玉米芯对水溶液中ST的去除具有良好的效果。Modified corncob(MC)by dilute sulfuric acid was used for remove Safranine T(ST)in the solution.The effects of various experimental parameters,such as adsorption time,initial concentration of adsorbate and amount of adsorbent were studied.The adsorption behavior of ST on MC was fitted by thermodynamic and kinetic models.The results show that the removal rate of low concentration Safranine T by MC in aqueous solution was even up to 98%.Adsorption kinetics followed the Weber-Morriss equation in the concentration range studied.Intraparticle diffusion was the rate-controlling step.Equilibrium isotherm data were satisfactorily fitted by the Langmuir equation.The negative values of Gibbs free energy change indicated the spontaneous nature of adsorption.This study confirmed that modified corncob was an excellent attractive adsorbent for removal of ST from aqueous solution.

关 键 词：藏红T 改性玉米芯 吸附 动力学 热力学参数 

分 类 号：TQ44[化学工程—化学肥料工业]