摘要
以农业废弃物玉米芯为原料,用K2CO3作为活化剂制备玉米芯基多孔炭.利用XRD、FT-IR、SEM和BET解析玉米芯基多孔炭的孔结构和表面特性,并探究其对甲基蓝、结晶紫和靛蓝二磺酸钠的去除效果.玉米芯基多孔炭对3种染料都具有良好的吸附能力,其中对结晶紫染料的吸附能力最佳.通过吸附热力学机理分析,证实该吸附过程为 自发的吸热过程.玉米芯基多孔炭吸附3种染料的过程符合准二级动力学模型、颗粒内扩散模型和Lang-muir 等温吸附模型,证实该吸附过程是受化学机制控制的单分子层吸附过程.
Abstract
Corncob-based porous carbon was prepared from corncob,an agricultural waste,using K2CO3 as an activator.X-ray diffraction(XRD),Fourier Transform infrared spectroscopy(FT-IR),Scanning elec-tron microscope(SEM)and BET were used to analyses the pore structure and surface properties of the corncob-based porous carbon,and to investigate the removal effects on methyl blue,crystal violet and in-digotindisulfonate sodium.The optimum adsorption conditions for the removal of methyl blue,crystal vio-let and indigotindisulfonate sodium were determined.Corncob-based porous carbon has good adsorption capacity for all three dyes,but the best adsorption capacity for crystal violet dye.The adsorption thermo-dynamic mechanism analysis confirmed that the adsorption process was a spontaneous heat absorption process.The adsorption of the three dyes on corncob-based porous carbon was consistent with the quasi-secondary kinetic model,the intra-particle diffusion model,and the Langmuir isothermal adsorption mod-el,confirming that the adsorption process was a monomolecular layer adsorption process controlled by chemical mechanisms.
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