CAJ | 학술논문

以天然大麻杆为原料,采用磷酸活化法制备大麻杆活性炭.利用低温氮吸附对样品的比表面积与孔结构进行了表征,并利用亚甲基蓝与甲基橙两种染料对活性炭在液相中的吸附行为进行了研究.结果表明,样品的比表面积与中孔孔容随着活化温度的升高而增大,在500℃时达到最大值1325.73m~2/g,随后由于磷酸过度活化导致结构坍塌致使各参数有所降低;在25℃下,大麻杆活性炭对亚甲基蓝与甲基橙的吸附等温线均遵循Langmuir方程,单层吸附量分别达到471.698 mg/g和363.64 mg/g,吸附量主要受微孔孔容、染料分子尺寸及染料分子与活性炭表面作用力三者的共同影响.吸附动力学能够很好的符合准二级动力学方程,且亚甲基蓝的吸附速率高于甲基橙.
이천연대마간위원료,채용린산활화법제비대마간활성탄.이용저온담흡부대양품적비표면적여공결구진행료표정,병이용아갑기람여갑기등량충염료대활성탄재액상중적흡부행위진행료연구.결과표명,양품적비표면적여중공공용수착활화온도적승고이증대,재500℃시체도최대치1325.73m~2/g,수후유우린산과도활화도치결구담탑치사각삼수유소강저;재25℃하,대마간활성탄대아갑기람여갑기등적흡부등온선균준순Langmuir방정,단층흡부량분별체도471.698 mg/g화363.64 mg/g,흡부량주요수미공공용、염료분자척촌급염료분자여활성탄표면작용력삼자적공동영향.흡부동역학능구흔호적부합준이급동역학방정,차아갑기람적흡부속솔고우갑기등.
Hemp haulm has been used to prepare activated carbon samples by phosphoric acid activation at different activation temperatures.The BET surface area and pore properties were characterized by using N_2 adsorption iso-therms.Methylene blue (MB) and methyl orange (MO) were used to investigate the liquid adsorption of the hemp haulm based-activated carbon materials.The results show that the BET surface area and mesopore volume initially increased with increasing activation temperature,with the surface area reaching a maximum value of 1325.73 m~2/g at 500℃,and then decreased due to collapse of the structure.The adsorption equilibria of both dyes on the activa-ted carbon materials were fitted to the Langmuir equation with the monolayer sorption capacity for MB and MO being 471.698 mg/g and 363.64 mg/g,respectively.The adsorption capacity is determined by the micropore volume,dye molecule size and the surface force between the activated carbon and the dyes.The adsorption kinetics of the dyes can be well described by the pseudo-second-order equation,and the adsorption rate of MB is higher than that of MO.