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以一种大型海藻——铜藻为原料,Fe Cl3·6H2O为活化剂,采用超声浸渍-原位合成法制备了铜藻基载铁活性炭(Fe/SAC),并以活性炭得率和亚甲基蓝吸附值为指标,通过正交法考察了活化温度、活化时间和浸渍比的影响.同时,采用X射线衍射、扫描电镜和比表面积分析仪对最优结果进行表征,并考察了Fe/SAC吸附亚甲基蓝的热力学与动力学特性.结果表明,Fe/SAC的最优制备工艺条件为活化温度600℃、活化时间1 h、浸渍比1∶1,此时的活性炭得率为39.5%,亚甲基蓝吸附值为255.67 mg·g~(-1);最优工艺条件下制得的Fe/SAC比表面积为558.31 m2·g~(-1),其负载的铁组分主要为Fe3O4和Fe O;亚甲基蓝在Fe/SAC上的吸附过程符合准二级动力学模型,Langmuir等温吸附模型能够很好地描述吸附平衡过程,该吸附是熵增加的自发吸热(ΔS>0、ΔG<0、ΔH>0)过程,升温有利于吸附.
Using FeCl3 · 6H2O as activator, a large seaweed-copper algae as raw material, Fe / SAC was prepared by ultrasonic impregnation and in-situ synthesis. The yield of activated carbon and methylene blue adsorption The effects of activation temperature, activation time and impregnation ratio were investigated by orthogonal test.At the same time, the best results were characterized by X-ray diffraction, scanning electron microscopy and surface area analyzer, and the effects of Fe / SAC adsorption on methylene blue The results show that the optimum preparation conditions of Fe / SAC are as follows: activation temperature 600 ℃, activation time 1 h, impregnation ratio 1: 1, activated carbon yield 39.5%, methylene blue adsorption value 255.67 mg · g -1. The specific surface area of Fe / SAC was 558.31 m 2 · g -1 under the optimal conditions. The main iron components were Fe 3 O 4 and FeO. The adsorption process on SAC / SAC accords with the quasi-second-order kinetic model. Langmuir isotherm model can well describe the equilibrium process of adsorption, which is the spontaneous endotherm with increasing entropy (ΔS> 0, ΔG <0, ΔH> 0) , Warming is conducive to adsorption.