双酚A型环氧树脂合成工艺废料活性炭的制备及表征

Preparation and characterization of activated carbon from bisphenol A epoxy resin synthesis process waste

以双酚A型环氧树脂合成工艺中的液固废料为原料,通过化学活化法制备高吸附性能活性炭。考察了活化剂种类、原料液固比、活化温度、活化时间和浸渍比对活性炭得率及吸附性能的影响。结果表明,以KOH为最佳活化剂,原料液固质量比3∶7、浸渍比1、活化温度800℃、活化时间60 min条件下制备出的活性炭得率为35.28%,亚甲基蓝吸附量为1 531 mg/g。利用BET、SEM、FTIR、XRD、Bohem滴定对活性炭的形貌结构、表面官能团等进行表征。活性炭呈非晶形态,且表面分布着发达的孔隙结构,比表面积为1 693 m^(2)/g,总孔容为0.754 0 cm^(3)/g,平均孔径为1.782 nm,微孔容占总孔的82.73%。FTIR和Bohem滴定显示,活性炭表面含有酚羟基、醇羟基等含氧官能团,其总酸度为3.34 mmol。

Using the liquid-solid waste in the synthesis process of bisphenol A epoxy resin as raw material, the activated carbon with high adsorption performance was prepared by chemical activation method.The effects of activator type, raw material liquid-solid ratio, activation temperature, activation time and impregnation ratio on the yield and adsorption performance of activated carbon were investigated.The results showed that with KOH as the best activator, the activated carbon prepared under the conditions of raw material liquid-solid mass ratio of 3∶7,impregnation ratio of 1,activation temperature of 800 ℃,and activation time of 60 min was 35.28% in yield, and the adsorption capacity of methylene blue was 1 531 mg/g.The morphology, structure and surface functional groups of activated carbon were characterized by BET,SEM,FTIR,XRD,Bohem titration and other means.It can be seen that the activated carbon is amorphous and has a well-developed pore structure on the surface.The specific surface area is 1 693 m^(2)/g, the total pore volume is 0.754 0 cm^(3)/g, the average pore diameter is 1.782 nm, and the micropore volume accounts for 82.73% of the total pores.The results of FTIR and Bohem titration showed that the surface of activated carbon contained oxygen-containing functional groups such as phenolic hydroxyl group and alcoholic hydroxyl group, and its total acidity was 3.34 mmol.