乙基纤维素包覆成型活性炭的制备及其性能研究

摘要

The coated liquid was prepared with ethyl cellulose as coating material and ethanol as the solvent by dissolving at 50 ℃.In order to prepare activated carbon products coated by EC,the coated liquid was uniformly sprayed on the surface of formed activated carbon before heat treatment.The influences of the mass fraction of coated liquid, spray volume and heat treatment temperature on the strength and adsorption properties of coated activated carbon were studied.It was found that under the mass fraction of coated liquid was 4.23%,the weight of activated carbon was 30 g,the spray volume was 20 mL,and the heat treatment temperature was 140 ℃,the strength of the coated activated carbon reached 93.66% and increased 7.35 percentage points compared with that of raw activated carbon and the butane working capacity reached 86.0 g/L and decreased by 9.6 g/L, a thin film with thickness 3-4 μm was formed on the surface of the activated carbon.EC coating did not change the pore structure of activated carbon, but it would affect the wet ability of activated carbon surface, the water contact angle of coated activated carbon was 89.76°, which of the raw activated carbon was 15.41°, and it meant the hydrophobic performance was significantly improved.The surface of the activated carbon products prepared by this method was smooth,no dust,and the shape kept well.%以乙基纤维素(EC)为包覆材料,无水乙醇为溶剂,在50 ℃溶解制成包膜液.将制备好的包膜液均匀地喷涂在成型活性炭的表面,经热处理后,制备得到包覆EC的活性炭产品.考察了包膜液的质量分数、喷涂体积及热处理温度对包覆活性炭强度和吸附性能的影响.结果发现:膜液质量分数4.23%、30 g活性炭喷涂20 mL膜液、热处理温度140 ℃条件下,制备的包覆活性炭产品强度达93.66%,相比原料活性炭提高7.35个百分点,丁烷工作容量为86.0 g/L,相比原料活性炭下降9.6 g/L,在活性炭表面形成了一层3~4 μm的薄膜.EC包覆没有改变活性炭内部的孔结构特征,但会影响活性炭表面的润湿性,经EC包覆后活性炭水接触角(θ)为89.76°(原料活性炭的θ为15.41°),疏水性能显著提高;包覆后的活性炭产品表面光滑平整,无浮尘,形状保持良好.