制备工艺对活性炭电极电吸附性能的影响

Influence of Preparation Technology to Electrosorptive Deionization on Activated Carbon Electrode

用活性炭、酚醛树脂和乌洛托品制备了活性炭电极。研究了电极制备过程中黏结剂添加量、活性炭用量以及成型后活性炭的炭化温度和炭化时间对电吸附除盐性能的影响,并利用扫描电子显微镜(SEM)分析了电极的表面形貌。结果表明:当活性炭、酚醛树脂和乌洛托品混合比例为8:1.8:0.2时,电极能够成型,随着黏结剂的比例增加,电极的除盐率降低;随着活性炭用量的增加,吸附平衡的时间增加,除盐率提高,但平衡吸附量降低,当NaCl浓度降低到一定程度时,再增加活性炭用量去除率变化变小,试验选定的活性炭用量为0.45g/片电极;随着炭化温度的升高和炭化时间的增长,活性炭电极电吸附除盐效果明显提高,850℃下炭化2h的电极炭化完全,除盐率是未炭化的电极除盐率的2.08倍。

Activated carbon electrode was prepared with activated carbon,phenolic resin and methenamineare. Influence of the mass of activated carbon,proportion of adhesive,temperature and time of carbonizing were studied. Scan electron microscope（SEM）was used to analyze surface appearance of electrodes. Results indicated that electrode can be molded when proportion of activated carbon,phenolic resin and methenamineare was 8∶1.8∶0.2 and the desalination rate decreased as the increasing content of binders. Time of adsorption equilibrium and desalination rate were increased,equilibrium adsorption capacity was reduced by raising the mass of activated carbon. When NaCl concentration reached to a certain degree,the change of desalination rate was decreased,with mass of activated carbon of 0.45g per electrode. The higher temperature and longer time,the higher desalination rate was,and it can be carbonized thoroughly at 850℃ for 2h,desalination rate of which was 2.08times than that of uncarbonized.