膨胀石墨基炭/炭复合电极的制备及含酚废水的降解

Preparation of expanded graphite-based carbon/carbon composite electrode and its degradation of phenol

以压缩膨胀石墨为基体、蔗糖为炭源、磷酸为活化剂,经碳化、活化压片制得膨胀石墨基炭/炭复合电极(EGC电极)。采用低温液氮吸附法和扫描电镜(SEM)进行表征,研究了蔗糖浓度对电极表面结构和孔道特征的影响规律,并以苯酚为处理目标物,考察了不同的电解条件。结果表明,EGC电极以膨胀石墨为骨架,包覆炭膜,孔径主要分布在0.5～2.5nm之间,蔗糖浓度为50%制备的EGC电极比表面积最高,电化学氧化苯酚效果最优。电解苯酚试验中,降低苯酚初始浓度、增加电流密度和电解质浓度有利于提高苯酚的降解效率。

Expanded graphite-based carbon/carbon composite electrode（EGC electrode） had been made of compressed expanded graphite impregnated by sucrose-phosphoric acid solution.The microstructure of the composite electrode had been investigated by nitrogen adsorption method and SEM.The influence of initial sucrose concentration on the surface structure and porous characteristics had been investigated,as well as the impact of electrolytic conditions on phenol degradation.The results indicate that the EGC electrode is comprised of a graphite backbone coated by a thin layer of activated carbon.The pore width distribution is among 0.5-2.5 nm.The EGC electrode could obtain the highest surface areas as the sucrose concentration reaches 50%,and it performs highly effectively in electrochemical oxidation of phenol.The data shows that the removal efficiency of phenol increases with lowering the initial phenol concentration and increasing the current density and electrolyte concentration.