石墨烯泡沫包裹铁电极的制备及其在电解脱色染料中的应用研究

Preparation of graphene sponge coated iron electrode and its applications in the electrolytic decoloration of dye effluents

通过水热还原氧化石墨烯在铁电极表面原位生长石墨烯泡沫的方法制得了石墨烯泡沫包裹铁电极(GS-Fe电极),并将其应用于多种染料的电解脱色。结果表明:在相同电流密度下,GS-Fe电极的电解反应速率常数是铁电极的5倍;加入电解质对电解效率至关重要,其中NaCl是最有效的电解质;对甲烯蓝而言,最佳的电解条件为甲烯蓝初始质量浓度30mg/L、pH 5~7;GS-Fe电极可用于电解脱色刚果红、酸性蓝92和活性蓝R。电解脱色的机制推测主要为间接氧化,Cl^-被氧化成ClO^-,而后ClO^-氧化染料。GS-Fe电极可通过简单清洗再生,电解的脱色率几乎不受影响。

By hydrothermal reduction of graphene oxide,graphene sponge was in situ coated on the surface of Fe electrode to obtain GS coated Fe electrode（GS-Fe electrode）,which was used in the electrolytic decoloration of various dyes.The data indicated that：the decoloration kinetics constant of GS-Fe electrode was five times of that of Fe electrode at the same current density.The presence of electrolyte was crucial for the electrolysis,among which NaCl was the most effective one.The optimal electrolysis conditions were at methylene blue（MB）concentration of 30 mg/L and pH 5-7.GS-Fe electrode could also be applied in the electrolytic decoloration of congo red,acidic blue 92 and remazol brilliant blue R.The possible electrolytic decoloration mechanism was speculated as indirect oxidation,where Clwas oxidized into ClO-for the oxidation of dyes.GS-Fe electrode could be regenerated by simple washing and the decoloration efficiency was not influenced.