化学还原氧化石墨烯修饰PbO_(2)电极及催化降解酸性红G  

Chemically reduced graphene oxide modified PbO_(2) electrodes and the degradation of acidic red G

作　　者：路思佳 郑兴[1] 李晓良 LU Si-jia;ZHENG Xing;LI Xiao-liang(State Key Laboratory of Eco-Hydraulic in Northwest Arid Region,Xi’an University of Technology,Xi′an 710048,China)

机构地区：[1]西安理工大学,西北旱区生态水利国家重点实验室,陕西西安710048

出　　处：《中国环境科学》2021年第8期3635-3641,共7页China Environmental Science

基　　金：陕西省教育厅重点实验室科研计划项目(19JS049);中国博士后科学基金资助项目(2020M683688XB)。

摘　　要：为了提高Ti/PbO_(2)电极的稳定性与催化氧化能力,将化学还原氧化石墨烯(RGO)以共沉积的方法修饰于β-PbO_(2)层.通过扫描电镜(SEM),X射线衍射仪(XRD),循环伏安法(CV),电化学交流阻抗(EIS),产羟基自由基(·OH)能力,强化寿命等测试方法对电极性能进行表征,并以酸性红G(ARG)为目标降解物,评估PbO_(2)-RGO电极的催化效果.结果表明,电极经RGO改性后晶型仍为β-PbO_(2),析氧过电位由1.60V升至1.83V,膜阻抗由144Ω/cm^(2)降至16.2Ω/cm^(2),强化寿命提升了43.6%.通过ARG降解实验表明,改性后的PbO_(2)-RGO电极催化性能均有所提高,其中PbO_(2)-RGO(0.05)电极具有最优的催化能力,120min内对ARG的脱色率可达到98.5%,同时对COD的去除率可达76.89%.It is important to improve the stability and catalytic capacity of Ti/PbO_(2) electrode for long term running of electrochemical process.In the present work chemically reduced graphene oxide(RGO)was included intoβ-PbO_(2) layer by using codeposition method to improve the performance of the electrode.The modified electrode was characterized by using scanning electron microscopy(SEM),X-ray diffractometry(XRD),cyclic voltammetry(CV)and electrochemical alternating impedance(EIS).Its capacity in producing hydroxyl radical(·OH)and lifetime was also checked.The catalytic effect of the PbO_(2)-RGO electrode was evaluated using acidic red G(ARG)as the target degradant.The results showed that the modified PbO_(2)-RGO electrode wasβ-PbO_(2) in nature.After modification the oxygenation overpotential increased from 1.60 V to 1.83 V,While the membrane impedance decreased from 144Ω/cm^(2) to 16.2Ω/cm^(2) with an increment of lifespan by 43.6%.The ARG degradation experiments demonstrated significant improvement on catalytic performance after electrode modification.Under optimized condition PbO_(2)-RGO(0.05)electrode achieved decolorization of ARG for 98.5%and COD removal of 76.89%within 120 min.

关 键 词：化学还原氧化石墨烯 掺杂 Ti/PbO_(2)电极 电催化降解 酸性红G 

分 类 号：X703.2[环境科学与工程—环境工程]