纳米MnO2/PVA石墨纸多层电极电催化降解聚丙烯酰胺  

Electrocatalytic degradation of polyacrylamide by nanometer MnO2/PVA graphite paper multilayer electrode

作　　者：胡月 汪明旺 吕宏凌[1] 刘祎 陈金庆 HU Yue;WANG Mingwang;LÜHongling;LIU Yi;CHEN Jinqing(Department of Chemical Engineering,China University of Petroleum,Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)化学工程学院

出　　处：《化工进展》2020年第2期643-648,共6页Chemical Industry and Engineering Progress

基　　金：国家科技重大专项二期（2011ZX05011）;中央高校基本科研业务费专项资金（27R1204004A）

摘　　要：采用涂覆法制备纳米MnO2-PVA/GP多层复合电极,经FTIR、SEM、循环伏安特性曲线分别表征电极的分子结构、表面形貌和电化学性能。复合电极表面聚乙烯醇(PVA)涂层光滑,PVA薄层均匀内嵌γ晶型球形纳米MnO2颗粒,粒径约15~20nm,具有较高催化活性。该电极为多层复合结构,以石墨纸为基底电极,集合PVA强吸附性和纳米MnO2催化活性,应用于电催化降解石油三采过程中产生的高黏性的聚丙烯酰胺溶液。考察了电流密度、溶液pH、电解质浓度等因素对复合电极电催化降黏性能的影响。该电极电催化降黏性能优于石墨纸电极和纳米MnO2催化,在pH=7、电解质Na2SO4溶液浓度为0.3mol/L、电流密度10mA/cm2、电催化2.0h后PAM溶液的黏度下降90.2%以上,达到石油三采中聚丙烯酰胺废水回用的黏度要求,同时节约了采油业用水资源。Nanometer MnO2-PVA/GP composite electrodes were prepared by a simple coating method using the soluble polyvinyl alcohol and nano-MnO2 catalyst.The morphology,composition and electrochemical properties on the electrode surfaces were analyzed by FTIR,SEM and cyclic voltammetry(CV).The composite electrodes were fully covered with a smooth PVA surface layer where MnO2 nanoparticles were tightly embed.The nano-MnO2 particles were sphericalγ-type crystals with the mean diameter of 15—20nm and thus high electrocatalytic activity.The composite electrodes presented a multilayer structures containing graphite paper as substrate electrode,PVA adsorption layer and nano-MnO2 catalytic region,and had been applied for electrochemically degrading high viscosity polyacrylamide(PAM)solution from EOR(enhanced oil recovery)process.The influences of solution pH,current density and electrolyte concentrations were investigated on the electrocatalytic PAM degradation.The results showed that the degradation performances of PAM using the composite electrodes were better than those of graphite electrode and nano-MnO2 catalysis.The viscosity reduction of PAM solution were optimally achieved up to 90.2%using the composite electrodes within 2.0h under current density of 10mA/cm2,pH=7.0,0.3mol/L sodium sulfate solution.The novel multifunctional electrodes had encouraged suitable alternatives to apply electrocatalysis for reducing viscosity and recycling polyacrylamide wastewater with the water resource conservations in oil production technology.

关 键 词：纳米粒子 电化学 催化(作用) 电流密度 聚丙烯酰胺 降低黏度 

分 类 号：X703.1[环境科学与工程—环境工程] X705