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论文类型： 期刊论文

发表时间： 2008-11-01

发表刊物： SEPARATION SCIENCE AND TECHNOLOGY

收录刊物： SCIE、EI、Scopus

卷号： 43

期号： 15

页面范围： 3891-3901

ISSN号： 0149-6395

关键字： Electrochemical reduction; polypyrrole; silver; spontaneous reduction

摘要： Polypyrrole (ppy) coatings doped with p-toluene sulfonate sodium on stainless steel mesh (SSM) have been electrosynthesized in aqueous solution. The removal of Ag(+) ions from acidic solutions was investigated through spontaneous reduction (SR) and electrochemical reduction (ER) procedures using reduced composite ppy-SSM. Higher removal efficiencies and current efficiencies were obtained by ER process for ppy-SSM rather than SR process for ppy-SSM and ER process for SSM under comparable conditions. Due to its high efficiency and simplicity, ER was supposed to be an alternative advantageous method for the recovery of low-level silver concentration in industrial wastewater. Cyclic voltammetry was carried out to characterize the electrochemical behavior of ppy-SSM in acid solutions containing Ag(+). Metallic silver deposited on ppy-SSM has been evidenced by scanning electron microscopy (SEM) analysis.