钯修饰碳纳米管电极电催化氧化三氯生
Electrocatalytic oxidation of triclosan on Pd modified carbon nanotubes electrode
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摘要: 采用钯修饰多壁碳纳米管（MWCNTs）电极电催化氧化降解三氯生，考察了极板间距、电流密度、离子强度、pH、初始浓度和电解时间对三氯生去除效率的影响，并探讨了其反应动力学。结果表明：钯修饰多壁碳纳米管（MWCNTs）电极电催化氧化降解三氯生的最佳条件为：三氯生初始浓度为50 mg/L，电流密度约为10 mA/cm2，极板间距为1 cm，pH为11，电解质Na2SO4浓度为1 000 mg/L。此条件下，反应时间为3 h时三氯生的去除率可达到99%以上，三氯生的降解为零级反应。Abstract: Palladium modified-multi-walled carbon nanotubes (MWCNTs) electrode was used in the the electrocatalytic oxidation of triclosan. The experiments were carried out to investigate the effects of plate distance， current density， ionic strength， pH， initial concentration， and electrolysis time on removal efficiency and reaction kinetics. Experimental results indicated that the optimum degradation conditions are the initial triclosan concentration of 50 mg/L， current density of 10 mA/cm2， plate distance of 1 cm， pH of 11 and Na2SO4 concentration of 1 000 mg/L. Under such conditions， the removal efficiency of triclosan is over 99% when reaction time is 3 h and triclosan degradation basically accords with the zero order kinetics.
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