富含表面羟基的活性炭制备及其在电催化氧化垃圾渗滤液中的应用

Preparation of an activated carbon rich in surface hydroxyl and its application in the electrocatalytic oxidation of landfill leachate

为探究表面羟基对铁碳三维粒子电极电催化氧化性能的影响,采用5 g活性炭中KMnO_(4)用量15 g、用20 mL质量分数10%的H_(2) SO_(4)酸化、反应温度35℃、反应时间1 h的方法对市售活性炭进行氧化改性,并进行结构表征,发现改性活性炭相较于原始活性炭表面羟基量大大增加。然后将改性前后的活性炭制备成铁碳三维粒子电极,用于电催化氧化垃圾渗滤液。结果表明,在100 mL垃圾渗滤液中加入3 g电极、电催化氧化的反应温度50℃、电解电压8 V、O_(3)流量0.2 L/min、电磁搅拌转速600 r/min的条件下,反应30 min,改性活性炭制备的铁碳三维粒子电极比未改性活性炭制备的电极对垃圾渗滤液的总有机碳、氨氮降解率分别提升了26、20百分点。

To investigate the effect of surface hydroxyl on the electrocatalytic oxidation performance of iron-carbon three-dimensional particle electrodes,oxidation modification conditions for commercial activated carbon was set as:in 5 g activated carbon,KMnO_(4) addtion of 15 g,20 mL H_(2) SO_(4) mass percentage of 10%,reaction temperature of 35℃and reaction time of 1 h.Characterization analysis showed that the surface hydroxyl content of modified activated carbon increased greatly.Then,iron-carbon three-dimensional particle electrodes with modified or unmodified activated carbon were prepared,and applied in electrocatalytic oxidation of landfill leachate.Results showed that at reaction temperature of 50℃,electrolysis voltage of 8 V,O_(3) volume velocity of 0.2 L/min,and electromagnetic stirring speed of 600 r/min when 3 g electrode was added in 100 mL landfill leachate,the electrode prepared with modified activated carbon improve the TOC and ammonia nitrogen degradation rates by 26 and 20 perentage points,respectively,after 30 minutes reaction.