载铜二氧化硅微球在苯酚氧化降解中的催化性能

Catalytic performance of copper-loaded silica microspheres inphenol oxidation

工业生活中苯酚及其衍生物废水的排放已经对水资源造成了严重的污染。为解决问题,以实验室自制的SiO_(2)粒子作为催化剂载体,负载活性中心Cu(Ⅱ),通过浸渍、煅烧等处理手段分别制备了SiO_(2)-Cu^(2+)和SiO_(2)-CuO催化剂,并将其应用于苯酚的CWPO中。以苯酚在水溶液中被降解后的苯酚转化率和样品COD去除率作为依据,系统地研究了反应温度、反应时间、氧化剂浓度、催化剂浓度以及介质初始pH值等反应条件对两种催化剂催化性能的影响。实验结果表明,SiO_(2)-Cu^(2+)和SiO_(2)-CuO催化剂均在较宽的pH值范围内表现了优异的催化活性,在苯酚浓度1.0g/L,催化剂浓度0.23g/L,反应温度70℃,反应时间20h,过氧化氢浓度5.0g/L的条件下,可达到100%的苯酚转化率和约90%的COD去除率。

The discharge of wastewater containing phenol and its derivatives causes serious pollution to water resources.In order to solve the problem,SiO_(2)-Cu^(2+) and SiO_(2)-CuO catalysts were prepared by impregnation,calcination and other treatment methods,using the laboratory-made SiO_(2) particles as the catalyst carrier to support the active center Cu(Ⅱ).And the prepared catalysts were applied to the CWPO of phenol.Based on the conversion of phenol after degraded in aqueous solution and the COD removal rate of the sample,the effects of reaction conditions such as reaction temperature,reaction time,oxidant concentration,catalyst concentration and initial pH value of the medium on the catalytic performance of the two catalysts were systematically studied.The experimental results show that the SiO_(2)-Cu^(2+) and SiO_(2)-CuO catalysts have excellent catalytic activity in a wide pH range,and the 100%phenol conversion rate and about 90%COD removal rate can be achieved under the conditions of phenol concentration of 1.0 g/L,catalyst concentration of 0.23 g/L,reaction temperature of 70℃,reaction time of 20 h,and hydrogen peroxide concentration of 5.0 g/L.