陶瓷负载型MnO_(2)-CeO_(2)-La_(2)O_(3)臭氧催化过滤膜的制备及表征

Preparation and characterization of MnO_(2)-CeO_(2)-La_(2)O_(3)ozone catalytic ceramic filtration membranes

以陶瓷膜为载体,采用浸渍-焙烧法制备了MnO_(2)-CeO_(2)-La_(2)O_(3)臭氧催化过滤膜,使用SEM、EDS和XRD等分析方法对其形貌和结构进行了表征分析。以电镀园区预处理混合废水为处理对象,考察了所制备的催化过滤膜在同步臭氧催化氧化和膜过滤作用下的催化活性。结果表明,在浸渍液中Ce^(3+)、La^(3+)、Mn^(2+)的质量比为2:2:1、焙烧时间为3 h和焙烧温度为800℃下制备出的催化过滤膜对电镀园区废水有较好的催化性能。在臭氧投加量为5 mg·L^(-1),跨膜压差为0.15 MPa,回流比为90%的条件下,废水COD的去除率可达到51.2%,与未负载催化剂的陶瓷膜相比,COD去除率提高了23.8%,稳定性实验测试结果表明,以上制备的催化过滤膜具有良好的稳定性能。以上研究结果可实现膜分离技术与催化臭氧氧化技术的耦合,提高出水水质,增强催化过滤膜的抗污染能力。

MnO_(2)-CeO_(2)-La_(2)O_(3)ozone catalytic ceramic filtration membranes were prepared by impregnationcalcination method using ceramic membranes as carriers,and the morphology and structure were characterized by SEM,EDS and XRD.The catalytic activity of the membranes prepared in this work was explored under the synchronous processes of catalytic ozonation and membrane filtration when the pretreatment mixed wastewater from an electroplating park was taken as the treating object.The results indicated that the catalytic filter membranes prepared at the mass ratio of 2:2:1 for Ce^(3+),La^(3+)and Mn^(2+)in the impregnation solution,calcination time of 3 h and 800°C had a good catalytic performance.At the ozone dosage of 5 mg·L^(-1),transmembrane pressure of 0.15 MPa,and reflux ratio of 90%,the COD removal rate of wastewater could reach 51.2%,it increased by 23.8%compared with the ceramic membranes without loading catalysts.In addition,the stability tests demonstrated that the ozone catalytic ceramic filtration membranes had a good stability.Above all,the coupling of the membrane separation technology and catalytic ozonation was realized,and the effluent water quality was improved,and the anti-pollution ability of the catalytic filtration membranes were enhanced.