Na2CO3/TiO2催化剂的制备及催化性能研究

以钛酸正四丁酯为钛源,采用水热法制备出纯TiO2及Na2CO3修饰的TiO2催化剂样品。以亚甲基蓝溶液模拟染料废水为目标污染物,考察纯TiO2和经Na2CO3修饰后的Na2CO3/TiO2催化剂的催化性能。采用XRD、TEM、BET等方法对催化剂的结构和形貌进行了表征。结果表明,制备出的经Na2CO3修饰后的TiO2催化剂相较于纯TiO2,晶粒尺寸减小,比表面积增大,使得目标污染物分子在材料表面更加容易接触吸附,催化效果明显提高。当催化剂投加量为50 mg、pH为10、亚甲基蓝的质量浓度为20 mg/L时,催化剂催化效果最大。在紫外光照射条件下,15 min时,Na2CO3的浓度0.15的Na2CO3/TiO2对亚甲基蓝的去除率达到97.0%。

Study on Preparation and Catalytic Performance of Na2CO3/TiO2 Catalysts

The pure TiO2 and Na2CO3 modified TiO2 catalyst samples were prepared by hydrothermal method using tetrabutyl titanate as the titanium source.The catalytic properties of pure TiO2 and Na2CO3 modified Na2CO3/TiO2 were investigated by using methylene blue solution to simulate dye wastewater as the target pollutant.The structure and morphology of the catalyst were characterized by XRD,TEM and BET.The results showed that the prepared TiO2 catalyst modified by Na2CO3 had smaller grain size and larger specific surface area than pure TiO2,which made the target pollutant molecules more easily contacted and adsorbed on the surface of the material,and the catalytic effect was obviously improved.When the catalyst dosage was 50 mg,the p H was 10,and the mass concentration of methylene blue was 20 mg/L,the catalyst had the greatest catalytic effect.Under the condition of ultraviolet light irradiation,the removal rate of methylene blue by Na2CO3/TiO2 with the concentration of 0.15 reached 97.00%at 15 min.