管状结构TiO_(2)@生物炭复合材料的制备及光催化降解染料废水性能研究

Preparation of Tubular TiO_(2)@Biochar Composite and Its Photocatalytic Degradation of Dye Wastewater

以芹菜茎、钛酸四丁酯为主要原料,利用浸渍-煅烧两步法成功制备出管状结构TiO_(2)@生物炭复合材料。SEM图片显示复合材料保持了芹菜茎的褶皱管状结构;EDS、FT-IR、XRD、XPS结果表明复合材料由C、O、Ti三种元素组成;BET结果表明复合材料具有介孔结构,平均孔径约为12.53 nm;UV-Vis结果显示复合材料在可见光区具有较强吸收。光催化降解实验结果表明,TiO_(2)@生物碳复合材料具有较好的光催化性能,且含碳量对于染料的吸附及光催化效率有较大影响。动力学分析表明,TiO_(2)@生物碳复合材料对亚甲基蓝染料废水的降解反应符合伪一级动力学模型。

The tubular TiO_(2)@biochar composites were successfully prepared with celery stem and tetrabutyl titanate as the main raw materials by two-step impregnation calcination method.SEM images showed that the composite material maintained the folded tubular structure of celery stem.The results ofEDS,FT-IR,XRD and XPS showed that the composites were composed ofC,O and Ti BET results showed that the composites had mesoporous structure with average pore size of 12.53 nm.UV-Vis results showed that the composites had strong absorption in the visible light region.The experimental results of photocatalytic degradation showed that TiO_(2)@biocarbon composite had good photocatalytic performance,and the carbon content had a great influence on the dye adsorption and photocatalytic efficiency.The kinetic analysis showed that the degradation reaction of TiO_(2)@biocarbon composite to methylene blue dye wastewater conformed to the pseudo first order kinetic model.