TiO 2/glass film photocatalysts have been prepared by a sol gel method with titanium tetrabutoxide as precursor, and used in photocatalytic degradation of 2,4 dichlorophenol(DCP) in aqueous solution. The experiments i...TiO 2/glass film photocatalysts have been prepared by a sol gel method with titanium tetrabutoxide as precursor, and used in photocatalytic degradation of 2,4 dichlorophenol(DCP) in aqueous solution. The experiments indicated that the TiO 2/glass film coated with five layers of TiO 2 sol in the case of higher pH value(≥10) or lower pH value(≤2) showed a higher catalytic activity, and the relationship between initial DCP concentration( c 0) and reaction rate( r 0) follows Langmuir Hinshelwood equation. The photocatalytic degradation kinetics of DCP( c 0≤0 5 mmol/L) is of first order kinetics.展开更多
以钛酸丁酯和硝酸镧为原料,采用溶胶-凝胶法制备了纯的和La掺杂活性炭负载TiO2催化剂,用XRD、UV-V is漫反射光谱和扫描电镜等测试技术对该催化剂的晶型和形貌进行了表征,并考察了La含量和焙烧温度对TiO2/AC催化剂的性质及光催化分解亚...以钛酸丁酯和硝酸镧为原料,采用溶胶-凝胶法制备了纯的和La掺杂活性炭负载TiO2催化剂,用XRD、UV-V is漫反射光谱和扫描电镜等测试技术对该催化剂的晶型和形貌进行了表征,并考察了La含量和焙烧温度对TiO2/AC催化剂的性质及光催化分解亚甲基蓝活性的影响。结果表明,La掺杂不仅抑制了TiO2由锐钛矿相向金红石相的转变,而且使TiO2的光响应范围向可见光区拓展。当掺杂摩尔分数为0.30%的La,可见光照射120 m in时,La-TiO2/AC催化剂的光催化分解率可达87%。展开更多
利用HCl、NaOH对活化后的粉煤灰进行酸碱浸提,并以改性粉煤灰为载体,采用溶胶-凝胶法制备了粉煤灰负载Cu^(2+)掺杂的TiO_2基复合材料(Cu^(2+)-TiO_2/FCA),然后用其处理煤气化废水,通过测定不同条件下气化废水降解后COD的值,研究了降解...利用HCl、NaOH对活化后的粉煤灰进行酸碱浸提,并以改性粉煤灰为载体,采用溶胶-凝胶法制备了粉煤灰负载Cu^(2+)掺杂的TiO_2基复合材料(Cu^(2+)-TiO_2/FCA),然后用其处理煤气化废水,通过测定不同条件下气化废水降解后COD的值,研究了降解温度、投放量、Cu^(2+)掺杂量对催化剂活性的影响,最后利用XRD、SEM等对光催化剂的形貌和晶型结构进行了表征,研究粉煤灰负载TiO_2基材料的光催化可能机理。结果表明,Cu^(2+)掺杂量为10%的Cu^(2+)-TiO_2/FCA复合材料对于200 m L、COD初始浓度为863.5 mg/L的煤气化废水在温度60℃、投放量4 g时,光催化效果才能达到最佳,COD降解率达到90.1%。展开更多
文摘TiO 2/glass film photocatalysts have been prepared by a sol gel method with titanium tetrabutoxide as precursor, and used in photocatalytic degradation of 2,4 dichlorophenol(DCP) in aqueous solution. The experiments indicated that the TiO 2/glass film coated with five layers of TiO 2 sol in the case of higher pH value(≥10) or lower pH value(≤2) showed a higher catalytic activity, and the relationship between initial DCP concentration( c 0) and reaction rate( r 0) follows Langmuir Hinshelwood equation. The photocatalytic degradation kinetics of DCP( c 0≤0 5 mmol/L) is of first order kinetics.
文摘以钛酸丁酯和硝酸镧为原料,采用溶胶-凝胶法制备了纯的和La掺杂活性炭负载TiO2催化剂,用XRD、UV-V is漫反射光谱和扫描电镜等测试技术对该催化剂的晶型和形貌进行了表征,并考察了La含量和焙烧温度对TiO2/AC催化剂的性质及光催化分解亚甲基蓝活性的影响。结果表明,La掺杂不仅抑制了TiO2由锐钛矿相向金红石相的转变,而且使TiO2的光响应范围向可见光区拓展。当掺杂摩尔分数为0.30%的La,可见光照射120 m in时,La-TiO2/AC催化剂的光催化分解率可达87%。
文摘利用HCl、NaOH对活化后的粉煤灰进行酸碱浸提,并以改性粉煤灰为载体,采用溶胶-凝胶法制备了粉煤灰负载Cu^(2+)掺杂的TiO_2基复合材料(Cu^(2+)-TiO_2/FCA),然后用其处理煤气化废水,通过测定不同条件下气化废水降解后COD的值,研究了降解温度、投放量、Cu^(2+)掺杂量对催化剂活性的影响,最后利用XRD、SEM等对光催化剂的形貌和晶型结构进行了表征,研究粉煤灰负载TiO_2基材料的光催化可能机理。结果表明,Cu^(2+)掺杂量为10%的Cu^(2+)-TiO_2/FCA复合材料对于200 m L、COD初始浓度为863.5 mg/L的煤气化废水在温度60℃、投放量4 g时,光催化效果才能达到最佳,COD降解率达到90.1%。
