NaTa03/MCM-48 composites for photocatalytic conversion of organic molecules

[摘要] The synthesis, characterization, and photocatalytic activity of a series of NaTaO3/MCM-48 composite photocatalysts prepared by sol-gel method is reported. The composite catalysts were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and N2adsorption-desorption porosimetry. Their photocatalytic activity for conversion of organic molecules was tested using p-nitroaniline as a model pollutant. The surface area was found to be in the order of 235-964 m2/g and 35-407 m2/g for photocatalysts calcined at 500 °C and 850 °C, respectively. The surface area was found to depend on the MCM silica content. The pore size for samples calcined at 500 °C ranges from 2.6-3.2 nm, and becomes significantly larger at 850 °C (12.6-30.0 nm) for most composites. All composites have been found to be photocatalytically active towardsp-nitroaniline conversion intop-phenylenediamine under uv- visible irradiation. The conversion of p-nitroaniline per weight of NaTaO3in the composite photocatalysts is found to be higher than that of pristine NaTaO3. The composites lose 12% of their original activity after three consecutive catalytic cycles.

[发布机构] Center for Energy Environment and Sustainability, Wake Forest University, Winston-Salem; NC; 27109, United States^1;Department of Chemestry, 1530, S. martin Luther King Jr. Blvd, Tallahassee; FL; 32307, United States^2;Joint School of Nanoscience and Nanoengineering, North Carolina Agricultural and Technical State University, University of North Carolina at Greensboro, Greensboro; NC; 27401, United States^3;Department of Physics, Wake Forest University, Winston-Salem; NC; 27109, United States^4;Department of Chemistry, Wake Forest University, Winston-Salem; NC; 27109, United States^5

[效力级别] 能源学 [学科分类] 材料科学（综合）

[关键词] Catalytic cycles;Composite catalysts;Composite photocatalysts;Organic molecules;Phenylenediamines;Photo-catalytic;Photocatalytic activities;Powder X ray diffraction