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

3rd Euro-Mediterranean Conference on Materials and Renewable Energies

材料科学;能源学

Senevirathne, K.^1,2 ; Xia, C.-K.^1 ; Adhikari, S.P.^1,5 ; Zhang, L.^3 ; Williams, R.T.^1,4 ; Lachgar, A.^1,5

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

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

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/758/1/012003/pdf
DOI  :  10.1088/1742-6596/758/1/012003

学科分类：材料科学（综合）

来源: IOP

【 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.