Good practices for reporting the photocatalytic evaluation of a visible-light active semiconductor: Bi 2 O 3 , a case study
Por:
Hernandez-Gordillo, Agileo, Bizarro, Monserrat, Gadhi, Tanveer A., Martinez, Ana, Tagliaferro, Alberto, Rodil, Sandra E.
Publicada:
1 ene 2019
Categoría:
Catalysis
Resumen:
In this paper, we discuss the importance of distinguishing the contributions of photolysis, adsorption, sensitization, degradation and mineralization processes to the photocatalytic activity of a visible-light active semiconductor: Bi 2 O 3 . Based on this case study, we propose a follow-up work plan to obtain the relevant information and achieve proper interpretation of reported data to adequately infer the photocatalytic activity of the Bi 2 O 3 material. To do so, we compared the changes in the theoretical and experimental absorbance spectra of three different dyes during the photodegradation process: rhodamine-B (RhB), acid blue 113 (AB) and indigo carmine (IC). Photocatalytic degradation of these dyes using the same semiconductor material (Bi 2 O 3 ) was performed using the standard spectrocolorimetric method while taking care to appropriately consider the competing processes mentioned above. Furthermore, the degree of mineralization achieved due to the photocatalytic degradation of the dyes was obtained using the total organic carbon (TOC) analysis. The commonly used evaluation of the results suggests that a certain degree of photodegradation and mineralization was achieved. However, careful analysis indicates that this was mainly due to a decrease in the relative concentration of the dye molecules in the solution because of their adsorption on the surface of the semiconductor and not to complete degradation. © 2019 The Royal Society of Chemistry.
Filiaciones:
Hernandez-Gordillo, Agileo:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México Circuito Exterior SN, Ciudad Universitaria, CP 04510, Coyoacán Cd. De México, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuit Exterior SN,Ciudad Univ, Cd De Mexico 04510, Mexico
Bizarro, Monserrat:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México Circuito Exterior SN, Ciudad Universitaria, CP 04510, Coyoacán Cd. De México, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuit Exterior SN,Ciudad Univ, Cd De Mexico 04510, Mexico
Gadhi, Tanveer A.:
U.S. Pakistan Center for Advanced Studies in Water (USPCASW), Mehran, University of Engineering and Technology, Jamshoro, 76062, Pakistan
Univ Engn & Technol, USPCASW, Jamshoro 76062, Pakistan
Martinez, Ana:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México Circuito Exterior SN, Ciudad Universitaria, CP 04510, Coyoacán Cd. De México, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuit Exterior SN,Ciudad Univ, Cd De Mexico 04510, Mexico
Tagliaferro, Alberto:
Department of Applied Science and Technology, Politecnico di Torino, Italy
UOIT, Canada
Politecn Torino, Dept Appl Sci & Technol, Turin, Italy
UOIT, Oshawa, ON, Canada
Rodil, Sandra E.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México Circuito Exterior SN, Ciudad Universitaria, CP 04510, Coyoacán Cd. De México, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuit Exterior SN,Ciudad Univ, Cd De Mexico 04510, Mexico
|