scholarly journals Visible-light Responsive Cu-MOF-NH 2 for Highly Efficient Aerobic Photocatalytic Oxidation of Benzyl Alcohol

2021 ◽  
Author(s):  
Samira Abdel-Azim ◽  
Delvin Aman ◽  
eric van steen ◽  
Howaida Abd El Salam
Keyword(s):  
Visible Light ◽  
Benzyl Alcohol ◽  
Photocatalytic Oxidation ◽  
Order Kinetic ◽  
Electron Hole ◽  
Oxidation Of Benzyl Alcohol ◽  
Order Kinetic Model ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
Alcohol Conversion

Abstract The current study focuses on the photocatalytic oxidation of benzyl alcohol in acetonitrile under air bubbling conditions comparing titania-based materials, Cu-MOF, and Cu-MOF-NH2 as semiconductor photocatalysts. The catalysts were characterized by XRD, N2 adsorption-desorption, FT-IR, Raman spectroscopy, and TEM. The photocatalytic benzyl alcohol conversion reached ~ 100% after exposing the four prepared catalysts to a 125W mercury lamp for up to 240 min. Benzaldehyde is formed with a moderate selectivity (after a reaction time of 60 min. ca. 30% over the titania-based catalysts 37%, 45% over Cu-MOF, and Cu-MOF-NH2, respectively). The formation of electron-hole pairs at the surface of the semiconductor nanoparticles followed by oxidation reaction was the suggested mechanism. A first-order kinetic model was observed for the photocatalytic oxidation of the investigated alcohols, and the rate constants were calculated. According to preliminary research, decorating MOF linker by amine (MOF-NH2) could improve visible-light harvesting, charge separation, and electron transport of the resulting catalyst, resulting in increased photocatalytic activity. The current work offers some direction for the development of MOF-based photocatalysts for organic synthesis.

Effect of Surface Treatment on the Selective Photocatalytic Oxidation of Benzyl Alcohol into Benzaldehyde by O2 on TiO2 Under Visible Light

2010 ◽  
Vol 53 (7-10) ◽  
pp. 578-583 ◽  
Author(s):  
Shinya Higashimoto ◽  
Kohei Okada ◽  
Tomoki Morisugi ◽  
Masashi Azuma ◽  
Hiroyoshi Ohue ◽  
...  
Keyword(s):  
Visible Light ◽  
Surface Treatment ◽  
Benzyl Alcohol ◽  
Photocatalytic Oxidation ◽  
Oxidation Of Benzyl Alcohol ◽  
Effect Of Surface

scholarly journals Polymeric Substitution of Triazole Moieties in Cellulosic Schiff Base for Heavy Metal Complexation Studies

2021 ◽  
Author(s):  
R MAHALAKSHMI ◽  
SARAVANAN R ◽  
P SELVAKUMAR ◽  
M S KARTHIKEYAN ◽  
L RAVIKUMAR
Keyword(s):  
Schiff Base ◽  
Metal Ion ◽  
Equilibrium Concentration ◽  
Sorption Process ◽  
Complexation Reaction ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Adsorption Desorption

Abstract The adsorption of metal ions from wastewater using Schiff base cellulose bearing pendulant heterocyclic chelating groups (MC-Tz) as a sorbent is the subject of this paper. Solid state 13 C-NMR, FT-IR, SEM, and XRD spectroscopy, as well as TGA and XRD were utilized to examine the adsorbent. The batch sorption process used pH, adsorbent dose, initial adsorbate concentration, temperature, as well as contact time to calculate the metal ion levels. The optimum pH-6.0, with the complexation reaction and ion exchange phase as the mechanisms at work. To investigate the equilibrium concentration and temperature-dependent rate constants, various models, such as the Langmuir, Freundlich, Temkin, and Redlich-Peterson adsorption isotherm were utilized. A Kinetic study shows that the Langmuir is more in agreement with the Pseudo-second order Kinetic model. Adsorption-Desorption experiments over four cycles demonstrated the feasibility of the sorbent's regeneration potential and the measured values of enthalpy and entropy explain the essence of the adsorption process. The objective of this research is to discover non-toxic, environmentally friendly adsorbent biodegradable components and to conduct evaluations to determine their use in wastewater treatment.

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