Indian Institute of Technology Ropar

About: Indian Institute of Technology Ropar is a education organization based out in Ropar, India. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 1014 authors who have published 2878 publications receiving 35715 citations.

Mesoporous nitrogen containing carbon materials for the simultaneous detection of ascorbic acid, dopamine and uric acid

Abstract: Mesoporous nitrogen rich carbonaceous (MNC) materials have been synthesized by pyrolyzing the polymerized ethylenediamine nanocasted into a SBA-15 hard template at 600 and 800 °C and explored for simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The electrocatalytic activity of these materials for the oxidation of analyte molecules was examined by means of redox-competition mode of scanning electrochemical microscopy (SECM), voltammetric, chronoamperometric and rotating disc electrode (RDE) measurements. MNC material exhibits a superior sensitivity towards the oxidation of AA, DA, and UA with a lowest detection limit of 0.01 μM, 0.001 μM and 0.01 μM respectively without any substantial interferences including glucose at physiologically relevant concentrations.

Thermal catalysis vs. photocatalysis: A case study with FeVO4/g-C3N4 nanocomposites for the efficient activation of aromatic and benzylic C-H bonds to oxygenated products

Abstract: Three semiconductor metal vanadates FeVO 4 , BiVO 4 , and LaVO 4 were synthesized. To improve the thermal catalytic and photocatalytic activity of highly efficient metal vanadate FeVO 4 , nanocomposites of FeVO 4 and graphitic C 3 N 4 were prepared. Nanocomposites were prepared via thermal annealing method by varying the composition of FeVO 4 and g-C 3 N 4 . Catalysts were characterized by a series of complementary combination of powder X-ray diffraction, thermogravimetric analysis, N 2 adsorption-desorption, scanning/transmission electron microscopy, energy dispersive X-ray analysis, Fourier transform infrared spectroscopy, diffuse reflectance ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy, photoluminescence, and photoelectrochemical techniques. Catalysts were investigated in the liquid phase oxidation of benzene, phenol, hydroquinone, naphthalene, anthracene, toluene, ethyl benzene, di-phenyl methane, and p -xylene under conventional thermal condition and visible light irradiation condition. Kinetic and thermodynamic parameters (such as k, E a , ΔH, ΔG, and ΔS) were calculated for the benzene hydroxylation by varying the reaction parameters under thermal catalytic condition. In order to confirm the active species responsible for the thermal catalytic and photocatalytic processes, UV–vis, fluorescence, cyclic voltammetry, and radical scavenging experiments were carried out with the help of suitable probe molecules. Based on the results obtained, reaction mechanism was proposed, and the structure-activity relationship was established. The catalyst was magnetically separated and recycled with negligible loss in the activity which is important for the sustainable heterogeneous catalysis. The developed catalytic process has the potential for the sustainable synthesis of a wide range of industrially important fine chemicals. Such a unique and detailed investigation of comparative study between thermal catalysis and photocatalysis using FeVO 4 /g-C 3 N 4 nanocomposite will be highly useful to design optimum catalyst for an appointed catalytic reaction.