Nano Pt/TiO2 photocatalyst for ultrafast production of sulfamic acid derivatives using 4-nitroacetanilides as nitrogen precursor in continuous flow reactors

Abstract

The design of reactors based on high performance photocatalysts is an important research in catalytic hydrogenation. In this work, modification of titanium dioxide nanoparticles (TiO2 NPs) was achieved by preparation of Pt/TiO2 nanocomposites (NCs) through photo-deposition method. Both nanocatalysts were used for the photocatalytic removal of SOx from the flue gas at room temperature in the presence of hydrogen peroxide, water, and nitroacetanilide derivatives under visible light irradiation. In this approach, chemical deSOx was achieved along with protection of the nanocatalyst from sulfur poising through the interaction of the released SOx from SOx-Pt/TiO2 surface with p-nitroacetanilide derivatives to produce simultaneous aromatic sulfonic acids. Pt/TiO2 NCs have a bandgap of 2.64 eV in visible light range, which is lower than the bandgap of TiO2 NPs, whereas TiO2 NPs have a mean size of 4 nm and a high specific surface area of 226 m2/g. Pt/TiO2 NCs showed high photocatalytic sulfonation of some phenolic compounds using SO2 as a sulfonating agent along with the existence of p-nitroactanilide derivatives. The conversion of p-nitroacetanilide followed the combination processes of adsorption and catalytic oxidation–reduction reactions. Construction of an online continuous flow reactor–high-resolution time-of-flight mass spectrometry system had been investigated, realizing real-time and automatic monitoring of completion the reaction. 4-nitroacetanilide derivatives (1a-1e) was converted to its corresponding sulfamic acid derivatives (2a–2e) in 93–99% isolated yields of within 60 s. It is expected to offer a great opportunity for ultrafast detection of pharmacophores.

Green synthesis of ZnO-TiO2/RGO nanocomposites using Senna surattensis extract: a novel approach for enhanced anticancer efficacy and biocompatibility

“…The peaks detected at 1374.24 cm −1 and 1614.85 cm −1 were assigned to the stretching vibrations of C-O and C-H bonds, respectively, in agreement with an earlier study. 45,46 Furthermore, the stretching vibrations of H-O groups were associated with the band at 3423.10 cm − , 1 as reported in the previous study. 47 Fig.…”

Hydrophobic ionic liquid (IL)-based magnetic adsorbents: the way forward to remediate water pollution

“…The following equation was used to calculate the adsorption efficiency of the synthesized NPs for both CV dye and Cr( vi ): 40 where C e represents the residual dye concentration (mg L −1 ) and C i stands for the initial dye concentration (mg L −1 ). The dye concentration values for all the samples prior to and post adsorption were obtained using the equation shown below to calculate the amount of dye adsorbed: 41 where m denotes the mass of adsorbent (g), q e (mg g −1 ) denotes the amount of CV dye adsorbed by the NPs at equilibrium, and V stands for the volume of the solution (L).…”

A Review of Synthesis Methods, Modifications, and Mechanisms of ZnO/TiO2-Based Photocatalysts for Photodegradation of Contaminants

“…The first group can be refined by suitable sieves that remove the pollution physically. The latter group of air pollutants must be removed through purification by some chemical conventional methods such as adsorption, ionization, plasma technologies, and photocatalytic decomposition. , The second group of air pollutants primarily consists of NOx, SOx, CO 2 , and volatile organic compounds (VOCs) . The origins of gaseous pollutants are some processes that occur in the landfill naturally and or industrial activities of human beings .…”