Showing papers by "Altaf Hussain Pandith published in 2022"

Catalytic propensity of biochar decorated with core-shell nZVI@Fe3O4: A sustainable photo-Fenton catalysis of methylene blue dye and reduction of 4-nitrophenol

Abstract: The zerovalent iron nanoparticles (nZVI) tend to agglomerate, therefore, exhibit reduced adsorption and catalytic activity. To overcome this, we decorate novel peach skin-derived fibrous biochar (FBC) with spherical nZVI to develop a sustainable and more robust nano-catalytic material. The nanocatalyst material, hereafter nZVI-FBC was well characterized by FTIR, XRD, TGA, SEM, FE-SEM, TEM, HR-TEM, and XPS analysis. Furthermore, XRD, HR-TEM, and XPS analysis rationalize the surface passivation of nZVI to form nZVI@Fe 3 O 4 core-shell nanostructure. We applied nZVI-FBC particles for the superior photo-Fenton degradation of methylene blue (MB) dye and catalytic reduction of 4-nitrophenol (4-NP) as model contaminants. At optimum batch conditions, temp= 25 o C,initial MB concentration= 20 mgL -1 ,and pH= 4.5 ± 0.3,the photo-Fenton degradation of MB obey pseudo-first-order kinetic model with a q e,exp value of 19.94 mgg -1 . The LC-MS analysis confirms mineralization of MB and ESR studies demonstrate the presence of HO radical as a principal reactive oxygen species (ROS). Furthermore, the cyclic voltammetry (CV) and electrochemical impedance spectroscopic (EIS) studies rationalize the pseudo-capacitive nature of the nanocatalyst with biochar component acting as an electron-donating framework. The-nZVI-FBC exhibit a superfast and superior catalytic performance for the reduction of 4-NP to 4-aminophenol. The nZVI-FBC shows excellent stability and reusability over multiple catalytic cycles. • We decorate novel peach skin derived fibrous biochar with nZVI@Fe 3 O 4 core-shell nanoparticles. • Core-shell decorated biochar effectively catalyze photo-Fenton degradation of MB dye and reduction of 4-nitrophenol. • Almost complete mineralization of MB was achieved at pH 4.5 with minimum H 2 O 2 input. • The cyclic voltammetry and impedance studies characterize the MB sensing and charge transport. • The nanocatalyst is a magnetically separable with excellent reusability.

Synthesis and ion exchange behavior of acrylonitrile-based zirconium phosphate A new hybrid cation exchanger

Abstract: Acrylonitrile-based zirconium phosphate (AcZP) has been prepared as a new hybrid cation exchange material. Out of a lar·ge number of samples prepared, the one selected for detailed studies has anNa+ i.e.c

Fe3S4 nanoparticles wrapped in g-C3N4 matrix: an outstanding visible active Fenton catalysis and electrochemical sensing platform for Lead and Uranyl ions

Abstract: Fe3S4 commonly known as greigite is a transition metal chalcogenide and has attracted enormous attention in the field of energy storage and environmental remediation. Herein, graphitic carbon nitride (g-C3N4) encapsulated...

Transition‐metal‐based pentalene complexes as hydrogen storage materials—a theoretical view

Abstract: Hydrogen fuel, as an alternative renewable energy resource, has recently attracted much attention for meeting global energy crisis and environmental sustainability. However, the storage of hydrogen as a neat fuel in economical and technological feasible forms to replace the widespread use of fossil fuels in diverse applications is still a formidable challenge to scientists. As per earlier reports, metal‐doped pentalenes were found to be promising candidates for hydrogen storage as per their storage capacity but were found to possess certain thermodynamic constraints. Our calculations show that transition metal–doped pentalenes can exhibit a hydrogen storage capacity of 3.68% to 7.73% with an average adsorption energy of 0.66 to 1.23 eV/H2 without any thermodynamic limitations. We have evaluated various physico‐chemical parameters and hydrogen storage calculations that include adsorption energy, Gibbs free energy, and reactivity descriptors, which assist in understanding the comparative structure and properties of these pentalene‐based systems at the electronic structure level. In addition to that, these pentalenes were doped with two homo and hetero transition metals to enhance their storage capacity. Thermo‐chemistry‐based calculations have been performed in order to understand their working temperature and desorption behavior. The calculations based on energy gaps have proven the pentalenes to be kinetically stable. Details related to bond distance, charge density, single point energy, orientation, and mode of adsorption were also calculated for both the parent and their boron substituent complexes to provide a detailed idea about their hydrogen storage behavior. This study could open a new window, toward the use of pentalenes as hydrogen storing systems in near future.