This work mainly focuses on unveiling the particle dynamics features of black holes. For this objective, we utilize the charged black hole geometry consisting of the cloud strings and quintessence under the ansatz of Rastall gravity. We have calculated and analyzed the effective potential, angular momentum, particle energy, horizon radius, inner stable circular orbit, photon sphere radius, quasi-periodic oscillations, and effective force to reveal the dynamical features. We in detail discussed the effects of charge in black hole, Rastall parameter, strings of cloud parameter, and quintessential parameter on the calculated results. To ensure the scenario of accelerated expansion, ω _q lies in the range −1 < ω _q < −1/3. From this specific range, we choose ω _q = −2/3.

EDA-g-PAN NFs membrane was prepared via electrospinning and chemical grafting techniques. Grafting (64%) with no change in the physical nature and colour was confirmed by FT-IR spectra. Adsorption kinetics of methylene blue (MB), rhodamine B (RB) and safranin T (ST) dyes onto PAN and EDA-g-PAN NFs membranes showed equilibrium time of around ~60 min. The adsorption kinetic followed pseudo-second-order model and intraparticle diffusion was not the only rate-limiting step. The adsorption data for the dyes fitted well to Langmuir and Freundlich equations. The order of adsorption capacity (q_max) obtained from Langmuir plot was: MB (94.07 mg/g) < ST (110.62 mg/g) < RB (138.69 mg/g). These values are more than most of the values reported in literature.

Based on the First-principles calculations, we have investigated the opto-electronic properties of AlGaX ₂ (X = As, Sb). We find that the AlGaX ₂ (X = As, Sb) is energetically stable due to lower formation enthalpy. Additionally, the dynamical stability is also confirmed by phonon calculation and found no-imaginary frequencies in the phonon-spectra. Interestingly, both AlGaAs ₂ and AlGaSb ₂ compounds possesses semiconductor nature with a direct bandgap of 1.40 eV and 0.70 eV, respectively. For the technological applications of AlGaX ₂ (X = As, Sb), we have analyzed optical properties in terms of absorption of photon energy and polarization. A strong absorption peaks are observed in the visible region. Moreover, the thermoelectric properties are calculated in terms of electrical/thermal conductivities, Seebeck coefficient, and figure of merit (ZT). Thermal parameters are critical for determining a material’ thermal stability across the wide range of temperatures. We expect that our calculated properties of AlGaAs ₂ and AlGaSb ₂ compounds could pave a new route for the applications in the optoelectronics and thermoelectric devices.

Active photocatalysts with an efficiency of 99% were prepared for the degradation of the industrial dye, methylene blue (MB), under visible light irradiation. These photocatalysts comprised Co/Ni-metal–organic frameworks (MOFs), to which bismuth oxyiodide (BiOI) was added as a filler to prepare Co/Ni-MOF@BiOI composites. The composites exhibited remarkable photocatalytic degradation of MB in aqueous solutions. The effects of various parameters, including the pH, reaction time, catalyst dose, and MB concentration, on the photocatalytic activity of the prepared catalysts were also evaluated. We believe that these composites are promising photocatalysts for the removal of MB from aqueous solutions under visible light.