Multi-walled carbon nanotubes (MWCNTs) were synthesized at temperatures between 550 °C and 750 °C using a silica-supported Fe-Mo catalyst via chemical vapor deposition with Cymbopogon flexuosus oil under a nitrogen atmosphere. The as-grown MWCNTs were characterized using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and Raman spectroscopy. HRTEM and Raman studies confirmed the formation of MWCNTs with outer diameters ranging from 20 to 40 nm.
This study synthesizes corrosion-resistant counter electrodes for DSSCs, comparing their efficiency with carbon electrodes. The Power Conversion Efficiency (PCE) of a MWCNT-based DSSC counter electrode is compared with that of a carbon-coated DSSC. MWCNTs were prepared by spray pyrolysis, and TiO2 nanoparticles by Wet Chemical Technique (WCT). XRD analysis confirmed the anatase phase of TiO2 at 2θ = 25.3 and the hexagonal graphite structure of MWCNTs at 2θ = 25.9.
This study fabricated a Tin oxide-doped Zinc Oxide (TZO) photocatalyst using the drop-by-drop method, producing nano TZO to enhance the photocatalytic decolorization of Basic Violet 10 dye. Structural and surface morphology were examined with XRD, SEM, and EDAX. The TZO photocatalyst effectively degraded Basic Violet 10 dye under sunlight, achieving complete degradation within 120 minutes.
This study develops an Artificial Neural Network (ANN) model to predict the adsorption efficiency of multi-walled carbon nanotubes (MWCNTs) for Cr(VI) removal. MWCNTs were synthesized from Neem oil via CVD at 750°C with an alumina-supported Fe-Co-Mo catalyst, achieving 9-14 nm diameters. Adsorption studies showed alignment with the Langmuir isotherm and pseudo second-order kinetics. Optimized with Box-Behnken design, the best ANN model (Levenberg - Marquardt algorithm, 14 hidden neurons) achieved high accuracy (MSE: 0.0324, R²: 0.99512), confirming ANN's predictive efficiency for Cr(VI) removal.
This study fabricated a Tin oxide-doped Zinc Oxide (TZO) photocatalyst using the drop-by-drop method, aimed at enhancing the photocatalytic decolorization of Basic Violet 10 dye. Structural and surface properties were analyzed via XRD, SEM, and EDAX. The TZO photocatalyst effectively degraded Basic Violet 10 dye under sunlight, achieving complete degradation within 120 minutes.
A Factorial Experimental Design (FED) was applied to study Cr(VI) adsorption from wastewater using Cucumis melo peel activated carbon (CMAC). Structural features were characterized by FTIR and SEM, while batch experiments analyzed the effects of pH (3-9), adsorbent dosage (50-250 mg), and metal ion concentration (100-400 mg/L) on adsorption. A 23 factorial design assessed parameter interactions, with statistical analysis (t-test, ANOVA, F-test) confirming model fit. Optimization plots revealed CMAC's strong potential as an efficient Cr(VI) adsorbent.