In the present investigation, we report a rapid and green mechanochemical approach for the synthesis of carboxy substituted Schiff-Base polymer (cPSB) and MWCNT coated with cPSB composite (cPSB@MWCNTs) as an efficient adsorbent for cationic methylene blue MB dye. The as-synthesized cPSB and cPSB@MWCNTs were characterized by Fourier-transformed infrared spectrometer (FTIR), X-ray diffraction (XRD) and Scanning electron microscopy (SEM) to analyze the structure, size and morphology. Effects of different variables such as catalyst loading, contact time, effect of initial dye concentration and pH of the medium during the process of dye adsorption were studied. Adsorption was in agreement with the pseudo-second-order and is a chemisorption process according to the kinetic analysis. The adsorption equilibrium data for the dye adsorption process fitted well with the Langmuir model. In cPSB@MWCNTs, the removal efficiency of MB was found to be 99 % in 90 min at pH 7. The adsorption of dyes on cPSB@MWCNTs from thermodynamic data was found to be spontaneous and endothermic with a continuous decrease in entropy. Further cPSB@MWCNTs composite demonstrated admirable maximum adsorption capacity towards both MB (96.9 mg g−1) indicating cPSB@MWCNTs as an efficient cationic dye adsorbent.
The present investigation details the synthesis and photocatalytic performance of an organic-inorganic hybrid system involving phthalocyanine-based 2D polyamide sensitized CuO photocatalyst in the presence of low-power LED visible light. Zinc phthalocyanine-based 2D polyamide (2D-ZnPcPA), CuO nanomaterial and their nanocomposites (2D-ZnPcPA@CuO) were successfully synthesized and characterized by Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM) to understand the structure, size, morphology and optical properties. To examine the photodegradation capability of newly synthesized photocatalysts in the presence of the low-power white LED (16 W) as a source of visible light, cationic methylene blue (MB) and anionic congo red (CR) dyes were employed as modular pollutants. The impact of different parameters on photocatalytic activity such as photocatalyst dosage, contact time, pH of dye solution and photocatalyst re-usage, is examined. The results indicate that photosensitizing CuO with 2D-ZnPcPA improved photocatalytic performance for the photodegradation of MB and CR dyes substantially. The removal effectiveness of MB and CR under optimised conditions was determined to be greater than 96 and 93% in 90 minutes respectively.
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