CuS‐Carrageenan Composite Grown from the Gel/Liquid Interface

Abstract

The aim of this study is to highlight novel CuS‐carrageenan nanocomposites grown from the interface between sulfide solutions (liquid phases) and Cu‐ι‐carrageenan gels. Several parameters including pH, copper and carrageenan concentration of the hydrogel that influence the growth of the nanocomposite have been examined. The most effective parameter is the initial pH of the liquid phase, hence, three growing samples at pH 7, 10 and 13 were selected for further studies and referred as LPH7, LPH10 and LPH13. Three CuS‐carrageenan nanocomposites obtained from the three pH conditions were purified and examined in detail using several characterization techniques such as X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS). The structure, composition, properties as well as the growth mechanism of the nanocomposite have been studied. Additionally, the electrical conductivity of the nanocomposite was exploited to be used as a sensor of relative humidity and temperature.

Sodium Alginate–CdS Nanostructures: Reinforcing Chemoselectivity in Nitro-Organic Reduction and Dye Degradation through Photoinduced Electron Transfer

“…Similar results were observed by Zouheir et al during the growth of CuS−carrageenan composites. 46 These findings support the hypothesis that the morphology of CdS nanostructures is influenced by the alkalinity of the Na 2 S solution. Additionally, the EDX spectrum supports the existence of cadmium (Cd) and sulfur (S) along with all of the other necessary elements of SA−CdS (Figure 3d), which verifies the formation of cadmium sulfide (CdS) nanoparticles in an alginate biopolymer matrix.…”

Sodium Alginate–CuS Nanostructures Synthesized at the Gel–Liquid Interface: An Efficient Photocatalyst for Redox Reaction and Water Remediation

“…The obtained products were sequentially washed with a mixture containing 80:20 v/v % ethanol/DI water and absolute ethanol to remove the unreacted precursors. Finally, the products were lyophilized to obtain dry products …”

“…Finally, the products were lyophilized to obtain dry products. 42 Gas Adsorption−Desorption Measurements. A Quantachrome Autosorb iQ2 gas analyzer was used for the gas adsorption− desorption investigations, and ASiQwin software was used to evaluate the isotherms that were obtained.…”

Downward fingering accompanies upward tube growth in a chemical garden grown in a vertical confined geometry

“…Classical experiments of 3D gardens grown from a seed are still carried out by many scholars and have produced a lot of important results. [68][69][70][71][72] Typically, the procedure involves placing a seed crystal of metal salt at the bottom of the vessel and filling it with solution. Thereafter, precipitation occurs around the seed and forms a semi-permeable membrane, and we will then observe tubular filaments just like the upward-growing tubes reported in this paper.…”