One-step synthesis of nitrogen-grafted copper-gallic acid for enhanced methylene blue removal

Abstract

Nitrogen-grafting through the addition of glycine (Gly) was performed on a metal- phenolic network (MPN) of copper (Cu2+) and gallic acid (GA) to increase its adsorption capacity. Herein, we reported a one-step synthesis method of MPN, which was developed according to the metal–ligand complexation principle. The nitrogen grafted CuGA (Ng-CuGA) MPN was obtained by reacting Cu2+, GA, and Gly in an aqueous solution at a molar ratio of 1:1:1 and a pH of 8. Several physicochemical measurements, such as Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), N2 sorption, X-ray diffraction (XRD), and thermal gravimetry analysis (TGA), were done on Ng-CuGA to elucidate its characteristics. The analysis revealed that the Ng-CuGA has non-uniform spherical shaped morphology with a pore volume of 0.56 cc/g, a pore size of 23.25 nm, and thermal stability up to 205 °C. The applicational potential of the Ng-CuGA was determined based on its adsorption capacity against methylene blue (MB). The Ng-CuGA was able to adsorb 190.81 mg MB per g adsorbent at a pH of 6 and temperature of 30 °C, which is 1.53 times higher than the non-grafted CuGA. Detailed assessment of Ng-CuGA adsorption properties revealed their pH- and temperature-dependent nature. The adsorption capacity and affinity were found to decrease at a higher temperature, demonstrating the exothermic adsorption behavior.

Experimental modelling studies on the removal of dyes and heavy metal ions using ZnFe2O4 nanoparticles

“…Auramine O (AO) and methylene blue (MB) are the most widely used dyes in the industry. Respiratory irritation, teratogenicity, and carcinogenicity in humans are the main drawbacks of poisoning by these compounds 6 , 7 . Moreover, the presence of these dyes in water sources would lead to blocking the light penetration into the water, disruption of photosynthesis, and destruction of the aquatic ecosystem.…”

Antibacterial ability and osteogenic activity of polyphenol-tailored calcium silicate bone cement

“…The band around 1200 cm −1 was assigned to the stretching vibrations of C–O in polyols, 30,31 and the one at 1030 cm −1 was due to the C–O–C bending mode. 32 The band around 870 cm −1 was the acid group of the out-of-plane bending of the O–H. 30 The C–H out-of-plane bending of the phenyl group was observed at 760 cm −1 .…”

Preparation and Optimization of Photocatalytic Polyacrylic Acid/Guar Gum/TiO2 Hydrogels for Absorption and Removing of Methylene Blue Under Visible and UV Irradiation

“…Comparison between the results of other studies confirms the effect of acrylic acid hydrogels containing photocatalytic nanoparticles prepared in this study. For example, Santoso et al showed that with increasing the pH of the environment, the rate of absorption and removal of methylene blue increased [23]. They attributed this effect to creating negative charges in the alkaline environment on the adsorbent and increasing the adsorption of MB.…”