Synthesis and characterization of hexagonal boron nitride used for comparison of removal of anionic and cationic hazardous azo-dye: kinetics and equilibrium studies

Abstract

The purpose of this study was to compare the adsorption behavior of cationic and anionic dyes onto a hexagonal boron nitride (hBN) nanostructure that was rich in a negative charge. Herein, the hBN nanostructure was synthesized using boric acid as a precursor material. The characteristic peaks of the hBN nanostructure were performed using Fourier transform infrared (FT-IR) and Raman spectroscopies. The morphology and the particle size of hBN nanostructure were determined by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). During the studies, various essential adsorption parameters were investigated, such as the initial dye concentration, pH of the dye solution, adsorbent dose, and contact time. Under optimal conditions, the removal of 42.6% Metanil yellow (MY) and 90% Victoria blue B (VBB) from aqueous solution was performed using a 10-mg hBN nanostructure. Furthermore, the equilibrium studies showed that the Freundlich isotherm model fitted well for the removal of MY. However, the Langmuir isotherm model fitted well for the removal of VBB. Moreover, according to the results obtained from the kinetic studies, while the first-order kinetic model was suited for the adsorption of the MY, the second-order kinetic model was found to well fit for the adsorption of VBB.

One-Factor-at-a-Time (OFAT) Optimization of Victoria Blue R Dye Biodegradation by Pineapple Waste Garbage Enzymes

“…It reaches the highest decolorization at 0.06 mg/ml, which is 59%. Then, any additional dye substrates after reaching the equilibrium state will not affect the rate of reaction of enzymes, which concluded that the graph should be stagnant and then decrease as the concentration increases [12].…”

“…Higher dye concentration may cause lower decolorization since the dye molecules are more difficult to break down. Thus, when the concentration of dye increases, the decolorization rate decreases [12]. This is because enzymes can only break down a limited amount of dye molecules until they are overwhelmed and unable to keep up with the rate of decolorization when the concentration is high.…”

Heterostructured AgCl/BN nanomaterials with high sorption capacity and photocatalytic activity

“…AgCl nanoparticles are located on the surface of the carrier and occupy a significant share of it, thus limiting the sorption capacity of h-BN. The significant sorption capacity with respect to MB, which is a cationic dye, can be explained by the presence of a negative charge on the surface of h-BN [12]. High adsorption can also be explained by the cyclic aromatic structure of MB, which enhances the π-stacking interaction with h-BN.…”