Decontamination of cationic dye brilliant green from the aqueous media

Abstract

Brilliant green is a synthetic and toxic dye that is currently being utilized for various purposes, such as dying paper, leather, wool, and silk. The present study demonstrates the activated carbon preparation from waste banana peels as well as its usefulness to remove cationic dye brilliant green from aqueous medium. The dye removal was examined under a set of diverse conditions. The obtained results indicate that dye adsorption was maximum after 60 min of contact time. The removal of brilliant green dye enhances due to a rise in adsorbent dosage and becomes quantitative at 15 min of adsorbent dose. At a pH of 2, the uptake of dye by adsorbent was maximum, which decreases with the rise in pH. Langmuir isotherm was slightly better fitted than Freundlich model at varying temperatures. The experimental value of adsorption capacity was > 900 mg/g, which was observed quite close with pseudo-second-order model for brilliant green adsorption on the prepared adsorbent based on banana peel. Thermodynamic studies suggested exothermic, spontaneous, and favorable adsorption process for brilliant green dye. The adsorbent prepared in the present study can be incorporated for the treatment of wastewater contaminated with brilliant green as well as other toxic pollutants.

Multifunctional Ternary NLP/ZnO@l-cysteine-grafted-PANI Bionanocomposites for the Selective Removal of Anionic and Cationic Dyes from Synthetic and Real Water Samples

“…It involves the reactions between functional groups that are present on adsorbent and adsorbate atoms, ions, or molecules by the formation of cation exchange reactions. The linear form of the pseudo-first-order equation is as follows log ( q e − q t ) = prefix− k 1 t 2.303 + log nobreak0em.25em⁡ q normale where q e (mg g –1 ) is the amount of the dye adsorbed by the adsorbent at equilibrium. q t (mg g –1 ) is the amount of the BG/MO dye adsorbed by NZC- g -PANI at varying times in min.…”

“…During the initial phases of adsorption, many vacant sites are available on the NZC- g -PANI nanocomposite, which, with the passage of time, decreases. Left out, vacant sites of NZC- g -PANI become difficult to occupy by BG and MO dyes due to existing repulsive forces between solute particles found on the solid adsorbent and adsorbate molecules, resulting in the slowing of the adsorption rate eventually …”

“…Left out, vacant sites of NZC- g -PANI become difficult to occupy by BG and MO dyes due to existing repulsive forces between solute particles found on the solid adsorbent and adsorbate molecules, resulting in the slowing of the adsorption rate eventually. 59 …”

“…Left out, vacant sites of NZC-g-PANI become difficult to occupy by BG and MO dyes due to existing repulsive forces between solute particles found on the solid adsorbent and adsorbate molecules, resulting in the slowing of the adsorption rate eventually. 59 Adsorption kinetics is responsible for controlling the adsorption rate, which also determines the time needed for the adsorption process to reach equilibrium. Adsorption kinetics also gives information about the path used for adsorption and the mechanism involved in the adsorption process.…”

Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

“…Generally, negative and positive values of ΔG° correspond to a spontaneous and non-spontaneous adsorption process, respectively (Eze et al 2021). Similarly, positive and negative values of ΔS° are ascribed to an increase and decrease in randomness at the adsorbent/adsorbate interface, respectively (Singh et al 2022). Furthermore, positive ΔH° is indicative of endothermic adsorption, while negative ΔH° values correspond to an exothermic process.…”