Adsorption of the eosin yellow dye by nickel oxide nanoparticles catalyzes via oxalate co-precipitation method: isotherm, kinetic and thermodynamic studies

Abstract

The Batch technique was used in the adsorption of eosin yellow (EY) dye from an aqueous solution by Nickel Oxide (NiO) nanoparticles (NPs). The Nickel Oxide nano-powder was synthesized by co-precipitation oxalate method and studied by x-ray diffraction (XRD), Scanning electron microscope (SEM) and Fourier transforms infrared spectroscopy (FTIR). The adsorbent Dosage, pH, contact time, and concentration of an aqueous solution were studied. Maximum eosin yellow dye removal efficiency was found to be 98.6% at pH 4, temperature 20 °C, initial dye concentration 10 mg l−1 (ppm), and the adsorbent dosage 0.05g at time 25 min. The adsorption process followed the Langmuir isotherm model with a maximum sorption capacity of 5.2167 and fitted to the pseudo-second-order kinetic model with a high correlation coefficient of 0.9941. Thermodynamic factors were determined and the obtained values refer that the adsorption of EY on NiO NPs is endothermic, non-spontaneous, and chemisorption processes.

Rapid Removal of Toxic Remazol Brilliant Blue-R Dye from Aqueous Solutions Using Juglans nigra Shell Biomass Activated Carbon as Potential Adsorbent: Optimization, Isotherm, Kinetic, and Thermodynamic Investigation

“…94 kJ mole −1 ( Table S3 ) at various dye concentrations ranging from 25 to 225 mg L −1 . The value of ΔH (40.24 kJ mole −1 > 25 kJ mole −1 ) and E a (74.249 kJ mole −1 > 40 kJ mole −1 ) indicates that dye uptake onto the WSBAC adsorbent is a chemisorption process [ 69 ]. This may explain the presence of stronger bonds between RBBR dye molecules and binding sites on the particle surface at elevated temperatures.…”

“…Kinetic experiments are performed by examining the various concentrations of RBBR dye at uniform time intervals. The percentage of dye removal is calculated by the Equation (27) [ 69 ] where C o is the initial concentration of RBBR in the aqueous solution (mg L −1 ), C t is the adsorbate concentration in the solution at a time ‘t’ (mg L −1 ), V is the total volume of the dye solution (L), and W denotes the weight of dry WSBAC adsorbent (g). To ensure that the results are reproducible, all the experiments were repeated in triplicate, and the average values obtained from these experiments are reported in Section 2 .…”

Green Synthesis of Nickel Oxide Nano particles from Lawasonia inermis leaf extract for promising Methyl red Uptake and Efficient Iodine Adsorption

“…Irving Langmuir et al introduced Langmuir adsorption model in 1932 [54]. It deals with the interaction of methyl red molecules and NiO-NPs on homogeneous sites for monolayer adsorption [55]. The straight-line equation of this model is written as…”

Preparation and characterization of nano- Fe(OH)3, its composites with two natural zeolites, and granulation of them for nitrate removal from polluted water

“…k 1 represents the pseudo-first-order rate constant adsorption (l h −1 ), k 2 stands for the pseudo-second-order rate constant adsorption (g/mg min), and k ID is representative of the particle diffusion rate constant adsorption (g/mg h 0.5 ). The thickness and boundary layer are attributed to C(mg g −1 ), while R 2 is the regression [73][74][75][76]. Calculated values are summarized in table 3.…”