Highly Efficient Methylene Blue Dye Removal by Nickel Molybdate Nanosorbent

Abstract

Removing methylene blue (MB) dye from aqueous solutions was examined by the use of nickel molybdate (α-NiMoO4) as an adsorbent produced by an uncomplicated, rapid, and cost-effective method. Different results were produced by varying different parameters such as the pH, the adsorbent dose, the temperature, the contact time, and the initial dye concentration. Adsorbent dose and pH had a major removal effect on MB. Interestingly, a lower amount of adsorbent dose caused greater MB removal. The amount of removal gained was efficient and reached a 99% level with an initial methylene blue solution concentration of ≤160 ppm at pH 11. The kinetic studies indicated that the pseudo-second-order kinetic model relates very well with that of the obtained experimental results. The thermodynamic studies showed that removing the MB dye was favorable, spontaneous, and endothermic. Impressively, the highest quantity of removal amount of MB dye was 16,863 mg/g, as shown by the Langmuir model. The thermal regeneration tests revealed that the efficiency of removing MB (11,608 mg/g) was retained following three continuous rounds of recycled adsorbents. Adsorption of MB onto α-NiMoO4 nanoparticles and its regeneration were confirmed by Fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscopy (SEM) analysis. The results indicated that α-NiMoO4 nanosorbent is an outstanding and strong candidate that can be used for removing the maximum capacity of MB dye in wastewater.

Structural control of V2O5 nanoparticles via a thermal decomposition method for prospective photocatalytic applications

“…The thermodynamic factors can assess the probability and mechanism of adsorption [34]. The Gibbs free energy (ΔG°), enthalpy (∆H°), and entropy (ΔS°) are utilized to determine the nature of the adsorption mechanism and the adsorbent suitability [35].…”

Integrating rod‐shaped nickel molybdate@polypyrrole matrix for sustainable adsorptive removal of organic dye: Kinetics, isotherm, and thermodynamics study

“…The aquatic ecosystem is thus severely affected by dye wastewater released from industries 2 . Dyes such as methylene blue (MB) dye, malachite green (MG), and rhodamine B (Rh B) were chosen for this study as they are extensively used in the manufacturing of food coloring agents as well as in cotton, wool, silk, and leather dyeing 3–5 …”

“…It is also used in various other applications like photocatalytic degradation, lithium‐ion batteries, and electrochemical glucose sensors 8–10 . There are several methods for synthesizing NiMoO 4 , like the thermometric, sonochemical, and coprecipitation methods, which use various kinds of precursors under different conditions 3,11,12 …”

“…2 Dyes such as methylene blue (MB) dye, malachite green (MG), and rhodamine B (Rh B) were chosen for this study as they are extensively used in the manufacturing of food coloring agents as well as in cotton, wool, silk, and leather dyeing. [3][4][5] While there are several biological, physical, and chemical methods for the removal of dyes from water, the quest for better and more effective methods is an ongoing challenge. Adsorption, or the physical method, is one of the most efficient methods for sustainable dye removal.…”

“…[8][9][10] There are several methods for synthesizing NiMoO 4 , like the thermometric, sonochemical, and coprecipitation methods, which use various kinds of precursors under different conditions. 3,11,12 Polypyrrole (PPy) is one of the most commonly used adsorbents due to its nontoxic nature, stability, low cost, and simple preparation method. It is used in various applications like fuel cells, biosensors, and supercapacitors.…”