Process Optimization and Modeling of Methylene Blue Adsorption Using Zero-Valent Iron Nanoparticles Synthesized from Sweet Lime Pulp

Abstract

The presence of dyes in waterbodies poses severe problems in human and aquatic creatures, and the development of treatment methods for the removal of these pollutants is of utmost importance. This research study investigates the elimination of methylene blue (MB) from an aqueous solution using zero-valent iron nanoparticles synthesized from sweet lime pulp waste (nZVISLP). The purity, chemical composition, and crystalline size of nZVISLP were investigated using microscopic and spectroscopic studies. A maximum MB removal efficiency of 98.9% was obtained at the following optimal conditions: C0: 10 mg/L, dosage: 1.2 g/L, and temperature: 25 °C. To understand the adsorptive removal characteristics of nZVISLP, the investigational adsorption data were tested with conventional kinetic and isotherm models. Furthermore, a differential evolution optimization (DEO) technique was used to estimate the optimal intrinsic parameters in the isotherm and kinetic models. For the various evaluated isotherms, the correlation coefficient (R2) values for the Freundlich and Sips isotherm models were ~0.98, thus confirming the aptness of these isotherms to represent MB adsorption onto nZVISLP. The robustness of non-linear models was verified by statistical metrics, thus validating the performance of the optimization technique. The results derived from this study affirm the potential of an ecofriendly biogenic nanomaterial, nZVISLP, for MB adsorptive removal.

Green Synthesis of Nano-Zero-Valent Iron Using Ricinus Communis Seeds Extract: Characterization and Application in the Treatment of Methylene Blue-Polluted Water

“…Furthermore, K 1 values decrease with increase in the initial concentration of MB dye, revealing that the adsorption of MB by RC-nZVI is a physical adsorption reaction. The removal of MB by biowaste granules also fitted to pseudo-first-order in a study performed by Jaiyeola et al and another study performed by Sahu et al They found that the adsorption of MB onto nZVI follows the pseudo-first-order kinetic model. The Elovich model effectively describes the interaction between a solid and liquid interface, and takes into account that the real solid surface is energetically heterogeneous and that the desorption process and interactions between adsorbed species have little effect on the adsorption kinetics .…”

Removal of fluoride from an aqueous solution by batch and column process using activated carbon derived from iron infused Pisum sativum peel: characterization, Isotherm, kinetics study

“…After comparing of these isotherm models, it is revealed that Freundlich model fitted well (R 2 = 0.995) than Langmuir model (R 2 = 0.979). Table 1 shows that Q o value of MPPAC-500 was 4.717 mg/g which is quite higher than data available in literature, vitex negundo plant carbon 1.150 mg/g [30], treated banana peel 0.395 mg/g and treated coffee husk 0.416 mg/g [39]. The R L values was ranged between 0-1 (R L -0.22) indicating the favourable fluoride adsorption onto MPPAC-500 [37].…”

“…Zeta potential of MPPAC-500 was studied at different pH (2-10) by using the (Zeta Nano Zs90, Malvern Instrument). The value of Zeta potential indicates the stability or instability of the material in dispersed medium [30]. Zeta potential was found to be +56 mV at pH-4 that is shown in Fig.…”

Evaluation of Heterocyclic Aromatic Compound Dye (Methylene Blue) on Chitosan Adsorbent Sourced from African Snail Shell: Modelling and Optimization Studies

“…[1][2][3]. Among the myriads of pollutants reported in the literature ravaging the environment mostly the aquatic is the heterocyclic aromatic compound dye compounds such as methylene blue [4][5].…”