Nutraceutical industrial chillies stalk waste as a new adsorbent for the removal of Acid Violet 49 from water and textile industrial effluent: adsorption isotherms and kinetic models

Abstract

a b s t r a c tFirst-ever study on the adsorption of Acid Violet 49 (AV49) dye, onto nutraceutical industrial chillies stalk waste (NICSW) is reported. A two-level fractional factorial experiment design and analysis of variance (ANOVA) were adopted to study how initial concentration of the dye, adsorbent dosage, duration of adsorption process, speed of agitation, pH of the reaction mixture and temperature affect the adsorption process. The adsorption capacity of NICSW at equilibrium was analyzed using Langmuir, Freundlich, Jovanovic, Temkin, Dubinin-Radushkevich and Harkins-Jura isotherms. The pseudo-first-order and pseudo-second-order models were considered for kinetic studies. Maximum adsorption capacity of 45.40 mg/g was obtained by Langmuir isotherm as against the experimental value of 29.00 mg/g, with correlation coefficient of 0.979 at near neutral pH. NICSW was characterized by Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller, scanning electron microscope and energy dispersive X-ray spectroscopy. Elemental (C, H, N, S) analyses of the adsorbent were conducted. Along with thermodynamic parameter evaluation such as Gibb's free energy, enthalpy and entropy and results of the surface characterization showed that the dye adsorption onto the biosorbent has taken place such as a physical process. These results proved that NICSW is a fast and effective adsorbent to remove AV49 from water and textile industrial effluent.

Bioremediation of Textile Industrial Effluents Using Nutraceutical Industrial Spent: Laboratory-Scale Demonstration of Circular Economy

“…Mathematical models of adsorption reaction and adsorption diffusion are proposed to determine the importance of diffusion in the adsorption process of the adsorbate onto adsorbent [ 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. We have resorted to a functional empirical relationship of the uptake of the substrate at a given time q t varying almost proportionally with t 1/2 .…”

Adsorption Method for the Remediation of Brilliant Green Dye Using Halloysite Nanotube: Isotherm, Kinetic and Modeling Studies

“…To identify specific model(s) with a smaller gap between experimental q e and Qm values, five isotherm models are Radke-Prausnitz, Vieth-Sladek, Redlich-Peterson, Brouers-Sotolongo, and Toth-were also studied. The importance of these models is described by us elsewhere [37]. To describe the heterogeneous adsorption system, the empirical mathematical equation was developed by Toth [38].…”

A Recent Study on Remediation of Direct Blue 15 Dye Using Halloysite Nanotubes

“…The adsorption isotherm empirical model proposed by Dubinin-Radushkevich [30] describes adsorption by filling the pore of the adsorbent A value of 110.59 mg g −1 for q s con-trasts with the Langmuir and Jovanovic models (Table 2). Additionally, a value of 0.97 for the correlation coefficient (R 2 ) confirms that the process of adsorption is linear (Figure 7b).…”