Optimization of the process parameters for the removal of reactive yellow dye by the low cost Setaria verticillata carbon using response surface methodology: Thermodynamic, kinetic, and equilibrium studies

Abstract

A low cost adsorbent prepared from material of biological origin Setaria verticillata (Grasses) has been utilized as an adsorbent for the removal of Reactive Yellow 15 (RY15) dye from an aqueous solution. The combined effect of the initial pH, adsorbent dose, and initial dye concentration was investigated using Response Surface Methodology (RSM). The most influential adsorption factor on each adsorption experimental design response was identified from the Analysis Of Variance (ANOVA). The experimental values of percentage removal were found to be in good agreement with the predicted values. pH value of 2, initial RY15 concentration of 50 mg L 21 and adsorbent dose of 50 mg are found to be the optimum conditions, for adsorption of RY15 from an aqueous solution. Thermodynamic parameters such as change in standard free energy change, enthalpy and entropy DG o , DH o , and DS o have been evaluated, and it has been found that the adsorption process is feasible, exothermic and spontaneous in nature. The experimental data were analyzed by the Langmuir, Freundlich, Sips and Temkin adsorption isotherms. Maximum monolayer adsorption capacity of the RY15 dye is found to be 138.6 mg g 21. The experimental data fitted well with the pseudo-second order kinetic model.

Production and Characterization of Melanin from Streptomyces Cavourensis Strain RD8 Using Response Surface Optimization

“…Due to the economic viability of the melanin production; the optimization of the parameters are a pre-requisite (Guo et al, 2014). The chemometrics are the most promising tools for the proces and product optimization, finding pervasive applications (Karthikeyan et al, 2014;Vidhyadevi et al, 2014;Kumar et al, 2012).The present study describes melanin production from actinomycete isolated from Gulf of Khambhat (GoK) and also focuses on screening of macronutrients and quantifying operational parameters using chemometrics. The research also evaluates the antibacterial and antioxidant activities of the purified melanin against the abiotic stresses.…”

Removal of noxious dye—Acid Orange 7 from aqueous solution using natural pumice and Fe-coated pumice stone

“…A c c e p t e d M a n u s c r i p t 6 The most usual adsorbent is activated carbon, which appears especially useful for the removal of organic pollutants [21][22][23]. However, due to their cost, the replacement of commercial activated carbon by naturally available and low-cost adsorbents has attracted considerable interest in recent years.…”

Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

“…This equation can singly be applied on adsorption data to identify whether the adsorption is monolayer or heterogenous. Numbers of papers have reported the suitability of R-P isotherm over Langmuir and Freundlich equations describing adsorption systems [33][34][35]. R-P proposed the following nonlinear equation:…”

“…(d) Lagergren's pseudo-second-order adsorption kinetics for As(V). studied and applied model by scientific fraternity to understand adsorbate diffusion behavior [32,34]. Intraparticle diffusion model can be represented as…”

“…Such a deviation from origin indicated that pore diffusion is the ratecontrolling step. As studies were performed on very small particles (3-5 nm) and at high stirring speed (300 rpm), the film diffusion could not be the rate-limiting step [34].…”