Hybrid central composite design for simultaneous optimization of removal of methylene blue and alizarin red S from aqueous solutions using Vitis tree leaves

Abstract

Vitis tree leaves powder was used for efficient removal of dyes (eg, alizarin red and methylene blue) from water samples in binary batch systems. The influence of various parameters such as initial pH, initial dye concentration, and sorbent mass on the biosorption process was investigated. Statistical experimental design was utilized to optimize this biosorption process. A regression model was derived using a response surface methodology through performing the 416B model of hybrid central composite design. Model adequacy was checked by means of tests such as analysis of variance, a lack of fit test, and residual distribution consideration. The proposed quadratic model resulted from the hybrid design approach fitted very well to the experimental data. The optimal conditions for dye biosorption were as follows: pH = 3.0, sorbent mass = 0.05 g, initial alizarin red concentration (CAR) = 999.6 mg L−1 and initial methylene blue concentration (CMB) = 878.5 mg L−1. Evaluation of biosorption data with Langmuir and Freundlich isotherms shows that the Langmuir model indicated the best fit to the equilibrium data with maximum adsorption capacity of 66.4 and 53.5 mg g−1 in single system and 54.6 and 43.9 mg g−1 in binary system for AR and MB, respectively. Moreover, kinetics of the biosorption process was also investigated.

New modified heterocyclic-magnetite chitosan nanocomposite for efficient alizarin red dye removal: adsorption analysis and antibacterial activity.

“…The second occurs when dye molecules diffuse from the modified chitosan composite adsorbent's exterior surface into its pores. The ultimate equilibrium stage is when the dye molecules have been adsorbed on the active sites on the interior surface of the pore, and the intra-particle diffusion plot starts to slow down as the solute concentration in the solution decreases [46]. The surface adsorption mechanism predominately took place during the first 50 minutes of contact.…”

Semicarbazide Functionalized Flax Fibers for Effective Adsorption of Cr(VI) from Wastewater Samples

“…The liquid supernatant that contains the remaining un adsorbed Cr(VI) was measured. Various parameters were studied such as contact time (15-240 min), temperature parameter(25 o C-45 o C), adsorbent dose (0.025g-0.2g), pH parameter (2)(3)(4)(5)(6)(7)(8), adsorbate initial concentration (25-400mg/l), and ionic strength (0-0.2 mol/L).…”

Adsorptive Removal of Alizarin Red S onto Sulfuric Acid-Modified Avocado Seeds: Kinetics, Equilibrium, and Thermodynamic Studies

“…Adsorption is a productive method for removing dyes from industrial effluents when compared to other methods. [24][25][26][27]. Sorption via physical or chemical processes can minimize energy requirements as well as the quantity and toxicity of the resulting waste sludge, resulting in reduced environmental impacts [28].…”