Hybrid central composite design optimization for removal of Methylene blue by Acer tree leaves: characterization of adsorption

Asanjarani

2017

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The present study deals with the simultaneous adsorption of Alizarin Red (AR) and Congo red (CR) by cobalt hydroxide nanoparticles in a batch system. Cobalt hydroxide nanoparticles as novel and efficient adsorbent are successfully used to remove two anionic dyes from aqueous solutions simultaneously. Partial least square regression as a multivariate calibration method is developed for the simultaneous determination of AR and CR in binary solutions, to overcome the severe spectral overlap. The influence of various parameters was investigated on dye adsorption such as pH, initial concentration of dyes, and sorbent mass. A response surface methodology was achieved through performing the central composite design approach to optimize the removal percent of dyes by cobalt hydroxide nanoparticles. The proposed quadratic model resulting from the central composite design approach fitted very well with the experimental data. The optimal conditions for dye removal were pH = 5.5, sorbent dose = 43 mg, CAR (initial AR concentration) = 351 mg/L, and CCR (initial CR concentration) = 616 mg/L. Isotherm modeling and thermodynamic studies were also conducted. Furthermore, the sorbent was characterized by the Fourier transform infrared, scanning electron microscopy, and X‐ray diffraction analysis.

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Chemometrics approach for optimization of simultaneous adsorption of Alizarin red S and Congo red by cobalt hydroxide nanoparticles

Asanjarani

2017

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“…It corresponds to the interaction of dyes to C–O band (Figure B). The variation of intensity and shift of the band from 3318 to 3314 and 1068 to 1064 cm −1 confirm that 2 functional groups, both carboxyl and either amine or hydroxyl (phenolic), are involved in dye binding . Also, various absorption peaks appearing in Figure B are attributed to the adsorbed AR and MB dyes on the biosorbent.…”

Section: Resultsmentioning

confidence: 99%

“…The variation of intensity and shift of the band from 3318 to 3314 and 1068 to 1064 cm −1 confirm that 2 functional groups, both carboxyl and either amine or hydroxyl (phenolic), are involved in dye binding. 21,25 Also, various absorption peaks appearing in Figure 2B are attributed to the adsorbed AR and MB dyes on the biosorbent. The pH PZC of a material in a solution is the pH value at which the net surface charge of this material is equal to zero.…”

Section: Biosorbent Characterization By Ft-ir and Determination Of mentioning

confidence: 99%

“…It offers some advantages such as lower experimental run, time saving, and generating a resource-limited situation. [25][26][27][28] Thus, the major aim of this study is to propose a proper empirical model that would be able to show clearly the role of effective variables on dye biosorption process. Furthermore, hybrid central composite design is used as a response surface approach to find optimum conditions for maximum dye adsorption uptake capacity (q) from an aqueous solution by vitis tree leaves.…”

mentioning

confidence: 99%

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

2017

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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.

Crossed mixture‐process design for optimization of simultaneous adsorption of Tartrazine and Indigo carmine dyes by cobalt hydroxide nanosorbent

2018

The present paper focused on the removal of Tartrazine and indigo carmine from aqueous solutions by cobalt hydroxide nanosorbent. This novel and efficient nanosorbent were successfully used to remove two anionic dyes from aqueous solutions in single and binary systems. The characterization of sorbent was carried out with scanning electron microscopy micrographs, X‐ray diffraction, and Fourier transform infrared spectroscopy analysis. The simplex‐lattice mixture design was employed for optimization of adsorption process. The effective factors on adsorption such as pH, m (amount of sorbent), and C (initial concentrations of dyes) were considered using crossed mixture‐process design. The proposed quadratic model resulted from the mixture design approach fitted very well to the experimental data. Isotherm modeling and kinetic investigations showed that sips, modified sips, and pseudo‐second‐order models describe both the adsorption equilibrium and kinetic behavior well, respectively.