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Chemometrics approach for optimization of simultaneous adsorption of Alizarin red S and Congo red by cobalt hydroxide nanoparticles
Author(s) -
Zolgharnein Javad,
Bagtash Maryam,
Asanjarani Neda
Publication year - 2017
Publication title -
journal of chemometrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.47
H-Index - 92
eISSN - 1099-128X
pISSN - 0886-9383
DOI - 10.1002/cem.2886
Subject(s) - sorbent , adsorption , alizarin red , nanoparticle , congo red , cobalt , central composite design , cobalt hydroxide , chemistry , response surface methodology , hydroxide , aqueous solution , chemometrics , sodium hydroxide , nuclear chemistry , materials science , inorganic chemistry , chromatography , nanotechnology , organic chemistry , medicine , staining , electrode , pathology , electrochemistry
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, C AR (initial AR concentration) = 351 mg/L, and C CR (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.