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Zinc oxide nanorod‐loaded activated carbon for ultrasound‐assisted adsorption of safranin O: Central composite design and genetic algorithm optimization
Author(s) -
Sharifpour E.,
Ghaedi M.,
Nasiri Azad F.,
Dashtian K.,
Hadadi H.,
Purkait M.K.
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4099
Subject(s) - safranin , central composite design , chemistry , adsorption , langmuir adsorption model , activated carbon , nanorod , chemisorption , sorption , aqueous solution , sonication , langmuir , chemical engineering , monolayer , response surface methodology , analytical chemistry (journal) , chromatography , organic chemistry , medicine , staining , biochemistry , pathology , engineering
This paper focuses on the development of an effective methodology to obtain the optimum ultrasonic‐assisted removal of a dye, safranin O (SO), under optimum conditions that maximize the removal percentage, using ZnO nanorod‐loaded activated carbon (ZnO‐NRs‐AC) in aqueous solution. Central composite design coupled with genetic algorithm was used for parameter optimization. The effects of variables such as pH, initial dye concentration, mass of ZnO‐NRs‐AC and sonication time were studied. The interactive and main effects of these variables were evaluated using analysis of variance. The structural and physicochemical properties of the ZnO‐NRs‐AC adsorbent were investigated using field emission scanning electron microscopy and X‐ray diffraction. Adsorption equilibrium data were fitted well with the Langmuir isotherm and the maximum monolayer capacity was found to be 32.06 mg g −1 . Studies of the adsorption kinetics of the SO dye showed a rapid sorption dynamic with a pseudo‐ second‐order kinetic model, suggesting a chemisorption mechanism.