Removal of toxic thymol sulfone phthalein dye from wastewater by using efficient adsorbent NiO nanoparticles

•The removal of thymol sulfone phthalein by NiONPs has been investigated spectrophotometrically.•Study variables such as contact time, initial dye concentration, adsorbent dose, temperature and pH.•Langmuir and Freundlich isotherm models were used to illustrate the equilibrium of the adsorption.•A p...

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Bibliographic Details
Published in:Journal of molecular structure 2022-12, Vol.1269, p.133864, Article 133864
Main Authors: Hassanien, Reda, Hassan, Zeinab A., Al-Assy, Waleed, Ibrahim, Samia M.
Format: Article
Language:English
Subjects:
Adsorption
Dyes
Kinetics
NiONPs
Thymol sulfone phthalein
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Summary:•The removal of thymol sulfone phthalein by NiONPs has been investigated spectrophotometrically.•Study variables such as contact time, initial dye concentration, adsorbent dose, temperature and pH.•Langmuir and Freundlich isotherm models were used to illustrate the equilibrium of the adsorption.•A pseudo-second-order mechanism governs the absorption of thymol sulfone phthalein onto NiONPs. NiONPs was synthesized from Ficus Nitida plant under control conditions and which is considerably efficient for removal of dyes from wastewater. The obtained NiONPs was identified by Fourier transform infrared spectra (FTIR), Scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy dispersive x-ray spectroscopy (EDX), Transmission electron microscopy (TEM) analyses and surface area. The removal of toxic thymol sulfone phthalein (TSP) dye by an efficient adsorbent NiONPs has been investigated spectrophotometrically. Variables such as contact time, initial dye concentration, adsorbent dose, temperature and pH of dye solution were studied. Langmuir and Freundlich isotherm models were used to illustrate the equilibrium of the adsorption. The correlation coefficient values of Langmuir and Freundlich equations were found to be in good agreement. A pseudo-second-order mechanism governs the absorption of TSP onto NiONPs. A spontaneous and exothermic process, adsorption was a spontaneous process. In addition, the thermodynamic parameters have been analyzed, and an appropriate reaction mechanism has been presented and discussed in this paper. SEM micrographs of NiONPs: (a) before adsorption, (b) after thymol sulfone phthalein dye adsorption. [Display omitted]
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2022.133864