Kinetic and isotherm studies of bisphenol A adsorption onto orange albedo(Citrus sinensis): Sorption mechanisms based on the main albedo components vitamin C, flavones glycosides and carotenoids

Orange albedo and its adsorption capacity towards bisphenol A (BPA) were studied. Adsorption experiments were conducted in batch mode at 25-55°C. Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Brunauer−Emmett−Teller (BET) and Fourier transfor...

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Bibliographic Details
Published in:	Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Vol. 52; no. 8; pp. 757 - 769
Main Authors:	Kamgaing, Theophile, Doungmo, Giscard, Melataguia Tchieno, Francis Merlin, Gouoko Kouonang, Jimmy Julio, Mbadcam, Ketcha Joseph
Format:	Journal Article
Language:	English
Published:	England Taylor & Francis 03-07-2017 Taylor & Francis Ltd
Subjects:	Adsorbates Adsorbents Adsorption Adsorption mechanisms Albedo Ascorbic acid Ascorbic Acid - analysis batch adsorption Bearing strength Benzhydryl Compounds - analysis Benzhydryl Compounds - chemistry Bisphenol A bisphenol A trapping Carotenoids Carotenoids - analysis Chemical bonds Citrus sinensis Citrus sinensis - chemistry Crop residues Dosage Electron microscopy Energy dispersive X ray spectroscopy Flavones Flavones - analysis Fourier analysis Fourier transforms Fruit - chemistry Glycosides Glycosides - analysis Hydrogen Hydrogen bonding Hydrogen-Ion Concentration Infrared spectroscopy Isotherms Kinetics Microscopy, Electron, Scanning Models, Theoretical orange albedo Phenols Phenols - analysis Phenols - chemistry Residues Scanning electron microscopy Sorption Spectroscopy Spectroscopy, Fourier Transform Infrared Spectrum analysis Surface chemistry Surface Properties Vitamin C Water Pollutants, Chemical - analysis Water Pollutants, Chemical - chemistry Water Purification - methods X-Ray Diffraction X-ray spectroscopy X-rays bisphenol A trapping Adsorption mechanisms orange albedo batch adsorption
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Summary:	Orange albedo and its adsorption capacity towards bisphenol A (BPA) were studied. Adsorption experiments were conducted in batch mode at 25-55°C. Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Brunauer−Emmett−Teller (BET) and Fourier transform infrared (FTIR) spectroscopy were used to characterise the biosorbent. The effects of various parameters including adsorption time, equilibrium pH, adsorbent dosage and initial adsorbate concentration were investigated. The optimum contact time and pH for the removal of BPA were 60 min and 2, respectively. It was found that the adsorption isotherms best matched the Freundlich model, the adsorption of BPA being multilayer and that of the albedo surface heterogeneous. From the kinetic studies, it was found that the removal of BPA best matched the pseudo-second order kinetic model. An adsorption mechanism based on the albedo surface molecules is proposed and gives a good account of π-π interactions and hydrogen bonding. Orange albedo, with a maximum BPA loading capacity of 82.36 mg g −1 (significantly higher than that of most agricultural residues), is a good candidate for BPA adsorption in aqueous media.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1093-4529 1532-4117
DOI:	10.1080/10934529.2017.1303315