Phosphate removal from synthetic and treated sewage effluent by carbide derive carbon. (August 2020)

• Record Type: Journal Article
• Authors: Almanassra, Ismail W.; Kochkodan, Viktor; Subeh, Mosab; Mckay, Gordon; Atieh, Muataz; Al-Ansari, Tareq
• Is Part Of: Journal of water process engineering. Volume 36(2020)
• Publication Date: 2020-08
• Subjects: Carbide derived carbon -- Phosphate adsorption -- Adsorption isotherms -- Treated sewage effluent -- Competitive anions; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2020.101323
• Languages: English
• ISSNs: 2214-7144

Abstract

Graphical abstract: Highlights: Phosphate adsorption on carbon derived carbon (CDC) was studied. Adsorption data were fitted to different adsorption isotherms models. Adsorption fitting suggests a monolayer coverage with some heterogeneity of adsorption sites. Adsorption kinetic was fast and follows the pseudo second order model. Phosphate removal from treated sewage effluents with CDC was performed. Abstract: In the present work, a sequence of adsorption tests were implemented to assess the adsorption of Phosphate (PO4 3− ) from synthetic wastewater and treated sewage effluents using carbide derived carbon (CDC). Characterization outcomes of the CDC show a highly microporous material with a point zero of charge (PZC) of 9.9. The successful detection of PO4 3- onto CDC was conducted by energy dispersive spectroscopy. The influence of operational factors (pH value, temperature, CDC dosage, agitation speed and PO4 3− feed concentration) on the adsorption uptake were evaluated in batch mode. The kinetic adsorption data could be represented by the pseudo-second order model and it shows that the PO4 3− is rapidly and efficiently removed by CDC throughout a wide range of pH, mainly due to the high PZC. Adsorption isotherm data were in compliance with Langmuir, Redlich Peterson and Sips models suggesting a monolayer coverage with some possible heterogeneity of CDC adsorption sites. The determined thermodynamic parameters point out that PO4 3- adsorption through CDC is endothermic, feasible and spontaneous. Remarkably, the CDC demonstrated an adsorption uptake of PO4 3− of 16.14 mg/g. The adsorption uptake was not affected by the temperature, however; the rate of PO4 3− removal was promoted by temperature. It was shown that residual PO4 3− was completely removed from local treated sewage effluent by using CDC, however raising the ionic strength of the feed and the presence of coexisting anions was found to decrease the adsorption uptake of the sorbent. Furthermore, the adsorbed PO4 3− was efficiently desorbed by 0.01 mol/L HCl solution.