Document Details

Document Type : Article In Journal 
Document Title :
The retention profile of phosphate ions in aqueous media onto ion pairing immobilized polyurethane foam: Kinetics, sorption and chromatographic separation
The retention profile of phosphate ions in aqueous media onto ion pairing immobilized polyurethane foam: Kinetics, sorption and chromatographic separation
 
Document Language : English 
Abstract : strategy for enriching, separating and determining the inorganic phosphate ions in water based on the use of polyurethane foam (PUFs) physically immobilized with some ion pairing or basic dyes has been reported. The retention of inorganic phosphate from the test aqueous solution containing molybdate ions onto untreated- and ion pairing reagent e.g, crystal violet (CV) or tetrabutylammoniumtetrafluoroborate (Bu4N+center dot BF4-) impregnated PUFs solid phase extractor was followed the order: unloaded < CV < Bu4N+center dot BF4- treated PUFs sorbent at pH 3.5-4.5. The kinetics of analyte sorption onto Bu4N+center dot BF4- treated PUFs at optimized pH (pH 3.4-4.5) was fast and followed first order rate equation with an overall rate constant of 0.062 min(-1). Film and intraparticle transport are the main factors controlling the rate of phosphate sorption onto the sorbent from solutions at pH = 3.5-4.5. Phosphate uptake followed Langmuir and Freundlich isotherm models. Thus, a dual-mode sorption involving absorption related to "weak base anion exchanger" and an added component for "surface adsorption" is the most probable retention mechanism for phosphate uptake by Bu4N+center dot BF4- loaded PUFs sorbent. Chromatographic separation of phosphate by Bu4N+center dot BF4- treated PUFs packed column was carried out. The number (N) and the height equivalent to the theoretical plates (HETP), critical and breakthrough capacities were found equal 81 +/- 4, 0.13 +/- 0.02 mm, 2.5 +/- 0.2 and 27.25 +/- 2.06 mg g(-1), respectively. These results suggested the use of the proposed Bu4N+center dot BF4- treated PUFs in packed column for separation of trace levels of phosphate in water. The retained phosphate were recovered quantitatively (102.6 +/- 2.4-106.2 +/- 3.2%) with NaOH (0.5 mol L-1) and analyzed. The proposed column was applied for separation and recovery of phosphate ions in waste- and seawater samples. The results were in good agreement with the spiked and expected phosphate concentrations at 95% confidence 
ISSN : 0167-7322 
Journal Name : JOURNAL OF MOLECULAR LIQUIDS 
Volume : 220 
Issue Number : 220 
Publishing Year : 1437 AH
2016 AD 
Article Type : Article 
Added Date : Sunday, August 6, 2017 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
A BashammakhBashammakh, A Researcher  

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