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RISS 인기검색어
- 검색키워드
- 저자 : M.S. El-Shahawi (검색결과 4 건)
- 무료
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M.S. El-Shahawi,A.A. Al-Sibaai,A.S. Bashammakh,H. Alwael,H.M. Al-Saidi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
The sorption profile of trace concentrations of bismuth(III) species from aqueous KI–H2SO4 media ontothe ion pairing procaine hydrochloride (PQ+.Cl ) based polyurethane foam (PUFs) was studied. A dual–mode of bismuth(III) sorption as a ternary complex ion associate [PQ+.BiI4] involving absorption due toa ‘‘weak base anion exchanger’’ and an added component for ‘‘surface adsorption’’ seems the proposedmechanism for bismuth(III) retention. The capacity of bismuth(III) sorption was found equal40.05 1.10 mg g 1. Complete separation of spiked bismuth(III) at various concentrations (5–15 mg mL 1)1) from water onto the proposed sorbent packed columns at 5 mL min 1 flow rate was successfully achieved. The retained bismuth(III) species were recovered quantitatively from the sorbent packed columns(98.4 2.4%, n = 5) with HNO3 (1.0 mol L 1). Bismuth(V) after reduction to Bi(III) was also preconcentrated,recovered from the sorbent packed column and subsequently analyzed by inductively coupled plasma–optical emission spectrometry (ICP–OES). The height equivalent to the theoretical plates (HETP), number ofplates (N), critical and breakthrough capacities of sorbent packed column towards bismuth(III) retentionwere evaluated. Based on these results, a simple and sensitive PQ+.Cl –PUF packed column was developed fordetermination and speciation of trace concentrations of bismuth(III & V) species in water by ICP–OES. Thelimits of detection (LOD) and quantification (LOQ) of Bi(III) were found 0.09 and 0.30 mg L 1, respectively. The relative standard deviation (RSD) for 5 replicates of 50 ng L 1 Bi at 2.0 mL min 1 flow was 3.7%. Theproposed column was validated and applied for the preconcentration, separation and subsequentdetermination of analyte in Environmental water reference material (TMDW) and water samples. Theresults were found to be in good agreement with the CRM at the 95% confidence level.
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M.S. El-Shahawi,H. Alwael,A. Arafat,A.A. Al-Sibaai,A.S. Bashammakh,E.A. Al-Harbi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
A fast and selective method for cadmium(II) removal from water by procaine hydrochloride (PQ+ Cl )immobilized polyurethane foam (PUFs) sorbent was developed. The method was based upon formationof [CdI4] 2aq in the test aqueous KI solution and subsequent extraction by PQ+ Cl treated PUFs. Thesorption of Cd2+ ions followed first order equation with an overall rate constant of 0.132 0.033 min 1. The values of DH and DS were 41.54 0.9 kJ mol 1 and 144.58 3.1 J mol 1 K 1, respectively with acorrelation factor of 0.998. The thermodynamic parameters (DH, DS and DG) suggest that the sorption wasspontaneous and exothermic process. The negative value of DS provides indication of moderate sorption of[CdI4]2 ion associate and ordering of the ionic charges without compensatory disordering of the sorbedspecies onto the sorbent. Cadmium(II) sorption is mainly dominated by absorption related to ‘‘solventextraction’’ and an added component for ‘‘surface adsorption’’. PQ+ Cl treated PUFs packed column was alsotested for preconcentration of trace concentrations of cadmium(II) species in various water samples. Theretained Cd species were successfully recovered with dilute HNO3 (1.0 mol L 1) and subsequently analyzedby ICP–OES. Thus, the proposed sorbent packed column provides efficient removal of traces of cadmium(II)ions from water samples. The method could be extended for preconcentrate of trace and ultra trace cadmiumspecies from large samples onto PUF packed column and subsequently analyzed. Indeed, the developedmethod could be satisfactorily applied to the determination of trace Cd ions in natural water.
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M.S. El-Shahawi,A.S. Bashammakh,M.I. Orief,A.A. Al-Sibaai,E.A. Al-Harbi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
The sorption profile of cadmium (II) ions from aqueous iodide media onto procaine hydrochloride(PQ+ㆍCl-) treated polyurethane foams (PUFs) solid sorbent was studied. PQ+ㆍCl- treated PUFs solidsorbent was found suitable and fast for Cd2+ uptake as [CdI4]aq2-. Thus, removal of Cd2+ at trace levels bythe sorbent packed columns was achieved. The sorbed Cd2+ species onto packed column were recoveredwith HNO3 (10.0 mL, 1.0 mol L-1) prior determination by inductively coupled plasma-optical emissionspectrometry (ICP-OES). Plot of Cd2+ ions concentration was linear in the range 0.05–15 mg L-1. Thelimits of detection and quantification of Cd2+ were found 0.01 mg L-1 and 0.033 mg L-1, respectively. Such limits could be improved to lower values by retention of Cd2+ species from large sample volumes ofthe aqueous phase at the optimized conditions. The relative standard deviation of the packed column forthe extraction and recovery of standard aqueous solutions (0.1 L) containing 1.0 and 5.0 mg L-1 (n = 3) ofCd2+ ions at flow rate of 5.0 mL min-1 were 1.98 and 2.9%, respectively. The method was validated byanalysis of Cd in certified reference materials (CRMs) IAEA-Soil-7 and TMDW water and wastewatersamples.
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M.S. El-Shahawi,A. Hamza,A.A. Al-Sibaai,A.S. Bashammakh,H.M. Al-Saidi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
A simple new micelle mediated preconcentration method was developed for analysis of sunset yellow (SY) prior to its spectrophotometric determination. The method was based upon cloud point extraction of the ion associate of SY and trioctylamine (TOA) in HCl–Triton X-100. In the surfactant phase the SY species react with TOA yielding hydrophobic ion associate of SY-+TOA+. The distribution coefficient of SY between surfactant-rich phase and aqueous phase was approximately 104. Validation was tested by comparing the results with standard HPLC. Isotherm and thermodynamic parameters, chemical equilibrium, extraction constants and stiochiometry of the associate were assigned.
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