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RISS 인기검색어
- 검색키워드
- 저자 : Abbas Jamali (검색결과 4 건)
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Abbas Jamali,Farzaneh Shemirani,Ali Morsali 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
The adsorptive removal of hazardous materials of organophosphorus insecticides by adsorbents withhigh adsorption capacities is highly desirable. In this work, we present the removal of two representativeorganophosphorus insecticides, Dichlorvos and Metrifonate by two exceptionally stable Zr-based MOFsof UIO-66 and UIO-67. The MOFs were characterized by TGA, FTIR, SEM, XRD, BET and XPS analyses. Effectof some parameters such as adsorbent dose, contact time, pH and ionic strength on the removal efficiencyof Dichlorvos and Metrifonate were investigated. The mechanism of interaction was carefullyinvestigated by XPS and FTIR. The isotherm and kinetic data were accurately described by the Langmuirand pseudo-second-order models. The adsorption capacities in UIO-67 approached as high as571.43 mg g 1 for Dichlorvos and 378.78 mg g 1 for Metrifonate, which were much higher than UIO-66. Compared to other works this work has shown better adsorption capacity and cost efficient. Thecalculated removals for the samples are in the range from 97.8 to 99%, indicating that the UIO-67 can beapplied for removal of Dichlorvos and Metrifonate in real samples.
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Cadmium removal from aqueous solution by brown seaweed, Sargassum angustifolium
Seyed Ali Jafari,Abbas Jamali,Asma Hosseini 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
Four kinds of indigenous seaweed were employed for assessing their soluble cadmium biosorption performance. Sargassum angustifolium revealed the greatest capacity in the range of equilibrium cadmium concentration lower than 0.5mmol l−1. It was further examined by optimization, equilibrium, kinetic and thermodynamic studies. It was found that1 g l−1 biosorbent at initial pH of 6 and 38 oC revealed the highest Cd2+ uptake. Kinetic studies revealed that the Cd2+ biosorption included a two-stage mechanism with an initial rapid stage during the first 30 min where ion exchange was the dominant mechanism. The process gradually reached equilibrium after 40-50 min of contact where the metal adsorption occurred too low due to the intraparticle diffusion. However, it was not the sole rate-limiting step. The pseudo-second order kinetic model, unlike the pseudo-first order, excellently described the experimental data in the whole range of contact time. The Langmuir isotherm model was more successful in describing the equilibrium data than the Freundlich and D-R models. Using this isotherm model, a relationship was proposed to predict the dose of biosorbent needed for removing specific initial cadmium concentration from aqueous solution or to meet a desire equilibrium cadmium concentration. The spontaneity and endothermicity as well as increasing randomness at the solid/solution interface during the biosorption were revealed by means of the thermodynamic studies.
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Seyed Ali Jafari,Abbas Jamali 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
Packed-bed column process efficiency for cadmium adsorption from aqueous solution was investigated under different bed heights (2.6 to 7.5 cm) and feed flow rates (15 to 30 ml min−1). The column was filled with brown seaweed, Sargassum angustifolium. Three simplified models, including Bed Depth Service Time, Thomas, and Yoon- Nelson were employed for describing the experimental breakthrough curves as well as achieving design parameters. Bed lifetime was also evaluated in several consecutive sorption-desorption cycles. Cadmium concentration of 0.005mg l−1, as a standard limit for potable water, was considered as the breakthrough concentration. The maximum column performance was achieved 81% at 7.5 cm bed length and flow rate of 15 ml min−1. Indeed, increasing the bed height increased the sorption performance and service time, while increasing the feed flow rate had a negative effect. Maximum sorption capacity value remained almost constant by the bed height changes; however, increase in the feed flow rate slightly decreased it. The modeling results revealed that the Yoon-Nelson model was more accurate than Thomas for describing the experimental breakthrough data, especially at low flow rates. Column service time predictions were surprisingly achieved using the Bed Depth Service Time model even at extrapolations. 20% reduction in column adsorption efficiency was observed at the end of four consecutive sorption-desorption cycles; however, desorption efficiencies were achieved more than 99% in each cycle.
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Mostafa Hossein Beyki,Mohammad Hadi Ghasemi,Abbas Jamali,Farzaneh Shemirani 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Polylysine–resorcinol coated alumina nanotube has been synthesized based on Mannich reaction. Synthetic polymer has been obtained using lysine and resorcinol as monomer and p-formaldehyde aslinker by condensation reaction. The nanosorbent was employed for cadmium adsorption from aqueoussamples. Effective parameters on sorption process have been optimized with Box–Behnken design (BBD). Equilibrium time was 11 min as well as adsorption capacity was 220 mg g 1. Regeneration of the sorbentwas performed with HNO3 solution (0.5 mol L 1). The accuracy of the method was evaluated bydetermination of cadmium in various real samples.
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