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RISS 인기검색어
- 검색키워드
- 저자 : Gabriela Ciobanu (검색결과 3 건)
- 무료
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Acid Black 172 dye adsorption from aqueous solution by hydroxyapatite as low-cost adsorbent
Gabriela Ciobanu,Maria Harja,Lacramioara Rusu,Anca Mihaela Mocanu,Constantin Luca 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
The Acid Black 172 dye adsorption on the uncalcined hydroxyapatite nanopowder was investigated. Thehydroxyapatite prepared by wet coprecipitation method has high specific surface area of 325 m2/g and crystal sizessmaller than 70 nm. The batch adsorption experiments revealed that under the optimum adsorption conditions (pH 3,hydroxyapatite dosage 2 g/L, initial dye concentration 400 mg/L and temperature 20 oC) the dye removal efficiencywas 95.78% after 1 h of adsorption. The adsorption kinetics was best described by the pseudo-second order kineticmodel. The intraparticle diffusion model shows that intraparticle diffusion is not the sole rate-limiting step; the masstransfer also influences the adsorption process in its initial period. The Langmuir isotherm model best represented theequilibrium experimental data, and the maximum adsorption capacity (qm) was 312.5 mg/g.
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Removal of cadmium(II) from aqueous solution by adsorption onto modified algae and ash
Maria Harja,Gabriela Buema,Laura Bulgariu,Dumitru Bulgariu,Daniel-Mircea Sutiman,Gabriela Ciobanu 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.9
Pollution with cadmium ions has serious negative consequences on human health and environment. Adsorption of low-cost materials represents a viable option for the removal of cadmium ions from aqueous media. In this study are comparatively discussed the adsorption behaviour of cadmium(II) on two low-cost materials, one of biologic nature (marine algae) and other of inorganic nature (ash), after their treatment with alkaline solution. The influence of contact time and initial cadmium ions concentration was studied in batch system, for each type of adsorbent. In optimum experimental conditions (solution pH of 5.0; adsorbent dose of 8 g L−1) and an initial cadmium concentration of 360mg L−1, the obtained uptake capacities reach to 34.15mg g−1 for the modified algae and to 43.12mg g−1 for the modified ash, respectively. The uptake data were analyzed using two isotherm models (Langmuir and Freundlich) and the models’ parameters were evaluated. The results indicate that t heLangmuir model provides the best correlation of experimental data for both adsorbents, and the maximum adsorption capacities were 41.8mg g−1 for modified algae and 48.0 mg g−1 for modified ash, respectively. The kinetics of the cadmium uptake was modelled using the pseudofirst order, pseudo-second order and intra-particle diffusion model equations. It was shown that the pseudo-second order kinetic equation could best describe the adsorption kinetics of cadmium ions, whatever the nature of adsorbent.
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Removal of Astrazone Blue from aqueous solutions onto brown peat. Equilibrium and kinetics studies
Lacramioara Rusu,Maria Harja,Andrei Ionu Simion,Daniela Suteu,Gabriela Ciobanu,Lidia Favier 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
The aim of this study is to characterize and assess the sorption potential of brown peat, in relation to coloredpollutants from the textile industry wastewater. The objectives of this paper were: the physicochemical, morphological,and mineralogical characterization of brown peat, testing the adsorption capacity of natural and chemically treatedpeat samples for Astrazone Blue, evaluation of adsorption process from equilibrium isotherm and kinetic point of view. The characteristics of the peat samples were investigated using elemental analysis, scanning electron microscopy andX-ray diffractometry. Experimental data indicated that the brown peat tested confirm a high level of adsorption (removalefficiency >93.00%, adsorption capacity reaching up to 24.27 mg/g) of Astrazone Blue from aqueous solution. TheLangmuir and Freundlich adsorption isotherm models were used to find the best equation able to describe the adsorptionprocess. Experimental adsorption data were successfully described by the Langmuir equilibrium isotherm model. This fact is supported by the agreement between the q values obtained using the Langmuir equation (26.32 mg/g), andthe ones obtained experimentally (24.27 mg/g). The kinetic studies showed that the pseudo-second-order model describedAstrazone Blue sorption kinetics, as confirmed by the high values of R2, which are over 0.99 for the wholeinvestigated concentration range (200 to 800 mg/L). The use of brown peat adsorbent is more advantageous comparedwith other materials since it does not require a preliminary treatment, is low-cost and is an eco-friendly adsorbent. Hence,this peat appears to be a viable material for the decontamination of effluents containing dyes.
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