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RISS 인기검색어
- 검색키워드
- 저자 : Ali Daneshfar (검색결과 4 건)
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Reza S. Razmara,Ali Daneshfar,Reza Sahrai 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
In this research work a simple and very fast salting-out assisted liquid–liquid extraction (SALLE)followed by UV–vis spectrphotometric method was developed and applied for determination of methylene blue and sunset yellow in wastewater and food samples. Water-miscible extraction solvent (4.5 mL acetonitrile) was added to aqueous solution (5.5 mL) for formation of a homogeneous solution. To the mixture solution, suitable amount of (NH4)2SO4 was added, themixture solution was shaken until the salt was dissolved, and then it was separated into two clear phases easily and rapidly. The target analytes in the sample was extracted into the water-miscible extraction solvent. After extraction, the analytes in the organic phase was determined by spectrphotometric method using the analytical wavelengths of 417 nm, 656 nm for sunset yellow and methylene blue, respectively. The influences of effective parameters such as salt (type and amount), water-miscible organic solvent, phase volume ratio,and pH of sample solution were studied and optimized. Under optimized experimental conditions,calibration plots were found to be linear in the range of 0.2–7.0 mg/L, and 0.4–15.0 mg/L for methylene blue and sunset yellow, respectively, with coefficient of determinations more than 0.996. The limits of detection were 0.06 and 0.07 mg/L for methylene blue and sunset yellow, respectively. The limits of quantification were 0.20 mg/L and 0.25 mg/L for methylene blue and sunset yellow, respectively The proposed procedure was successfully applied to the determination of analytes in spiked samples with satisfactory results. The relative recoveries ranged over 90.2–106.0%, with relative standard deviations varying from 1.1% to 3.8%.
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Saeid Khodadoust,Mehrorang Ghaedi,Reza Sahraei,Ali Daneshfar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this study, copper sulfide nanoparticles loaded on activated carbon (CuS-NP-AC) was synthesized by novel, low cost and green approach and characterized using different techniques such as SEM, and BET. This material was used for the removal of sunset yellow (SY) from aqueous solutions was investigated. The dependency of removal percentages to variables such as pH, initial SY concentration, adsorbent dosage and sonication time were studied by central composite design (CCD) coupled with response surface methodology (RSM) by considering the desirability function (DF). The accuracy and ability of method at optimum values predicted by this model was studied by conduction of similar experiments at the same previously optimized conditions. A good agreement between experimental and predicted data was achieved that efficiency of this model for prediction of real optimum point. Among the well known previously isotherm models, the experimental equilibrium data efficiently can be represented by the Langmuir model, while the rate of adsorption. Kinetic data efficiently can be interpreted by combination of pseudo-second order as well as intraparticle diffusion models. The small amount of this adsorbent (0.016 g) is applicable for removal of high amount of SY (>90%) in reasonable time (17 min).
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Shaaker Hajati,Mehrorang Ghaedi,Farahnaz Karimi,Behnaz Barazesh,Reza Sahraei,Ali Daneshfar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
A novel adsorbent (ZnS:Mn nanoparticles loaded on activated carbon) was made. The competitiveadsorption of Direct Yellow 12 (DY12) and Reactive Orange 12 (RO12) dyes in binary mixture onto thisadsorbent was studied. DY12 and RO12 with severe spectra overlapping were chosen and analyzedsimultaneously with high accuracy by first order derivative spectrophotometric method in binarysolutions. The effect of multi-solute systems on the adsorption capacity was investigated. Because of thespecific characteristics of ZnS:Mn-NP-AC was found to be efficient for the removal of the dyes studied. The adsorption capacities were investigated and described by the mono- and multi-componentLangmuir and Freundlich isotherm models for both single and binary dye solutions. The isothermconstants for DY12 and RO12 were calculated. For single solution of DY12 and RO12 dyes, the adsorptioncapacities of the applied adsorbent were found to be 90.05 mg/g and 94.52 mg/g, respectively. Equilibrium uptake amounts of DY12 and RO12 in binary solution onto the applied adsorbent werefound to be considerably decreasing with increasing the concentrations of the other dye. A betteragreement between the adsorption equilibrium data and mono-component Langmuir isotherm modelwas found. However, at concentrations within moderate ranges, the extended Freundlich isothermmodel satisfactorily predicted multi-component adsorption equilibrium data. An endothermic and aspontaneous nature for the adsorption of the dyes studied were shown from thermodynamicparameters.
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Mehrorang Ghaedi,Maryam Ghayedi,Syamak Nasiri Kokhdan,Reza Sahraei,Ali Daneshfar 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
The adsorption of bromophenol red (BPR) onto three adsorbents including palladium, silver and zinc oxide nanoparticles loaded on activated carbon (Pd-NP-AC, Ag-NP-AC and ZnO-NP-AC) in a batch system has been studied and the influence of various parameters has been optimized. The influence of time on removal of BPR on all adsorbent was investigated and experimental data were analyzed by four kinetic models including pseudo first and second-order, Elovich and the intraparticle diffusion equations. Following fitting the experimental data to these models, the respective parameters of each model such as rate constants, equilibrium adsorption capacities and correlation coefficients for each model were investigated and based on well known criterion their applicability was judged. It was seen that the adsorption of BPR onto all adsorbents sufficiently described by the pseudo second-order equation in addition to interparticle diffusion model. The adsorption of BPR on all adsorbent was investigated at various concentration of dye and the experimental equilibrium data were analyzed and fitted to the Langmuir, Freundlich, Tempkin, Dubinin, and Radushkevich equations. A single stage in batch process was efficient and suitable for all adsorbents using the Langmuir isotherm with maximum adsorption of 143 mg gˉ1 for Pd-NP-AC, 250 mg gˉ1 for Ag-NP-AC and 200 mg gˉ1 for ZnO-NR-AC. Thermodynamic parameters such as DG8, DH8, and DS8 for Pd-NP-AC adsorbent were calculated.
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