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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,activated carbon,Perchlorate,Reductive degradation,Ni/Fe bimetallic nanoparticles
- چکیده:
- چکیده انگلیسی: In the present study, nickel and iron (Ni/Fe) bimetallic nanoparticles (Ni-Fe NPs) were produced in the presence of activated carbon (AC) to prepare supported Ni/Fe bimetallic nanoparticles (Ni-Fe NPs/AC). The NPs were modified using cetylpyridinium chloride and used for the simultaneous adsorption and degradation of perchlorate. Synthesized Ni-Fe NPs/AC was characterized using FE-SEM, EDS, and XRD. The influential factors in the removal of perchlorate by Ni-Fe NPs/AC were optimized based on experimental design. According to the results, adsorption and degradation efficiencies were 96.98% and 78.81%, respectively, which could be achieved to the efficiency of nearly 100% by increasing the process time to 110 minutes. Reaction kinetics complied with the pseudo-first-order characteristics. Moreover, the rate constant of adsorption and degradation were estimated at 0.0848 and 0.0199 min-1 at 303 K, and the activation energy for adsorption and degradation was 42.39 and 12.47 kJ/mol, respectively. The proposed method could effectively remove perchlorate from well water and industrial wastewater. Therefore, Ni-Fe NPs/AC could be an effective nanomaterial for the complete degradation of perchlorate. This novel method could also remove persistent organic and inorganic pollutants and promote the industrial application of bimetallic NPs in environmental remediation.
- انتشار مقاله: 14-02-1398
- نویسندگان: Ali Reza Zarei,Ali Moloudi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,activated carbon,Perchlorate,Reductive degradation,Ni/Fe bimetallic nanoparticles
- چکیده:
- چکیده انگلیسی: In the present study, nickel and iron (Ni/Fe) bimetallic nanoparticles (Ni-Fe NPs) were produced in the presence of activated carbon (AC) to prepare supported Ni/Fe bimetallic nanoparticles (Ni-Fe NPs/AC). The NPs were modified using cetylpyridinium chloride and used for the simultaneous adsorption and degradation of perchlorate. Synthesized Ni-Fe NPs/AC was characterized using FE-SEM, EDS, and XRD. The influential factors in the removal of perchlorate by Ni-Fe NPs/AC were optimized based on experimental design. According to the results, adsorption and degradation efficiencies were 96.98% and 78.81%, respectively, which could be achieved to the efficiency of nearly 100% by increasing the process time to 110 minutes. Reaction kinetics complied with the pseudo-first-order characteristics. Moreover, the rate constant of adsorption and degradation were estimated at 0.0848 and 0.0199 min-1 at 303 K, and the activation energy for adsorption and degradation was 42.39 and 12.47 kJ/mol, respectively. The proposed method could effectively remove perchlorate from well water and industrial wastewater. Therefore, Ni-Fe NPs/AC could be an effective nanomaterial for the complete degradation of perchlorate. This novel method could also remove persistent organic and inorganic pollutants and promote the industrial application of bimetallic NPs in environmental remediation.
- انتشار مقاله: 14-02-1398
- نویسندگان: Ali Reza Zarei,Ali Moloudi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Carbon nanotubes,Chemical vapor deposition,Barium ferrite,Microwave absorbing material,Reflection loss
- چکیده:
- چکیده انگلیسی: In this research, at first, Ce-substituted barium ferrite, BaCe0.2Fe11.8O19 was prepared via the sol-gel method as a substrate and then Carbon NanoTubes (CNTs) was synthesized on the surface of the substrate by Chemical Vapor Deposition (CVD) technique. The structure, morphology, and electromagnetic performance of the synthesized nanocomposites were characterized by XRD, FE-SEM, and Vibrating Sample Magnetometer (VSM), respectively. The results indicated that the BaCe0.2Fe11.8O19 particles were coated by CNTs, and the nanocomposite has magnetic properties. Therefore, the electromagnetic properties including complex permittivity (εr), the permeability (µr), and microwave absorption properties were investigated using a vector network analyzer. It was found that in the nanocomposite, because of the presence of CNTs, the Reflection Loss (RL) widely increased. The maximum reflection loss in the frequency range of 8-12 GHz for 2.5 mm thickness was -49.61 dB at 9.0 GHz. The results suggest that prepared nanocomposite can be suitable in the microwave absorbing coatings.
- انتشار مقاله: 19-03-1397
- نویسندگان: Hakimeh Pourabdollahi,Ali Reza Zarei
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Copper chromite,Nano particle,Inverse co-precipitation
- چکیده:
- چکیده انگلیسی: In this study, copper chromite (CuCr2O4) nanoparticles was prepared by inverse co-precipitation method. In this method, cupric nitrate trihydrate, (Cu (NO3)2.3H2O) and chromium nitrate nonahydrate, (Cr (NO3) 3.9H2O) with a mole ratio of 1:2 were used. Characterization of CuCr2O4 nanoparticles was performed by Fourier Transform Infrared Spectroscopy (FT-IR), Raman Spectroscopy, X-ray Diffraction Spectroscopy (XRD), Thermo-Gravimetric/Differential Scanning Calorimetry (TG-DSC), and Field Emission Scanning Electron Microscopy (FE-SEM). The results show that CuCr2O4 crystal can be obtained at temperature 520 °C. Also, phase structure of the CuCr2O4 depends on both Cu:Cr molar ratio and temperature in the starting reactants. Based on this method and under optimum conditions, the temperature for calcination (520 oC), the crystallite size of nanoparticles (18 nm), the spherical structure particles (30 to 70 nm) were obtained.
- انتشار مقاله: 20-06-1393
- نویسندگان: Hassan Tavakoli,Rasoul Sarraf Mamoory,Ali Reza Zarei
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: precipitation,Crystallization,Crystal growth,Barium carbonate,Crystal morphology
- چکیده:
- چکیده انگلیسی: A semi-batch crystallization system is used to determine growth kinetics and morphology of barium carbonate crystals, under a constant pH value and constant temperature in the various relative supersaturations. Results show that crystal growth rate satisfies a first-order kinetic expression at high relative supersaturation, while at relative supersaturation values lower than 3, the kinetic expression is second order. The crystal growth of barium carbonate follows the Burton, Cabera, and Frank mechanism by the kinetic expression G=as2 tanh (b /s). The kinetic parameters obtained from low to high supersaturation ratio by using a numerical methods are a=9.5×10-7 ms-1 and β=1.35×10-2. The investigations show that the pH values and relative supersaturation of solutions have an important role on the crystal morphology of barium carbonate and the forms of observed crystals are floc, candy-like, pillar-like, olivary and olivary with end dendrite with respect to operating condition.
- انتشار مقاله: 30-04-1387
- نویسندگان: Mohammad Reza Khorsand,Mahmood Habibian,Navid Rohani,Ali Reza Zarei
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Journal of Green Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Response surface methodology,Betaine,Cloud pointextraction,Food grade surfactants,Molasses,Freeze drying
- چکیده:
- چکیده انگلیسی: In this study, an experimentally efficient and green-scalable procedure was designed using a sustainable surfactant to extract betaine from the beet waste (molasses) of sugar industry. This procedure was extended based upon the cloud point extraction (CPE) technique. An optimization framework was developed using the response surface methodology (RSM) to achieve an optimal value for the factors affecting the extraction efficiency of the experimental procedure. The main operational factors were surfactant concentrations, electrolyte concentration, pH, and the incubation temperature. Under the measured and optimal conditions, an extraction efficiency of as high as 88% was obtained for the betaine recovery. The polyethylene glycol (PEG) was used as a food grade surfactant that is a renewable substance approved by the U.S. food and drug administration (FDA) used in the food and drink industry. In the last step, the extracted betaine was freeze-dried at -56 °C for 16 h under 0.5 bar ambient pressure. The results revealed that, the final betaine powder product can be directly used as a supplement in livestock feed supply since PEG is an edible surfactant. Thus, the proposed experimental procedure for betaine extraction from molasses is regarded as a scalable, cost-effective, sustainable and eco-friendly approach.
- انتشار مقاله: 10-03-1398
- نویسندگان: Mozhgan Mohammadzadeh,Ali Reza Zarei,Masoud Honarvar,Masoud Mashhadi Akbar Boojar,Hossein Bakhoda
- مشاهده