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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Physical Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Isotherm,kinetic,Polypyrrole,SBA-15,Acid blue 62
- چکیده:
- چکیده انگلیسی: In this research, SBA-15/Polypyrrole (SBA-15/PPy) mesoporous nanocomposite was synthesized, characterized and applied for Acid Blue 62 (AB62) adsorption as a textile dye from aqueous solution. In order to evaluate the structural properties of synthesized adsorbent, FT-IR, FESEM and TEM images, XRD, and BET techniques were applied. Some parameters such as pH, dosage, and time which affect the batch adsorption process were investigated and optimized as well. The optimized condition was achieved by 0.3 g/l adsorbent at pH = 2 and 60 min in contact. In addition, Langmuir, Freundlich, Temkin, Dubinin–Radushkevich (D-R) and Redlich–Peterson (R-P) adsorption isotherms were employed to determine type of adsorption isotherm. The results showed the agreement of experimental data with Langmuir adsorption isotherm with maximum dye 1428.571 mg/g adsorption capacity. The kinetic analysis was carried out by pseudo-first-order, pseudo-second-order, intra-particle diffusion and Elovich models. The results revealed that the adsorption kinetic is more similar to the pseudo -second-order. The parameters of thermodynamic like ΔH°, ΔG°, and ΔS° were calculated. The ΔG° and ΔH° negative values and ΔS° positive values (5.155 J/mol K) illustrated that AB62 adsorption process is physi-sorption, spontaneous, exothermic and feasible.
- انتشار مقاله: 07-02-1396
- نویسندگان: Iman Akbartabar,Mohammad Esmail Yazdanshenas,Habib-Allah Tayebi,Navid Nasirizadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Applied Biotechnology Reports
- نوع مقاله: Journal Article
- کلمات کلیدی: Electrochemical sensor,Metronidazole,Molecularly Imprinting,Gold Nanowire
- چکیده:
- چکیده انگلیسی: Introduction: BIn the present study, a selective electrochemical sensor was developed to detect metronidazole (MTZ) through the modification of a screen-printed carbon electrode. Also, molecularly imprinted polyaniline (PANI) film layer/gold nanowire /reduced graphene oxide (GNW/rGO) was used to facilitate the charge transfer process and increase the specific surface area of the sensor.
Materials and Methods: The molecularly imprinted PANI electropolymerization process and MTZ accumulation on the electrode were optimized using the response surface method. The modified screen printed carbon electrode (SPCE) was characterized by scanning electron microscopy and electrochemical impedance spectroscopy (EIS).
Results: The performance of the proposed electrochemical sensor was analyzed, and it proved to have a linear range of 0.03–980.0 nmolL-1 and a detection limit of 0.015 nmolL-1. The selectivity tests of the nanosensor showed its higher specificity for MTZ, as compared to other similar molecules. Furthermore, the developed sensor was successfully applied to detect MTZ in tablets and urine samples with a good recovery percentage.
Conclusions: In comparison with other methods of MTZ detection, the proposed MIP-based electrochemical sensor offers a wider linear response and a lower detection limit.- انتشار مقاله: 08-11-1397
- نویسندگان: Mohammad Dehghani,Navid Nasirizadeh,Mohammad Esmaeel Yazdanshenas
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Applied Biotechnology Reports
- نوع مقاله: Journal Article
- کلمات کلیدی: Textile Wastewater,Decolorization,toxicity,Azo dye,Sonoelectrochemistry
- چکیده:
- چکیده انگلیسی: Introduction: Combined of electrochemistry and ultrasound (sonoelectrochemistry) is one of the advanced oxidation processes (AOPs) for decolorization of color wastewaters. The physicochemical effects of ultrasound improve the electrooxidation of dye solution and decolorization rate.
Materials and Methods: In this study, the decolorization of Reactive Orange 122 (RO122) as an organic pollutant by sonoelectrochemistry has been examined. In this context, the effect of several factors such as hydrogen peroxide concentration, the pH of solution, colour concentration, and the input voltage on decolorization of colourful solution as a single factor were studied. Based on the results, the optimum hydrogen peroxide concentration for removing the colour with the concentration of 10 mgL-1 at 90 minutes was 3.0 mgL-1, with pH about 7.0 and the input potential 1.05 V, the process was carried out without the use of hydrogen peroxide as a discussion parameter at 90 minutes.
Results: The results revealed that decolourization and removal of chemical oxygen demand (COD) of both methods were 99% and 70% in the presence of hydrogen peroxide and 97% and 95.5% in the absence of hydrogen peroxide, respectively.
Conclusions: Microbial toxicity test assessed the toxicity of intermediates produced during these two procedures, the results indicated, in the absence of hydrogen peroxide, Pseudomonas aeruginosa bacteria showed better performance on the colour of sonoelectrochemical treatment solutions compared to the initial colour of the solution, due to absence of toxic materials from the redistribution of RO122 colour.- انتشار مقاله: 11-05-1397
- نویسندگان: Mohammad Amin Radi,Navid Nasirizadeh,Mohammad Mirjalili,Masoud Rohani Moghadam
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Nano Dimension
- نوع مقاله: Journal Article
- کلمات کلیدی: Ethylene glycol,Thermal conductivity,Copper Oxide Nanoparticle,Hybrid Nanofluids,Single-Wall Carbon Nanotube
- چکیده:
- چکیده انگلیسی: The purpose of this study is to use the thermal and electrical conductivities of copper oxide nanoparticles and carbon nanotubes for the preparation of high-performance nanofluids for achieving better heat transfer properties. These nanofluids consist of a water/Ethylene Glycol solution containing single-wall carbon nanotubes (SWCNTs) and copper oxide nanoparticles (CuONPs). The effects of such independent variables as CuONPs and SWCNT concentrations, Ethylene Glycol ratio and solution pH were optimized to enhance the Thermal conductivity by the response surface method. The experimental results revealed that adding small amounts of nanoparticles to water/Ethylene Glycol mixtures would improve the thermal and electrical conductivity of nanofluids. The morphology of the nanoparticles was investigated by Scanning and Transmission Electron Microscopy (SEM and TEM) and Energy-Dispersive X-ray Spectroscopy (EDS). For the first time, the electrical conductivity of nanofluids was investigated by electrical impedance spectroscopy. The combined effects of both nanoparticles and nanotubes on thermal and electrical properties of the base fluid were compared to the influence of each on the same base fluid. The electrical and thermal conductivities could be enhanced by 18000 % and 157 % by addition of 0.41 % wt of SWCNT and 1.15 % wt of CuONPs to a 44:56 Ethylene Glycol-water mixture.
- انتشار مقاله: 14-02-1399
- نویسندگان: Amir Asadikia,Seyed Ali Agha Mirjalily,Navid Nasirizadeh,Hadi Kargarsharifabad
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Nano Dimension
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Adsorption Isotherm,Adsorption kinetic,MCM-41,Acid blue 62
- چکیده:
- چکیده انگلیسی: In this study, removal of Acid blue 62 from aqueous solution by mesoporous silicate MCM-41 modified by Aminopropyltriethoxysilane (APTES) composite was studied. Properties of synthesized composite were analyzed and confirmed by SEM, EDX and FTIR. Results show that Langmuir adsorption isotherm has the best compatibility with the results of experiments. Kinetic analysis using pseudo-first-order model, pseudo-second-order and the intra-particle diffusion model was carried out. Results also confirmed that adsorption process is compatible with the pseudo-second-order kinetic model. Thermodynamic parameters such as Gibbs free energy changes (ΔGo), Enthalpy changes (ΔHo) and Entropy changes (ΔSo) were calculated. Negative value of ΔGo and positive value of ΔHo show that adsorption of Acid blue 62 on aminated nanocomposite is a spontaneous process also endothermic.
- انتشار مقاله: 21-12-1394
- نویسندگان: Ali Torabinejad,Navid Nasirizadeh,Mohammad Esmail Yazdanshenas,Habib Allah Tayebi
- مشاهده