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Silver nanoparticle-based spectrophotometric method for quantification of nile blue A in river water
S.S. Mortazavi,R. Sahraei,A. Farmany 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A novel and sensitive spectrophotometric method is developed for the determination of nanomolar level of nile blue A in water samples based on its catalytic effect of silver nanoparticles on the oxidation of nile blue A by hexacyanoferrate (III) in acetate-acetic acid medium and at 25 ℃. The absorbance is measured at 595.5 nm with the fixed-time method. The optimization of the operating conditions regarding concentration of the reagents, temperature and interferences is also investigated. The calibration curve is linear over the concentration range between 85 and 2000 nM of nile blue A with good precision and accuracy. The detection limit of the method is down to 54. The relative standard deviation for a standard solution of 100.0 nM of nile blue A is 1.63% (n = 10). The proposed method provides a highly sensitive, selective and relatively rapid assay for nile blue A at nanomolar level without any pre-concentration and separation step. The method was applied to the determination of nile blue A in river water samples.
M. Ghaedi,A. Golestani Nasab,S. Khodadoust,R. Sahraei,A. Daneshfar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
In this research, zinc oxide nanoparticles loaded on activated carbon (ZnO-NRs-AC) synthesized in thepresence of ultrasonic power and efficiently applied for removal of methylene blue (MB) fromwastewater. Optimization of variables such as pH, concentration of MB, amount of ZnO-NRs-AC, contacttime and temperature make permits to achieve maximum removal percentages in mild condition. Subsequently, the experimental equilibrium data at different concentration ofMB and various amount ofadsorbentmass was fitted to conventional isothermmodels like Langmuir, Freundlich and Tempkin andit was revealed that the Langmuir is best model for explanation of behavior of experimental data. Following the effect of contact time on the adsorption rate was estimated and observed thatexperimental data can be represented by second order and interparticle diffusion model. The obtainednegative value of Gibbs’s free energy and positive value of adsorption enthalpy show the spontaneousnature and endothermic nature of adsorption process.
M. Roosta,M. Ghaedi,A. Daneshfar,R. Sahraei,A. Asghari 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
A novel ultrasound assisted adsorption protocol for the removal of erythrosine from aqueous solution bytin sulfide nanoparticle loaded on activated carbon (SnS-NP-AC) has been described. The main andinteraction of variables (pH, sonication time, adsorbent dosage and initial dyes concentrations) on theremoval of erythrosine were studied and optimized by a central composite design (CCD) combined withresponse surface methodology (RSM). The small amount of proposed adsorbent (0.02 g) is applicable forremoval of high content of erythrosine with high removal percentage (>98%) in short time (4.5 min). Application of ultrasound led to remarkable decrease in adsorption time.
M. Ghaedi,N. Taghavimoghadam,S. Naderi,R. Sahraei,A. Daneshfar 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
In this research Zn(OH)2 nanoparticles loaded on activated carbon (Zn(OH)2-NPs-AC) as novel adsorbent and raw multiwalled carbon nanotube (MWCNT) were applied for efficient removal of bromothymol blue (BTB). Both adsorbent has been characterized with different techniques such and SEM, XRD and UV–vis spectrometry. Their size was less than 100 nm. In the removal process the variables are pH,temperature, concentration of BTB, amount of adsorbent and contact time that their influence on removal of BTB was optimized using one at a time approach in batch procedure. Adsorptions of BTB on bath adsorbent depend highly on pH. Following the investigation of temperature effect, the thermodynamic parameters including change in entropy, enthalpy and free Gibbs energy were calculated. For both adsorbents, positive value of enthalpy and negative value of DG0 show routine feasibility of adsorption using energy. At optimum value of variables, the removal processes onto both adsorbent have high adsorption capacity for best fitting model Langmuir, i.e. for Zn(OH)2-NP-AC and 150 mg/g for PAC. The adsorption rates were well explained with pseudo second order and interparticle diffusion model. It is expected that there could an increase in the number of reactive sites due to their expected high volume, pore size and high surface area.
M. Ghaedi,F. Karimi,B. Barazesh,R. Sahraei,A. Daneshfar 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
In the present study, tin sulfide nanoparticle loaded on activated carbon simply was synthesized and characterized using different techniques such as SEM, XRD and UV-analysis. Then, this new efficient adsorbent was used for Reactive Orange 12 (RO-12) adsorption. To improve the efficiency of adsorption effect of variables viz. pH, mass of SnS-NP-AC, initial dye concentration, contact time and temperature were examined and optimized. The adsorption mechanism and rate of processes was investigated by analyzing time dependency data to various conventional kinetic models such as pseudo-first-order and second order, Elovich and intra-particle diffusion models. Among them it was found that adsorption followed the pseudo-second-order kinetic model with good agreement between the equilibrium experimental and expected adsorption data. High fitting with the Langmuir models shows heterogeneous surface and mono-layer nature adsorption of Reactive Orange 12 on the SnS-NP-AC. Thermodynamic parameters such as enthalpy (DH), entropy (DS), activation energy (Ea), of sticking probability (S*) and Gibb’s free energy changes (DG) were also calculated. It was seen that the proposed adsorbent has high tendency and adsorption capacity for RO-12 adsorption in a feasible, spontaneous and endothermic fashion.
S. Hajati,M. Ghaedi,B. Barazesh,F. Karimi,R. Sahraei,A. Daneshfar,A. Asghari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Because of technological importance of simultaneous analysis and removal of dyes in their mixtures, we studied the competitive adsorption of brilliant green (BG) and methylene blue (MB) dyes onto Ruthenium nanoparticles on activated carbon (Ru/C). Due to overlap between the spectra of the dyes, it was needed to apply a suitable method to resolve this overlap. Recently, first derivative method was successfully used to study binary solutions. However, it was failed to apply for the binary solution of BG and MB. Therefore, we successfully applied high order derivative spectrophotometry for resolving the spectra overlap between BG and MB and for the simultaneous determination of them in their mixture. The presence of multi-solute pollutants in most industrial wastewater necessitates investigating the effect of multi-solute systems on adsorption capacity. The optimal pH at which the adsorption capacity is maximum, was found to be close to the pH of natural aqueous solutions that is an advantage. A low dosage (0.015 g) of the prepared carbon-supported Ru nanoparticles (Ru/C) with high surface area (1266 m2/g according BET) was efficiently used for the dyes removal at pH 6.0 (close to the pH of natural aqueous solutions) and at room temperature that is an advantage of Ru/C. Isotherm constants were obtained for BG and MB after modeling experimental data by using different isotherms. A better consistency to Freundlich isotherm model was found. Thermodynamic parameters showed an endothermic and a spontaneous nature for the adsorption of the dyes.
M. Ghaedi,A.M. Ghaedi,F. Abdi,M. Roosta,R. Sahraei,A. Daneshfar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
In this study a green approach described for the synthesis of copper sulfide nanoparticles loaded onactivated carbon (CuS-NP-AC) and usability of it for the removal of reactive orange 12 (RO-12). Thismaterial was characterized using instruments such as scanning electron microscopy (SEM) and X-raydiffraction (XRD). The effects of variables were optimized using Principal component analysis-artificialneural network (PCA-ANN). Fitting the experimental equilibrium data shows the suitability of theLangmuir isotherm. The small amount of proposed adsorbent (0.017 g) is applicable for successfulremoval of RO-12 (RE > 95%) in short time (31.09 min) with high adsorption capacity (96.9 mg g-1)