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RISS 인기검색어
- 검색키워드
- 저자 : B. Barazesh (검색결과 2 건)
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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.
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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.
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