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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,regeneration,RSM,Nano zeolite
- چکیده:
- چکیده انگلیسی: Today, sulfur removal from fuels has improved by new adsorbents such as zeolites that needs extensive studies. This study investigates the feasibility of sulfur compounds adsorption on improved nano zeolite existing in organic fuels and desorption of them from nano-adsorbent.Some properties of improved nano zeolite were analyzed to receive better sulfur compounds adsorption. Zeolite surface structure was analyzed by TEM (tunneling electron microscopy). Batch experiments were chosen for adsorption/desorption study of sulfur compounds and adsorption and desorption conditions were optimized by BBD methodology. The influence of variables in the process, consists of adsorbent metal percent (0.05-10 wt%), adsorbent calcination temperature (200-500 °C) and adsorption process temperature (30-120 °C) in adsorption stage and gas flow rate (1.5-3.5 mL/Min), regeneration temperature (150-300 °C) and desorption time (30-90 Min) which were investigated using experimental design procedure.
- انتشار مقاله: 13-11-1394
- نویسندگان: Ghasem Bakhtiari,Mansour Bazmi,Majid Abdouss,Sayed Javid Royaee
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Cyclic Voltammetry,Wastewater treatment,Electrochemical oxidation,Anodic oxidation,Sulfide pollutant
- چکیده:
- چکیده انگلیسی: In this paper, cyclic voltammetry (CV) was used to study the effects of operating parameters (i.e., sulfide concentration, sodium chloride concentration as supporting electrolyte, temperature, mixing speed, and potential scan rate) on the anodic oxidation of synthetic sulfide-containing wastewaters at the surface of a platinum electrode. The results revealed that anodic oxidation could be used to eliminate sulfide from wastewaters in a wide concentration range, and the oxidation current was an ascending function of the sulfide concentration. The supporting electrolyte concentration had a negligible effect, as the sulfide dissociated in the aqueous media and brought electrical conductivity to the solution. The optimum concentration of electrolyte was found to be 0.05 mol/L. Increasing temperature improved the kinetics of the oxidation reactions and enhanced the electrical conductivity of the solution, which resulted in increasing the anodic oxidation rate. However, at higher temperatures, undesired side reactions were activated which resulted in lowering the power efficiency of the desired anodic oxidation reactions. The optimum operating temperature was found to be 40 – 60 °C. The mixing speed had a periodic effect on the sulfide oxidation. It decreased the diffusion resistance and also the residence time of sulfide at the electrode surface. These phenomena affected the anodic oxidation oppositely and hence, a middle value around 200 rpm was found to be the optimum. By increasing the potential scan rate, the time of performing the reactions in each cycle increased and the overall oxidation progress improved. It was found that mass transfer resistance was a limiting step in the overall reaction. Based on the findings, anodic oxidation has the potential for treating sulfide-containing wastewaters and in the future may be a competitor for conventional treatment processes.
- انتشار مقاله: 05-02-1397
- نویسندگان: Amir Behrouzifar,Soosan Rowshanzamir,Mansour Bazmi
- مشاهده