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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: photocatalyst,Phenol degradation,Fe/TiO2,Fe- loading
- چکیده:
- چکیده انگلیسی: In this research work, iron modified titanium dioxide photocatalyst was synthesized by the sol-gel method. The catalyst is characterized by FT-IR, XRF, and TGA techniques. Since the activity of Fe/TiO2 is highly affected by the loading of Fe, our major purpose of this work was focused on the role of this factor. Moreover, the effect of calcination temperature, which was also of high importance, was studied in this work. FT-IR results indicated the existence of a peak in the range of 1100-1200corresponding to Ti-O-Fe bonds. The intensity of this peak is proportional to the amount of iron, which is incorporated into the TiO2 lattice. Optimum Fe-loading was specified by FT-IR and it was measured by XRF. In order to evaluate the catalytic activity of Fe/TiO2, a synthetic wastewater of phenol was irradiated by the UV lamp (757.38 mW/cm3), Fe/TiO2 with the dosage of 0.5 g/L was applied as the catalyst and H2O2 (12.5 mL, 30% wt. /wt.) was added as an oxidizing agent.Experimental results proved, the optimum condition for phenol degradation process over Fe/TiO2 is as follows: Fe loading in the TiO2 lattice: Fe2O3/TiO2 is 0.27%, calcination temperature: 600°C, and irradiation time of 600 min. Under this circumstance, 98.26% of the phenol in water was decomposed.
- انتشار مقاله: 04-04-1394
- نویسندگان: Somayeh Sohrabi,Faranak Akhlaghian
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Engineering, Transactions A: Basics
- نوع مقاله: Journal Article
- کلمات کلیدی: Photocatalysis,sol,NanoStructured,Fe,Titania,Phenol degradation,gel
- چکیده:
- چکیده انگلیسی: In this work, Fe/TiO2 nanostructured catalyst was prepared using sol-gel method developed by Yoldas and tested in degradation of phenol in water under UV radiation. The synthesized catalyst was characterized by XRF, XRD, specific surface area and porosimetry, and SEM methods. The porosimetry revealed the mesopore structure of the catalyst. Results of SEM confirmed the nano dispersion of iron oxides on titania support. Effects of Fe load of the catalyst, dosage of the catalyst, pH, H2O2 amount, and time were investigated. Results of phenol photodegradation over Fe/TiO2 showed that the reaction followed an apparent first order kinetics at low phenol concentration and the apparent rate constant was 0.0017 min-1. Also, there was an optimum for Fe load of the catalyst.
- انتشار مقاله: 11-10-1348
- نویسندگان: Somayrh Sohrabi,Faranak Akhlaghian
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Arsenate,Fe2O3/Al2O3,Immobilization,Water treatment
- چکیده:
- چکیده انگلیسی: The presence of arsenate in drinking water causes adverse health effects including skin lesions, diabetes, cancer, damage to the nervous system, and cardiovascular diseases. Therefore, the removal of As (V) from water is necessary. In this work, nanostructured adsorbent Fe2O3/Al2O3 was synthesized via the sol-gel method and applied to remove arsenate from polluted waters. First, the Fe2O3 load of the adsorbent was optimized. The Fe2O3/Al2O3 adsorbent was characterized by means of XRF, XRD, ASAP, and SEM techniques. The effects of the operating conditions of the batch process of As (V) adsorption such as pH, adsorbent dose, contact time, and initial concentration of As (V) solution were studied, and optimized. The thermodynamic study of the process showed that arsenate adsorption was endothermic. The kinetic model corresponded to the pseudo-second-order model. The Langmuir adsorption isotherm was better fitted to the experimental data. The Fe2O3/Al2O3 adsorbent was immobilized on leca granules and applied for As (V) adsorption. The results showed that the immobilization of Fe2O3/Al2O3 on leca particles improved the As (V) removal efficiency.
- انتشار مقاله: 19-11-1395
- نویسندگان: Faranak Akhlaghian,Bubak Souri,Zahra Mohamadi
- مشاهده