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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Asian Journal of Green Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Artificial Neural Network,TiO2-graphene/chitosan nanocomposite Photocatalytic activity,anionic dye,Removal Efficiency
- چکیده:
- چکیده انگلیسی: In this work, TiO2-graphene/chitosan nanocomposite with high photocatalytic activity was successfully synthesized and characterized by various analyses such as XRD, TEM, SEM, EDX and DRS. The photocatalytic activity was tested vs. removal of methyl red as ananionic dye under black light radiation. Based on the results, TiO2-graphene/chitosan nanocomposite could effectively remove methyl red, and demonstrate an excellent photocatalytic enhancement over TiO2 and TiO2-graphene samples. The degradation reaction fit well to a Langmuir-Hinshelwood kinetic model implying that the reaction rate is depended on the initial adsorption step. An artificial neural network (ANN) comprising four input variables (TiO2-graphene/chitosan dosage, initial dye concentration, reaction time and temperature of the solution), eight neurons and an output variable (Removal efficiency %) was optimized, tested and validated for methyl red degradation by the prepared TiO2-graphene/chitosan nanocomposite. The results showed that the predicted data from the designed ANN model are in good agreement with the experimental data with a correlation coefficient (R2) of 0.9831. Based on the results, reaction time is the most influential variable and the temperature of solution is the less influential parameter in the removal efficiency of methyl red.
- انتشار مقاله: 10-09-1397
- نویسندگان: Robab Mohammadi,Nasrin Sabourmoghaddam
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Journal of Green Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: TiO2-SiO2/Alginate nanocomposite,Azo dye,Adsorption procedure,Thermodynamic investigation
- چکیده:
- چکیده انگلیسی: In this research work, TiO2-SiO2/alginate nanocomposite with high surface area has been prepared and applied as adsorbent for the removal of azo dye methyl orange from aqueous solutions. Characteristics of phases and crystallite size of TiO2-SiO2/alginate nanocomposite were obtained from XRD and the surface area and pore size distribution were achieved from BET and BJH analysis methods. TiO2-SiO2/alginate nanocomposite with pure anatase phase, the average crystallite size of 8.3 nm, has specific surface area of 188.4 m2/g–1. To find the nature of adsorption procedure, the equilibrium adsorption isotherms were investigated. The linear correlation coefficients of Langmuir, Freundlich and Temkin isotherms were obtained. Based on results, Langmuir isotherm model fitted the experimental data better than the other models. According to the Langmuir isotherm model, the maximum adsorption capacity of TiO2-SiO2/alginate nanocomposite for sequestering methyl orange was about 68.85 mg/ . Furthermore, negative ΔG0 and ΔH0 values obtained through thermodynamic investigation indicated that the adsorption of methyl orange onto TiO2-SiO2/alginate nanocomposite was simultaneous and exothermic in nature, respectively.
- انتشار مقاله: 27-09-1397
- نویسندگان: Robab Mohammadi,Nasrin Sabourmoghaddam
- مشاهده