تعیین شرایط بهینه و سینتیک حذف رنگ‌زای آبی مستقیم 71 از محلول‌های آبی توسط فرایند فتوکاتالیستی نانو ذرات اکسید روی

نوع مقاله : مقاله کوتاه

نویسندگان

دانشگاه تربیت مدرس، تهران

چکیده

در این تحقیق، تخریب فتوکاتالیستی رنگ­زای آبی مستقیم 71 درون یک راکتور دوغابی در حضور نانو ذرات اکسید روی مورد بررسی قرار گرفت و اثر عوامل pH، میزان کاتالیست، غلظت اولیه رنگ زا و شدت لامپ UV بر راندمان حذف تعیین گردید. حذف کامل رنگ‎زا در غلظت mg/L 50 رنگ­زا، 9=pH و در حضور g/L 288/0 کاتالیست تحت شدت لامپ UVC 60 وات پس از گذشت 4 ساعت به دست آمد. راندمان حذف 14/60 درصد COD پس از گذشت 30 ساعت مشاهده شد. بررسی سینتیک واکنش و انجام آزمایش کروماتوگرافی مایع- طیف سنجی جرمی نشان داد که فرایند مورد نظر با ضریب همبستگی 987/0 از مدل مرتبه دوم تبعیت می­کند و ترکیبات پیچیده موجود در محلول شکسته می­شوند.

کلیدواژه‌ها


  1. منابع
  2. Zohra B, Aicha K, Fatima S, Nourredine B, Zoubir D. Adsorption of direct red 2 on bentonite modified by etyl trimethyl ammonium bromide. Chemical Engineering Journal; 2008; 136 (2-3): 295-305.
  3. Kabra K, Chaudhary R, Sawhney RL. Treatment of hazardous organic and inorganic compounds through aqueous-phase photocatalysis: A Review; Industrial & Engineering Chemistry Research; 2004; 43 (24): 7683-7696.
  4. Shu HY, Chang MC, Chen CC, Chen PE. Using resin supported nano zero-valent iron particles for decoloration of Acid Blue 113 azo dye solution. Journal of Hazardous Materials; 2010; 184 (1-3): 499-505.
  5. Joshi KM, Shrivastava VS. Removal of hazardous textile dyes from aqueous solution by using commercial activated carbon with TiO2 and ZnO as photocatalyst. International Journal of ChemTech Research; 2010, 2 (1): 427-435.
  6. Velmurugan R, Swaminathan M. An efficient nano-structured ZnO for dye sensitized degradation of reactive red 120 dye under solar light. Solar Energy Materials & Solar Cells; 2011; 95 (3): 942-950.
  7. Yassıtepea E, Yatmazb HC, Ozturk C, Ozturk K, Duran C. Photocatalytic efficiency of ZnO plates in degradation of azo dye solutions. Journal of Photochemistry and Photobiology; 2008; 198 (1): 1-6.
  8. Daneshvar N, Salari D, Habib A. Orange removal from pollutant water by use of coagulation- flocculation and Fenton oxidation. Fifth National Congress of the Fourth International Congress of Iranian Chemical Engineering; 2000. [In Persian].
  9. Talat Mehrabad J, Ziaifar N, Arjomandirad F. UV –Induced removal of acid red 18 in water on ZnO as an alternative catalyst to TiO2. Journal of Basic and Applied Scientific Research; 2011; 1 (12): 3393-3397.
  10. Ministry of Commerce, Department of Statistics, Business Planning Office, Import Reports; 2013; 95.
  11. Tabatabaee M, Roozbeh M, Roozbeh M. Catalytic effect of lucunary hetero-poly-anion containing molybdenum and tungsten atoms on decolorization of direct blue 71. Chinese Chemical Letters; 2011; 22 (12): 1501-1504.
  12. Habibi MH, Mikhak M. Titania/zinc oxide nano composite coatings on glass or quartz substrate for photocatalytic degradation of direct blue 71. Applied Surface Science; 2012; 258 (18): 6745-6752.
  13. Tunc S, Gurkana T, Duman O. On-line spectrophotometric method for the determination of optimum operation parameters on the decolorization of acid red 66 and direct blue 71 from aqueous solution by Fenton process. Chemical Engineering Journal; 2012; 181-182 (Feb.): 431-442.
  14. Saien J, Soleymani A. Degradation and mineralization of direct blue 71 in a circulating upflow reactor by UV/TiO2 process and employing a new method in kinetic study. Journal of Hazardous Materials; 2007; 144 (1-2): 506-512.
  15. Delnavaz M, Ayati B, Ganjidoust H. Comparison between epoxy and waterproof sealers in TiO2 immobilization on concrete surface for treating phenolic wastewater by photocatalytic process. Journal of Water and Wastewater; 2011; 2: 17-28. [In Persian].
  16. Damodar RA, You SJ. Performance of an integrated membrane photocatalytic reactor for the removal of reactive black 5. Separation and Purification Technology; 2010; 71 (1): 44-49.
  17. Greenberg AE, Eaton AD, Mary Ann and Franson H. Standard Methods for the Examination of Water & Wastewater, Washington DC, USA: APHA, AWWA, WPCF; 2005.
  18. Zhang R, Pan J, Briggs P, Thrash M, Kerr L. Studies on the adsorption of RuN3 dye on sheet-like nano-structured porous ZnO films. Solar Energy Materials & Solar Cells; 2008; 92 (4): 425- 431.
  19. Muthirulan P, Meenakshisundararam M, Kannan N. Beneficial role of ZnO photocatalyst supported with porous activated carbon for the mineralization of alizarin cyanin green dye in aqueous solution. Journal of Advanced Research; 2013; 4 (6):479- 484.
  20. Saravanan R, Karthikeyan N, Gupta VK, Thirumal E, Thangadurai P, Narayanan V, Stephen A. ZnO/Ag nanocomposite: An efficient catalyst for degradation studies of textile effluents under visible light. Materials Science and Engineering; 2013; 33 (4): 2235-2244.
  21. Kim J, Lee S, Pyun J. Characterization of photocatalytic activity of TiO2 nanowire synthesized from Ti-plate by wet corrosion process. Current Applied Physics; 2009; 9 (4): 252-255.
  22. Fatimah I, Wang S, Wulandari D. ZnO/ montmorillonite for photocatalytic and photochemical degradation of methylene blue. Applied Clay Science; 2011; 53 (14): 553-560.
  23. Chiou CH, Wu CY, Juang RS. Influence of operating parameters on photocatalytic degradation of phenol in UV/TiO2 process. Chemical Engineering Journal; 2008; 139 (2): 322-329.
  24. Byrappa K, Subramani AK, Ananda S, Lokanatharai K M, Dinesh R, Yoshimura M. Photocatalytic degradation of rhodamine B dye using hydrothermally synthesized ZnO. Indian Academy of Sciences; 2006; 29 (5): 433-438.
  25. Ghodsian M, Ayati B, Ganjidoust H. Determination of optimum amounts of effective parameters in reactive dyes removal using photocatalytic reactions by immobilized TiO2 nano particles on concrete surface. Journal of Water and Wastewater; 2012; 24 (3): 45-53. [In Persian].
  26. Panbekar M. Compare oxidizing effect on the photocatalytic UV/TiO2 in removal of dye. M.Sc.: Civil and Environmental Engineering, Tarbiat Modares University, Iran: 2012. pp. 92-95. [In Persian].