کاربرد فرایند فتوکاتالیستی UV/NiO در حذف رنگزای پلی‌آزوی مستقیم

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی زنجان، زنجان

2 کارشناس ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی زنجان

3 استاد گروه مهندسی بهداشت محیط، دانشگاه علوم پزشکی تهران، تهران

4 مربی گروه مهندسی بهداشت محیط، دانشگاه علوم پزشکی زنجان، زنجان

5 کارشناس ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی اصفهان، اصفهان

چکیده

در این مطالعه کارایی سیستم UV/NiO به‌عنوان یکی از فرایند‌های اکسیداسیون پیشرفته برای حذف رنگ پلی‌آزوی قرمز مورد بررسی ‌قرار گرفت. این تحقیق به‌صورت پایلوت در مقیاس آزمایشگاهی و به‌طور ناپیوسته راهبری‌گردید. پرتو فرابنفش مورد استفاده در این تحقیق توسط لامپ UV کم فشار W11 تأمین شد. تأثیر عوامل مختلف از جمله pH, زمان‌های تابش مختلف، غلظتهای مختلف اکسید نیکل و غلظتهای اولیه رنگ بررسی ‌گردیدند. نتایج آزمایش با سیستم UV/NiO نشان داد که UV به تنهایی قادر به حذف رنگ DR 80 نیست. اکسید نیکل یک کاتالیست مؤثر در حذف رنگ توسط فرایند نانوفتوکاتالیستی است. با کاهش pH ، کارایی حذف رنگ افزایش می‌یابد و pH بهینه برابر 4 است. در نهایت بالاترین کارایی حذف برای رنگ DR 80 با غلظت 25 و 50 میلی‌گرم در لیتر به‌ترتیب برابر 94/29 و 82/22 درصد توسط فرایند UV/NiO حاصل گردید. فرایند رنگبری توسط فرایند UV/NiO از سنتیک واکنش درجه دوم کاذب تبعیت می‌کند. به‌طور کلی فرایند UV/NiO روش‌ مؤثری در حذف رنگ پلی‌آزو DR 80 از محلولهای آبی است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Direct Poly Azo Dye Decolorization Using Nanophotocatalytic UV/NiO Process

نویسندگان [English]

  • Ali Asadi 1
  • Roya Nateghi 2
  • Simin Nasseri 3
  • Mehran Mohammadiyan 1
  • Hamed Mohammadi 4
  • Gholamreza Bonyadinejad 5
1 Assist. Prof. of Environmental Health Eng., Faculty of Public Health, Zanjan University of Medical Sciences, Zanjan
2 M.Sc. of Environmental Health Eng., Faculty of Public Health, Zanjan University of Medical Sciences,
3 Prof. of Environmental Health Eng., Tehran University of Medical Sciences, Tehran
4 Instructor of Environmental Health Eng., Zanjan University of Medical Sciences, Zanjan
5 M.Sc. of Environmental Eng., Faculty of Public Health, Isfahan University of Medical Sciences, Isfahan
چکیده [English]

In this study, efficiency of UV/NiO system as a forms of Advanced Oxidation Processes (AOP) to remove red poly azo was investigated. This study was conducted as a pilot scale and batch mode. Ultraviolet was achieved by 11 W low pressure lamp. Effects of various factors such as pH, different times of irradiation, different concentration of nickel oxide, primary concentration of colors were evaluated. The test results of UV/NiO system showed that no effects were observed with UV alone in photocatalysis process for removal of dye DR 80. Nickel oxide is an effective catalyst in removal of dye by the nanophotocatalytic process. The results represent that the color removal efficiency increase with pH reduction and optimum pH was found 4. Fainally, the highest removal efficiency for DR 80 dye with concenteration of 25 mg/L and 50 mg/L was obtained about 94.29% and 82.22% by the process of UV/NiO respectively. Reaction kinetic in the UV/NiO process follows pseudo secondry-order reactions. Totally UV/NiO process is an effective methode for DR 80 poly azo dye removal in aqueous solutions.

کلیدواژه‌ها [English]

  • Poly Azo Dye
  • Nanophotocatalitic Process
  • Nickel Oxide Nanopowder
  • Decolorization
1- Somasiri, W., Li, X. F., Ruan, W. Q., and Jian, C. (2008). “Evaluation of the efficacy of upflow anaerobic sludge blanket reactor in removal of colour and reduction of COD in real textile wastewater.” Bioresource Technology, 99, 3692-3699.
2- Movahedian Attar, H., and Rezaee, R. (2006). “Investigating the efficiency of advanced photochemical oxidation (APO) technology in degradation of direct azo dye by UV/H2O2 process.” J. of Water and Wastewater, 59, 75-83. (In Persian)
3- Daneshvar, N., Aber, S., Vatanpour, V., and Rasoulifard, M. H. (2008). “Electro-fenton treatment of dye solution containing orange II, Influence of operational parameters.” J. of Electroanalytical Chemistry., 615, 165-174.
4- Peng, Y., Fu, D., Liu, R., Zhang, F., and Liang, X. (2008). “NaNO2/FeCl3 catalyzed wet oxidation of the azo dye acid orange 7.” Chemosphere, 71, 990-997.
5- Joshi, T., Iyengar, L., Singh, K., and Garg, S. (2008). “Isolation, identification and application of novel bacterial consortium TJ-1 for the decolourization of structurally different azo dyes.” Bioresource Technology, 99, 7115-7121.
6- Lopes, A., Martins, S., Morao, A., Magrinho, M., and Goncalves, I. (2004). “Degradation of a textile dye C. I. direct red 80 by electrochemical processes.” Portugaliae Electrochimica Acta., 22, 279-294 . 
7- Tauber, M. M., Gubitz, G. M., and Rehorek, A. (2008). “Degradation of azo dyes by oxidative processes – Laccase and ultrasound treatment.” Bioresource Technology, 99, 4213-4220.
8- Zhang, G., Yang, F., and Liu, L. (2009). “Comparative study of Fe2+/H2O2 and Fe3+/H2O2 electro-oxidation systems in the degradation of amaranth using anthraquinone/polypyrrole composite film modified graphite cathode.” J. of Electroanalytical Chemistry, 632, 154-161.
9- Chen, Y. P., Liu, S. Y., Yu, H. Q., Yin, H., and Li., Q.R. (2008). “Radiation-induced degradation of methyl orange in aqueous solutions.” Chemosphere, 72, 532-536.
10- Wang, J., Sun, W., Zhang, Z., Jiang, Z., Wang, X., Xu, R., Li, R., and Zhang, X. (2008). “Preparation of Fe-doped mixed crystal TiO2 catalyst and investigation of its sonocatalytic activity during degradation of azo fuchsine under ultrasonic irradiation.” J. of Colloid and Interface Science, 320, 202-209.
11- Schutte, C. F., and Focke, W. (2007). Evaluation of nanotechnology for application in water and wastewater treatment and related aspects in south Africa, Report Number KV 195/07.
12- Lai, T. L., Wang, W. F., Shu, Y. Y., Liu, Y. T., and Wang, C. B. (2007). “Evaluation of microwave-enhanced catalytic degradation of 4-chlorophenol over nickel oxides.” J. of Molecular Catalysis A, Chemi., 273, 303-309.
13- Wang, H. Ch., Chang, S. H., Hung, P. Ch., Hwang, J. F., and Chang, M. B. (2008). “Catalytic oxidation of gaseous PCDD/Fs with ozone over iron oxide catalysts.” Chemosphere, 71, 388-397.
14- EPA. (1997). Sector notebook project, Textile Industry, USA.
15- Ghanbarian, R., Mahvi, A. H., Nabizadeh, R., and Saeedniya, S. (2008). “A pilot study of RO16 discoloration and mineralization in textile effluents using the nanophotocatalytic process.” J. of Water and Wastewater, 69, 45-51. (In Persian)
16- Mahmoodi, N. M., Arami, M., Yousefi Limaee, N., and Salman Tabrizi, N. (2005). “Decolorization and aromatic ring degradation kinetics of direct red 80 by UV oxidation in the presence of hydrogen peroxide utilizing TiO2 as a photo catalyst.” J. Chem. Eng., 112, 191-196.
17- Song, Z., Chen, L., Hu, J., and Richards, R. (2009). “NiO(111) nanosheets as efficient and recyclable adsorbents for dye pollutant removal from wastewater.” Nanotechnology, 20, 1-10.
18- Andreozzi, R., Caprio, V., Insola, A., and Marotta, R. (1999). “Advanced Oxidation Processes (AOP) for water purification and recovery.” Catalysis Today, 53, 51-59.
19- USEPA. (1998). Handbook of advanced photochemical oxidation processes, EPA/625/R-98/004, Office of Research and Development, USA.
20- Konstantinou, I. K., and Albanis, T. A. (2004). “TiO2-assisted photocatalytic degradation of azo dyes i aqueous solution, kinetic and mechanistic investigations, A review.” Appl. Catal. B, Environ., 49, 1-4.
21- Mahmoodi, N. M., Rayat Tari, K. H., Borhany, S., Arami, M., and Nourmohammadian, F. (2008). “Decolorization of colored wastewater containing azo acid dye using photo-fenton process, operational parameters and a comparative study.” J. Color Science and Technology, 2, 31-40.
22- Mahmoodi, N. M., Arami, M., Gharanjig, K., and Nourmohammadian, F. (2007). “Decolorization and mineralization of basic dye using nanophotocatalysis, pilot scale study.” J. Color Science and Technology, 1, 1-6.
23- Daneshvar, N., Khataee, A., Rasoulifard, M. H., and Seyed Dorraji, M. (2007). “Removal of organic dyes from industrial wastewaters using UV/H2O2, UV/H2O2/Fe (II), UV/H2O2/Fe (III) processes.” J. Water and Wastewater, 61, 34-42. (In Persian)
24- Mahmoodi, N. M., Arami, M., Yousefi Limaee, N., and Salman Tabrizi, N. (2006). “Kinetics of heterogeneous photo-catalytic reactor.” J. Colloid Interface Sci., 295, 159-164.