Abstract
Organic Pigments are one of the most common pollutants in waste water of many industries such as textiles, chemicals, etc [1]. One of these hazardous pigments is methylene blue, a cationic pigment being a mutagen, carcinogen and resistant to biological decomposition [2]. There are various techniques to eliminate this pollutant, for example, chemical oxidation [3], floatation and coagulation [4], electrochemical treatment [5], liquid-liquid extraction [6], membrane filtration [7], ozonation [8] and surface adsorption [9]. Another way of eliminating this pollutant is photocatalytic analysis. Among these treatment methods, photocatalysis is a green and suitable technology to decrease organic pollutants in wastewater which has considered as a promising approach for pollution abatement and recovering of wastewaters [10]. Many studies have been reported that numerous organic pollutants can be decomposed completely through photocatalysis using metal oxide semiconductor nanostructure under UV irradiation [11]. Due to this reason that only about 4% of the solar spectrum is in the UV region, various high performance visible light photocatalysts have been developed [12]. However to the best of our knowledge, MOFs and their composites have not been widely studied for the photocatalytic degradation of organic dyes from wastewater pollutions. In this work, for the first time, we have synthesized a novel MOF/BiFeO3 composite as a catalyst with a high efficient photocatalytic capability for the degradation of methylene blue (MB) in visible light range in the presence of LED 5W lamp. The nanoscale pores in addition to the photocatalytic degradation process, causing part of the contaminants to be removed from the environment by adsorption.
References
[1] M.S. Sajab, C.H. Chia, S. Zakaria, S.M. Jani, M.K. Ayob, K.L. Chee, P.S. Khiew, W.S. Chiu, Citric acid modified kenaf core fibres for removal of methylene blue from aqueous solution, Bioresource technology. 102 (2011) 7237-7243.
[2] S.-M. Lee, S.-T. Ong, Oxalic Acid Modified Rice Hull as a Sorbent for Methylene Blue Removal, APCBEE Procedia. 9 (2014) 165-169.
[3] E. Oguz, B. Keskinler, Comparison among O3, PAC adsorption, O3/H2O2 and O3/PAC processes for the removal of Bomaplex Red CR-L dye from aqueous solution, Dyes and Pigments. 74 (2007) 329-334.
[4] T.-H. Kim, C. Park, J. Yang, S. Kim, Comparison of disperse and reactive dye removals by chemical coagulation and Fenton oxidation, Journal of Hazardous Materials. 112 (2004) 95-103.
[5] L. Fan, Y. Zhou, W. Yang, G. Chen, F. Yang, Electrochemical degradation of aqueous solution of Amaranth azo dye on ACF under potentiostatic model, Dyes and Pigments. 76 (2008) 440-446.
[6] G. Muthuraman, T.T. Tow, L.C. Peng, N. Ismail, Recovery and Reuse of Methylene Blue from Industrial Wastewater Using Benzoic Acid as a Carrier, in: International Conference on Environmental Research and Technology (ICERT), 2008.
[7] S.A. Avlonitis, I. Poulios, D. Sotiriou, M. Pappas, K. Moutesidis ,Simulated cotton dye effluents treatment and reuse by nanofiltration, Desalination. 221 (2008) 259–267.
[8] H. Zhang, L. Duan, D. Zhang, Decolorization of methyl orange by ozonation in combination with ultrasonic irradiation, Journal of Hazardous materials B. 138 (2006) 53–59.
[9] A. Gürses, Ç. Doğar, S. Karaca, M. Acikyildiz, R. Bayrak, Production of granular activated carbon from waste Rosa canina sp. seeds and its adsorption characteristics for dye, Journal of Hazardous Materials. 131 (2006) 254-259.
[10] J. Huang, Y. Cao, Z. Deng, H. Tong, Formation of titanate nanostructures under different NaOH concentration and their application in wastewater treatment, Journal of Solid State Chemistry.3(2011) 712–719.
[11] C. Pan, Y. Zhu, New type of BiPO4 oxy-acid salt photocatalyst with high photocatalytic activity on degradation of dye, Environmental Science& Technology. 14 (2010) 5570–5574.
[12] P. Chowdhury, J. Moreira, H. Gomaa, AK. Ray, Visible-solar- light-driven photocatalytic degradation of phenol with dye-sensitized TiO2: parametric and kinetic study, Industrial & Engineering Chemistry Research. 12(2012) 4523–4532.
