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Reference type: Journal
Authors: Wei ST, Hu XL, Liu HL, Wang Q, He CY
Article Title: Rapid degradation of Congo red by molecularly imprinted polypyrrole-coated magnetic TiO2 nanoparticles in dark at ambient conditions.
Publication date: 2015
Journal: Journal of Hazardous Materials
Volume: 294
Page numbers: 168-176.
DOI: 10.1016/j.jhazmat.2015.03.067
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0304389415002794

Abstract: A novel molecularly imprinted polymer (MIP)-coated magnetic TiO2 nanocomposite was prepared, using methyl orange (MO) as the dummy template and pyrrole as functional monomer, for degradation of Congo red (CR). The nanocomposite was characterized by Fourier transform infrared spectroscopy, thermo-gravimetric analysis, X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The imprinting efficiency of the imprinted nanoparticles was investigated by static binding test, and their degradation ability toward CR was also studied. Moreover, the effects of pH, temperature, dissolved oxygen and oscillation rate on degradation rate of CR were investigated. Results showed that the imprinted nanocomposite had higher adsorption ability for MO compared with the non-imprinted one. Moreover, it could degrade CR rapidly in dark at room temperature and atmospheric pressure and could be recycled easily by a magnet with a good reusability. A degradation mechanism was proposed according to LCGă˘MS analysis of degradation products of CR. The new imprinted nanoparticles showed high catalytic activity at ambient conditions without light illumination and additional chemicals, and therefore, it can be potentially applied to the rapid, "green" and low-cost degradation of CR in industrial printing and dyeing wastewater
Template and target information: methyl ornage, MO, dummy template, Congo red, CR
Author keywords: molecular imprinting, Magnetic TiO2 nanocomposite, Catalytic degradation, Congo Red, Ambient condition


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