title: Rapid degradation of Congo red by molecularly imprinted polypyrrole-coated magnetic TiO2 nanoparticles in dark at ambient conditions.
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 LC-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.
authors: School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China.
authors: Shoutai
authors: S
authors: Wei
authors: School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China.
authors: Xiaolei
authors: X
authors: Hu
authors: School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China.
authors: Hualong
authors: H
authors: Liu
authors: School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China.
authors: Qiang
authors: Q
authors: Wang
authors: School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China. Electronic address: chiyanghe@hotmail.com.
authors: Chiyang
authors: C
authors: He
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D002384:Catalysis; D003224:Congo Red / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000737:chemistry; D060328:Magnetic Phenomena; D054802:Molecular Imprinting; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D011108:Polymers; D011758:Pyrroles; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C067635:polypyrrole; D003224:Congo Red; C100258:methyl orange; D012822:Silicon Dioxide; D014025:Titanium; D052203:Ferrosoferric Oxide
keywords: Ambient condition; Catalytic degradation; Congo red; Magnetic TiO(2) nanocomposite; Molecular imprinting