Preparation and Characterization of Mn/N Co-Doped TiO₂ Loaded on Wood-Based Activated Carbon Fiber and Its Visible Light Photodegradation

Author： Ma Xiaojun Chen Yin

Publisher： MDPI

E-ISSN： 2073-4360|7|9|1660-1673

ISSN： 2073-4360

Source： Polymers, Vol.7, Iss.9, 2015-09, pp. : 1660-1673

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Abstract

Using MnSO₄·H₂O as manganese source and urea as nitrogen source, Mn/N co-doped TiO₂ loaded on wood-based activated carbon fiber (Mn/Ti-N-WACF) was prepared by sol–gel method. Mn/Ti-N-WACF with different Mn doping contents was characterized by scanning electron microscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopies (XPS), and ultraviolet-visible spectrophotometer. Results showed that the loading rate of TiO₂ in Mn/Ti-N-WACF was improved by Mn/N co-doping. After calcination at 450 °C, the degree of crystallinity of TiO₂ was reduced due to Mn/N co-doption in the resulting Mn/Ti-N-WACF samples, but the TiO₂ crystal phase was not changed. XPS spectra revealed that some Ti⁴⁺ ions from the TiO₂ lattice of Mn/Ti-N-WACF system were substituted by doped Mn. Moreover, new bonds formed within N–Ti–N and Ti–N–O because of the doped N that substituted some oxygen atoms in the TiO₂ lattice. Notably, the degradation rate of methylene blue for Mn/Ti-N-WACF was improved because of the co-doped Mn/N under visible-light irradiation.