Abstract
Mn-doped TiO2 loaded on wood-based activated carbon fiber (Mn/TiO2-WACF) was prepared by sol–gel and impregnation method using MnSO4·H2O as manganese source. The structure of Mn/TiO2–WACF was characterized by SEM, XRD, FTIR, N2 adsorption and UV–Vis, and its photocatalytic activity for methylene blue degradation was investigated. Results show that Mn-doped TiO2 were loaded on the surface of wood-based activated carbon fiber with high-development pore structures. The crystallite sizes of Mn-doped TiO2 in composites were smaller than that of the undoped samples. With an increase of Mn doping content, Ti–O bending vibration intensity of Mn/TiO2–WACF increased and then decreased. Moreover, Ti–O–Ti and Ti–O–Mn absorption peaks increased upon doping of Mn. Mn/TiO2–WACF with low specific surface area, and pore volume was improved at 3.5–6.0 nm of mesopore distributions due to the Mn-doped TiO2 load. In addition, the UV–Vis showed that Mn/TiO2–WACF (photodegradation rate of 96%) has higher photocatalytic activity than the undoped samples for methylene blue degradation under visible light irradiation.
Highlights
As a well-known photocatalyst, TiO2 has attracted lots of interest over the past decades due to its chemical stability, thermal stability, high efficiency, nontoxicity, and low cost [1]
SEM micrographies of the WACF are shown in Figure 1a, the surface of Mn/Ti–WACF had a layer of Mn-doped nano-TiO2 film with uniform thickness (Figure 1c)
Mn-doped nano-TiO2 films were loaded on the surface of WACF, but some tilted and shed in the edges, mainly due to the inconsistency of the fiber and modified photocatalyst shrinkage under high-temperature calcination
Summary
As a well-known photocatalyst, TiO2 has attracted lots of interest over the past decades due to its chemical stability, thermal stability, high efficiency, nontoxicity, and low cost [1]. The most important and challenging issue is to develop efficient visible light responsive photocatalysts by the modification of TiO2 and curing. The activated carbon fiber has become the main carrier of photocatalytic oxidation technology due to its good adsorption performance and photocatalytic synergistic effect [20]. With the growing awareness of environmental protection and the shortage of fossil resources, the sustainable development of biomass activated carbon fiber has gradually became an alternative photocatalyst carrier material and has shown excellent performance [21,22,23]. From liquefied wood as a carrier and Mn-doped TiO2 as photocatalyst, the photocatalytic composite materials (Mn/TiO2 –WACF) were prepared by the sol-gel and impregnation method. The photocatalytic degradation of photocatalytic composite for methylene blue (MB) under visible light conditions is discussed
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