Structure and Photocatalytic Properties of Mn-Doped TiO2 Loaded on Wood-Based Activated Carbon Fiber Composites

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.

Enhanced Surface Area, Graphene Quantum Dots, and Functional Groups for the Simple Acid-Treated Carbon Fiber Electrode of Flexible Fiber-Type Solid-State Supercapacitors without Active Materials

“…Other carbon-containing functional groups of CC (1636 cm –1 ), CN (1636 cm –1 ), C–N (1177, 1141, and 1083 cm –1 ), CO (1704 cm –1 ), and C–O (1177, 1141, and 1083 cm –1 ) were also observed for the acid-treated CF. In addition, sulfoxide was observed at the 1051 cm –1 (SO) and the NO bonding was found at 1545 cm –1 . − There are numerous functional groups attached on the acid-treated CF, whereas nearly no peaks were observed in the FTIR spectrum for the untreated CF. These phenomena greatly suggest the success of the acid treatment to generate numerous functional groups, which can provide extra Faradaic redox reactions to enhance the energy storage ability of CF electrodes.…”

Fabrication and Anti-Oxidation Ability of SiC-SiO2 Coated Carbon Fibers Using Sol-Gel Method

“…It can prevent CF substrate from contacting the oxygen directly. The type of coating can be various, such as metal coating (Zn, Ni, Cu, Ti, Zr, Ag); oxides coating (SiO 2 , Fe 3 O 4 , Al 2 O 3 , TiO 2 ), nitrides coating (BN, TiN), carbides coating (SiC, TiC, TaC, ZrC, B 4 C), and composite coating (Al 2 O 3 /Y 2 O 3 , ZrC–ZrB 2 –SiC, SiBNC) [5,6,7,8,9,10,11,12,13,14,15,16]. Among them, ceramic coatings are the most promising coatings due to the fact that they are much lighter and have better wettability, which can reduce interface diffusion and reaction.…”

Synthesis and Characterization of Manganese-Modified Black TiO2 Nanoparticles and Their Performance Evaluation for the Photodegradation of Phenolic Compounds from Wastewater

“…The results indicated that the surface area was reduced with Mn doping due to partial pore blockage by Mn, which was consistent with previous work [ 23 ]. In contrast, previous works reported that the surface area increased with the increasing of the Mn concentration [ 35 ]. It should be noted that the surface area of all the Mn-doped samples in the current study was higher than the commercial TiO 2 (50 m 2 /g).…”

“…The crystallite sizes of Mn-TiO 2 increased in the current study, consistent with previous work [ 34 ]. In contrast, Ma et al [ 35 ] reported a decrease in the crystallite size of TiO 2 with the increasing of the Mn doping level. The crystallinity decreased from 62.89 to 45.79% upon the increasing of the Mn concentration to 0.5 wt%.…”