Preparation of Na₂Ti₃O₇/Titanium Peroxide Composites and Their Adsorption Property on Cationic Dyes

Abstract

Na2Ti3O7/titanium peroxide composites (TN-TP) were successfully prepared with the reaction of Ti foils, NaOH, and H2O2at 60°C for 24 h in water bath. The Na2Ti3O7appeared as nanorods in composites. Water bath temperature, water bath time, and the concentration of H2O2and NaOH were crucial. The reaction mechanism was proposed. TN-TP was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric and differential scanning calorimetry (TG-DSC). TN-TP was a mesoporous material and exhibited stronger adsorption capability for neutral red (NR), malachite green (MG), methylene blue (MB), and crystal violet (CV) than pure Na2Ti3O7and pure titanium peroxide, and the saturated adsorption capacities were 490.21, 386.13, 322.81, and 292.74 mg/g at 25°C, respectively. It was found that the pseudo-second-order kinetic model and the Langmuir model could well describe the adsorption kinetic and isotherm of cationic dyes studied. The results of this work are of great significance for environmental applications of TN-TP as a promising adsorbent material for dyeing water purification.

Roles of Ti in Electrode Materials for Sodium-Ion Batteries

“…After optimization of the electrolyte and binder, the Na 2 Ti 3 O 7 electrode exhibited a reversible capacity of 188 mAh/g in 1 M NaFSI/PC electrolyte and sodium alginate as a binder at a current rate of 0.1C in a voltage range of 0.0-3.0 V. Unfortunately, the cycling properties are not satisfactory. In order to improve cycle life, Na 2 Ti 3 O 7 @MWCNTs (Wei et al, 2014), Na 2 Ti 3 O 7 /C (Ding et al, 2017), Na 2 Ti 3 O 7 @N-Doped Carbon Hollow Spheres (Xie et al, 2017), Na 2 Ti 3 O 7 /Titanium Peroxide (Zhao et al, 2015) and F-Doping Na 2 Ti 3 O 7 (Chen et al, 2018) were investigated. However, their performances were not satisfactory due to the low electronic conductivities and structural instability which needs to be further improved.…”

Design of Sodium Titanate Nanowires as Anodes for Dual Li,Na Ion Batteries

“…The lack of voltage plateaus has also been established for Na 2 Ti 6 O 13 when it is discharged to 0 V, and the intercalation reaction follows a solid-state solution mechanism [44]. However, a well-resolved plateau emerges at 0.8 V when Na 2 Ti 6 O 13 is discharged to 0.3 V [15]. To check whether the hydrothermally prepared titanates exhibited a voltage plateau upon Na + insertion, Figure S2 (Supplementary Materials) shows the charge/discharge curves of NTO-2 discharged to 0.5 V. As can be seen, the charge/discharge curves displayed only a gradual increase/decrease in the potential range of 2.0-0.5 V, and there were no signs for the development of voltage plateaus.…”

“…The first approach aims to functionalize the titanates on the highly conductive materials, such as multi-walled carbon nanotubes, carbon nanotube and graphene, N-doped carbon hollow spheres, titanium peroxide, carbon coating, PEDOT coating, etc. [11][12][13][14][15][16][17]. The second approach consists in the manipulation of particle dimensions and morphology, resulting in development of nanorods, nanoplatelets, and nanosheets of Na 2 Ti 3 O 7 , nanowires, nanotubes, 3D micro-flowers, exfoliated Na 2 Ti 3 O 7 , restacked oxides, etc.…”

Dye Degradation Mechanisms Using Nitrogen Doped and Copper(II) Phthalocyanine Tetracarboxylate Sensitized Titanate and TiO2 Nanotubes

“…25,26 Titanate nanotubes, for instance, have proved to be capable of mineralizing methylene blue 27 and catalyzing the oxidative desulfurization of dibenzothiophene 28 in catalytic experiments mediated by H 2 O 2 in the absence of light. Peroxide-modified titanium materials also exhibit enhanced adsorption of cationic species 29 exchange capacity. 26 Metalophthalocyanines, such as copper(II) phthalocyanine, are also capable of catalyzing the homolytic dissociation of H 2 O 2 , generating radicals 30,31 that can degrade organic species.…”

“…In addition to being known as promising photocatalysts, titanium nanomaterials have been applied in catalytic processes that are mediated by hydrogen peroxide, where Ti­(IV) interacts with H 2 O 2 and produces radical species. , Titanate nanotubes, for instance, have proved to be capable of mineralizing methylene blue and catalyzing the oxidative desulfurization of dibenzothiophene in catalytic experiments mediated by H 2 O 2 in the absence of light. Peroxide-modified titanium materials also exhibit enhanced adsorption of cationic species and ion exchange capacity . Metalophthalocyanines, such as copper­(II) phthalocyanine, are also capable of catalyzing the homolytic dissociation of H 2 O 2 , generating radicals , that can degrade organic species. , …”