Crystalline Phase Of TiO2 Research Articles

RETRACTED: Chitosan-Coated Titanium Dioxide-Embedded Paclitaxel Nanoparticles Enhance Anti-Tumor Efficacy Against Osteosarcoma

ObjectiveTitanium dioxide nanoparticles (TiO2) nanoparticles have been widely explored in the prevention of cancer risk. Due to the difficult solubility of TiO2 nanoparticles, it is essential to synthesize new surfactants to increase its bioavailability and anti-tumor activity and reduce its cytotoxicity. Furthermore, oxidative and inflammation are closely associated with the osteosarcoma risk. Chitosan has biocompatibility, antioxidant and anti-inflammatory properties. The effects of chitosan-coated TiO2-embedded paclitaxel nanoparticles on an osteosarcoma model were explored.MethodsAn osteosarcoma model was established and chitosan-coated TiO2-embedded paclitaxel nanoparticles were prepared using a freeze-drying strategy. The morphological characteristics of nanoparticles were observed using scanning electron microscopy (SEM). The physicochemical properties of nanoparticle were evaluated by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The cytotoxicity was tested by using human osteoblast cells hFob1.19 and osteosarcoma cells 143B. Osteosarcoma mice were treated with PBS buffer, paclitaxel, TiO2-embedded paclitaxel and chitosan-coated TiO2-embedded paclitaxel nanoparticles. The biomarkers of oxidative-inflammatory status, anti-tumor activities and survival rates of the model were measured.ResultsXRD analysis showed that the peaks of chitosan/TiO2 (anatase) were consistent with those of crystalline TiO2 and broad phase of chitosan. The FTIR spectrum indicated the relevant functional groups in TiO2. Chitosan-coated TiO2-embedded paclitaxel nanoparticles had good biocompatibility and improve antioxidant and anti-inflammatory properties in the osteosarcoma model. Chitosan-coated TiO2-embedded paclitaxel nanoparticles was less toxic to the cells hFob1.19 and more toxic to the cells 143B than TiO2-embedded paclitaxel nanoparticles. Chitosan-coated TiO2-embedded paclitaxel nanoparticles showed significant antitumor activity and increased the survival rate of the osteosarcoma model (P < 0.05).ConclusionsChitosan improved anti-tumor potential of TiO2-embedded paclitaxel nanoparticles in the prevention of osteosarcoma.

The multi-effects of K2TiF6 additive on the properties of PEO coatings on AZ31 Mg alloy

Plasma electrolytic oxidation of AZ31 Mg alloy was performed in an alkaline silicate-based solution containing various concentrations of K2TiF6 using unipolar waveform at a constant voltage. The surface morphology of all coatings was rough and contained a micro-pore network, micro-cracks, and granules of oxide compounds in different diameters and micro-pore levels. The coating is composed of MgO, MgF2, Mg2SiO4, SiO2 (amorphous), and TiO2 (crystalline and amorphous) phases. The average thickness of the coatings was increased by adding the K2TiF6, where EDS results showed that a skinny fluoride-rich passive layer forms. With increasing time and reaching the final potential, the TiO2 colloidal particles absorbed physically by the oxide erupted into the discharge channels allowing the formation of a thicker and more compact layer coating along with the pore sealing. Incorporation of silicate ions develops amorphous SiO2 in the coating that also partially seals the pores in the coating. Long-term corrosion performance of the coatings was investigated using EIS during 7 days of immersion in 3.5 wt% NaCl solution. It was found that the barrier performance of the PEO coatings was improved by adding K2TiF6 up to 5 g l−1. The coating produced in the presence of 5 g l−1 K2TiF6 displayed the lowest porosity percent (13.04%) with an appropriate thickness, which provided the highest barrier performance at both short- and long-immersion times.

Tailoring materials by high-energy ball milling: TiO2 mixtures for catalyst support application

We carried out a rational design of catalyst supports by high-energy ball milling. Tailored mixtures of TiO2 crystalline phases were obtained using rotational speed and milling time as variable parameters. Polymorphic transformation from anatase to rutile through high-pressure TiO2 (II) as intermediate was confirmed by X-ray Diffraction (XRD), Raman Spectroscopy and Transmission Electron Microscopy (TEM). Also, starting material doubled its specific surface area due to particle fragmentation, as confirmed by surface area of Brunauer-Emmet-Teller (SBET) and Scanning Electron Microscopy (SEM). Defects introduced during milling process generated oxygen vacancies in the surface and bulk of supports, as evidenced by X-ray Photoelectron Spectroscopy (XPS) and Electron Paramagnetic Resonance (EPR). Furthermore, longer milling time increased reducibility and oxygen mobility of supports, as observed by H2 Temperature Programmed Reduction (H2-TPR) and O2 Temperature Programmed Desorption (O2-TPD). Phase composition remained unchanged even under extreme conditions, highlighting the stability of unusual TiO2 (II) phase. Properties achieved in present materials could benefit metal-support interactions and play a major role in supported catalysts.

Influence of mixed-phase TiO2 on the activity of adsorption-plasma photocatalysis for total oxidation of toluene

Herein, the effects of different crystalline phases of TiO2 on the adsorption-plasma photocatalytic oxidation of toluene were investigated. First, photocatalysts loaded on a molecular sieve (MS) were characterised and the catalytic performance of toluene abatement was evaluated in a plasma system. The COX yield of the pure anatase (An) sample outperformed other samples in the adsorption-plasma photocatalytic oxidation process, especially for CO2 yield (69.1%). It was revealed that the highest space-time-yield of 2.35 gco2/Lcat•h was also achieved using plasma-An/MS. However, the highest total toluene abatement (99.5%) was achieved in the plasma-P25/MS system. The plasma-generated UV flux only played a minor role in photocatalyst activation because of the very low UV flux of 2.7 μW/cm2 generated by discharge. For the degradation pathway, compared with the plasma-MS system, byproducts of 1,3-Butadiyne (C4H2), guanidine, methyl- (C2H7N3) did not exist in the TiO2-assisted system, indicating a difference in the toluene degradation pathway. There were no obvious effects of different TiO2 samples on organic byproducts generation, and almost a complete mineralisation of all byproducts was observed after 30 min of treatment, with the exception of ethylamine (C2H7N) and acetaldehyde (C2H4O). Finally, a cycled adsorption-plasma study was conducted to reveal the sustainability of the process. A partial deactivation of plasma-An/MS with less than 7% decrease in CO2 selectivity after 7 cycles was revealed, which is a promising result for use in possible industrial applications.

Synthesis of Value-Added Chemicals via Oxidative Coupling of Methanes over Na2WO4-TiO2-MnO x /SiO2 Catalysts with Alkali or Alkali Earth Oxide Additives.

Na2WO4–TiO2–MnOx/SiO2 (SM) catalysts with alkali (Li, K, Rb, Cs) or alkali earth (Mg, Ca, Sr, Ba) oxide additives, which were prepared using incipient wetness impregnation, were investigated for oxidative coupling of methane (OCM) to value-added hydrocarbons (C2+). A screening test that was performed on the catalysts revealed that SM with Sr (SM–Sr) had the highest yield of C2+. X-ray photoelectron spectroscopy analyses indicated that the catalysts with a relatively low binding energy of W 4f7/2 facilitated a high CH4 conversion. A combination of crystalline MnTiO3, Mn2O3, α-cristobalite, Na2WO4, and TiO2 phases was identified as an essential component for a remarkable improvement in the activity of the catalysts in the OCM reaction. In attempts to optimize the C2+ yield, 0.25 wt % Sr onto SM–Sr achieved the highest C2+ yield at 22.9% with a 62.5% C2+ selectivity and a 36.6% CH4 conversion. A stability test of the optimal catalyst showed that after 24 h of testing, its activity decreased by 18.7%.

Novel synergistic combination of Cu/S co-doped TiO2 nanoparticles incorporated as photoanode in dye sensitized solar cell

Novel sol-gel route was adopted for the synthesis of undoped and Cu/S co-doped TiO2 nanoparticles (NPs) with constant content 0.05 at% of non-metal Sulfur and diverse content from 0.1 to 0.5 at% of metal Copper. The formation of anatase TiO2 crystalline phase was observed from XRD results with the crystallite size less than 11 nm for all the synthesized samples. The UV–Vis analysis revealed that co-doping with Cu/S altered the optical properties of TiO2 and extended absorption in the visible light region with red shift in band gap energies. EDAX analysis confirmed the purity of Cu/S co-doped TiO2 nanoparticles and also the evident presence of titanium, oxygen, copper and sulfur atoms in stoichiometric ratio. In photovoltaic measurements, under simulated solar irradiation the DSSC based on Cu/S co-doped TiO2 with 0.3 at% Cu and 0.05 at% S has exhibited the best power conversion efficiency (PCE) of 10.44% with significantly improved short circuit current density (Jsc) of 22.05 mA/cm2. This enhanced PCE is attributed to the appropriate particle size, enhanced surface area, higher dye adsorption and hence improved short circuit current density (Jsc). In contrast, the undoped TiO2 NPs based DSSC has displayed a PCE of 6.37% with Jsc of 14.85 mA/cm2.

Mapping Point Defects of Brookite TiO2 for Photocatalytic Activity Beyond Anatase and P25

Brookite, the least studied crystalline phase of TiO2, recently has been found to have excellent photocatalytic activities, comparable to that of anatase TiO2. However, its activity is highly depen...

Effect of calcination temperature on the structure and properties of SiO2 microspheres/nano-TiO2 composites

The silica microspheres surface-coated nano-TiO2 composite material (MS-SiO2/TiO2) was prepared by co-grinding the silica microspheres (MS-SiO2) and nano titanium dioxide soliquid (nano-TiO2-sol) in a stirring mill, and then calcining the above grinding products. The photocatalytic performance (methyl orange as the target pollutant) and surface photoinduced hydrophilicity of MS-SiO2/TiO2 calcined at different temperatures were tested, and their structure and morphology were characterized. The calcination temperature has a great effect on the structure and properties of MS-SiO2/TiO2 composites. The composite particles calcined at 300 °C (MS-SiO2/TiO2-300) have low photocatalytic efficiency because they are aggregated seriously and the crystalline phase of TiO2 in MS-SiO2/TiO2-300 has not formed. While, the MS-SiO2/TiO2-500 composite particles showed a good separation state. The TiO2 particles on MS-SiO2 were single anatase phase, and its particle size was about 10–20 nm, exhibiting a well dispersion state. The degradation rate of MS-SiO2/TiO2-500 under 90 min ultraviolet irradiation was 92%, and the water contact angle was 10°, which was better than pure nano-TiO2. In MS-SiO2/TiO2, the reduction of TiO2 particles aggregation, improvement of dispersion and the presence of a single anatase phase were important factors for MS-SiO2 to exert a synergistic effect, which led to the enhancement of nano-TiO2 functional efficiency.

Development of functional TiO2 coatings deposited on cementitious materials

This present paper evaluates the functionality of different TiO2 coatings deposited on the exposed surface of Portland cement pastes. Cement pastes coated from a crystalline TiO2 suspension (CS) and an amorphous TiO2 solution (AS) were compared. Some samples with film deposition from AS were submitted to autoclave treatment. Film deposition was carried out by spin-coating with 1, 2, 3 or 5 coating layers. The coating morphology was observed by SEM and the possible presence of TiO2 crystalline phase was confirmed by XRD. Static water contact angle and RhB degradation were used to assess the photo-induced activity of the films. All the films deposited from CS exhibits both photo-induced superhydrophilicity and photoactivity. The samples coated from AS display only a minor increase in the rate of degradation of rhodamine B. The results suggest that the autoclave treatment did not favor the formation of crystalline TiO2 phases.

Sustainable development of inexpensive visible-range CuO[sbnd]TiO2 nano-photocatalysts deploying in situ recovered glass fiber and Cu(CH3COO)2 from waste printed wiring board: Optimal lignin photo-degradation for valuable products

Inexpensive glass fiber (GF) support as well as copper acetate precursor recovered in situ from waste printed wiring boards (WPWB) have been utilized for preparation of GF supported CuO-TiO2nano-photocatalyst (NP) through sequential sol-gel and wet-impregnation methodology deploying solar-resembling quartz-halogen radiation (SRQHR) (wavelength: 0.32–1.1 μm).The optimal NP (QGF-CuO-TiO27.5) possessed finer nano TiO2 and CuO crystalline phases (7.31 nm) and higher BET surface area (62.107 m2.g−1) compared to conventionally prepared NP (crystallite size: 33.38 nm, surface area: 42.170 m2.g−1); thus, advocating the supremacy of SRQHR over conventional thermal-energy. Furthermore, UV–Vis-NIR diffuse spectroscopy revealed that QGF-CuO-TiO27.5 was capable of absorbing light in the visible spectrum, owing to its low bandgap energy (2.26 eV). Taguchi orthogonal design was used to investigate and optimize the efficacy of the prepared NPs in lignin (rice straw extracted) photo-degradation process employing an energy-efficient SRQHR assisted rotating batch reactor (RBR). The optimal QGF-CuO-TiO27.5 rendered a significantly higher lignin photo-degradation (89.73%) compared to the conventionally prepared NP (54.53%) at optimal conditions (70 °C; 50 min; 200 rpm). Moreover, lignin photo-degradation in RBR exhibited higher degradation percentage (89.73%) compared to that (67.78%) achieved in a conventionally agitated reactor. Overall sustainability of lignin photo-degradation process for production of lignin-derivatives (vanillin, syringaldehyde, vanillic acid) analysed via life cycle assessment (LCA) study evidently revealed that the QGF-CuO-TiO27.5 catalysed process resulted less environmental impacts in comparison with its conventional counterpart and commercial nano-TiO2 catalyst.

A novel method for biosynthesis of different polymorphs of TiO2 nanoparticles as a protector for Bacillus thuringiensis from Ultra Violet

Bacillus thuringiensis (Bt) were used for biosynthesis of amorphous TiO2 converted to distinct polymorphs (anatase, rutile, mix) under different temperature conditions. Characterizations of TiO2 nanoparticles were performed by using X-ray diffraction spectroscopy (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and, energy-dispersive X-ray spectroscopy (EDX) analysis. Stability of five formulations under ultraviolet (UV) radiation with spore viability and mortality test on Ephestia kuehniella Zeller larvae were investigated. TiO2(mix) showed the highest viabilities of 79.76% after exposure to ultraviolet (UVA385 nm), while viabilities of non-protected spores under these conditions were 41.32%. The mortality of TiO2(mix), TiO2(anatase), TiO2(rutile), TiO2(amorphous) and free spore formulations on second-instar larvae of Ephestia kuehniella were 73.76%, 71.24%, 57.12%, 51.32%, and 50.32%, respectively on the 10th day of the experiment. The obtained results suggest that TiO2(amorphous) does not increase Bt resistance, but both phases of TiO2 nanoparticles synthesized (anatase and rutile) through the Bacillus thuringiensis and phase mixture can increase the persistence of Bt to the UV light. Furthermore, the combination of both crystalline phases of TiO2(mix) has the highest performance in improving the Bt resistance.

Differences in the selective reduction mechanism of 4-nitroacetophenone catalysed by rutile- and anatase-supported ruthenium catalysts

Ru nanoparticles supported on different crystalline TiO2(anatase and rutile) phases result in different reaction pathways for 4-nitroacetophenone.

Mechanistic studies of biomineralisation on silver incorporated anatase TiO2.

Here we report silver incorporated anatase TiO2 developed on Ti metal by H2O2-AgNO3 and heat treatment to have faster biomineralisation or apatite-forming ability in simulated body fluid (SBF). Apatite-forming ability has been investigated concerning heat treatment temperatures ranges, 400-800°C and duration of soaking period in SBF. The apatite formation showed an increasing trend with increase in the heat treatment temperatures up to 600°C and beyond that the Ti metal lost this ability. XRD as wells as Raman results of such chemical and heat-treated Ti metal at different temperatures further correlates the apatite nucleation directly in relation with that of anatase to rutile TiO2 formation. Further, a time dependent apatite mineralisation study by XPS revealed simultaneous calcium and phosphate deposition at the early stage of soaking in SBF. Therefore, the apatite nucleation in the present chemically treated Ti metal depends on the crystalline phase of TiO2 formed by H2O2 and heat treatment along with Ag+ ion release.

MODIFICATION OF Ti–6Al–4V ALLOYS FOR DENTAL IMPLANT AND ITS CAPACITY TO GROW HUMAN OSTEOBLAST ATCC

Modification of Ti–6Al–4V alloys with silver-loaded TiO2 nanotubes was investigated. In this study, TiO2 nanotube (TiNT) was grown on the surface of Ti–6Al–4V plates by means of anodization in an electrolyte solution containing glycerol, water and 0.5[Formula: see text]wt.% of NH4F. Silver particles were deposited on TiNT using a Photo-Assisted Deposition (PAD) method. Formation of crystalline phase of TiO2 on the surface was confirmed by means of XRD while its superficial morphology was observed using FESEM/EDS. Hydrophilicity was assessed by means of contact angle measurement. As-synthesized silver-loaded TiNT on osteoblast ATCC growth in vitro was also investigated in terms of its capacity in supporting osseointegration. The cell viability was determined by MTT (3-[4,5-dimethylthiazol-2yl]-2,5diphenyl-2H-tetrazolium bromide) assay and its differentiation activity was measured by alkaline phosphatase (ALP) assay. The results showed that desposition of silver on TiNT increased cell viability after 14 days culture while improving the hydrophilicity feature. Silver-loaded TiNT on Ti–6Al–4V alloy with Ag precursor concentration of 0.10[Formula: see text]M showed the optimum viability of osteoblast growth, with 14% improvement in comparison to its unmodified counterpart. The MTT assay showed that no cytotoxicity in vitro was observed on this material. This study provides corroborating evidences that the modification of Ti–6Al–4V alloy may enhance the cell viability and its prominence as dental implant materials.

Synthesis and characterization of Titanium dioxide nanopowder for various energy and environmental applications

Titanium dioxide (TiO2) nanoparticles were synthesized by sol-gel route using Titanium Tetraisopropoxide (TTIP) as the precursor. The synthesized product was characterized by using powder X-Ray diffraction. The X-Ray diffraction pattern of TiO2 nanoparticles with 2 <theta> peaks at 25.4° indicates the presence of pure crystalline Anatase phase of TiO2. The microstructure and phase composition were analyzed by High resolution Scanning Electron Microscopy (HRSEM) and Energy Dispersive X-ray Analysis (EDX). The morphology of the as synthesized nanoparticles was spherical in shape with strong agglomeration. Sample shows spherical uniform morphology in the form of TiO2 nano clusters as revealed in HRSEM analysis. EDX spectra revealed the presence of stoichiometric proportion of Ti and O elements without extra signals which affirms the pure phase of antase TiO2. Fourier Transform Infrared Spectroscopy spectra (FTIR) analysis showed the Ti-O stretching vibration bonds which illustrate the absorption spectra of TiO2 nanoparticles (around 3426 cm−1) which indicate the presence of hydroxyl group with stretched bonds. Ultraviolet visible spectra analysis with Tauc plot illustrates the optical properties and facilitates to determine the band gap energy (Eg) of the synthesized TiO2 nanomaterials which comes out to be 3.025 (eV). The band gap increases with the decrease in the particle size. Smaller crystallite size will have larger band gap and larger crystallite size will have smaller band gap. Titanium dioxide (TiO2) Nanoparticles has increased significant consideration in the energy/vitality and other ecological divisions due to their splendid prospects in photocatalysis, dye sensitized solar cells, natural contamination treatment and its utilization in sun powered water partition for the generation of hydrogen.

Effect of acid on the crystalline phase of TiO2 prepared by hydrothermal treatment and its application in the oxidative steam reforming of methanol

Titania (TiO2) supports with anatase (A), mixed, and rutile (R) crystalline phases were prepared via the hydrothermal treatment of titanium isopropoxide and investigated as a catalyst for the oxidative steam reforming of methanol (OSRM). The different TiO2 phases were synthesized using different types of acid: acetic (HAc), nitric, and a mixture of HAc and hydrochloric acids, and hydrothermal (90 or 200 °C) or calcination (560 or 750 °C) temperatures. X-ray diffraction analysis revealed the crystal structure of successfully synthesized TiO2 with different TiO2-A:TiO2-R ratios. The TiO2-R with (110) and (101) planes showed the highest catalytic activity for OSRM in the temperature range of 200–400 °C.

SINTESIS TiO2/Ti DENGAN TEKNIK ANODISASI DAN UJI AKTIVITAS FOTOKATALIS SEBAGAI ANTIBAKTERI Escherichia coli

Titanium dioxide (TiO2) thin layer on the surface of metal Ti has been successfully synthesized using anodization method by varying the anodization times 30, 45 and 60 minutes. Characterization of TiO2/Ti with FTIR method gives absorption peaks at wave number 457,490 cm-1 and 796,635 cm-1, which is a Ti-O vibration. Visualization TiO2/Ti under SEM showed pores with diameter of 10-45 nm as an indication of the morphology of nanotubes, although the length of tubes have not been obtained. The results of XRD measurement give diffractogram at 2q: 25,337°; 37,891° and 48,074° and characterization DR-UV visible value 3,276 eV band gap which characterize crystalline anatase TiO2 phase. Photocatalytic TiO2/Ti exhibit antibacterial activity Escherichia coli were tested using the method of turbidimetry with a spectrophotometer at wavelength of 600 nm. Photocatalyst TiO2/Ti which are synthesized by anodizing process for 60 minutes have inhibitory bacterial growth better than synthesized for 30 minutes and 45 minutes.

Role of block copolymer template for tailoring crystal structure and band gap of titania in mesoporous silica and organosilica particles

This work presents the tailoring of distinct titania (titania oxide) (TiO2) crystal structures inside the mesoporous silica and organosilica using several different block copolymer templates in acidic aqueous solution with different acidity. Different crystal structures of TiO2 have been obtained as rutile and anatase phases, mainly depending on the chemical composition of block copolymer templates used in this study. A PEO-PLGA-PEO (EO17(L28G7)EO17, LGE54) triblock copolymer, as well as typical Pluronic P123 (EO20PO70EO20) and F127 (EO106PO70EO106) triblock copolymers was employed as structure-directing templates for the sol-gel reaction of silane precursors. As silica and organosilica precursors, tetraethyl orthosilicate (TEOS), 1,2-bis(triethoxysilyl)ethane (BTEE), and 1,4-bis(triethoxysilyl)benzene (BTEB) were utilized with a titanium butoxide precursor. The crystal structure of TiO2 and its corresponding band gap were investigated using X-ray diffraction (XRD) and ultraviolet–visible spectroscopy (UV–vis) measurements, respectively. Anatase crystalline phase of TiO2 was found in the mesoporous sample prepared with Pluronic copolymer (i.e. P123 and F127) templates. On the other hand, the rutile phase was developed only in mesoporous samples prepared with an LGE54 PEO-PLGA-PEO triblock copolymer template. It was found the TiO2 crystal structure is varied mainly depending on the polymer template under various strong acidic conditions. It seems that a thermodynamically more stable rutile phase can be formed using a more hydrophobic LGE54 template which supplies stronger micelle core as a platform. Further, it is known that the incorporation of TiO2 in mesoporous silica and organosilica samples induces the conduction activity, especially toward the blue light region. Thus, this work can be applied to produce effective blue region semiconductor material with different crystallite structures by tuning the precursors and copolymer templates.

Tailoring of TiO2 film microstructure by pulsed-DC and RF magnetron co-sputtering

In current study unconventional method of TiO2 film deposition by co-sputtering from two symmetrically placed inclined pulsed-DC and RF powered magnetrons has been tested. The differences in crystallinity, crystal texture and surface morphology of the films deposited by single magnetron and two magnetron co-sputtering process were investigated. For most of the practical applications anatase phase TiO2 with high fraction of {001} facets is desired. However, it was demonstrated that at maximum nominal power without sample heating/calcination single pulsed-DC magnetron sputtering tends to form smooth amorphous TiO2 films. On the other hand, due to the higher energetics of physical vapour condensation under similar conditions single RF magnetron sputtering deposits relatively rough films with highly oriented crystalline rutile and anatase TiO2 phases (phase orientations (110) and (101) respectively). By introducing pulsed-DC and RF magnetron co-sputtering approach it was possible to tailor the nucleation and growth of TiO2 crystalline domains and to form purely anatase phase TiO2 films with relatively high fraction of photocatalyticaly the most active {001} facets. Main insights into the advantages of the two magnetron co-sputtering process as well as general guidelines on promotion of specific crystal phases with different crystallographic orientation are provided.

Rapid fabrication of TiO2 nanobelts with controllable crystalline structure by microwave-assisted hydrothermal method and their photocatalytic activity

TiO2 nanobelts (NBs) have received much attention due to their chemical stability, nontoxicity, special one-dimension morphology and also have found many applications. However, extensively employed hydrothermal processes are time-consuming. In this work, a microwave-assisted hydrothermal (MAH) method is for the first time reported for the rapid fabrication of TiO2 NBs. TiO2 NBs with widths of 25–200 nm and lengths up to tens micrometers can be successfully fabricated by adjusting the concentration of NaOH solution, reaction time and reaction temperatures. By MAH method, the reaction time can be greatly shortened to 4 h under microwave irradiation compared to 1–3 days reported in literature. Bi-crystalline structures with monoclinic TiO2(B) and tetragonal anatase can be tuned by simply adjusting thermal treatment temperatures. The evolution of different crystalline structures from starting H2Ti3O7 to crystalline TiO2 phases with increasing calcination temperatures was analyzed by different techniques. The photocatalytic activity results reveal that bi-crystalline structures with TiO2(B)/anatase phases (optimal B:A ratio of 66:34) are advantageous to enhance the photocatalytic performance of TiO2 NBs in photo-decomposing Rhodamine B molecules in water under UV irradiation.