Titania Nanotubes Research Articles

Removal of aqueous uranyl ions using titania-supported mesoporous silica composite with the synergistic effect of coupled adsorption and photocatalytic reduction of U(VI)

The aim of this study is to determine and compare the adsorption capacities, kinetic and thermodynamic parameters of the adsorption process of uranyl ions from aqueous solution on nanotube titania impregnated mesoporous silica SBA-15 (TNT-SBA-15) and naked SBA-15 (nSBA-15) adsorbents. The TNT-SBA-15 composite containing various molar ratio of nanotube titania to silica (TNT-SBA-15(m:n)) in the matrix was synthesized by the sol–gel/impregnation method using sodium silicate as a silica precursor, sulphuric acid and nanotube titania. Batch adsorption experiments showed that the maximum adsorption capacity (qmax) of the TNT-SBA-15(m:n = 1:1) composite under indoor light be as high as 2.65 mMoleU g−1 that was 1.4 times higher than that of nSBA-15 under the same conditions. Under UV (300 W) illumination the qmax of TNT-SBA-15(1:1) adsorbent reached 3.49 mMoleU g−1 that was 2 times higher than the qmax in the dark. The increase in qmax of the TNT-SBA-15(1:1) composite in the two experiments was attributed to the synergistic effect of coupled sorption and photocatalytic reduction of U(VI) by titania following the deposition of uranium (IV) (hydr)oxide on the surface of the adsorbent. The adsorption process followed a pseudo-second kinetic model. The activation energy was found to be 160 and 135 kJ Mole−1 for the adsorption on nSBA-15 and TNT-SBA-15(1:1), respectively. The isotherm of the adsorption process follows the Langmuir as well as Freundlich models. The adsorption is an endothermic and spontaneous process. Adsorbed TNT-SBA-15 can be easily regenerated in 0.3 M HNO3 solution, and the qmax of the adsorbent was maintained at 95% the initial qmax after three consecutive adsorption–desorption cycles. These results revealed that, though TNT-SBA-15 made from inexpensive reagents could be an effective adsorbent for uranyl removal from wastewater.

Electrodeposited CZTS loaded titania nanotubes for photocatalytic water splitting

Copper Zinc Tin Sulphide (Cu2ZnSnS4 (CZTS)) is a promising semiconductor material with optimum direct band gap of 1.4-1.6 eV, large light absorption coefficient (> 104 cm-1) and p-type electrical conductivity. In addition, its earth abundant and non-toxic elemental constituents make it a good candidate to replace the CdTe and CIGS absorber layers used in thin film solar cells. Also, it has properties that make it useful as a buffer layer that helps to reduce the effective band gap of TiO2 when used as an anode for photocatalytic splitting of water. We prepared titania nano tube (TNT) arrays by anodization of titanium foil. Raman spectrum of TNT confirmed the presence of pure anatase phase of TiO2. Field emission scanning electron microscopy images were obtained to analyse the surface morphology of TNT. CZTS sensitized titania nano tube arrays were then prepared by the electrodeposition of CZTS thin films over TNT arrays. FESEM images of the CZTS sensitized titania nano tube arrays showed that the electrodeposited CZTS layer had a fibrous structure. A photo electro chemical (PEC) cell was set up with CZTS sensitized titania nanotubes as anode. An anodic current density of 0.19 mA/cm2 was shown by the PEC cell when the anode was irradiated with blue light of wavelength 430 nm at power 50 mW/cm2. The incident photon to current conversion efficiency was 1.1 %.

An Ab-Initio Study on Mechanical Properties of Titanium Dioxide Single-Wall Nanotube

Titanium dioxide nanotubes (TiO2 NTs) exhibit superior biomechanical compatibility compared to artificial biomaterials. In this study, we employed density functional theory (DFT) calculations using the generalized gradient approximation (GGA) to determine the elastic-plastic regions and Young’s moduli of TiO2 NTs. Following the optimization process, our findings reveal that the Ti-O bond lengths differ depending on whether they are inside or outside bonds, ranging from 1.85 to 2.05 angstrom. Notably, TiO2 NTs demonstrate a low elastic modulus of approximately 29–38[Formula: see text]GPa when subjected to strains between −2% and 2% along the central axis of the nanotube. Regarding the elastic-plastic regions, the first critical point ([Formula: see text] is reached at around 20% strain for the (8,8) TiO2 NT, suggesting that it will transition out of the elastic region faster than the others under uniaxial strain. Additionally, the total density of state (DOS) analysis indicates that all of these structures exhibit semiconductor properties.

The Role of Lattice Defects on the Optical Properties of TiO2 Nanotube Arrays for Synergistic Water Splitting.

In this study, we report a facile one-step chemical method to synthesize reduced titanium dioxide (TiO2) nanotube arrays (NTAs) with point defects. Treatment with NaBH4 introduces oxygen vacancies (OVs) in the TiO2 lattice. Chemical analysis and optical studies indicate that the OV density can be significantly increased by changing reduction time treatment, leading to higher optical transmission of the TiO2 NTAs and retarded carrier recombination in the photoelectrochemical process. A cathodoluminescence (CL) study of reduced TiO2 (TiO2-x) NTAs revealed that OVs contribute significantly to the emission bands in the visible range. It was found that the TiO2 NTAs reduced for a longer duration exhibited a higher concentration of OVs. A typical CL spectrum of TiO2 was deconvoluted to four Gaussian components, assigned to F, F+, and Ti3+ centers. X-ray photoelectron spectroscopy measurements were used to support the change in the surface chemical bonding and electronic valence band position in TiO2. Electron paramagnetic resonance spectra confirmed the presence of OVs in the TiO2-x sample. The prepared TiO2-x NTAs show an enhanced photocurrent for water splitting due to pronounced light absorption in the visible region, enhanced electrical conductivity, and improved charge transportation.

Impact of fin number and nanoparticle size on molten salt NanoPCM melting in finned annular space

Nanoenhanced phase change materials (NEPCMs) have attracted substantial interest in recent times due to their enhanced thermal properties and improved rates of heat transfer. When employed within a concentric enclosure, they exhibit remarkable potential for efficient and effective thermal energy storage, with applications spanning building insulation, electronics cooling, and solar energy storage. The aim of this study is to perform an extensive numerical investigation of the melting process of NEPCMs confined within a finned eccentric annulus, which serves as a representative model for thermal energy storage systems. The PCM considered is potassium nitrate that is dispersed with nanoparticles of Titanium dioxide, Aluminum oxide and single walled carbon nanotubes. An investigation has been conducted to assess the influence of different parameters, such as the number of fins, Rayleigh number, nanoparticle volume concentration, and nanoparticle size, on the phase change and heat exchange phenomena. The melting rate is found to be proportional to the number of fins and heat transfer enhancement of 56.86% is observed for eight finned case. The average melt fraction experiences a substantial increase of up to 35.35% when the particle volume fraction is increased to 4%. The decrease in particle size enhances the NEPCM melting fraction up to 46.03%.

Strontium-calcium doped titanium dioxide nanotubes loaded with GL13K for promotion of antibacterial activity, anti-Inflammation, and vascularized bone regeneration

Poor osseointegration and postoperative bacterial infections are the main causes of clinical failure of titanium (Ti) based implants. In this study, calcium (Ca) and strontium (Sr), which have osteogenic activity, were simultaneously introduced into titanium dioxide nanotubes (TN) in order to balance the potential cytotoxicity of GL13K (Antibacterial peptides), and a multifunctional Sr, Ca and GL13K-doped TN (SrCaTN-GL13K) coating was successfully constructed. The results showed that the SrCaTN-GL13K coating exhibited good mechanical properties, hydrophilicity, corrosion resistance and bioactivity. Sr2+, Ca2+ and GL13K could be continuously released from the coating and was pH-responsive. In addition, SrCaTN-GL13K showed good antibacterial properties against E. coli and S. aureus with antibacterial rates of approximately 70.32% and 70.78%, respectively. Cellular assays showed that RAW264.7 (immune), human umbilical vein endothelial cell (HUVEC, angiogenic) and mouse embryo osteoblast precursor cell (MC3T3-E1, osteogenic) exhibited good adhesion, survival and proliferation activities on the SrCaTN-GL13K coated surface. At both gene level and protein level, expression of anti-inflammatory markers (Interleukin-10, IL-10; mannose receptor, CD206), angiogenic markers (vascular endothelial growth factor, VEGF; platelet endothelial cell adhesion molecule-1, CD31) and osteogenic markers (alkaline phosphatase, ALP; runt-related transcription factor 2, RUNX2; human collagen type I, COL1a1; osteocalcin, OCN) were significantly upregulated in SrCaTN-GL13K coating. At the cellular and molecular level, SrCaTN-GL13K possessed the ability to induce RAW264.7 towards M2 polarization and it possessed the ability to induce HUVEC tube-formation; meanwhile, it exhibited the ability to induce MC3T3-E1 towards osteogenic differentiation. In conclusion, Ti implants exhibited improved antibacterial, anti-inflammatory, angiogenic, and osteoinductive capabilities by loading Sr, Ca, and GL13K to alter TN. In this study, a multifunctional modification of Ti surface was achieved by an economical and efficient method, which provides a new idea for the design of antimicrobial implantable devices with immunomodulatory functions in the clinic.

Correlation between TiO2 nanotubes thickness and their tribocorrosion performance in simulated body fluid solution

Titanium dioxide nanotubes (TNTs) have been extensively researched for their enhanced biomedical characteristics, including biocompatibility, cell apposition, and growth morphology. However, there is a significant concern in metallic medical devices owing to micro-movements between implants and bone in aggressive environments due to wear and corrosion synergies, leading to adverse body responses and implant failure. In this study, TNTs on Commercially Pure titanium (C.P. Ti) with three different thickness layers were grown to correlate their corrosion and wear behavior. Initially amorphous after anodization, TNTs underwent annealing at 450 °C for 2 h to transform the distorted, into a crystalline structure. The characterization included X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray (EDX), X-ray Photoelectron Spectroscopy (XPS), and contact profilometry. Potentiodynamic polarization (PD) and tribocorrosion tests were conducted in Simulated Body Fluid Electrolyte (SBF). SEM micrographs showed TNT thickness layers of 314, 691, and 5280 nm, and X-ray Diffraction showed anatase transformation post-annealing. Results confirmed a significant influence of TNT thickness layers on corrosion and tribocorrosion properties, with higher current density obtained from PD for thicker TNTs layers, associated with surface fluorine content. During tribocorrosion, annealed samples demonstrated lower corrosion tendency, potential drop, and coefficient of friction. Morphology of worn surfaces and volumetric wear rate varied with TNT thickness layer and thermal treatment.

Synergetic removal of Cr(VI) and dibutyl phthalate mixed pollutants on MoS2 sheet inserted in TiO2 nanotube under visible light

The challenge of developing stable and efficient photocatalysts for the simultaneous removal of heavy metals and organic pollution persists. Herein, molybdenum sulfide (MoS2) sheet inserted in porous-walled titanium dioxide nanotube arrays (TNTAs) with Z-scheme heterojunctions were synthesized via anodic oxidation and hydrothermal methods. The MoS2@p-TNTAs possess a robust response to visible light, with a large specific surface area and tight inter-semiconductor bonding. Notably, MoS2@p-TNTAs exhibited superior removal efficiencies in treating Cr(VI)-DBP mixed pollutants solution compared to individual pollutants. The degradation kinetic constants of Cr(VI) and DBP in the mixed pollutants were 8.3 and 3.3 times higher than those of single pollutants, respectively. The photodegradation efficiency of MoS2@p-TNTAs for DBP has consistently remained above 85 % even after undergoing 20 cycles, while the morphological structure remained stable, demonstrating outstanding structural stability and reusability. Mechanistic analysis revealed that the composites with Z-scheme heterojunctions exhibit a robust redox capability, while DBP and Cr were synergistically removed by consuming holes and electrons, respectively. Consequently, this study offers valuable insights into the potential application of TNTAs in wastewater treatment.

Surface and defect engineered polar titanium dioxide nanotubes as an effective polysulfide host for high-performance Li-S batteries

In this work, the surface structure of as received and ball milled (BM) titanium dioxide (TiO2) was modified via a simple hydrothermal method to create nanotubes (TiO2 NTs and TiO2 BM NTs) and subsequently chemically reduced to introduce widespread oxygen vacancy defects (TiO2-x NTs and TiO2-x BM NTs). The high surface area, innate polar nature, and high conductivity of TiO2 NTs allow the host material to effectively trap the lithium polysulfides both physically and chemically and improve the redox kinetics of lithium polysulfides. Chemical reduction acts to further improve the performance of the NTs by increasing the amount of polysulfides that can be adsorbed and by further increasing the conductivity of the material. Galvanostatic charge-discharge cycling testing revealed good performance for all four of the tested cathode hosts, with the best performance being achieved by TiO2 BM NTs and TiO2-x NTs, with the former delivering an initial discharge capacity of 1204.72 mAh g−1 at 0.1 C and 767.69 mAh g−1 at 3 C and the latter delivering an initial discharge capacity of 1005.24 mAh g−1 at 0.1 C, 353.7 mAh g−1 at 3 C, and a decay rate of −0.68% per cycle over the first 300 cycles at 3 C.

Synthesis of TiO2 nanotubes from ilmenite with CuS nanoparticles as efficient visible-light photocatalyst.

Titanium dioxide nanotube (TNT) is one of the most widely used photocatalysts. In this research, TNT was prepared by a facile method using ilmenite (FeTiO3) concentrate as the titanium source. For this purpose, iron was leached out from ilmenite using HCl in assistance with the iron powder as the reducing agent to produce pure TiO2, where consequently, TNT was produced through hydrothermal treatment of the prepared TiO2 in an alkaline solution. CuS quantum dots, using the L-cysteine as a linker, were coated on the TNT to improve TNTs' photocatalytic properties. Characterization was done using XRD, SEM, FESEM, HRTEM, FT-IR, nitrogen sorption, and band gap measurement. The results revealed the formation of TNT with a star-shaped macrostructure as well as, a good dispersion of uniform CuS quantum dots with an average diameter of a few nanometers on the TiO2 structure. A dye adsorption kinetics study of the TNT and CuS-dopped TNT showed that TNT carries a higher adsorption capacity compared to the CuS-dopped TNT, developed due to its higher surface area and pore volume. Next, the photocatalytic performance (under visible light) of the prepared composite was studied over the methylene blue (MB) and malachite green (MG) dyes, after the determination of the dye adsorption equilibrium point (where the adsorption stops). TNT showed almost no dye degradation while the prepared composite degraded almost 95 % of the dyes as the result of the reduced band gap from 3.21 to 2.67 eV. In this study, for the first time, the TNT was prepared using a mineral source and ilmenite, enhanced in photocatalytic properties, and presented a successful application.

Revealing the critical roles of silver species on TNT film for photocatalytic decomposition of volatile organic pollutants under UV or visible light irradiation: From mechanism study to scaled-up test

Ag nanoparticles are commonly employed as co-catalysts to promote photocatalytic reactions. In addition to their apparent roles as electron traps and catalytic active sites, nanoparticulate Ag can also generate hot electrons under visible light irradiation, which endows visible light photocatalytic activity to its supporting material. On the other hand, Ag0 can be easily converted to Ag2O, however, few studies focus on its formation and roles during the photocatalytic process. In this work, we have successfully fabricated and optimized the preparation procedures of titania nanotube (TNT) and Ag species deposited TNT to get the optimum photochemical activities of Ag modified TNT. Specifically, the roles of Ag species on TNT film have been investigated by photoelectrochemical (PEC) measurements and photocatalytic decomposition of volatile organic pollutants under UV or visible light irradiation. Toluene (30 ppm) can be effectively decomposed (∼83.3%) and mineralized (∼70.7%) by Ag species modified TNT in 3 h under UV–visible light irradiation, while the degradation and mineralization ratios are only about 60.0% and 33.3% under visible light irradiation. The results demonstrate that appropriate Ag/Ag2O ratio on TNT film are crucial for improving PEC and photocatalytic performance, and the interconversion between Ag and Ag2O influences the photochemical stability of Ag/TNT film. The scaled-up tests (∼1.0 m3 reactor) on the degradation of low concentration of toluene and formaldehyde prove that the optimized Ag/TNT film can be considered as a promising photocatalyst for indoor air purification.

Chitosan-coating strategies on the development of targeted chemodrug delivery nanosystem with titania nanotube arrays

Chitosan-coating strategies on the development of targeted chemodrug delivery nanosystem with titania nanotube arrays

Medical Implant Surface Technology: Geometrical Formation of Titania Nanotube Arrays by Divergence Anodization Parameters

Medical Implant Surface Technology: Geometrical Formation of Titania Nanotube Arrays by Divergence Anodization Parameters

Antifouling Behavior of Copper-Modified Titania Nanotube Surfaces.

Titanium and its alloys are commonly used to fabricate orthopedic implants due to their excellent mechanical properties, corrosion resistance, and biocompatibility. In recent years, orthopedic implant surgeries have considerably increased. This has also resulted in an increase in infection-associated revision surgeries for these implants. To combat this, various approaches are being investigated in the literature. One of the approaches is modifying the surface topography of implants and creating surfaces that are not only antifouling but also encourage osteointegration. Titania nanotube surfaces have demonstrated a moderate decrease in bacterial adhesion while encouraging mesenchymal stem cell adhesion, proliferation, and differentiation, and hence were used in this study. In this work, titania nanotube surfaces were fabricated using a simple anodization technique. These surfaces were further modified with copper using a physical vapor deposition technique, since copper is known to be potent against bacteria once in contact. In this study, scanning electron microscopy was used to evaluate surface topography; energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy were used to evaluate surface chemistry; contact angle goniometry was used to evaluate surface wettability; and X-ray diffraction was used to evaluate surface crystallinity. Antifouling behavior against a gram-positive and a gram-negative bacterium was also investigated. The results indicate that copper-modified titania nanotube surfaces display enhanced antifouling behavior when compared to other surfaces, and this may be a potential way to prevent infection in orthopedic implants.

Preparation of honokiol-loaded titanium dioxide nanotube drug delivery system and its effect on CAL-27 cells.

Background: Tongue cancer is the most common type of oral cancer, and patients have a poor prognosis and quality of life after conventional surgical treatment. Honokiol (HNK) is a kind of lignan extracted from Chinese herbal medicine Houpu, many domestic and international experiments have demonstrated its anti-tumor effect. Titanium dioxide nanotube (TNTs) is a kind of nanomaterial which can be used as drug carrier. The purpose of this study is to explore the effects of HNK-loaded TNTs delivery system (HNK-TNTs) on anti-tumor. Methods: TNTs were prepared by anodic oxidation method, and HNK was loaded onto TNTs by physical adsorption. The effect of HNK-TNTs on the proliferation, migration and apoptosis of CAL-27 cells were explored by CCK-8 experiment, scratch assay, live and dead staining and cellular immunofluorescence analysis. Results: The material characterization test results showed that we had successfully prepared HNK-TNTs. CCK-8 experiment, scratch assay showed that the proliferation and migration ability of CAL-27 cells were significantly weakened after treatment with HNK-TNTs, and their cell proliferation rates significantly decreased. Live/dead staining, cell immunofluorescence analysis showed that HNK-TNTs could promote CAL-27 cells apoptosis by increasing the expression levels of the apoptosis-related protein Bax and Fas. Conclusion: In this experiment, we had successfully prepared Honokiol-loaded titanium dioxide nanotube drug delivery system (HNK-TNTs) and compared the effects of single drug HNK and HNK-TNTs on the proliferation, apoptosis and migration of tongue cancer CAL-27 cells. This experiment showed that HNK-TNTs had greater anti-proliferative, apoptosis-promoting and migration-inhibiting effects than the HNK as a single drug.

Au nanoparticles decorated titanium dioxide nanotube arrays with enhanced photocatalytic dye degradation under ultraviolet and sunlight irradiation

The aim of this study is to show that the geometry of titanium dioxide (TiO2) nanotubes has an inevitable role in photocatalytic activity. The TiO2 nanotubes were synthesized by anodization technique. Au nanoparticles (AuNPs) were spin-coated onto the surface of these nanotubes. The photocatalytic activity study was conducted using methylene blue dye under UV light and sunlight. In contrast to the obtained results under UV light irradiation, the photocatalytic activity under sunlight irradiation of AuNPs-coated TiO2 nanotubes was much higher. The nanotubes showcased improved visible light absorption and photocatalysis under sunlight condition due to the SPR effect of AuNPs. Compared to other samples, the nanotubes prepared at 600 s (second) duration had an intrinsic geometry which exhibited high photocatalytic activity under sunlight irradiation. These results indicate that the maximum photocatalytic efficiency of TiO2 nanotubes can be achieved by carefully designing the nanotube geometry.

Low-cost synthesis of titanium dioxide nanotubes/reduced graphene oxide heterostructure for pH sensor applications

In this work, we deposit Graphene Oxide (GO) films on Titanium Dioxide nanotubes (TiO2NTs); electrochemical characterization of this system shows that this structure has potential applications as a pH sensor. TiO2NTs were obtained by electrochemical anodization technique, the GO was fabricated by modified Hummer's method, and deposited by dip coating technique, at room temperature. The thermally treated TiO2NTs/GO structure shows a reduction of the GO deposited film. The samples were characterized by Raman spectroscopy, X-ray Photoelectron Spectroscopy, and Scanning Electron Microscopy. Depending on the GO oxidation time and thermal treatment, we observe a uniform reduced GO film on the TiO2NTs. A pH electrode characterization shows a linear response of the TiO2NTs/GO of 57 mV/pH with non-hysteresis effect.

Ultrasonic-assisted of TiO2-MWCNT nanocomposite with advanced photocatalytic efficiency for elimination of dye pollutions

Nanocomposites of titanium dioxide (TiO2) and multi-wall carbon nanotubes (MWCNTs) were successfully synthesized (TiO2-MWCNTs) from MWCNTs and titanium tetrachloride (TiCl4) as starting precursors using ultrasonic-assisted technique. The impact of the different weight percentages of MWCNTs (1, 3, 5, and 7 wt%) on TiO2 optical, structural, and morphological properties were investigated. Subsequently, the photocatalytic activity was assessed by organic dyes degradation such as methylene Blue (MB) and rhodamine B (RhB) under ultraviolet (UV) light exposure. The characterization of synthesized materials demonstrated the anatase phase formation in both pure TiO2 and the TiO2-MWCNTs nanocomposite, according to X-ray diffraction analysis. The morphology analysis of TiO2-MWCNTs nanocomposites using FESEM and TEM confirmed the uniform dispersion of MWCNTs with an exterior diameter of 12–16 nm within the TiO2 matrix. The BET measurement of the sample's specific surface areas identified that the MWCNTs addition resulted in the increase of surface area from 76.34 to 194.35 m2 g−1 for pure TiO2 and TiO2/7 wt% MWCNTs, respectively. Furthermore, TiO2/7 wt% MWCNTs nanocomposite had lower optical bandgap energy and higher photocatalytic performance as compared to the pure TiO2. The photodegradation efficiency of TiO2/7 wt% MWCNTs nanocomposite increased from 63.63 % to 92.36 % for MB and 71.56 % to 94.13 % for RhB compared to pure TiO2, after 60 min UV light exposure.

Self‐trigger and on‐demand drug delivery system based on TiO2 nanotube arrays and its drug release behaviour

AbstractThe foundation of drug delivery systems based on titanium dioxide nanotube arrays has become an important means to increase the drug release performance of bone implantation materials. However, most of the conventional platforms have some disadvantages, such as large sudden release, uncontrollable, unintelligent, or not on‐demand drug release process. Herein, the authors develop a unique self‐triggering drug release system (SDDS), utilizing the advantages of 1‐Tetradecanol (TD), such as decent biocompatibility, a phase transition temperature of 37.8°C, and the inexistence of complex chemical reaction process. The establishment of the platform can make a large amount of the anti‐inflammatory drug (ibuprofen, IBU) released when the body or the affected area is inflamed, that is, when the temperature rises. Conversely, only a small amount or no drug is released when there is no inflammation, thereby achieving self‐trigger release and on‐demand release. The experimental results show that the system combines good self‐trigger release properties, release sensitivity, drug release cycle, and low selectivity to the loaded drugs.

Double shelled titanium dioxide@mesoporous organosilica nanotube as an amphiphilic photoactive nanoreactor for efficient photocatalytic oxidation of styrene

In this work, we have proposed a strategy to fabricate double-shell nanotubes as amphiphilic photoactive nanoreactors (HTTBPC) through the ordered hybridization of mesoporous organosilicon (PMO) and titanium dioxide (TiO2) nanotubes. Unlike the previous rough composite, the heterogeneous structure established between cobalt-porphyrin functionalized PMO and conventional TiO2 has a staggered matching band gap, which makes it have excellent light harvesting and high carrier separation ability. This is still unexplored. Interestingly, the prepared photocatalysts exhibited superior activity (99%) and benzaldehyde selectivity (94%) in the oxidation of styrene in water at room temperature, which was 3.8 and 2.8 times higher than that of TiO2 nanotubes and PMO functionalized with cobalt porphyrin, respectively. It was demonstrated that the strong interaction between cobalt porphyrin PMO and TiO2 improved the separation of photogenerated carriers and the amphiphilic properties of mesoporous organosilica boosted the adsorption of substrate molecules in water, contributing to the significantly enhanced photocatalytic activity. This work provides a design of high-performance photocatalysts for alkene oxidation under green conditions.