Nanomaterials
·
2018
·Vol. 8
·期 2
·127
·
IF 3.504
Sen Lin,Shiyong Sun,Ke Wang,Kexuan Shen,Biaobiao Ma,Yuquan Ren,Xiaoyu Fan
The bioinspired design and construction of enzyme@capsule microreactors with specific cell-like functionality has generated tremendous interest in recent years. Inspired by their fascinating complexity, scientists have endeavored to understand the essential aspects of a natural cell and create biomimicking microreactors so as to immobilize enzymes within the hierarchical structure of a microcapsule. In this study, simultaneous encapsulation of alcohol dehydrogenase (ADH) was achieved during the preparation of microcapsules by the Pickering emulsion method using amphiphilic modified TiO2nanoparticles (NPs) as building blocks for assembling the photocatalytic microcapsule membrane. The ADH@TiO2NP microreactors exhibited dual catalytic functions, i.e., spatially confined enzymatic catalysis and the membrane-associated photocatalytic oxidation under visible light. The sustainable cycling of nicotinamide adenine dinucleotide (NAD) coenzyme between NADH and NAD+was realized by enzymatic regeneration of NADH from NAD+reduction, and was provided in a form that enabled further photocatalytic oxidation to NAD+under visible light. This bioinspired ADH@TiO2NP microreactor allowed the linking of a semiconductor mineral-based inorganic photosystem to enzymatic reactions. This is a first step toward the realization of sustainable biological cycling of NAD+/NADH coenzyme in synthetic functional microsystems operating under visible light irradiation.Keywords:enzyme encapsulation;bioinspired microreactors;nicotinamide coenzymes cycling;alcohol dehydrogenase;TiO2nanoparticles
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 15
·7186-7198
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IF 2.302
Zhang Luanluan,Du Jia,Ran Ting,Gao Hejun,Liao Yunwen
A novel composite material PIL@TiO 2 was synthesized by sol–gel method using zwitterionic ionic liquid (1-(3-sulfonic group) propyl-3-ethylimidazole). TiO 2 was uniformly loaded on PIL (poly(1-(3-sulfonic group) propyl-3-ethylimidazole)). The large specific surface area, unique microspore structure, negative effect, and synergistic effect were caused by PIL. PIL@TiO 2 can effectively improve the separation efficiency of the electron–hole photogeneration. The electron–hole pair and · OH play an important role in the photo-degradation. The structure of dye molecule is also an influencing factor for the degradation capacity. After five cycle experiments, PIL@TiO 2 still exhibited excellent photocatalytic efficiency to dye molecules and its photocatalytic efficiency is better than that of P-25 (nanoscale TiO 2 ) in the methyl orange and Rhodamine B solutions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Shenhua Pan,Huan Yao,Yu Wen,Yue Liu,Xiaoqiang Fan,Liang Wu,Zhi-Hui Xie
ZnAl-LDH was deposited on TiO 2 nanotube to form a composite heterojunction. • The heterojunction facilitates the transfer of electrons to the Mg/Ni couple. • The composite shows low potential and high current compared to undoped TiO 2 . • The heterojunction effectively delays the galvanic corrosion of the Mg/Ni couple. To address the intrinsically poor visible-light response of conventional TiO 2 semiconductor and the severe galvanic corrosion of nickel-plated magnesium alloy (Mg/Ni), a ZnAl-layered double hydroxide (ZnAl-LDH)–modified TiO 2 composite photoanode (LDH/TiO 2 ) was rationally designed for photogenerated cathodic protection of Mg/Ni electrode. The in-situ deposition of ZnAl-LDH onto the TiO 2 nanotube arrays constructs a heterointerface that enhances visible-light harvesting and promotes the separation and directional transport of photogenerated charge carriers. Under visible-light irradiation, the LDH/TiO 2 photoanode efficiently injects photogenerated electrons into the Mg/Ni alloy, resulting in a pronounced negative shift in the photoinduced potential and thus suppressing galvanic corrosion. Electrochemical analyses reveal that the LDH/TiO 2 composite exhibits a lower photoinduced potential, higher photocurrent density, and reduced interfacial charge-transfer resistance compared with unmodified TiO 2 nanotube photoanodes, confirming the synergistic effect of LDH modification on charge-transfer kinetics and photogenerated cathodic protection efficiency. This study presents a mechanistically guided approach for constructing high-performance photoanodes for the photogenerated cathodic protection of magnesium alloys.
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Journal of Ocean University of China
·
2019
·Vol. 18
·期 5
·1130-1138
·
IF 0.699
Liu Jie,Yin Pinghe,Zhao Ling
Recently, the widespread use of TiO 2 nanoparticles (nano-TiO 2 ) has attracted the global concern regarding their adverse effects to aquatic organisms. Nanoparticles may get to the aquatic environments and harm the growth of algae. This paper presents the studies of nano-TiO 2 concentrations influence on the photosynthetic characteristics, antioxidant system and antitumor activity of marine macroalgae Gracilaria lemaneiformis after exposed to 0, 5, 10, 20 or 40 mg L -1 of nano-TiO 2 . Results showed that the photosynthetic pigment content of G. lemaneiformis obviously decreased and the antioxidant defense system was significantly disturbed after exposure to nano-TiO 2 . Compared with control, the maximum level of malondialdehyde showed 3.3-fold increase for 15 days exposure to nano-TiO 2 . The activity of superoxide dismutase and catalase enhanced obviously by 1.10–2.24-fold. The aqueous extract of G. lemaneiformis (AEGL) possesses anticancer activity against HepG2 liver cancer cells proliferation and the 48 h-cell inhibition exceeds 35%. But the toxicity of nano-TiO 2 would inhibit the anticancer activity of AEGL. When G. lemaneiformis was exposed to nano-TiO 2 , the effect of the aqueous extract of G. lemaneiformis on the cell inhibition, reactive oxygen species production, apoptosis, cycle arrest of HepG2 cells significantly lessened, and which were linearly associated with nano-TiO 2 exposure concentration. Those results further confirmed that nano-TiO 2 can inhibit the anticancer activity of G. lemaneiformis . The results in this work imply that macroalgae can be an effective biomarker of nano-TiO 2 contaminant, and can be useful indicator to evaluate ecological effects of increasing pollutants in marine ecosystem.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
·
IF 9.2
Litao Li,Ran Shi,Zhikun Wang,Tong Zhou,Bo Li,Minghui Shi,Tianwei He,Zhili Peng,Qingju Liu
Photothermal NP-CDs/TiO 2 enabled H 2 evolution in recoverable PAN membranes. • Recyclable NP-CDs/TiO 2 /PAN nanofiber membranes were electrospun. • NP-CDs broaden TiO 2 light absorption and enhance photothermal conversion. • TC-3/PAN retains 92.2% activity after seven cycles over 28 h. Photothermal synergistic catalysis holds great promise for solar hydrogen production. Nevertheless, the separation and recycling of powder photocatalysts remain critical challenges for practical implementation. In the present investigation, nitrogen-doped polydopamine-derived carbon dots (NP-CDs) with pronounced photothermal effects were introduced into a TiO 2 -based photocatalytic hydrogen evolution system. The resulting composites were further immobilized onto polyacrylonitrile (PAN) membranes via electrospinning to construct a recyclable NP-CDs/TiO 2 /PAN (TC-3/PAN) nanofiber membrane. The introduction of NP-CDs extended the optical response region of TiO 2 and substantially enhanced its photothermal conversion capability. The optimized TC-3/PAN membrane reached a temperature of 58.3 °C under illumination and achieved a hydrogen evolution rate of 4.66 mmol/m 2 /h, corresponding to an 8.8 times enhancement relative to pristine TiO 2 /PAN. Moreover, TC-3/PAN retained 92.2% of its initial activity after seven cycles over 28 h, demonstrating excellent stability and recyclability. These findings offer a practical route for developing recyclable membrane-based photothermal catalytic systems. Download: Download high-res image (560KB) Download: Download full-size image
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MATERIALS LETTERS
·
2021
·
IF 3.423
Hong Wang,Zhongying Liu,Yihai Zhou,Renchun Yang
In this paper, P O was grafted on the surface of rutile TiO 2 by one-step hydrothermal method . Due to the presence of the highly electronegative oxygen element, the surface of TiO 2 often presented an electron-deficient state, which limited its application in reduction reactions. Herein, the low electronegativity element P from the phosphate was grafted on the surface of TiO 2 to form a P O structure, which changes the electronic equilibrium state of the TiO 2 and provide a new channel for electron migration. The surface of TiO 2 presented an electron-enrich structure, which promoted the best hydrogen production performance around 28 mmol·g −1 ·h −1 on TiO 2 -P-0.01.
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INTERNATIONAL BIODETERIORATION & BIODEGRADATION
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2021
·
IF 4.32
Xiao Zhou,Min Zhou,Shengjun Ye,Yanbin Xu,Shaoqi Zhou,Qiujie Cai,Guangyan Xie,Lu Huang,Li Zheng,Yuxin Li
The antibacterial activity and mechanism of reduced graphene oxide (rGO)-modified TiO 2 were assessed against Enterobacter hormaechei in this study. The rGO-modified TiO 2 exhibited an enhanced antibacterial activity against E. hormaechei under UV–Visible light irradiation compared with individual TiO 2 or rGO alone. Its effectiveness owed to the synergistic effect of the improved adsorption and the lower recombination of photo-induced electron–hole pairs. The hybrid photocatalyst improved charge separation and chemical binding activity that contributed to accelerated antibacterial process. The flow cytometry results showed that the hybrid photocatalyst reduced the survival ratio of E. hormaechei to about 10% with 90 min under visible light illumination. The XPS spectra and SEM micrographs indicated a direct physical contact and disruptive interaction between the bacteria and the rGO-TiO 2 catalyst, mostly on rGO, resulting in oxidizing a vital cellular structure. EPR measurement revealed that hydroxyl radicals were the dominant active species that can cause the peroxidation of lipids in the outer cell wall and the damage of cell organelles and components inside the bacteria, which is the key mechanism for this antibacterial process. Overall, this study indicated that rGO-modified TiO 2 nanocomposite has great potential as an economical, environmentally friendly and easily available antibacterial material for antibacterial.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 5
·4138-4145
·
IF 1.798
Yu Mei,Meng Yanbing,Zhang Jindan,Liu Jianhua,Li Songmei
Super helical Au/TiO 2 nanocomposites were synthesized using plasmid DNA and incorporated into photoanode of dye-sensitized solar cells (DSSCs). The performance of photoanode films and DSSCs was investigated. Plasmid DNA can not only support as bio scaffold to synthesize Au/TiO 2 nanocomposites, but also act as an effective reducing agent under ultraviolet (UV) irradiation. Compared with TiO 2 -only DSSCs, the light harvesting (LH), corresponding photocurrent and power conversion efficiency (PCE) of DSSCs were enhanced by incorporating of mechanically mixed Au-TiO 2 NPs and Au/TiO 2 nanocomposites. Compared to the TiO 2 -only DSSCs samples (5.12%), the PCE of DSSCs with mechanically mixed Au-TiO 2 nanoparticles (NPs) (6.41%) increased by 25.20%, and DSSCs with Au/TiO 2 nanocomposites (8.17%) increased by 59.57%. The best PCE (8.24%) of DSSCs was obtained with the incorporation of Au/TiO 2 nanocomposites. Two reasons were presented for the best performance of DSSCs with Au/TiO 2 nanocomposites. Firstly, the localized surface plasmon resonance (LSPR) effect of Au NPs enhanced the absorption visible light. Secondly, the super helical structure of Au/TiO 2 nanocomposites provided a path for the transmission of photoelectrons.
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Journal of CO2 Utilization
·
2018
·
IF 5.503
Zhengfeng Huang,Peimei Dong,Yanzhao Zhang,Xiaoxiao Nie,Xiya Wang,Xiwen Zhang
A strategy of coupling a photocatalyst with a high CO 2 adsorption capacity material was proposed in order to integrate CO 2 capture and photoreduction processes into a single system. TiO 2 and ZIF-8 were selected for their high photoactivity and CO 2 adsorption capacity respectively. We employed a facile in-situ growth strategy to inlay ZIF-8 into the TiO 2 film grid. X-ray diffraction and scanning electron microscopy revealed that ZIF-8 was successfully prepared and inlaid into the TiO 2 film. X-ray photoelectron spectroscopy and photoluminescence spectra suggested that the TiO 2 and ZIF-8 were coupled by chemical bonding. The ZIF-8 decorated TiO 2 film exhibited excellent CO 2 capture capacity and showed remarkably enhanced yield for reducing CO 2 to CO and CH 4 when compared with pure TiO 2 film. The probable mechanism of the photoreduction process is also discussed.
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Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Yuzhen Liao,Zhi Zhou,Sheng Dai,Lang Jiang,Ping Yang,Ansha Zhao,Lei Lu,Jiang Chen,Nan Huang
Titanium dioxide (TiO 2 ) is a widely used biomaterial. It is a great challenge to confer antibacterial and antithrombotic properties to TiO 2 while maintaining its cell affinity. Here, we developed a new strategy to achieve the above goal by comprehensively controlling the chemical cues and geometrical cues of the surface of TiO 2 . Using colloidal etching technology and UV irradiation treatment, we obtained the photofunctionalized nano-micro-honeycomb structured TiO 2 . The honeycomb structured increased the photocatalytic activity of TiO 2 , which endowed TiO 2 with photo-induced superhydrophilicity to inhibit bacterial adhesion. The high photocatalytic activity also induced the strong photocatalytic oxidation of TiO 2 surface organic adsorbates to suppress fibrinogen and platelet attachment. In addition, owing to the micropore trapping-isolation effect on the bacteria and the nano-frames' contact guidance effect on the growth and spreading of platelet pseudopods, the honeycomb structure also shows a considerable inhibiting effect on bacterial and platelet adhesion. Therefore, due to the controlled chemical and geometrical cues' synergistic effect, the photo-functionalized TiO 2 honeycomb structure shows excellent bacterial-adhesion resistance and antithrombotic properties. More importantly, the photo-functionalized TiO 2 honeycomb did not inhibit the adhesion and growth of endothelial cells (ECs) after culturing for 3 d, indicating a good cell affinity that the traditional antifouling surfaces do not possess.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tarek A. Gad-Allah,Ruiyang Zhang,Yi Wang,Ying Zhou
Various factors control the photocatalyst efficiency including the lifetime of photogenerated charge carriers, photocatalyst surface energy, and light harvesting efficacy. In this study, the defective (001)-TiO 2 -x/h-BN composite was synthesized by a facile one-pot method to merge the fantastic features of the reactive metastable (001) facet and self-defects in TiO 2 anatase crystals with the 2D h-BN. Pure anatase phase of TiO 2 was obtained by the suggested preparation method, which contains ∼33 % of the exposed (001) facet. The predominancy of oxygen vacancy in TiO 2 crystals was proved experimentally and theoretically by the DFT calculations. The defects in TiO 2 along with the incorporated h-BN caused better light harvesting and longer charge lifetime. The prepared defective (001)-TiO 2 -x/h-BN was applied efficiently for NO removal with very limited release of the toxic NO 2 by-product as an environmental application. The detected oxygen vacancy in TiO 2 along with h-BN were found to play a synergistic enhancement for NO removal. However, more defects reduced the overall activity because of rapid oxidation of oxygen vacancies on surface of the photocatalyst. To sum up, the defective (001)-TiO 2 -x/h-BN composite can be considered as a promising material for environmental applications.
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BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Zhenfei Gao,Liqiang Zhang,Chi Ma,Qidong Zhou,Yushu Tang,Zhiqiang Tu,Wang Yang,Lishan Cui,Yongfeng Li
TiO 2 modified Co 3 O 4 acicular nanotube arrays (ANTAs) have been fabricated in this study, showing a good performance in glucose detection. In the experiment, the precursor Co(CO 3 ) 0.5 (OH)·0.11H 2 O acicular nanowire arrays (ANWAs) was first grown on the fluorine doped tin oxide (FTO) substrate by a hydrothermal method . Thereafter, the uniform pink precursor Co(CO 3 ) 0.5 (OH)·0.11H 2 O ANWAs was completely converted to the black Co 3 O 4 ANTAs thin film by alkaline treatment . After the decoration of TiO 2 , the TiO 2 /Co 3 O 4 ANTAs electrode exhibits a much higher current response to glucose compared with the Co 3 O 4 ANTAs. Importantly, this neotype composite structure of Co 3 O 4 enhances the glucose sensing performance by increasing specific surface area, additional reactive sites and synergistic effect , which make the TiO 2 /Co 3 O 4 glucose sensor show a high sensitivity of 2008.82 μA mM −1 cm −2 , a fast response time (less than 5 s) and a detection limit as low as 0.3396 μM (S/N=3). The TiO 2 /Co 3 O 4 ANTAs modified electrode exhibits a high selectivity for glucose in human serum, against ascorbic acid and uric acid .
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