Materials Today Energy
·
2023
·
IF 9.3
Man Zhou,Suting Xue,Qin Feng,Xuan Liang,Wangchen Wu,Yanli Zhou,Minmin Ni,Xudong Zheng,Song Xu,Jin Zhao,Zhongyu Li
Noble metal nanoparticles (NMNPs) modified semiconductors play important roles in heterogeneous catalysis . However, for the ultra-small NMNPs (<5 nm) on TiO 2 , the problems of easy agglomeration and quick deactivation highlight the need for highly efficient protection of ultra-small NMNPs. Here, we introduce a novel structure of carbonized liquid crystals (CLCs) protected Pt NPs on TiO 2 , which involves in-situ photo-reduction of chloroplatinic acid to ultra-small Pt NPs in lamellar liquid crystals. According to the results of morphological structures, CLCs changed the contact type of Pt/TiO 2 from ‘face-contact’ to ‘point-contact’, which was consistent with our simulation results. Compared with the bare Pt/TiO 2 , the visible-light photocatalytic H 2 production rate of C–Pt/TiO 2 exhibited 1.75-fold enhancement under the protection of CLCs (26.73 mmol g −1 h −1 vs. 15.26 mmol g −1 h −1 ). Especially, the marriage of CLCs and the traditional Pt/TiO 2 photocatalyst achieved long-term stability, which remained 87% of the original rate at the sixth cycle.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3396
·
IF 4.6
Yawen Cui,Xudong Zheng,Tongtong Xu,Biao Ji,Jinfeng Mei,Zhongyu Li
Due to the increasingly serious problem of offshore oil spills, research related to oil–water separation has attracted more and more attention. Here, we prepared a super-hydrophilic/underwater super-oleophobic membrane (hereinafter referred to as BTA) using poly-dopamine (PDA) to adhesive TiO2nanoparticles on the surface of bacterial cellulose, coated with sodium alienate by vacuum-assisted filtration technique. This demonstrates its excellent underwater super-oleophobic property. Its contact angle is about 153°. Remarkably, BTA has 99% separation efficiency. More importantly, BTA still showed excellent anti-pollution property under ultraviolet light after 20 cycles. BTA has the advantages of low cost, environmentally friendliness and good anti-fouling performance. We believe it can play an important role in dealing with problems related to oily wastewater.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1479-1486
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IF 2.8
Liu Yang,Chen Han,Lou Xiaoming,Wen Xiaoyu,Yin Zhenguo,Xiang Kaixiong
Rechargeable aqueous ammonium-ion batteries (AAIBs) have attracted more and more attention in energy storage devices because of great safety and cost-effectiveness, as well as excellent rate capability. Recently, it is the main exploration focus for the further improvement of AAIBs to develop suitable electrode materials. Herein, titanic acid and TiO 2 were simply synthesized by the facile co-precipitation approach. Titanic acid showed higher capacity of 104.5 mAh g −1 at the 0.1 A g −1 current density, and higher cyclability with the 91.2% capacity retention cycled 1000 cycles at 1 A g −1 . Titanic acid is promising as aqueous ammonium-ion batteries with great stability and capacity.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 15
·6743-6756
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IF 4.5
Zhou Huan,Wang Jie,Yang Bing,Sun Manna,Liang Chunyong,Yang Lei,Zhao Xiaoyan,Wang Hongshui
In this work, near-infrared light responsive upconversion nanoparticles TiO 2 /(Ca,Y)F 2 :Tm,Yb were hydrothermally prepared for tumor control. Moreover, femtosecond laser was adopted to reduce particle size and aggregation of TiO 2 /(Ca,Y)F 2 :Tm,Yb, as a strategy to enhance its dispersity. In vitro studies of the biocompatibility and tumor control efficacy of TiO 2 /(Ca,Y)F 2 :Tm,Yb were carried out via co-culturing human pancreatic carcinoma cells (CFPAC-1). It was found in the absence of near-infrared light, TiO 2 /(Ca,Y)F 2 :Tm,Yb showed no toxicity to CFPAC-1 cells. On contrast, when exposed to near-infrared light, particles exhibited irradiation time, irradiation interval and particle concentration dependent suppression of CFPAC-1 cells proliferation along with portion of S phase cells increase. A nude mouse model with CFPAC-1 cells injection was established and TiO 2 /(Ca,Y)F 2 :Tm,Yb was subsequently applied for in vivo tumor control. A 15 days tracking confirmed the antitumor capability of near-infrared light excited TiO 2 /(Ca,Y)F 2 :Tm,Yb. Overall, we anticipate that the here-introduced TiO 2 /(Ca,Y)F 2 :Tm,Yb can serve as an effective agent for photodynamic antitumor therapy. Graphical Abstract
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CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Lei Xia,Yi Lu,Yuan-Zhou Li,Zhi-Yi Hu,Xiao-Yu Yang
Photocatalytic hydrogen production from seawater has great prospects for generating clean energy from renewable resources. We designed a TiO 2 -rGO-Cu photocatalyst that possesses a pathway for directed electron transfer from nitrogen-doped TiO 2 to rGO and then to Cu nanoparticles, which leads to efficient electron-hole pairs separation. Results show that TiO 2 -rGO-Cu has a hydrogen production rate of 16.08 mmol h −1 g −1 in simulated seawater, which is as much as 25 times higher than that of TiO 2 . The mechanism for a highly efficient directional interfacial electron transport is proposed. The strategy could be effective for designing new photocatalysts for hydrogen production from seawater.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Shengliang Wang,Haixu Chen,Zhijun Xu,Xiaoliang Wang,Zhengyu Tao,Lei Wang,Xiaoman Liu,Xin Huang
Cell surface engineering is an effective strategy to improve the tolerance of living cells against harsh environments as well as endow cells with various properties and functionalities, which they do not possess inherently. However, the research emphasis on single-cell surface engineering with the emergence of collective functionality is still rare. In this study, we encapsulate a single living cell with TiO2 nanoparticles (Degussa P25, composed of anatase and rutile crystallites) and conductive polymer polypyrrole (PPy). The driving force generated from the nanoparticles TiO2 and PPy could be utilized to manipulate cells that are more than a hundred times their own body size. Different collective behaviors of unicellular organisms can be achieved under various conditions. Especially, the engineered cells could be endowed with a swarming negative phototaxis migration under UV light in the presence of ferrocene methanol (MFc). Given that the collective behaviors of organismic swarms can greatly improve the adaptability and survivability compared to individual ones, we thus anticipate that such a studied technique could open up opportunities for the manipulation of the collective behaviors of unicellular organisms and have great potential in cell therapy as well as biosensors.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Liwen Qiang,Nan Zhao,Kaizhen Liao,Xichao Sun,Qiang Wang,Hangbiao Jin
Engineered nanoparticles (ENPs) can resist heavy metal toxicity in plants, but their coexposure still exhibits toxicity to plants compared to plants without exposure to ENPs and heavy metals. There have been few studies on the toxic mechanism of nano TiO 2 -heavy metal coexposure and the effect mechanism of nano TiO 2 in plants. Thus, transcriptomics and metabolomics were used to study the toxic mechanism of rutile nano TiO 2 or TiO 2 -Cd (rutile nano TiO 2 and CdCl 2 mixture) on rice ( Oryza sativa L.). After 40 days of exposure, the plant height and root dry weight of rice were significantly decreased in the nano TiO 2 -Cd group compared to the blank group (nano TiO 2 and CdCl 2 free). After Cd treatment, 423 differentially expressed genes (DEGs) and 16 differential metabolites were identified. Nano TiO 2 exposure induced significant regulation of 299 DEGs and 6 metabolites. After nano TiO 2 -Cd coexposure, 1660 DEGs and 181 differential metabolites were identified. Notably, the EDGs (e.g., chalcone isomerase and hydroxycinnamoyl transferase) and differential metabolites (e.g., chrysin and galangin) demonstrated the disruption of flavonoid biosynthesis in Cd-treated rice. After rice was exposed to nano TiO 2 , the DEGs were related to ribosome, whereas the differential metabolites were associated with pyruvate metabolism and valine, leucine , and isoleucine biosynthesis. Furthermore, 14 DEGs (e.g., asparaginyl-tRNA synthetase and methionyl-tRNA formyltransferase) involved in aminoacyl-tRNA biosynthetic pathways were significantly upregulated in rice treated with nano TiO 2 -Cd, in line with the changes in related metabolites (e.g., L -asparagine and 10-formyltetrahydrofolate). Our results show that it is necessary to pay close attention to the toxicity of nano TiO 2 -Cd coexposure in paddy ecosystems and use ENPs with caution to combat the phytotoxicity of heavy metals.
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高影响因子
Advanced Energy and Sustainability Research
·
2023
·Vol. 4
·期 7
·2300002
·
IF 5.8
Gang Cheng,Shuo Li,Chunyan Wang,Jinyan Xiong
TiO 2 –based photocatalysis system for splitting water into hydrogen offers a sustainable and green technology to produce clean hydrogen energy. However, pristine TiO 2 still exists inherent shortcomings restricting its practical applications. Herein, the impact of postprocessing approaches of protonic titanate on engineering of oxygen vacancy and photocatalytic hydrogen evolution of TiO 2− x is studied. Subsequently, interfacial cocatalysts are successfully involved in the optimized TiO 2− x for enhanced photocatalytic hydrogen evolution. TiO 2− x with the highest photocatalytic hydrogen evolution performance of 3112.09 μmol g −1 h −1 , denoted as TiO 2 –C, is selected to adjust the interface with Cu and MoS 2 respectively. Cu–TiO 2 –C and MoS 2 –TiO 2 –C composites are synthesized to enhance the separation ability of photogenerated electron-hole pairs and significantly improve the photocatalytic hydrogen evolution performance. The photocatalytic hydrogen evolution rates of 5 wt% Cu–TiO 2 –C and 40 wt% MoS 2 –TiO 2 –C are 9225.75 and 5765.48 μmol g −1 h −1 , respectively. It is proved that different postprocessing methods can tune the content of oxygen vacancy in TiO 2− x and regulate the photocatalytic hydrogen evolution performance of TiO 2− x materials. The interface regulation of the cocatalyst also contributes to the separation of photogenerated electron-hole pairs and serves as active sites to enhance hydrogen evolution performance.
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Biomaterials Advances
·
2023
·
IF 0
Wenfu Ma,Xuhui Liu,Minhui Yang,Qingxiang Hong,Lingjie Meng,Qiuyang Zhang,Jie Chen,Changjiang Pan
Although the construction of nanotube arrays with the micro-nano structures on the titanium surfaces has demonstrated a great promise in the field of blood-contacting materials and devices, the limited surface hemocompatibility and delayed endothelial healing should be further improved. Carbon monoxide (CO) gas signaling molecule within the physiological concentrations has excellent anticoagulation and the ability to promote endothelial growth, exhibiting the great potential for the blood-contact biomaterials, especially the cardiovascular devices. In this study, the regular titanium dioxide nanotube arrays were firstly prepared in situ on the titanium surface by anodic oxidation, followed by the immobilization of the complex of sodium alginate/carboxymethyl chitosan (SA/CS) on the self-assembled modified nanotube surface, the CO-releasing molecule (CORM-401) was finally grafted onto the surface to create a CO-releasing bioactive surface to enhance the biocompatibility. The results of scanning electron microscopy (SEM), X-ray energy dispersion spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) revealed that the CO-releasing molecules were successfully immobilized on the surface. The modified nanotube arrays not only exhibited excellent hydrophilicity but also could slowly release CO gas molecules, and the amount of CO release increased when cysteine was added. Furthermore, the nanotube array can promote albumin adsorption while inhibit fibrinogen adsorption to some extent, demonstrating its selective albumin adsorption; although this effect was somewhat reduced by the introduction of CORM-401, it can be significantly enhanced by the catalytic release of CO. The results of hemocompatibility and endothelial cell growth behaviors showed that, as compared with the CORM-401 modified sample, although the SA/CS-modified sample had better biocompatibility, in the case of cysteine-catalyzed CO release, the released CO could not only reduce the platelet adhesion and activation as well as hemolysis rate, but also promote endothelial cell adhesion and proliferation as well as vascular endothelial growth factor (VEGF) and nitric oxide (NO) expression. As a result, the research of the present study demonstrated that the releasing CO from TiO 2 nanotubes can simultaneously enhance the surface hemocompatibility and endothelialization, which could open a new route to enhance the biocompatibility of the blood-contacting materials and devices, such as the artificial heart valve and cardiovascular stents.
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ACS Omega
·
2023
·
IF 4.1
Binbin Chen,Weiwei Lu,Peng Xu,Kaisheng Yao
The photocatalytic degradation of pollutants is an effective and sustainable way to solve environmental problems, and the key is to develop an efficient, low-cost, and stable photocatalyst. Polymeric potassium poly(heptazine imide) (K-PHI), as a new member of the carbon nitride family, is a promising candidate but is characterized by a high charge recombination rate. To solve this problem, K-PHI was in-situ composited with MXene Ti3C2-derived TiO2 to construct a type-II heterojunction. The morphology and structure of composite K-PHI/TiO2 photocatalysts were characterized via different technologies, including TEM, XRD, FT-IR, XPS, and UV–vis reflectance spectra. Robust heterostructures and tight interactions between the two components of the composite were verified. Furthermore, the K-PHI/TiO2 photocatalyst showed excellent activity for Rhodamine 6G removal under visible light illumination. When the weight percent of K-PHI in the original mixture of K-PHI and Ti3C2 was set to 10%, the prepared K-PHI/TiO2 composite photocatalyst shows the highest photocatalytic degradation efficiency as high as 96.3%. The electron paramagnetic resonance characterization indicated that the·OH radical is the active species accounting for the degradation of Rhodamine 6G.
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高影响因子
DESALINATION
·
2023
·
IF 9.9
Jiawei Fu,Hang Xu,Tao Lin,Ao Wang,Anqi Wang,Chen Yao,Weihang Chen,Mingmei Ding,Chunxia Geng,Li Gao
Thin-film composite (TFC) nanofiltration (NF) membrane having excellent permeability and desired rejection is needed for water reuse and desalination . However, it remains a tremendous challenge to boost permeability while sustaining the rejection of the membrane. Herein, a novel TFC NF membrane possessing a thin and crumpled polyamide (PA) selective layer was fabricated using heterostructural MXene-TiO 2 as interlayer through a conventional interfacial polymerization (IP) reaction. The heterostructural MXene-TiO 2 was obtained by the in situ MXene oxidation with peroxymonosulfate (PMS), which effectively regulated the nanostructure of the interlayer and avoided the over-stacking of the nanosheets , promoting the rapid transport of water molecules. Moreover, the large specific area and numerous edges of MXene-TiO 2 boosted the adsorption and release of amine monomers on the substrates, facilitating the crumpled structure formation. In this way, the obtained membrane with 30.25 nm in thickness achieved a 98.29 % rejection for MgSO 4 and an enhanced water permeance of 11.10 L m −2 h −1 bar −1 , about 2.5 times that of TFC 0 NF membrane. Our work presents a novel approach of feasibility to engineer a TFC NF membrane with outstanding performance for water treatment .
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Ranran Yuan,Cailiang Yue,Jinli Qiu,Fuqiang Liu,Aimin Li
TiO 2 @NH 2 -MIL-88B(Fe) heterostructures (TMFe-x) were successfully synthesized and used in an efficient sunlight-driven reduction towards Cr(VI) in a neutral aqueous media. Further, the prepared TMFe-x heterostructures exhibited higher photocatalytic activity when compared with those exhibited by pure TiO 2 and NH 2 -MIL-88B(Fe) under simulated sunlight irradiation. The optical TiO 2 modification content was determined to be 10 wt.% (TMFe-b), with 98.6% Cr(VI) being converted to Cr(III) within 35 min using ammonium oxalate as the hole scavenger at pH = 7. In neutral conditions, the kinetic rate constant (0.0878 min −1 ) was five times larger than the published values. Additionally, the photocatalytic performance of TMFe-b was maintained and Fe leaching was observed to be negligible after the completion of four reaction cycles. The superior photocatalytic property can be attributed to the high photoelectron-hole separation and migration efficiency. Subsequently, TMFe-b achieved Cr(VI) reduction under neutral conditions by capturing hydrogen from the water molecules or the hole scavengers. The photoelectrons and superoxide radicals were the main active species. Furthermore, TMFe-b was able to efficiently eliminate various pollutants through photocatalytic oxidation and reduction. This study suggests a novel strategy for the preparation of environmentally stable and efficient MOF-based photocatalysts to efficiently eliminate various pollutants. Further, there is a huge potential for the practical application of this technology to water purification .
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