INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Zebao Rui,Danyan Feng,Huayao Chen,Hongbing Ji
Highly-ordered TiO 2 nanotube array (TiNT) was prepared by an electrochemical anodization method and used as the support for Ni and Ni–M (M = Ru, Pt and Rh) bimetallic catalysts . Ni/TiNT and Ni–M/TiNT were then applied to the combination reactions of the partial oxidation of methane reaction (POM) with the carbon dioxide reforming with methane reaction (CRM) for the syngas production . The results show that Ni/TiNT suffers from the formation of NiO and NiTiO 3 , and the coke deposition. The superior catalytic performance and the enhanced resistance ability against carbon formation are obtained over a small amount of noble metal modified Ni bimetallic catalysts, which are ranked as Ni/TiNT < Ni–Ru/TiNT < Ni–Pt/TiNT < Ni–Rh/TiNT. The interaction of Ni–M, i.e., enhanced reducibility of NiO and the maintenance of metallic Ni species even in the presence of oxygen, over Ni bimetallic catalysts is regarded as an important reason. Much short distance between the exothermic and the endothermic zones over Ni–M/TiNT catalysts bed can be realized, and a flat temperature profile in the catalyst bed is expected, which in turn can relieve the hot-spot and NiTiO 3 formation to some extent.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Huan He,Jingxian Mei,Feng Liu,Yu Yan,Muhammad Nauman Tahir,Gui Yang,Ziwei Guo,Guoli Dong,Juhong Zhan,Bin Huang,Xuejun Pan
Diversified emerging contaminants pose significant threats to human health and the environment, greatly impeding the reuse of reclaimed water. Currently, photoelectrocatalytic (PEC) technology has been proven as an effective and feasible method for removing contaminants, but its application is limited by complex preparation process of PEC anode. Herein, a novel magnetic attraction synthesis approach was proposed to develop a PEC anode named MnFe 2 O 4 -TiO 2 nanotube arrays. The Magnet-MnFe 2 O 4 -TiO 2 (MMT) anode presented several advantages, including a narrower band gap, decreased charge recombination rates, and minimal electron transfer resistance. The PEC system equipped with MMT anode achieved high degradation efficiencies, removing 76.4 % of 17α-ethinylestradiol (EE2) in 60 min and completely degrading tetracycline (TC) in 10 min. Various pathways for the generation of reactive radicals were clarified in the PEC system, including photocatalysis, electrocatalysis and Fenton reaction. The contributions of each reactive radical were examined, wherein ·OH and ·O 2 − were primary contributors to the degradation of EE2 and TC, respectively. The identification of degradation products also verified the vital roles of reactive radicals in the degradation of two pollutants. This study explored the feasibility of a magnetic attraction synthesis strategy in enhancing the PEC performance to remove trace pollutants in reclaimed water.
研究领域:
环境科学
·
污染控制
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Materials
·
2022
·Vol. 17
·期 4
·045025
·
IF 4.103
Mingchao Jin,Juli Zhu,Zhipeng Meng,Xuesheng Jiang,Zhuo Chen,Juntao Xu,Hongliang Gao,Junkun Zhu,Fengfeng Wu
Titanium dioxide (TiO2), as one of the titanium (Ti)-based implants, holds a promise for a variety of anti-bacterial application in medical research. In the current study, a functional molybdenum disulfide (MoS2)/polydopamine (PDA)-LL-37 coating on titanium dioxide (TiO2) implant was prepared. Anodic oxidation and hydrothermal treatment was given to prepare TiO2 nanotubes-MoS2/PDA-LL-37 (T-M/P-L). The in vitro osteogenic effect of T-M/P-L was evaluated by measuring mesenchymal stem cell (MSC) adhesion, proliferation, alkaline phosphatase (ALP) activity, extracellular matrix (ECM) mineralization, collagen secretion and osteoblast-specific messenger RNAs (mRNAs) expression. The determination on the anti-bacterial ability of T-M/P-L was followed. Furthermore, the ability of T-M/P-L to promote bone formation in vivo was evaluated. Near-infrared (NIR) laser irradiation exposure enabled the T-M/P-L coating-endowed Ti substrates to hold effective anti-bacterial ability. T-M/P-L promoted the adhesion and proliferation of MSCs. In addition, an increase was witnessed regarding the ALP activity, collagen secretion and ECM mineralization, along with the expression of runt-related transcription factor 2, ALP and osteocalcin in the presence of T-M/P-L. Additionally, T-M/P-L could stimulate endothelial cells to secrete vascular endothelial growth factor (VEGF) and promote capillary-like tubule formation. Upon NIR laser irradiation exposure, T-M/P-L not only exhibited efficient in vivo anti-bacterial activity but also facilitated new bone formation. Collectively, T-M/P-L had enhanced anti-bacterial and osteogenic activity under NIR laser irradiation.
研究领域:
生物材料
·
生物医学工程
·
组织工程
·
骨科
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2025
·Vol. 17
·期 15
·2261
·
IF 3
Xiangyu Chen,Hao Zhong,Juanjuan Yao,Jingye Gan,Haibing Cong,Tengyi Zhu
Fibrate pharmaceuticals (fibrates), as a widespread class of emerging contaminants, pose potential risks to both ecological systems and human health. The photocatalytic system based on nitrogen (N) and fluorine (F) co-doped TiO2nanotube arrays (NF-TNAs) provides a renewable solution for fibrate pharmaceutical removal from water, powered by inexhaustible sunlight. In this study, the degradation of two typical fibrates, i.e., bezafibrate (BZF) and ciprofibrate (CPF), under simulated sunlight irradiation through NF-TNAs were investigated. The photocatalytic degradation of BZF/CPF was achieved through combined radical and non-radical oxidation processes, while the generation and reaction mechanisms of associated reactive oxygen species (ROS) were examined. Electron paramagnetic resonance detection and quenching tests confirmed the existence of h+, •OH, O2•−, and1O2, with O2•−playing the predominant role. The transformation products (TPs) of BZF/CPF were identified through high-resolution mass spectrometry analysis combined with quantum chemical calculations to elucidate the degradation pathways. The influence of co-existing ions and typical natural organic matters (NOM) on BZF/CPF degradation were also tested. Eventually, the ecological risk of BZF/CPF transformation products was assessed through quantitative structure–activity relationship (QSAR) modeling, and the results showed that the proposed photocatalytic system can largely alleviate fibrate toxicity.
研究领域:
环境科学
·
材料科学
·
药物污染
·
光化学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yiqing Li,Manqin Fu,Xiaoxia Zhang,Chun He,Dingsheng Chen,Ya Xiong,Liqing Guo,Shuanghong Tian
Highly reactive nanoclusters of metal oxides are extremely difficult to be synthesized due to their thermodynamic instability. For the first time, CuO x nanoclusters supported on anatase TiO 2 nanotubes (NT) with many defects as anchoring sites were successfully prepared. Although the copper loading reached as high as 2.5 %, the size of CuO x nanoclusters in the sample of 2.5 %CuO x /NT were mainly around 1.0 nm. The aggregation of copper species during the calcination process was undoubtedly hampered by the anchoring effects of the abundant defects in NT support. Due to the highly exposed undercoordinated atoms of CuO x nanoclusters, the mixed valences of copper, and the strong interface interaction between CuO x nanoclusters and NT support, 2.5 %CuO x /NT-catalyzed ozonation showed the highest pseudo-first-order reaction rate constant of 8.5 × 10 −2 min −1 , 2.2 and 4.0 times that of NT-catalyzed ozonation and ozonation alone, respectively. Finally, the catalytic mechanism was revealed by both experiments and density functional theory calculations (DFT). The results demonstrated that the undercoordinated Cu in CuO x /NT could highly promote the adsorption of ozone with a high adsorption energy of −125.16 eV and the adsorbed ozone was activated immediately, tending to dissociate into a O 2 molecule and a surface O atom. Thus, abundant reactive oxygen species , e.g., hydroxyl radical (·OH), superoxide radical (·O 2 – ) and singlet oxygen ( 1 O 2 ), could be generated via chain reactions. Especially, ·OH mainly contributed to the removal of ibuprofen pollutants. This work sheds a light on the design and preparation of highly reactive nanoclusters of metal oxide catalysts for catalytic ozonation of refractory organic pollutants .
研究领域:
催化
·
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Yi Wu,Xuan Li,Shaopeng Liu,Ruichen Ma,Peng Liu,Kaiyong Cai
Bone repair in elderly patients is significantly weaker compared to normal bone repair, and one of the main reasons for this is the senescence of bone marrow mesenchymal stem cells (MSCs), which play a key role in the bone repair process. Therefore, we considered the corresponding surface modification of orthopedic implants to cope with the practical problem of bone defects in elderly patients. In this thesis, we prepared TiO 2 nanotubes loaded with metformin (Glucophage) on Ti substrates, followed by self-assembly layer by layer using chitosan-catechol and gelatin on the surface, to delay MSCs senescence by eliminating excessive reactive oxygen species (ROS) and reconstructing extracellular matrix (ECM), thereby achieving osteogenesis. The results showed a significant reduction in senescence-associated secretory phenotype (SASP) generation, an enhancement of PINK1/Parkin-mediated mitochondrial autophagy, and a decrease in intracellular and extracellular ROS levels in MSCs under the dual effects of antioxidants and ECM reconstruction, suggesting that the degree of senescence in MSCs was significantly reduced. Osteogenesis was also demonstrated by expression of osteogenesis-related genes and staining of animal sections. In conclusion, our material can indeed promote the proliferation and osteogenic differentiation of MSCs by delaying cellular senescence, which is expected to provide a novel approach for clinical solutions to tissue repair problems in elderly patients with bone defects.
研究领域:
骨科
·
生物材料
·
组织工程
·
干细胞生物学
·
老年医学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zheng Qian,Kunpeng Jia,Ruirui Ma,Yi Xu,Shunhang Dong,Jie Chen,Qiuyang Zhang,Changjiang Pan
Titanium and its alloys, widely used as orthopedic implants, frequently encounter clinical implantation failure due to insufficient antimicrobial and osteogenic activities. To address these problems, a bioactive multifunctional coating (named TNPTL/Sr@TET) was established on titanium surfaces in this study. Bone-like porous TiO 2 nanotubes (TNT) were first constructed via anodic oxidation, followed by bio-functionalization involving the loading of Sr 2+ ions (TNPTL/Sr) mediated by phase-transited lysozyme (PTL) and the covalently grafting of bone-targeted tetracycline (TET) via the carbodiimide reaction. The morphology, chemical constitution, and surface wettability of the prepared coatings were thoroughly characterized via Scanning Electron Microscopy, Energy Dispersive Spectroscopy, X-ray Photoelectron Spectroscopy, Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy, and water contact angle measurement. The results showed that regular TiO 2 nanotube arrays were developed with an average inner diameter of about 52 nm and a wall thickness of about 16 nm. Analysis of characteristic elements and functional groups confirmed that the amyloid-like PTL layer, Sr 2+ ions, and TET were effectively immobilized on the nanotubes in turn. The TNPTL/Sr@TET coating reduced the inner diameter, increased the wall thickness and roughness of nanotubes, and significantly improved the hydrophilicity of titanium surfaces. The TNPTL/Sr@TET coating accelerated in-situ deposition of cauliflower-like apatite, promoted early adhesion and proliferation of osteoblasts, and upregulated alkaline phosphatase, osteocalcin, and runt-related specific transcription factor-2. The TNPTL/Sr@TET coating also demonstrated strong antibacterial activity against S. aureus and E. coli . The TNPTL/Sr@TET coating presented here provides an innovative strategy to enhance both the osteogenic and antibacterial properties of titanium implants.
研究领域:
生物材料
·
纳米技术
·
表面工程
·
生物医学工程
·
骨科
·
抗菌材料
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 10
·7703-7714
·
IF 2.993
Xiong Yuli,Yang Lin,Xiao Peng,Yang Yannan
Charge separation and oxidation kinetics are both critical for solar energy conversion in photoelectrochemical cell, but it is difficult to enhance simultaneously by a semiconductor. Here, the hydrogenated TiO 2 loaded by Pt nanoparticles with improved charge separation and oxidation kinetics photoanodes are developed, characterized, and tested. The TiO 2 nanotubes are prepared by hydrothermal of Ti foils and used as substrates for hydrogenation and loaded by Pt through photodeposition. Ascribe to the synergetic of hydroxylated surface and Pt nanoparticles, the photocurrent of Pt/H:TiO 2 is enhanced from 0.052 (TiO 2 ) to 0.098 mA/cm 2 at 1.0 V versus RHE for water oxidation and almost increased 1.3 times for sulfite oxidation. Further, the electrons’ transport time has been reduced 20%, and the incident photon-to-electron conversion efficiency for Pt/H:TiO 2 has been increased by 2.5-fold for water oxidation under 350 nm illumination at 1.0 V versus RHE. The charge separation and oxidation kinetics efficiencies of Pt/H:TiO 2 are improved to 62.2 and 39.9% compared with pristine TiO 2 (54.2 and 27.6%) at 1.0 V versus RHE. The origin of the enhanced photoelectrochemical performances for Pt/H:TiO 2 is due to the hydroxylated surface and the absorption of plasmon resonance by Pt nanoparticles.
研究领域:
材料科学
·
光化学
·
纳米技术
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xin Zheng,Yajing Ji,Shengjie Li,Siyao Liu
The sensing of phthalate esters (PAEs) is vital for people’s health and environmental protection. This study aimed to develop a highly sensitive and selective photoelectrochemical (PEC) biosensor for PAEs analysis in complex samples. The biosensor is based on a CdS nanoparticle/TiO2 nanotube (CdS NP/TiO2 NT) electrode substrate and a truncated PAEs aptamer (PAEs-apt). By exploiting spatial variations in the potential resistance of the sensing interface, the biosensor achieved superior sensitivity in determining the concentration of PAEs compared to the SELEX aptamer. It exhibited a linear correlation in the range of 0.005 to 1 ng/mL with a detection limit of 1.67 ng/L. Furthermore, the biosensor displayed excellent selectivity for PAEs, with an analysis error factor below 0.277 when the concentration of interfering species was 100 times that of the target. The high performance of the biosensor was attributed to the excellent photoelectronic properties of CdS NPs/TiO2 NTs, high density of PAEs-apt for PAEs, high affinity of PAEs-apt for PAEs, and specific recognition of PAEs. Notably, this PEC biosensor could be used for the PAEs assay in urine and water samples, providing a sensitive and simple analytical method for detecting the same class of compounds with similar chemical structures in complex samples.
研究领域:
环境科学
·
分析化学
·
生物传感器
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 19
·期 7
·2206265
·
IF 15.153
Tiexin Ding,Lan Zhang,Jing Han,Jianhong Zhou,Yong Han
Percutaneous implants may experience infection for several times during their servicing periods. They need antibacterial activity and durability to reduce recurrent infection and cytocompatibility to reconstruct biosealing. A novel photoresponse bio-heterojunction (PCT) is developed herein. It consists of TiO 2 nanotubes loaded with CuS nanoparticles and wrapped with polydopamine (PDA) layer. In PCT, a built-in electric field directing from TiO 2 to CuS and then to PDA is formed, and with near-infrared (NIR) irradiation, it drives photoexcited electrons to transfer in opposite direction, resulting in the separation of electron–hole pairs and formation of reactive oxygen species (ROS). Simultaneously, PCT shows photothermal effect due to nonradiative relaxation of photoexcited electrons and thermal vibration of lattices. The synergic effect of photogenerated ROS and hyperthermia increases bacterial membrane permeability and leakage of cellular components, endowing PCT with outstanding antibacterial performance. More importantly, PCT has good antibacterial durability and cytocompatibility due to the inhibited leaching of CuS by PDA layer. In reinfected models, with NIR irradiation, PCT sterilizes bacteria, reduces inflammatory response and enhances re-integration of soft tissue efficiently. This work provides an outstanding bio-heterojunction for percutaneous implants in treating reinfection by NIR irradiation and rebuilding biosealing.
研究领域:
生物材料
·
生物医学工程
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Wenlan Ji,Yuan Wang,Tian Cheng Zhang,Like Ouyang,Shaojun Yuan
Addressing the ever-growing arsenite pollution in groundwater has become an essential and urgent issue for ensuring the safety of human beings and the environment. It is highly attractive to preoxidize As(III) to relatively low toxic As(V) for further efficient arsenic removal by adsorption, ion exchange, or coagulation. In this study, a novel heterostructure Cu2O@TiO2 nanotube array coated titanium anode (CTNTA) was fabricated by combination of electrochemical anodization and electrodeposition and used for the highly efficient photoelectrocatalytic oxidation conversion of As(III) to As(V) in aqueous solution. The morphology, composition, and photoelectric performances of the CTNTA anode were systematically characterized. The effect of the loading amount of Cu2O nanoparticles on the photoelectrocatalytic oxidation kinetics of As(III) was investigated, and the comparison study among photocatalytic, electrocatalytic, and photoelectrocatalytic oxidations of As(III) was also explored to demonstrate the synergistic effect of As(III) oxidation conversion performance. The heterostructure CTNTAs-1.00 delivered a substantially enhanced photoelectrocatalytic oxidation ratio of As(III) at 95% within 30 min at a current density of 10 mA·cm–2 under visible-light irradiation. The electrochemical deposition amount of Cu2O nanoparticles on TiO2 nanotube arrays (TNTAs) was found to be positively correlated with the achievement of boosted As(III) oxidation efficiency. The high photoelectrocatalytic oxidation performance of the CTNTA was ascribed to the favored separation efficiency of photoinduced carriers and electron–hole pairs under both visible light irradiation and electric potential conditions. The photoelectrocatalytic oxidation reaction mechanism was proven to be ascribed to the active species of holes (h+), superoxide radicals (•O2–), and hydroxyl radicals (•OH). These results highlight the high conversion rate of As(III) by the photoelectrocatalytic oxidation reaction on such a nanostructured anode, which offers a promising methodology for further in-depth oxidation of As(III) in aqueous solution.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Jingju Cai,Minghua Zhou,Yuwei Pan,Xuedong Du,Xiaoye Lu
Efficient anode materials are essential to electrochemical advanced oxidation processes (EAOPs) for organic wastewater treatment. In this regard, blue TiO 2 nanotube arrays (Blue-TNA) anode was prepared for the first time in formic acid electrolyte by electrochemical self-doping and applied for electrochemical degradation of contaminants. Characterized by XPS, Raman and Mott-Schottky curves, the formation of Ti 3+ on Blue-TNA was confirmed. This anode was more efficient and had a higher hydroxyl radical production activity (1.7 × 10 −14 M) than BDD (9.8 × 10 -15 M), inducing a higher TOC and COD removal of 100 mg/L phenol with a lower energy consumption of 9.9 kW h/(kg COD) at current density 2.5 mA/cm 2 , pH 5 in 0.1 M Na 2 SO 4 , account for the lower accumulation of degradation intermediates. Both • OH and SO 4 •- were responsible for the degradation on Blue-TNA anode, while their contributions differed greatly with that of BDD, and could be affected and regulated by the operating parameters like current density, initial pH and Na 2 SO 4 concentration. Blue-TNA anode represented a relative stable performance for 5 cycles degradation of 100 mg/L phenol for each cycle of 300 min, and such an oxidation capacity could be easily regenerated by electrochemical reduction in formic acid. Blue-TNA anode had an excellent performance on the TOC removal and MCE especially at low current density of 2.5 mA/cm 2 when compared with other anodes. Therefore, Blue-TNA anode is hopeful a promising and cost-effective anode for electrochemical oxidation.
研究领域:
环境科学
·
电化学
·
水处理
·
高级氧化过程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）