CHEMOSPHERE
·
2023
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IF 8.8
Xue Bai,Xuan Dao,Qin Wang,Jiangna Xing,Ting Wang,Xin Huang,Hongxun Hao
Tetracycline (TC) as a common antibiotic has adverse effects on human healthy and biological survival. In this study, a novel MXene/TiO 2 /Fe hybrid was designed and successfully synthesized by combination method of calcination and hydrothermal reduction. The photocatalysts were characterized by PXRD , SEM , TEM , VSM and XPS, etc. It was found that MXene/TiO 2 /Fe exhibited 2D multilayer structure like MXene. The in-situ synthesized TiO 2 through calcinating MXene exhibited an octahedral biconical structure with exposed (001) and (101) facets. Surface heterojunction of (001) and (101) facets was formed within TiO 2 , which enhanced the separation of photogenerated electrons and holes. The residual MXene could play a role in co-catalyst to capture the photo-generated electrons from TiO 2 . Moreover, Fe nanoparticles not only optimize the band gap structure and increase the specific surface area, but also store the electrons as a good electrons acceptor, which further promote the separation of electrons and holes. The TC removal efficiency of optimal MXene/TiO 2 /Fe could reach 92% within 120 min. Moreover, the influence of external environment factors such as pH, catalyst dosages and common anions were investigated in detail. Mechanism analysis show that h + , •OH and •O 2 − are the main active substances. Finally, the degradation pathways were proposed according to LC-MS.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ningning Gao,Wenbin Xie,Lijing Xu,Qingping Xin,Junkui Gao,Junjun Shi,Jin Zhong,Wenxiong Shi,Huiguo Wang,Kongyin Zhao,Ligang Lin
The development of membranes for protein purification has stringent requirement of disinfection resistance, low protein adsorption and anti-fouling, without changing protein structure. In this study, hydrophilic titanium dioxide (TiO 2 )/calcium alginate (TiO 2 /CaAlg) hydrogel membranes were prepared by a simple ionic cross-linking method. The effects of the porogenic agent polyethylene glycol (PEG) concentration, the molecular weight of PEG, and the concentration of TiO 2 on the filtration properties were systematically investigated. The TiO 2 /CaAlg membrane exhibited excellent bovine serum albumin (BSA) rejection and anti-fouling properties. The mechanical properties and surface energy of the TiO 2 /CaAlg membrane were significantly improved. The chemical bonding mechanism of TiO 2 and NaAlg was investigated by molecular dynamic simulation. The TiO 2 /CaAlg membrane had good chlorine resistance and could be disinfected or cleaned with sodium hypochlorite. The TiO 2 /CaAlg hydrogel membrane loaded with polyhydroxybutyrate (PHB) nanofibers maintained high flux (136.7 L/m 2 h) and high BSA rejection (98.0 %) at 0.1 MPa. The results of circular dichroism and synchronous fluorescence indicated that the secondary structure of BSA was maintained after membrane separation. This study provides one method for the preparation of green and environmentally friendly membrane for protein purification.
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APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Xiaohu Liu,Huamin Liu,Yi Li,Fei Teng,Ce Liang
Superhydrophobic surfaces have gained significant popularity in industrial production due to their unique structure resembling lotus leaves. Achieving the mechanical stability of superhydrophobic surfaces and improving the self-cleaning and deicing effects have attracted critical research focus. This study incorporated a hybrid composite of titanium dioxide nanoparticles (TiO 2 ) and multi-walled carbon nanotubes (MWCNTS), denoted as TiO 2 -MWCNTS, into an epoxy resin matrix. The hybrid composite was spray-coated onto the substrate and cured, resulting in a superhydrophobic surface with excellent wear resistance and deicing performance. By adjusting the mass ratio of TiO 2 and MWCNTS, it was found that a 3:1 ratio exhibited a contact angle (WCA) of 159.8° ± 0.5°. Incorporating the TiO 2 -MWCNTS hybrid structure not only significantly improved the mechanical durability of the coating surface but also harnessed the outstanding photothermal conversion ability of carbon nanotubes, imparting excellent deicing capability to the coated surface. Therefore, this superhydrophobic surface holds great practical value for outdoor applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
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IF 9.5
Ruili Li,Guoqing Xiao,Chunlin Chen,Chunyan Chen,Xinyin Hu,Yuanyuan Li,Zhengwei Yang,Shuyi Shang,Mingtan Wang
Low separation efficiency and poor reusability have become the most important factors restricting the development of membranes in water purification . Herein, a photocatalytic self-cleaning graphene oxide (GO) membrane with a unique intercalated structure of CPU@PAA@TiO 2 (CPU: CNS@PDA@UiO-66-NH 2 , PAA: polyacrylic acid, CNS : carbon nanospheres, PDA: polydopamine) was prepared by simple vacuum filtration self-assembly. The water channels formed by photocatalysis nano-filler CPU@PAA@TiO 2 and the dense laminated structure of GO layer existed in the membrane at the same time. The core-shell CPU has a larger photocatalytic area than UiO-66-NH 2 . Moreover, the crosslinking modification of CPU, PAA, and TiO 2 leads to an excellent water flux, dye separation performance, and photocatalytic activity of composite membranes . The water flux of GO/CPU/PAA/TiO 2 membrane was 230.48 L ∙ m −2 ∙ h −1 ∙ bar −1 , and the flux of three dyes was over 220 L ∙ m −2 ∙ h −1 ∙ bar −1 while the removal rates were over 99.5%. After 120 min of visible light irradiation, the GO/CPU/PAA/TiO 2 membrane exhibited an enhanced degradation (94.21%) for methylene blue because of the suitable band-gap alignment and synergistic effect between CPU and TiO 2 . In addition, the GO/CPU/PAA/TiO 2 membrane exhibited excellent acid/alkaline-stability and reusability in dye filtration and photocatalytic performance. The results indicated that the GO/CPU/PAA/TiO 2 membrane has great potential in water purification and photocatalytic self-cleaning.
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ACS Omega
·
2023
·
IF 4.1
Lei Wang,Guangyuan Xie,Xiang Mi,Bin Zhang,Yu Du,Qiuyu Zhu,Zhicheng Yu
The grafted modification TiO2@SiO2 composite was fabricated by a liquid-phase deposition method with Na2SiO3 and a grafting reaction with a silane coupling agent. First, the TiO2@SiO2 composite was prepared, and the effect of deposition rate and silica content on the morphology, particle size, dispersibility, and pigmentary property of TiO2@SiO2 composites was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and ζ-potential. The islandlike TiO2@SiO2 composite had a good particle size and printing performance compared with the dense TiO2@SiO2 composite. The presence of Si was confirmed by EDX elemental analysis and XPS, and a peak at 980 cm–1 belonging to Si–O was observed in the FTIR spectrum, confirming the presence of SiO2 anchored at TiO2 surfaces via Si–O–Ti bonds. Then, the islandlike TiO2@SiO2 composite was modified by grafting with a silane coupling agent. The effect of the silane coupling agent on the hydrophobicity and dispersibility was investigated. The peaks at 2919 and 2846 cm–1 belong to CH2 in the FTIR spectrum, and Si–C in the XPS confirmed the grafting of silane coupling agent to the TiO2@SiO2 composite. The grafted modification of the islandlike TiO2@SiO2 composite using 3-triethoxysilylpropylamine endowed it with weather durability, dispersibility, and good printing performance.
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FUEL
·
2021
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IF 6.609
Yanting Chen,Mingxia Wang,Feng Yan,Wei Wang,Yuning Qu,Hongbo Fang,Zhenyu Cui,Benqiao He,Jianxin Li
In order to produce hydrogen fuel in green and environmentally friendly method, a series of novel metal-5,10,15,20- meso -tetra(p-hydroxypheny) porphyrin (MTHPP, M = Cu, Zn and Ni) mono-dispersedly functionalized MTHPP-sg-PSf/TiO 2 mixed matrix membranes (MP 12 -M 3 MMMs) were prepared via the in-situ surface grafting. UV–Vis induced hydrogen evolution from water shows an increasing order of NiP 12 -M 3 < P 12 -M 3 < ZnP 12 -M 3 < CuP 12 -M 3 , and the hydrogen production by CuP 12 -M 3 was up to 70.63 mmol/m 2 , which is 7.25 times higher than that of control membrane without metal ion (P 12 -M 3 ). The apparent quantum yield (AQY) at λ = 420 nm of CuP 12 -M 3 was 31.7 %, which are better than most reported photocatalysts. Furthermore, the hydrogen evolution performance of the MP 12 -M 3 MMMs are higher than that of equivalent MTHPP-TiO 2 powder, indicating that the porous membrane can immobilize porphyrin and TiO 2 monodispersely to improve its catalytic performance significantly. Finally, the photocatalytic mechanism of the MP 12 -M 3 MMMs was explored by electrons transfer rate constant (k ET ), excited state oxidation potential (E OX(dye*) ), electron spin resonance (ESR) and density functional theory (DFT). This work details the construction a photocatalytic membrane by novel surface modification method, which can be used for long-term photolysis of water to produce hydrogen and provide an effective strategy for improving hydrogen production performance.
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Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 22
·11980-11989
·
IF 12.732
Zhuo Liu,He Lv,Ying Xie,Jue Wang,Jiahui Fan,Baihe Sun,Lin Jiang,Yang Zhang,Ruihong Wang,Keying Shi
Very diverse two-dimensional (2D) materials have bloomed in NO2 gas sensing applications, which provides new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure of the Ti3C2Tx@TiO2@MoS2 composite was well designed via a facile one-step hydrothermal route, in which TiO2 nanosheets are in situ grown on ultrathin and highly conductive Ti3C2Tx MXene. Simultaneously, the few-layer and vertically oriented MoS2 nanoflakes rich in active edge-sites were uniformly distributed in the composite. Ti3C2Tx MXene and MoS2 act respectively as the electron reservoir and main sensitive material. The strong interfacial contact in different components facilitated the transfer of charge carriers and their spatial separation. Integrating the unique structural and electronic properties, the as-prepared Ti3C2Tx@TiO2@MoS2 sensor exhibited a remarkable gas sensing performance at room temperature (Ra/Rg = 55.16, 50 ppm NO2), which is 7.3, 3.8 and 2.1 times higher than that of pristine MoS2, TiO2@MoS2 and Ti3C2Tx@MoS2 composites, respectively. It also achieved ultrafast response time (1.8 s), more than 90% recoverability, low detection limit (23 ppb), dedicated selectivity and as long as eight-week stability.
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International Journal of Environmental Research and Public Health
·
2021
·Vol. 18
·期 23
·12339
·
IF 3.39
Chengzhi Zhou,Yanlong Sun,Fan Zhang,Yuandong Wu
The photocatalytic degradation of minocycline was studied by using polyvinylidene fluoride–polyvinylpyrrolidone–TiO2(PVDF–PVP–TiO2) fiber mats prepared by an electrospinning technology. The influences of the TiO2dosage, minocycline concentrations, inorganic anions, pH values, and dissolved organic matter (DOM) concentrations on the degradation kinetics were investigated. A mass of 97% minocycline was degraded in 45 min at 5% TiO2dosage. The corresponding decomposition rate constant was 0.069 min−1. The inorganic anions affected the minocycline decomposition in the order of HCO3−> Cl−> SO42−> NO3−, which was confirmed by the results of electron spin resonance (ESR) spectra. The lowest electrical energy per order (EEO) was 6.5 Wh/L. Over five cycles, there was no change in the photocatalytic performance of the degrading minocycline. Those investigations suggested that effective degradation of minocycline could be reached in the PVDF–PVP–TiO2fiber mats with a low energy consumption, good separation and, good recovery. Three photocatalytic decomposition pathways of minocycline were proposed: (i) hydroxyl substitution of the acylamino group; (ii) hydroxyl substitution of the amide group, and (iii) a cleavage of the methyl groups and further oxidation of the amino group by OH. Potential risks caused by TP159 and TP99 should not be ignored, while the TP90 are nontoxic. Tests indicated that the toxicity of the photocatalytic process may be persistent if minocycline and its products were not mineralized completely.Keywords:electrospinning;minocycline;photocatalytic oxidation;PVDF–PVP–TiO2fiber mats;degradation mechanism
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 24
·28321-28334
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IF 2.478
Jiang Yinying,Wang Yizheng,Zhou Kuan,Ding Senxu,Yu Jiang
In recent years, heterojunction photocatalytic materials have received more and more attention. Ball milling and microwave–assisted heating were used in this work to prepare the g–C 3 N 4 /TiO 2 heterojunction photocatalytic nanocomposites with different g–C 3 N 4 /TiO 2 mass ratios (0.5:1, 1:1, 2.5:1, 5:1, 10:1, 20:1, 30:1, and 40:1, labeled as TCN–1, TCN–2, TCN–3, TCN–4, TCN–5, TCN–6, TCN–7, and TCN–8, respectively). The crystal structure, morphology, and optical properties of the samples were characterized by various analytical techniques. The photocatalytic activity was evaluated by the degradation efficiency of Rhodamine B (RhB) and methylene blue (MB) under visible light and UV irradiation. After 120 min at visible light illumination, TCN–7 had the best degradation efficiency with 99.41% for RhB and 91.75% for MB, whereas after 120 min at UV light illumination, TCN–7 exhibited the best degradation effect, and the efficiency reached at 48.66% for RhB and 71.64% for MB, respectively. The analysis of crystal structure of the as–prepared TCN samples confirmed that TCN–7 has a good crystallinity, which is facilitated for photocatalytic activity. In photocatalytic reactions, superoxide radical (·O 2 − ), hydroxyl radical (·OH), and hole (h + ) are recognized as the main active groups, and ·O 2 – plays the main role for TCN–7 in the photocatalytic reaction system for the degradation of RhB.
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Materials Today Communications
·
2023
·
IF 3.8
Jianye Shi,Jin Chen,Xinle Wang,Zhikang Liu,Yuzhao Ma,Xiaofeng Yang,Meidan Que,Yanjun Li
Developing a lightweight microwave absorbing materials with high absorption capacity and wide absorption bandwidth at low thickness is a perennial challenge in practical applications in the microwave absorption (MA) field. Herein, sandwich-like heterogeneous Ti 3 C 2 T x /TiO 2 /Fe 3 O 4 /Fe are designed by synergistically incorporating dielectric-magnetic components with a simple solvothermal method and post-annealing. The sandwich-like heterogeneous interface produces sufficient conduction loss for Ti 3 C 2 T x /TiO 2 /Fe 3 O 4 /Fe, with TiO 2 crystals and amorphous carbon anchored on its surface to enhance interface polarization and Debye relaxation. Additionally, the presence of Fe nanoparticles induces magnetic loss, including natural resonance and eddy current loss. By bidirectionally regulating the ratio of Ti 3 C 2 T x and Fe 3 O 4 , the minimum reflection loss (RL min ) value reaches − 64.6 dB at 17.49 GHz with a 1.48 mm thickness, and the corresponding effective absorption bandwidth (EAB, RL < −10 dB) is 4.59 GHz (13.41–18 GHz). The results suggest that the exceptional EMW absorption performance of composites can be attributed to the dielectric-magnetic synergistic effect and sandwich-like heterostructures . This study offers a rational approach for synthesizing ultrathin and lightweight Ti 3 C 2 T x -based absorbers.
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ANALYTICAL CHEMISTRY
·
2017
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IF 6.32
Xue Li,Lusheng Zhu,Yunlei Zhou,Huanshun Yin,Shiyun Ai
A novel photoelectrochemical (PEC) assay is developed for sensitive detection of protein kinase A (PKA) activity based on PKA-catalyzed phosphorylation reaction in solution and signal amplification strategy triggered by PAMAM dendrimer and alkaline phosphatase (ALP). In this strategy, it is noteworthy at this point that PKA phosphorylation was achieved in solution instead of on the surface of the electrode, which has advantages of the good contact in reactants and simple experimental procedure. For immobilizing the phosphorylated peptide (P-peptide) on electrode surface, graphite-like carbon nitride (g-C3N4) and titanium dioxide (TiO2) complex is synthesized and characterized, which plays a significant role for TiO2 conjugating phosphate groups and g-C3N4 providing PEC signal. Subsequently, PAMAM dendrimer and ALP can be captured on P-peptide and TiO2/g-C3N4 modified ITO electrode via interaction between the -COOH groups on the surface of PAMAM dendrimer and the -NH2 groups of peptide and ALP, which can lead to the increase of ALP amount on the modified electrode surface assisted with the PAMAM dendrimer. As a result, the amount of ALP catalyzes of L-ascorbic acid 2-phosphate trisodium salt (AAP) to produce electron donor of ascorbic acid (AA), resulting in an increased photocurrent. The proposed detection assay displays high selectivity and low detection limit of 0.048 U/mL (S/N = 3) for PKA activity. This biosensor can also be applied for the evaluation of PKA inhibition and PKA activity assay in cell samples. Therefore, the fabricated PEC biosensor is potentionally well in PKA activity detection and inhibitor screening.
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SOLID STATE SCIENCES
·
2026
·
IF 3.6
Xiaohan Du,Chenxi Sun,Chengyang Zhang,Mengmeng Zhen
A hierarchical P-TiO 2 @CNTs heterostructure is fabricated via synergistic defect and architecture engineering. • P-doping in situ triggers abundant oxygen vacancies and optimizes electronic structure for fast Na + transport. • 3D CNT network guides vertical growth of ultrathin TiO 2 nanosheets and suppresses agglomeration. • The P-TiO 2 @CNTs anode exhibits ultra-long cycling stability with 0.019% low-capacity decay rate per cycle after 3000 cycles at 2.0 A g −1 . A hierarchical P-TiO 2 @CNTs heterostructure is rationally designed via synergistic defect and architecture engineering for high-performance sodium-ion batteries. The CNT backbone acts as both a conductive network and a structural template to direct the vertical growth of ultrathin TiO 2 nanosheets, effectively suppressing agglomeration and shortening Na + diffusion paths. P-doping not only induces abundant surface oxygen vacancies to optimize the electronic band structure, and enrich active sites but also modulates lattice interspacing for accelerated Na + diffusion. Benefiting from the synergy of P-doping-triggered vacancies and 3D conductive CNT networks, the P-TiO 2 @CNTs anode delivers exceptional rate capability and ultra-long cycling stability (0.019% low-capacity decay rate per cycle after 3000 cycles at 2.0 A g −1 ). This work provides a universal strategy for integrating defect engineering and hierarchical architecture design to develop advanced TiO 2 -based anodes for high-power and long-life sodium-ion storage. Download: Download high-res image (351KB) Download: Download full-size image
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