JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Jie Hou,Chao Hu,Pei Li,Daohui Lin
Interactions between nanomaterials (NMs) and coexisting contaminants are important contributors to their joint biological effects, while the reverse actions of bioresponses in determining the toxic interaction between NMs and contaminants were rarely understood. Here, we investigated the toxic interaction and mechanism between TiO 2 NMs (nTiO 2 ) and pentachlorophenol (PCP) in soil using the model nematode ( Caenorhabditis elegans ). PCP (0.5–50 mg/kg) and nTiO 2 (50–5000 mg/kg) co-exposures induced antagonistic effects on the survival, growth, and locomotion of nematodes, and the levels of ultrastructural damage and oxidative stress exhibited consistent alterations. Soil PCP concentrations changed insignificantly after the single or combined exposures, indicating a negligible direct interaction between PCP and nTiO 2 under the soil condition. Transcriptomic analysis revealed that after 50 mg/kg PCP exposure, half of differentially expressed genes were involved in epidermal collagen synthesis, while the PCP-nTiO 2 co-exposure particularly activated genes related to antistress responses and the positive regulation of physiological functions. Further biochemical analysis demonstrated the antagonistic interactions were derived from two aspects: 1) PCP-induced epidermal collagen incrassation lowered the bioaccumulation and toxicity of nTiO 2 ; 2) nTiO 2 -activated glutathione detoxification pathway alleviated PCP-induced toxicity. These findings highlight the key role of bioresponses in determining toxic interactions between NMs and co-contaminants.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 24
·28417-28425
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IF 2.478
Wang Jinlin,Zhou Xiaojun,Ni Jian,Guan Jiayi,Hu Minghao,Wang Rufeng,Zhang Yaofang,Li Juan,Cai Hongkun,Zhang Jianjun
Mesoporous TiO 2 (m-TiO 2 ) is widely used in the preparation of perovskite solar cells (PSCs) due to its fast carrier transfer and strong light scattering capacity, but the trap states of TiO 2 will cause serious recombination, which will affect the performance of the PSCs to a great extent. Surface treatment is an efficient way to passivate the surface defects of TiO 2 and improve the performance of devices. In this study, we introduce a TiO 2 composite treatment strategy that treats TiO 2 films with low-concentration hydrochloric (HCl) solution and ultraviolet ozone (UVO). The composite treatment has no adverse impact on the structure of TiO 2 , which can be confirmed by X-ray diffraction (XRD), atomic force microscope (AFM), and scanning electron microscope (SEM) measurement. X-ray photoelectron spectroscopy (XPS) shows a 4.62% decrease of surface oxygen vacancies in TiO 2 films, which means the composite treatment can reduce the surface defects resulting from oxygen vacancies. To further explore the carrier transfer performance of treated TiO 2 films, the time-resolved photoluminescence (TRPL) spectroscopy and space charge-limited currents (SCLC) measurement were used. The measurements show a decrease to 59.03 ns of average charge carrier lifetime and a 0.023 V reduction of limit voltage, indicating a stronger electron extraction capability and less defect states. Finally, we achieve a power conversion efficiency (PCE) of 18.9% compared to 17.6% for the control PSCs.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yujia Wang,Zhigang Zhang,Yijiang Chen,Zhengfa Zhu,Hao Wang,Xiaoning Tang
Designing efficient antimicrobials for the rapid disinfection of water is increasingly critical owing to the rising threat of pathogenic microorganisms. In this study, direct Z-scheme Bi 2 WO 6 /TiO 2 heterojunctions were constructed using a simple in situ hydrothermal method. The optimal Bi 2 WO 6 /TiO 2 Z-scheme heterojunction inhibited 98.80 % of Escherichia coli (5 × 10 8 CFU mL −1 ) at 0.35 mg mL −1 and 99.33 % of Staphylococcus aureus (5 × 10 8 CFU mL −1 ) at 0.5 mg mL −1 after 10 min of light-emitting diode (LED) light irradiation. Furthermore, in antibiotic degradation experiments, Bi 2 WO 6 /TiO 2 had a 92.91 % removal rate for ciprofloxacin with a pseudo-second-order degradation rate constant ( k ) of 0.056 min −1 after 240 min of irradiation. The antibacterial mechanism of Bi 2 WO 6 /TiO 2 was systematically investigated and confirmed to occur by LED light-driven surface activation and efficient charge transfer. The surface and interfacial structures of the Bi 2 WO 6 /TiO 2 samples were studied by high-resolution transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The antibacterial mechanism was studied by controlled experiments and electron spin resonance analyses, which revealed that the primary antibacterial mechanism of Bi 2 WO 6 /TiO 2 is oxidative sterilisation via generated reactive oxygen species. Time-resolved fluorescence spectroscopy was used to analyse the charge-transfer pathway in Bi 2 WO 6 /TiO 2 , which demonstrated that the spatial separation of the redox-active sites extended the lifetimes of the photogenerated carriers, enhancing the oxidative destruction of bacteria. This comprehensive understanding paves the way for the design of new Z-type heterojunction photocatalytic materials for antimicrobial applications.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jia Li,Yimin Tang,Xiuwen Wang,Wei Kan,Libin Yang,Xin Jiang,Yukihiro Ozaki,Xiaoxia Han,Bing Zhao
Surface oxygen vacancy defects and energy band defects can be synchronously regulated to accelerate the charge transfer in a semiconductor–molecule system for boosting the surface-enhanced Raman scattering (SERS) performance of a semiconductor. Herein, alkaline earth metal Sr with a low electronegativity and a large atomic radius was selected as a dopant to prepare a Sr-doped TiO2 (SrnTiO2) SERS substrate, in which a simple Sr doping achieves a synchronous regulation of double defects (i.e., surface oxygen vacancy defect and energy level defect of Ti) in TiO2. Abundant surface oxygen vacancies and defect energy levels of Ti are jointly responsible for the greatly enhanced SERS performance of the substrate. On the optimal substrate Sr0.0100TiO2, the minimum detection limit of a nonresonance molecule, 4-mercaptobenzoic acid, can reach 1 × 10–9 M, and the enhancement factor is as high as 9.3 × 106. To the best of our knowledge, this is the highest SERS activity among the reported semiconducting substrates, even comparable to those of precious metals. Moreover, the SrnTiO2 substrate shows an excellent spectral reproducibility and ultrahigh stability, which can withstand the corrosions of strong acid and alkali and even can resist the oxidation of high temperatures for SERS detection.
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FUEL
·
2023
·
IF 7.4
Chong Xia,Yuanqing Zhu,Song Zhou,Yongming Feng,Jie Shi
Besides catalyzing NOx reduction, the V 2 O 5 -WO 3 /TiO 2 catalyst can effectively suppress the formation of urea (CH 4 N 2 O) decomposition by-products in selective catalytic reduction (SCR). However, current research lacks a clear understanding of the impact of urea and its by-products on the catalyst' performance. Additionally, there is no available kinetic model to describe the decomposition process of urea and its by-products on the V 2 O 5 -WO 3 /TiO 2 catalyst. In this paper, the decomposition process of urea and its by-products on the catalyst was firstly investigated via thermogravimetric analysis (TGA). It was found that increasing the catalyst dosage can accelerate urea decomposition and block the transformation pathways from urea and biuret (C 2 H 5 N 3 O 2 ) to cyanuric acid (cya, C 3 H 3 N 3 O 3 ). However, as the decomposition temperature of the by-products increased, a larger amount of catalyst was also required. Secondly, the impact of urea and its by-products on the NOx reduction performance was investigated via the SCR test bench. The results showed that, at 200 ℃, the addition of 20 % urea, biuret, or cya decreased the NOx reduction rate by 7.2 %, 9.8 %, and 11.0 % respectively. Furthermore, the catalyst's performance was significantly improved at 400 ℃ dues to the decomposition of urea and its by-products. Then, various characterization techniques were used to analyze the morphology and chemical composition of the urea decomposition products on the catalyst at different temperatures. On this basis, a simplified urea non-catalytic and catalytic coupling mechanism model was developed, which included 7 species and 16 reactions. Finally, the kinetic parameters of the proposed urea catalytic decomposition model were optimized utilizing TGA test data, density functional theory (DFT), and genetic algorithms (GA). This study can provide guidance for the elimination of SCR urea deposits in engineering applications.
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MOLECULES
·
2023
·Vol. 28
·期 22
·7475
·
IF 4.6
Linbo Deng,Jiawei Liu,Haiyan Huang,Changxi Deng,Limin Lu,Linyu Wang,Xiaoqiang Wang
In view of the serious side effects of chlortetracycline (CTC) on the human body, it is particularly important to develop rapid, sensitive, and selective technologies for the detection of CTC in food. In this work, a molecularly imprinted electrochemical sensor with [Fe(CN)6]3−/4−as signal probe was proposed for the highly sensitive and selective detection of CTC. For this purpose, TiO2, which acts as an interlayer scaffold, was uniformly grown on the surface of Ti3C2Txsheets through a simple two-step calcination process using Ti3C2Txas the precursor to effectively avoid the stacking of Ti3C2Txlayers due to hydrogen bonding and van der Waals forces. This endowed TiO2@Ti3C2Txwith large specific surface, abundant functional sites, and rapid mass transfer. Then, polypyrrole molecularly imprinted polymers (MIPs) with outstanding electrical conductivity were modified on the surface of TiO2@Ti3C2Txvia simple electro-polymerization, where the pyrrole was employed as a polymeric monomer and the CTC provided a source of template molecules. This will not only provide specific recognition sites for CTC, but also facilitate electron transport on the electrode surface. The synergistic effects between TiO2@Ti3C2Txand polypyrrole MIPs afforded the TiO2@Ti3C2Tx/MIP-based electrochemical sensor excellent detection properties toward CTC, including ultra-low limits of detection (LOD) (0.027 nM), a wide linear range (0.06–1000 nM), and outstanding stability, reproducibility, selectivity, and feasibility in real samples. The results indicate that this strategy is feasible and will broaden the horizon for highly sensitive and selective detection of CTC.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Chenyue Mao,Hua Lei,Zhiyu Guo,Xuchao Jia,Xiaodong Cui,Jiawei Huang,Linfeng Fei,Yanmin Jia,Wanping Chen
As tribo-catalysis gains increasing attention to harness mechanical energy for environmental remediation, it is time to explore its application to those organic pollutants that have been challenging to degrade. In this study, four commercial metal oxide nanoparticles , BaTiO 3 , ZnO, P25 TiO 2 , and DXN-RT30 TiO 2 nanoparticles, were stimulated through magnetic stirring to degrade 20 mg/L methyl orange (MO) and 30 mg/L methylene blue (MB) solutions. While all the other nanoparticles showed rather poor performance, DXN-RT30 TiO 2 nanoparticles performed exceptionally well: With Teflon magnetic disks rotating at 400 rpm, 98.2% of MO and 100% of MB were degraded within 330 and 420 min, respectively. DXN-RT30 TiO 2 nanoparticles demonstrated a unique absorption for MB molecules, yielding significantly different outcomes in active species trapping experiments between degradation of MO and MB solutions by DXN-RT30 TiO 2 . Complemented by electron paramagnetic resonance analysis, our findings suggest that for DXN-RT30 TiO 2 nanoparticles under magnetic stirring, MO molecules are degraded by h + , ·OH, and e − in solution, while MB molecules are absorbed and degraded via h + and e − on the surface of DXN-RT30 TiO 2 nanoparticles. This study identifies DXN-RT30 TiO 2 nanoparticles as a cost-effective, high-performance, and environmentally friendly tribo-catalyst for environmental remediation, stimulating further exploration for more excellent tribo-catalysts.
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Chinese Physics B
·
2023
·Vol. 32
·期 11
·118201
·
IF 1.7
Wei Jin,Liyuan Zhang,Wenjing Zhang,Qian Sun,Dekai Zhang,Hui Miao,Xiaoyun Hu
As a traditional n-type semiconductor, TiO2 has good UV absorption ability and stable physical and chemical properties. However, its wide band gap and low oxygen evolution reaction (OER) activity limit its application in the field of photoelectrochemical (PEC) water splitting. In this work, a type-II TiO2/CuNi2S4 heterojunction photoanode is successfully constructed, which expanded the light absorption range to visible and enhanced the OER activity. Firstly, TiO2 nanotubes (NTs) thin films are prepared on Ti substrates by two-step anodization, and then the bi-functional electrocatalytic material CuNi2S4 is grown on TiO2 NTs in the shape of nanosheets (NSs) in situ by solvothermal method. As a bi-functional electrocatalytic material, CuNi2S4 has good visible light absorption property as well as OER catalytic activity. Compared with TiO2, the IPCE value of TiO2/CuNi2S4 is 2.59% at 635 nm, and that of TiO2 is a mere 0.002%. The separation efficiency and injection efficiency increase from 2.49% and 31.52% to 3.61% and 87.77%, respectively. At 1.23 V vs. RHE, the maximum photocurrent density is 0.26 mA/cm2, which is 2.6 times than that of TiO2 (0.11 mA/cm2), and can be maintained at 0.25 mA/cm2 for at least 2 h under light illumination. Moreover, a hydrogen production rate of 4.21 μmol⋅cm−2⋅h−1 is achieved within 2 h. This work provides a new idea for the application of TiO2 in the field of PEC water splitting and the construction of efficient and stable photoelectronic devices.
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高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Jiahao He,Zhijiang Liu,Wenlu Zhang,Chong He,Wenbin Li
Vectran fabrics are widely employed as the key material for the manufacturing of stratospheric airship. Nonetheless, Vectran faber would decompose due to the UV aging during the prolonged flying process. Herein, atomic layer deposition (ALD) technology was introduced to coat TiO 2 nanolayers on the surface of Vectran fabrics. Titanium isopropoxide liquid was employed as the Ti source precursor throughout the deposition process. Compared with sol-gel vacuum infiltration technic, ALD modified Vectran yarns possessed higher surface uniformity, better UV blocking performance and lower density. Notably, thickness of the TiO 2 nanocoating prepared through the ALD method was adjustable, which can optimize the UV resistance of Vectran yarn without significantly affect its density. Additionally, the nanolayer interface can induce structural coloration on the Vectran strand via diffraction phenomena. These outstanding merits endow ALD technic a promising choice to modify the surface of Vectran fiber used as the skin of stratospheric airships.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 99
·期 2
·415-425
·
IF 3.4
Mingliang Chen,Guanghui Wang,Jialing Dai,Haifeng Li,Nansheng Deng
BACKGROUND There is increasing concern regarding the rising issue of Cr(VI) pollution in aqueous solutions. It is crucial to find an effective technology for the removal of Cr(VI) in aqueous solutions. In this work, a novel TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst was successfully prepared by a simple hydrothermal method and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, photoluminescence, ultraviolet–visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic reduction behavior of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 heterostructure was investigated under visible light irradiation, and the possible mechanism of photocatalytic reduction of Cr(VI) was elucidated. RESULTS The TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst exhibited better photoreduction activity for Cr(VI) under visible light irradiation. After 100 min irradiation with visible light, the TiO 2 /BC/g-C 3 N 4 photocatalyst achieved a removal efficiency of 89% for Cr(VI). Compared with TiO 2 , TiO 2 /BC and TiO 2 /g-C 3 N 4 , the photocatalytic removal efficiency of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 increased by 40%, 20% and 10% respectively. The photocatalytic reduction of Cr(VI) was dependent on the initial concentration of Cr(VI), catalyst dosage, pH value and atmosphere. Moreover, TiO 2 /BC/g-C 3 N 4 presented excellent stability and reusability after five cycles. CONCLUSION The TiO 2 /BC/g-C 3 N 4 heterojunction enables highly efficient photocatalytic reduction of Cr(VI) under visible light irradiation. This enhancement is primarily attributed to the construction of an indirect Z-scheme TiO 2 /BC/g-C 3 N 4 heterojunction, which significantly improves the separation efficiency of photo- generated charge carriers during the photochemical process. Furthermore, the presence of BC enhances the adsorption performance of Cr(VI) on TiO 2 /BC/g-C 3 N 4 , thereby facilitating its photocatalytic reduction. © 2023 Society of Chemical Industry.
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POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Yuhao Zhao,Yuxuan Li,Yuze Dai,Ying Zhang,Min Jiang,Guangyuan Zhou
As a candidate of fossil-based poly(ethylene terephthalate) (PET), bio-based poly(ethylene 2,5-furandicarboxylate) (PEF) that could be converted from renewable resources has attracted attention from academia and industry. Here, we prepare a series of new type of PEF/TiO 2 NWs composites from 2,5-furandicarboxylic acid (FDCA), ethylene glycol (EG), titanium dioxide nanowire (TiO 2 NWs, diameter∼100 nm, length∼20 µm) and dipentaerythritol (Di-PE) via in-situ polymerization. The TiO 2 nanowires (0.5∼10 wt‰ based on PEF) and Di-PE (3 mol‰ based on FDCA) were added as fillers and extenders. TiO 2 nanowires were distributed in the PEF uniformly, shown by SEM. Compared with pure PEF, the T g and thermal stability of all nanocomposites got improved. And the impact strength of nanocomposites could reach 60 kJ/m 2 in contrast to brittle pure PEF. The UV-A and blue-light shielding of nanocomposites increased from 53 % to 98 % and 28 % to 86 %, respectively, and the nanocomposites still maintained good gas barrier properties. Moreover, the antibacterial activity of nanocomposites against E. coli had increased to 98 %, better than that of the PEF/Ag NWs composites. By uniaxial pre-stretching, the tensile modulus and the elongation at break were improved obviously, from 1840 MPa to 5466 MPa and 4 % to 54 % respectively with pre-stretching ratio increasing. Compared to the PET/TiO 2 NWs composites, the PEF/TiO 2 NWs composites shows batter thermal property and mechanical property. The PEF/TiO 2 NWs composites exhibit potential foreground in the packaging application.
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高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2023
·Vol. 220
·期 23
·2300612
·
IF 2
Yuanyuan Zhu,Mengyao Chen,Lixin Wang,Hong Wei,Jing Zhou,Changwei Zou,Yong Liu,Rui Xiong,Hongjun Wang
2D organic–inorganic layered halide perovskites have received tremendous interest as promising materials in electronics owing to their outstanding physical properties. However, the quantum confinement effect leads to the suppression of ion migration in the out-of-plane direction, restricting their applications in resistive switching (RS) memories with vertical structure. Herein, the 2D layered perovskite incorporated with TiO 2 nanoparticles, denoted as TiO 2 –PEA 2 PbBr 4 , is employed, as the functional layers to construct RS memory devices with Al/TiO 2 –PEA 2 PbBr 4 /ITO structure. As compared to pure 2D layered perovskite counterparts without switching behaviors, the Al/TiO 2 –PEA 2 PbBr 4 /ITO memories demonstrate stable bipolar RS behaviors, along with striking characteristics, including the relatively centralized set/reset voltages, a large on/off ratio (≈10 2 ), and a long retention time (10 4 s). In addition, the devices also present the multilevel storage capability by controlling the compliance current. Moreover, the RS behaviors are attributable to the formation/rupture of synergy bromine and oxygen vacancy conductive filaments, owing to their migration/distribution of oxygen/bromine ions under electric fields. The oxide nanoparticles incorporation route provides an effective strategy for improving RS performance in 2D layered perovskite-based RS memories.
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危险品化学品经营许可证（带存储）