MOLECULES
·
2022
·Vol. 27
·期 7
·2353
·
IF 4.927
Yuping Zhang,Ning Wang,Zhenyu Lu,Na Chen,Chengxing Cui,Xinxin Chen
Evaluation of the hydrophobic/hydrophilic interaction individually between the sorbent and target compounds in sample pretreatment is a big challenge. Herein, a smart titanium substrate with switchable surface wettability was fabricated and selected as the sorbent for the solution. The titanium wires and meshes were fabricated by simple hydrothermal etching and chemical modification so as to construct the superhydrophilic and superhydrophobic surfaces. The micro/nano hierarchical structures of the formed TiO2nanoparticles in situ on the surface of Ti substrates exhibited the switchable surface wettability. After UV irradiation for about 15.5 h, the superhydrophobic substrates became superhydrophilic. The morphologies and element composition of the wires were observed by SEM, EDS, and XRD, and their surface wettabilities were measured using the Ti mesh by contact angle goniometer. The pristine hydrophilic wire, the resulting superhydrophilic wire, superhydrophobic wire, and the UV-irradiated superhydrophilic wire were filled into a stainless tube as the sorbent instead of the sample loop of a six-port valve for on-line in-tube solid-phase microextraction. When employed in conjunction with HPLC, four kinds of wires were comparatively applied to extract six estrogens in water samples. The optimal conditions for the preconcentration and separation of target compounds were obtained with a sample volume of 60 mL, an injection rate of 2 mL/min, a desorption time of 2 min, and a mobile phase of acetonile/water (47/53,v/v). The results showed that both the superhydrophilic wire and UV-irradiated wire had the highest extraction efficiency for the polar compounds of estrogens with the enrichment factors in the range of 20–177, while the superhydrophobic wire exhibited the highest extraction efficiency for the non-polar compounds of five polycyclic aromatic hydrocarbons (PAHs). They demonstrated that extraction efficiency was mainly dependent on the surface wettability of the sorbent and the polarity of the target compounds, which was in accordance with the molecular theory of like dissolves like.Keywords:titanium wire;superhydrophobic;superhydrophilic;in-tube solid-phase microextraction;high-performance liquid chromatography
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Shulong Wen,Zhuyu Niu,Zhen Zhang,Lianghao Li,Yuancai Chen
Ethylenediaminetetraacetic acid (EDTA) could form stable complexes with toxic metals such as nickel due to its strong chelation. The three-dimensional (3D) macroporous graphene aerogels (GA), which was in-situ assembled by reduced graphene oxide (rGO) sheets on titanium wire as binder-free electrode, was presented as cathode for the degradation of EDTA-Ni in Electro-Fenton process. The X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and Brunauer-Emmett-Teller (BET) results indicated 3D GA formed three dimensional architecture with large and homogenous macropore structure and surface area. Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV) and Rotating Ring-disk Electrode (RRDE) results showed that the 3D GA cathode at pH 3 displayed the highest current density and electrochemical active surface area (ECSA), and better two-electron selectivity for ORR than other pH value, confirming the 3D-GA cathode at pH 3 has the highest electrocatalytic activity and generates more H 2 O 2 . The factors such as pH, applied current density, concentration of Fe 2+ , Na 2 SO 4, and aeration rates of air were also investigated. Under the optimum conditions, 73.5% of EDTA-Ni was degraded after reaction for 2 h. Mechanism analysis indicated that the production of OH on the 3D GA cathode played an important role in the removal of EDTA-Ni in the 3D GA-EF process, where the direct regeneration of Fe 2+ on the cathode would greatly reduce the consumption of H 2 O 2 . Therefore, it is of great promise for 3D-GA catalyst to be developed as highly efficient, cost-effective and durable cathode for the removal of EDTA-Ni.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Xiaojun Pan,Xinmiao Zhang,Gang Wang,Hongye Li,Jiang Li,Jianqiao Song,Shimin Wang,Mengjing Jin,Jinyuan Zhou,Lian Zhou
Omnidirectional detection is widely used in optical tracking systems, omni-directional cameras and optical field measurements and so on. However, the planar structures of ultraviolet (UV) photodetectors (PDs) limit their application in omnidirectional detection. In this work, the NiO nanosheets were fabricated on a titanium (Ti) wire substrate by hydrothermal method and then assembled a photoelectrochemical (PEC) type UV photodetector (PD). Under ultraviolet (UV) irradiation of 35 mW cm −2 @ 365 nm, the PD exhibits a stable photocurrent of 1.53 μA cm −2 and repeatable switching cycles. Also, the PD presents fast response and recovery times of 0.074 s and 0.130 s, respectively. Particularly, the PD based on NiO@Ti possesses excellent response for rotation angles in the range from 0° to 360° under UV light irradiation .
研究领域:
光电子学
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材料科学
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光子学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 37
·15546-15552
·
IF 0
Yitan Li,Lin Wei,Cuncun Wu,Chang Liu,Yanxue Chen,Hong Liu,Jun Jiao,Liangmo Mei
Uniform zinc oxide (ZnO) nanosheet arrays were grown on woven titanium wires using a low temperature hydrothermal method. Photoanodes were prepared by depositing CdS and CdSe quantum dots onto the ZnO nanosheet arrays by a successive ionic layer adsorption and reaction (SILAR) method. Solar cells were assembled using these nanostructured photoanodes and their photovoltaic performance was characterized. The effect of using SILAR cycles for the deposition of quantum dots on the performance of these nanostructured solar cells was investigated systematically. The overall light-to-electricity conversion efficiency of 0.98% was achieved under 100 mW cm−2 illumination for flexible CdS/CdSe co-sensitized solar cells using conventional Pt foils as counter electrodes. To further improve the performance of the flexible solar cells, PbS and Cu2S counter electrodes based on Pb and Cu foils were fabricated. The best conversion efficiencies of flexible CdS/CdSe co-sensitized solar cells using Cu2S and PbS counter electrodes were 3.4% and 2.5%, which demonstrated a significant enhancement in values for short circuit current, open circuit voltage, and fill factor compared to those obtained with the commonly used Pt and Au electrodes.
研究领域:
材料科学
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纳米科技
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能源材料
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光电化学
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半导体器件
✓ 已验证
DOI
ANALYST
·
2011
·Vol. 136
·期 22
·4774-4779
·
IF 3.913
Di Pan,Chunyan Chen,Fei Yang,Yiming Long,Qingyun Cai,Shouzhuo Yao
Titanium wire-based solid phase extraction (SPE) is developed for the analysis of six different polycyclic aromatic hydrocarbons in water samples with coupling with high performance liquid chromatography. The adsorbent is a Ti wire on which TiO2 nanotubes are first formed by anodization and then Au nanoparticles and n-octadecanethiol are modified. The surface composition and structure of the adsorbent were characterized in detail using field emission scanning electron microscope and Fourier transform infrared spectroscopy. The main parameters affecting the extraction efficiency, such as the volume of the organic modifier, extraction time, elution solvent, and desorption time were optimized. Good linearities ranging from 0.025 to 30 μg L−1 with correlation coefficients (R2) ranging from 0.9964 to 0.9999 and low limits of detection were obtained in spiked water samples. Furthermore, this method was successfully applied in the analysis of real river water samples with recoveries in the range of 75.33–115.83% and relative standard deviations ranging from 4.85 to 10.77%. The developed SPE can be a particularly convenient means of sample pretreatment for environmental water samples.
研究领域:
环境科学
·
分析化学
·
水质分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）