MOLECULES
·
2017
·Vol. 22
·期 2
·337
·
IF 2.861
Fang Li,Wai Szeto,Haibao Huang,Jiantao Li,Dennis Y. C. Leung
A photocatalytic rotating disc reactor (PRD-reactor) with TiO2nanowire arrays deposited on a thin Ti plate is fabricated and tested for industrial wastewater treatment. Results indicate that the PRD-reactor shows excellent decolorization capability when tested with methyl orange (>97.5%). Advanced oxidation processes (AOP), including photocatalytic oxidation and photolytic reaction, occurred during the processing. Efficiency of the AOP increases with reduction in light absorption pathlength, which enhanced the photocatalytic reaction, as well as by increasing oxygen exposure of the wastewater thin film due to the rotating disc design. It is found that, with a small dosage of hydrogen peroxide, the mineralization efficiency of industrial biodegraded wastewater can be enhanced, with a superior mineralization of >75% total organic carbon (TOC) removal. This is due to the fact that the TiO2photocatalysis and hydrogen peroxide processes generate powerful oxidants (hydroxyl radicals) that can strongly improve photocatalytic oxidation efficiency. Application of this industrial wastewater treatment system is benefited from the TiO2nanowire arrays, which can be fabricated by a mild solvothermal method at 80 °C and under atmospheric pressure. Similar morphologies and microstructures are found for the TiO2nanowire arrays deposited on a large metal Ti disc, which makes the wastewater treatment process more practical and economical.Keywords:TiO2nanowire arrays;photocatalytic rotating reactor;wastewater treatment
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
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 39
·395602
·
IF 3.551
Hongchao Geng,Ning Jiang,Chenyi Li,Xingqi Zhu,Yan Qiao,Qingyun Cai
A novel visible light-driven photocatalyst (represented as Mn-CdS/ZCISe/CIS/TiO2) for the passivation of E. coli was prepared with TiO2 nanowires as support and using CuInS2 (CIS) and ZnCuInSe (ZCISe) quantum dots (QDs), as well as Mn-doped CdS (Mn-CdS) nanoparticles (NPs) as sensitizers. The use of CIS and ZCISe QDs and Mn-CdS NPs extends the light harvest region to visible light. The photoelectric conversion efficiency was consequently improved, with a photocurrent density of 12.5 mA cm−2, about 60 times that of pure TiO2 nanowires. The germicidal efficiency of the photocatalyst was assessed by passivation of E. coli, 96% bacteria in 50 ml 105 colony forming units (CFU) ml−1 solution were killed within 50 min. Besides the high efficiency, the composite has good stability and satisfactory recycling performance. The antibiotic mechanism was also performed by using photoluminescence and a scavenging agent of different active matter, revealing that the photo-generated holes play a major role in the sterilization process.
研究领域:
微生物学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Yutang Kang,Shihui Jiao,Boran Wang,Xinyan Lv,Wenwen Wang,Wen Yin,Zhenwei Zhang,Qi zhang,Yumei Tan,Guangsheng Pang
Separation membranes with underliquid dual superlyophobicity have recently caused widespread concern due to their switchable separation of oil–water mixtures and emulsions. However, the fabrication of the reported underliquid dual superlyophobic membranes is difficult, and the design of the underliquid dual superlyophobic surface of these membranes is challenging because of their complex surface composition. Theoretically, underliquid dual superlyophobicity is an underliquid Cassie state attainable by the synergy of the underliquid dual lyophobic surface and the construction of a high-roughness surface. Herein, we fabricated an underliquid dual superlyophobic membrane by combining underliquid dual lyophobic polyvinylidene fluoride (PVDF) and TiO2 nanowires. PVDF-modified TiO2 nanowire membranes with underliquid dual superlyophobicity were prepared via a simple adsorption and filtration approach. PVDF was coated onto TiO2 nanowires to form a PVDF layer with a thickness of 6 nm. The PVDF modification provided flexibility to the fragile TiO2 nanowires membrane and changed its wettability from underwater superoleophobicity/underoil superhydrophilicity to underliquid dual superlyophobicity. The PVDF-modified TiO2 nanowires membrane efficiently separated both oil-in-water and water-in-oil emulsions. The binary cooperative effect between the TiO2 nanowires and the coated PVDF layer was responsible for the underliquid dual superlyophobicity.
研究领域:
材料科学
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界面化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Chenpei Zhou,Dong Zou,Yutang Kang,Shasha Feng,Zhaoxiang Zhong,Weihong Xing
The high gas permeance of ceramic membranes is the most important indicator of hot-gas filtration. Ceramic membranes made of fibers show significant potential for filtering dust-laden gases owing to their high porosity and high gas permeance. A novel method is proposed for preparing a SiC fiber separation layer on a rigid ceramic support that endows the membrane with a high porosity. However, the interfacial adhesion between the support and separation layers was low as there were insufficient connection points. Therefore, a solvothermal method was proposed for the in-situ vertical growth of TiO 2 nanocords on the surface of a SiC support (SiC–TiO 2 ). Next, a SiC fiber separation layer was deposited on the SiC–TiO 2 support to improve the interfacial adherence. The fabrication parameters of the SiC fiber layer, such as the solid content of the coating slurry and sintering procedure of the separating layer, were investigated in detail. At a SiC fiber content of 6 wt%, spray-coating times of 2, and sintering temperature of 1150 °C, a complete fiber layer was successfully deposited on the rigid ceramic support. The resulting membrane had a thickness of 100 μm, porosity of 91%, average pore diameter of 6.8 μm, and gas permeance of 440 m 3 ·m −2 ·h −1 ·kPa −1 . In the filtration of dust-laden gas containing SiO 2 as simulated dust (average particle size, 0.3 μm), the rejection rate was >99.9%; further, after four cycles of filtration–backwashing, the pressure drop was <0.82 kPa. The outlet dust content was less than 0.1 mg m −3 . Moreover, this membrane exhibited superior filtration ability at 500 °C. The findings of this study can aid the fabrication of ceramic fiber membranes with a high gas permeance and high interfacial adherence for industrial applications.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Qingqing Qiu,Yifan Chen,Qiannan Wu,Ping Wang,Dejun Wang,Yanhong Lin,Tengfeng Xie
The inverted type-I CdS-CdSe core-shell structure quantum dots (QDs) (denoted as CdS-CdSe QDs) applied in QDs sensitized solar cells (QDSCs) has attracted wide attention and researches due to its special photoelectric properties. But this post synthesis ligand-assisted (PSLA) technique need to assemble the previously prepared QDs onto the photoanode, leads to the low loadings of QDs and poor photoelectric performances of solar cells. Hence, we elaborately combine the PSLA technique and successive ionic layer absorption and reaction (SILAR) method to assemble the QDs onto the photoanode to improve the loadings of QDs and photoelectric properties of solar cells. The anatase TiO 2 nanowires (NWs) electrode deposited with CdS-CdSe core-shell QDs and CdSe QDs (denoted as CdS-CdSe/CdSe QDs) was successfully prepared by combining the post synthesis ligand-assisted technique and SILAR method. The surface photovoltage (SPV), the transient photovoltage (TPV) and transient photocurrent (TPC) techniques were applied to systematically study the dynamics of charge separation and transfer. These measurements demonstrate that CdS-CdSe/CdSe QDs sensitized TiO 2 NWs photoelectrodes exhibits favorable separation efficiency due to the increase of sunlight utilization. With the polysulfide electrolyte, the maximum photoelectric conversion efficiency (PCE) with the enhanced short circuit current (J sc ) of 17.76 mA/cm −2 for the CdS-CdSe/CdSe QDs and the J sc of 11.4 mA/cm −2 for pure CdS-CdSe QDs were obtained under illumination at 100 mW/cm 2 . To enhance the PCE, the TiO 2 NWs was optimized by N-doped and the optimized PCE of 3.13% with 18.22 mA/cm 2 of J sc was achieved for the QDSCs deposited with CdS-CdSe/CdSe QDs.
研究领域:
材料科学
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能源技术
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光电化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 3
·393
·
IF 4.034
Weili Li,Hongchao Geng,Lu Yao,Kesheng Cao,Pengtao Sheng,Qingyun Cai
Here we present the photoelectrocatalytic hydrogen generation properties of CdS passivated ZnCuInSe (ZCISe) quantum dots (QDs) supported by TiO2nanowires decorated with Ag nanoparticles. In this configuration, Ag nanoparticles were sandwiched between the photo-electrons collector (TiO2) and photo-sensitizers (ZCISe), and acted as an electron relay speeding up the charge carrier transport. ZCISe and CdS enabled the optical absorption of the photoelectrode ranging from ultraviolet to near infrared region, which significantly enhanced the solar-to-chemical energy conversion efficiency. A photocurrent of 10.5 mA/cm2and a hydrogen production rate of about 52.9 μmol/h were achieved under simulated sunlight (1.5 AG).Keywords:ZCISe QDs;TiO2nanowires;photocatalytic;hydrogen generation
研究领域:
材料科学
·
能源科学
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Ziqiang Gong,Na Yang,Zhenxing Chen,Bin Jiang,Yongli Sun,Xiaodong Yang,Luhong Zhang
With the purpose of avoiding the limitation of oil/water density relationship, as well as achieving the continuous separation, two types of filtering materials with inverse wettability have attracted extensive attention. In our work, a superhydrophilic mesh was fabricated via a series of procedures, including the deposition of TiO 2 seed layer on the surface, the growth of TiO 2 nanowires by a hydrothermal method and calcination process. As expected, the as-prepared superhydrophilic mesh turned to be superhydrophobic after the decoration by low surface energy reagent. The formation mechanism of grass-like TiO 2 nanowires was proposed and surface morphological optimization conditions were studied. As for the oil/water application, the T-shaped bidirectional device combining the meshes with inverse wettability was adopted for achieving continuous oil/water separation. Meanwhile, the separation test showed that the separation efficiency of greater than 99% and high flux were obtained for various oil/water mixtures. Furthermore, according to the results simulating the realistic industrial application, the as-prepared meshes exhibited excellent reuse durability and stability in corrosive environment. The extension of TiO 2 nanowires on mesh, cooperating the multiple wettability behaviors could be regarded as a prospective candidate for large-scale oil/water separation.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2017
·
IF 7.78
Xiaoqiang Liu,Xiaohe Huo,Peipei Liu,Yunfei Tang,Jun Xu,Huangxian Ju
In this work, an ultrasensitive immunosensing scaffold was structured with TiO 2 nanowire (TiNW) arrays modified with molybdenum (Mo) and MoS 2 flakes by a triplex “etching, doping and deposition” technique. The triply modification of TiNW arrays improved their electron transfer , and the decoration of MoS 2 flakes on TiNW arrays increased both the conductivity and the specific surface area of TiNW. Accordingly, the triply modified TiNW arrays provided a biocompatible microenviroment for the biomolecules and high specific surface area to load big amount of biomolecules . The immunosensor was prepared by immobilizing capture antibody on the scaffold surface with double amino-reactive crosslinker , and the tracing labels were prepared by immobilizing signal antibody and horseradish peroxidase molecules on cylinder-shaped TiO 2 nanorods . After sandwich-type immunoreaction, the tracing labels were quantitatively captured on the immunosensor surface for the detection of carcinoembryonic antigen as a model analyte. This amperometric method showed a linear range of 0.001 and 150 ng mL −1 with a detection limit of 0.5 pg mL −1 . This work provided a promising platform for sensitive amperometric immunosensing of protein biomarkers.
研究领域:
生物医学工程
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 45
·27050-27057
·
IF 3.119
Yajie Hu,Yanan Yang,Jiejing Zhang,Shengnan Jin,Hong Zheng
The removal of low concentration PPCPs from water is a challenging issue. A graphene hydrogel with 3D networks shows great potential for accelerating eddy diffusion of low concentration PPCPs. Herein, to further promote its molecular diffusion, a graphene/TiO2 nanowires (GNW) hybrid structure was implanted into graphene hydrogel. The as-prepared rGO/GNW hydrogel exhibited significantly enhanced adsorption–photocatalytic performance and excellent stability for low concentration ethenzamide, a typical pharmaceutical pollutant in water, under vacuum ultraviolet (VUV), ultraviolet (UV), visible and near-infrared light irradiation. When the initial ethenzamide concentration was 500 ppb and catalyst dosage was 10 mg/150 mL, ethenzamide was completely removed in 3 min and the corresponding photocatalytic apparent rate constant was 2.20 times that by GNW, 4.09 times that by rGO/P25 and 4.31 times that by rGO/NW under VUV irradiation, respectively, and its removal rate attained 99.0% in 120 min and the corresponding photocatalytic apparent rate constant was 2.06 times that by GNW, 3.34 times that by rGO/P25 and 17.42 times that by rGO/NW under UV irradiation, respectively. The GNW hybrid structure in the hydrogel played a vital role in overcoming the mass transfer resistance of low concentration PPCPs. The as-prepared rGO/GNW hydrogel exhibits significant potential for the removal of low concentration PPCPs from water.
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
Analytical Methods
·
2019
·Vol. 11
·期 23
·2960-2968
·
IF 2.378
Le Peng,Jun Zhou,Zhaoheng Liang,Yaping Zhang,Lucia Petti,Tao Jiang,Chenjie Gu,Danting Yang,Pasqule Mormile
Based on surface-enhanced Raman scattering (SERS) technology, Au@Ag@4MBA@5′-NH2-ssDNA probes and a Ag/TiO2@3′-NH2-ssDNA substrate were prepared and constructed into a sandwich structure to develop a high sensitivity bioassay of miRNA-21. The Au@Ag@4MBA@5′-NH2-ssDNA probes were prepared by immobilizing 5′-NH2-ssDNA onto the surfaces of 4MBA-labelled Au@Ag core–shell nanoparticles, and the Ag/TiO2@3′-NH2-ssDNA substrate was prepared by immobilizing 3′-NH2-ssDNA on the surface of Ag/TiO2 nanowires SERS-active substrates. The experimental results showed that the SERS-based sandwich bioassay of miRNA-21 presented a low limit of detection of 0.75 fM and a broad dynamic range from 1.0 fM to 1.0 nM. Also, the test data for the SERS-based sandwich bioassay were not only consistent with that of the real-time fluorescence quantitative polynucleotide chain reaction (RT-qPCR) method but also displayed higher detection sensitivity. It was shown that the SERS-based sandwich bioassay of miRNA-21 has importance for use in potential applications involving diagnosing clinical cancer patients.
研究领域:
生物技术
·
分子诊断
·
纳米医学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Geshan Zhang,Hanrui Wu,Hangdi Yu,Xiali Zheng,Tian Yuan,Xiaoqiang Jin,Yifan Zheng,Zongjian Liu
Mo 2 N decorated TiO 2 nanowires were obtained via impregnating titanate nanowires with a mixture of (NH 4 ) 6 Mo 7 O 24 and hexamethylenetetramine , followed by the calcination at 600–800 o C in N 2 atmosphere. The results show that only Mo 6+ species can be found in the sample calcined at 600 o C while Mo element is still dominantly in the form of Mo 6+ with a negligible amount of γ-Mo 2 N (namely Mo δ+ , 0 < δ < 4) and Mo 4+ at 700 o C. In the sample calcined at 800 o C, however, ultrasmall γ-Mo 2 N nanocrystals with an average size of about 3.3 nm can be observed on the surface of TiO 2 nanowires. The photocatalytic activity test reveals that, although the γ-Mo 2 N-absent sample obtained at 800 o C is dominantly in the form of inert rutile TiO 2 , the introduction of γ-Mo 2 N nanocrystals can significantly improve its performance to be more than doubled in methyl orange (MO) removal percentage, increasing from 36.5% to 75.5% after 2h irradiation (high-pressure mercury lamp), due to the formation of heterojunction between γ-Mo 2 N and TiO 2 nanowires. Furthermore, 5% γ-Mo 2 N decorated TiO 2 exhibit better photocatalytic activity due to its higher surface area and more heterojunctions between γ-Mo 2 N and TiO 2 . This γ-Mo 2 N decorated TiO 2 photocatalyst can broaden the practical scope of rutile TiO 2 and have a promising potential in photocatalytic application.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Zhansong Zhu,Kaiqiang Sun,Linlin Han,Zhencui Wang
Kanamycin is an antibiotic commonly used for the prevention and treatment of infections. The monitoring of kanamycin is of vital significance for maintaining food safety and safeguarding public health. However, the sensitive and reliable detection of kanamycin under visible light irradiation still presents significant challenges. In this study, a self–supported electrode was fabricated from a titanium dioxide nanowire array modified with gold nanoparticles, utilizing a straightforward and controllable electrochemical deposition method. The synthesized photoanode exhibited enhanced photoelectrochemical performance under visible light, which can be attributed to the localized surface plasmon resonance effect of Au nanoparticles. Kanamycin aptamers served as recognition elements, immobilized on the TiO₂/Au nanowires through Au S bonds. The specific recognition and high affinity between the aptamers and kanamycin contributed to the excellent sensitivity of the photoelectrochemical aptasensor. The sensor demonstrated a linear range of 1–500 nM, with a limit of detection as low as 0.42 nM (S/N = 3). Furthermore, the sensor exhibited remarkable anti–interference capability in the presence of other contaminants and maintained excellent stability. It has been successfully applied for the analysis of kanamycin in real milk samples. The simple, efficient, highly sensitive, selective, and reproducible detection platform for kanamycin developed in this study offers significant potential for a wide range of applications.
研究领域:
生物传感器
·
食品安全
·
分析化学
·
纳米技术
✓ 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）