SEPARATION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.718
Rui Feng,Xin Hu,Yuxin Ma,Liping Sun,Yaying Lv,Kyung Ho Row,Tao Zhu
PS-DVB-TiO2 modifying with amino (polyethyleneimine or polyaniline) were synthesized, and they were characterized by scanning electron microscopy, fourier transform infrared spectroscopy, thermogravimetric analysis, and Brunauer Emmett Teller. The obtained polymers were used for purification of myricetin and quercetin from Epipremnum aureum rhizome by pipette-tip solid-phase extraction. The satisfactory extraction recoveries for the two targets (myricetin 86.39% and quercetin 83.67%) were obtained by changing different washing and eluted solvents. The result showed that the obtained modified PS-DVB exhibited high mechanical strength and special selectivity to the targets, and the proposed method was successfully applied for purifying complex samples with PT-SPE.Abbreviation PS-DVB: poly (styrene-divinylbenzene); PEI: polyethyleneimine; PANI: polyaniline; SPE: solid-phase extraction; MIP-SPE: molecularly imprinted solid-phase extraction; UAE: ultrasound-assisted extraction; MSPD: molecularly imprinted-matrix solid phase dispersion; PT-SPE: Pipette-tip solid-phase extraction; DMF: N, N-Dimethylformamide; SEM: scanning electron microscopy; TGA: thermogravimetric analysis; FT-IR: fourier transform infrared spectroscopy; BET: Brunauer Emmett Teller.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yiran Tian,Hongmei Liu,Ying Chen,Chenjie Gu,Guodong Wei,Tao Jiang
Sophisticated surface-enhanced Raman scattering (SERS)-active nanocomposites with both self-correction and cleaning capabilities provide new perspectives for the quantitative detection and degradation of hazardous molecules. In this work, a multifunctional GO-coated Fe3O4@TiO2@AuAg SERS substrate was developed. Attributed to the magnetic core, a relatively uniform substrate was induced by an external magnetic field and a sensitive SERS-based detection of trace mixed additives in foods was facilitated by electromagnetic enhancement from the well-modified Au/Ag binary nanoparticles in conjunction with the molecular enrichment ability of the GO. Particularly, the intrinsic Raman signal at 149 cm–1 of TiO2 was fully exploited to act as an intrinsic internal standard for the improvement of the quantitative level of such detection. Additionally, the efficient green elimination of these target molecules within 60 min was enabled by the multifunctional TiO2 layer. It is expected that this novel SERS substrate with both quantitative analytical and photocatalytic capability may extend to a broad application for detecting analytes in complex systems.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 30
·14953-14964
·
IF 3.553
Lv Bo,Xia Lihong,Yang Yu,Wang Xiaoming,Yin Chen,Li Yaoping,Zhang Fuqin
Carbon fibers (CFs) and TiH 2 were used as raw materials to grow TiC on the surface of CFs in a molten salt system. After hydrothermal reaction with sodium hydroxide, part of TiC was converted into sodium titanate. The sodium ions were substituted by H + by the hydrochloric acid solution treatment. CFs@TiC/TiO 2 composite was generated after high-temperature treatment. XRD, Raman, XPS, SEM, and AFM were used to characterize the structure and morphology of the composites. Results showed that a porous TiC film layer was homogeneously formed which was evenly wrapped on the surface of CFs. Through hydrothermal, displacement, and calcination processes, part of TiC was transformed into anatase TiO 2 with controllable morphology. Photocatalytic degradation experiments by the composite catalysts were carried out. The chemical reactions involved in the formation of composite structures and their effects on photocatalysis were analyzed and discussed. Notably, the morphology characteristics of the heterogeneous structure has a marked impact on the photocatalytic degradation of organic pollutants and photocatalytic reduction of hexavalent chromium [Cr(VI)]. Furthermore, the composites can be easily recycled and reused with good reactivity.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 33
·5481-5490
·
IF 3.117
Liruhua Zhang,Qianhong Shen,LiXing Yu,Feilong Huang,Changteng Zhang,Jiansong Sheng,Fang Zhang,Di Cheng,Hui Yang
A novel Bi2MoO6/N–TiO2 hierarchical heterostructure photocatalyst was successfully fabricated through the in situ growth of Bi2MoO6 nanosheets on rough N–TiO2 nanorods with a bark-like surface, and the structure–property relationship of this composite material was researched. The results show that the unique bark-like morphology of N–TiO2 leads to superior adsorption ability, and also provides effective growth sites for Bi2MoO6 nanosheets. The growth of Bi2MoO6 nanosheets leads to the formation of a hierarchical structure, therefore increasing the adsorption ability. The heterostructure between Bi2MoO6 and N–TiO2 promotes the highly efficient separation and transfer of photogenerated carriers. These features make the Bi2MoO6/N–TiO2 composite photocatalyst exhibit outstanding photocatalytic activity, and the optimal photocatalytic degradation rate for tetracycline hydrochloride (20 mg L−1) is up to 93.76% in 90 min under weak-visible-light irradiation (5 W, LED, λ > 400 nm). After five cycling runs, the composite photocatalyst still maintains high photocatalytic activity. Holes and superoxide radicals are confirmed to be the main reactive species in the photocatalytic reaction over the Bi2MoO6/N–TiO2 composite photocatalyst.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Yansheng Li,Si Zhang,Na Li,Jin Wang,Chaofan Jin,Liyan Zheng,Qiue Cao
To obtain an electrochemical sensor with high sensitivity and good selectivity for determination of podophyllotoxin (PPT), a kind of graphene composite (rGO@TiO 2 ) with multi-layer structure and excellent conductivity was prepared by hydrothermal treatment of reduced graphene oxide (rGO) and TiO 2 nanoparticles . The composite was characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), and a sensor using rGO@TiO 2 as a signal amplification element was fabricated by in-situ polymerization of PPT imprinted membrane (PPT-MIM) on the rGO@TiO 2 modified glassy carbon electrode (PPT-MIM/rGO@TiO 2 /GCE). The structure and electrochemical performance of PPT-MIM/rGO@TiO 2 /GCE as well as the mechanism with superior conductivity of rGO@TiO 2 exceeding the ones of the mixture of TiO 2 and rGO (TiO 2 -rGO) or the pure TiO 2 and rGO were explained with different technologies. Under the optimal conditions, the present sensor showed a linear response for the determination of PPT by differential pulse voltammetry (DPV) in the range of 1.0 × 10 −9 − 1.0 × 10 −7 mol L −1 (R 2 = 0.9980) and 1.0 × 10 −7 − 3.0 × 10 −4 mol L −1 (R 2 = 0.9991) with the limit of quantification is 1.0 × 10 −9 mol L −1 and the limit of detection of 3.0 × 10 −10 mol L −1 . The sensor not only possesses high sensitivity and good selectivity, but also exhibits excellent repeatability and stability. It has been used to detect PPT in real samples (including Podophyllum hexandrum , human urine and human whole blood) with satisfied recoveries of 92.0%–102.3%.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 95
·期 6
·1756-1772
·
IF 2.75
Guanshu Li,Yuejiao Cao,Ludong Yi,Jun Wang,Youtao Song
BACKGROUND The recovery and reuse of sonocatalysts are the pivotal issues in the sonocatalytic degradation of organic pollutants. The use of some natural minerals as the carrier is not only beneficial to recycling of sonocatalysts, but also reduces the treatment costs of organic pollutants. Two kinds of hydroxyapatite (HAP), Ox Bone (OB)-HAP and synthesized (Syn)-HAP combine with the Pt-TiO 2 /(Er 3+ :Y 3 Al 5 O 12 @Ta 2 O 5 ) (P-TET) composite, obtaining two Z-scheme sonocatalysts, P-TET/OB-HAP and P-TET/Syn-HAP, respectively. The sonocatalytic activities of the prepared samples are investigated via degradation of prometryn and disinfection of Escherichia coli . RESULTS A series of characterizations showed that the Z-scheme P-TET/(OB or Syn)-HAP sonocatalysts were prepared successfully. To evaluate their sonocatalytic activities, some influencing factors such as ultrasonic irradiation time, inorganic oxidants, used times and trapping agents on the sonocatalytic degradation prometryn were determined. The best degradation ratio (80.31% based on N computing and 85.07% based on S atom computing) of prometryn could be obtained for 10 mmol L −1 K 2 S 2 O 8 , 1.0 g L −1 P-TET/OB-HAP sonocatalyst and 150 min ultrasonic irradiation. The excellent sonocatalytic disinfection ratio (88.65%) of E. coli could also be obtained under 40 min ultrasound irradiation. Moreover, a possible mechanism on sonocatalytic degradation of prometryn was illustrated. CONCLUSION The treated bovine bone HAP was directly used as a carrier to combine with P-TET to construct a novel Z-scheme P-TET/OB-HAP sonocatalyst. The high degradation ratio of prometryn and disinfection ratio of E. coli showed that P-TET/OB-HAP could be a promising sonocatalyst for the degradation of organic pollutants and the disinfection of bacteria. © 2020 Society of Chemical Industry
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 6
·1302
·
IF 3.057
Danning Kang,Jun Li,Yuyao Zhang
Titanium dioxide (TiO2), as a potential anode material applied for lithium-ion batteries (LIBs), is constrained due to its poor theoretical specific capacity (335 mAh·g−1) and low conductivity (10−7-10−9S·cm−1). When compared to TiO2, NiO with a higher theoretical specific capacity (718 mAh·g−1) is regarded as an alternative dopant for improving the specific capacity of TiO2. The present investigations usually assemble TiO2and NiO with a simple bilayer structure and without NiO that is immersed into the inner of TiO2, which cannot fully take advantage of NiO. Therefore, a new strategy was put forward to utilize the synergistic effect of TiO2and NiO, namely doping NiO into the inner of TiO2. NiO-TiO2was fabricated into the nanofibers with a higher specific surface area to further improve their electrochemical performance due to the transportation path being greatly shortened. NiO-TiO2nanofibers are expected to replace of the commercialized anode material (graphite). In this work, a facile one-step electrospinning method, followed by annealing, was applied to synthesize the Ni-doped TiO2nanofibers. The Ni doping content was proven to be a crucial factor affecting phase constituents, which further determined the electrochemical performance. When the Ni doping content was less than 3 wt.%, the contents of anatase and NiO were both increased, while the rutile content was decreased in the nanofibers. When the Ni doping content exceeded 3 wt.%, the opposite changes were observed. Hence, the optimum Ni doping content was determined as 3 wt.%, at which the highest weight fractions of anatase and NiO were obtained. Correspondingly, the obtained electronic conductivity of 4.92 × 10−5S⋅cm−1was also the highest, which was approximately 1.7 times that of pristine TiO2. The optimal electrochemical performance was also obtained. The initial discharge and charge specific capacity was 576 and 264 mAh·g−1at a current density of 100 mA·g−1. The capacity retention reached 48% after 100 cycles, and the coulombic efficiency was about 100%. The average discharge specific capacity was 48 mAh·g−1at a current density of 1000 mA·g−1. Approximately 65.8% of the initial discharge specific capacity was retained when the current density was recovered to 40 mA·g−1. These excellent electrochemical results revealed that Ni-doped TiO2nanofibers could be considered to be promising anode materials for LIBs.Keywords:electrospinning;Ni doping;TiO2nanofibers;phase transition;lithium ion battery
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 23
·7920-7931
·
IF 4.174
Shuang Wang,Yujie Wang,Linghan Li,Lei Li,Guoyuan Fu,Rui Shi,Xinyu Zou,Zhijuan Zhang,Fang Luo
As environmental pollution and energy shortages have become global concerns, the construction of highly efficient catalysts using facile and green methods remains a long-term goal. In the present study, we proposed a facile catalyst preparation method in which Ag/TiO2 composites were coated on the surface of the porous pure inorganic crystalline vanadium phosphates (VPO) by a one-step strategy. More importantly, the in situ reduction of Ag nanoparticles was achieved at room temperature without severe conditions or hydrogen atmosphere in which the porous VPO was employed as the reductant. The prepared Ag/VPO@TiO2 composites act as a class of efficient bifunctional catalysts for visible light photodegradation of MB molecules and catalytic reduction of p-nitrophenol (4-NP). Among these samples, the 6.82%Ag/VPO@TiO2 composite exhibited a superior photocatalytic activity in the degradation of MB and an ultrafast reduction rate for 4-NP of about 0.1 mM/40 s. The photocatalytic mechanistic studies revealed that the encapsulated VPO with a narrow band gap not only efficiently enhances the photosensitivity of the TiO2 but also largely facilitates the photogenerated charge separation. The subsequent deposition of Ag NPs is able to further promote electron transfer ability, which leads to the higher photocatalytic activity. Moreover, the contact of Ag NPs with the surface of semiconductor TiO2 can result in an electron-enhanced area in their interface that could effectively facilitate the uptake of electrons by the 4-NP molecules and then improve the reduction activity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yunlei Zhou,Yue Wang,Shurong Li,Xi Fang,Huanshun Yin,Po Wang,Shiyun Ai
Photoelectrochemical (PEC) immunosensor was designed to detect N 1 -methyladenosine (m 1 A), where BiVO 4 /g-C 3 N 4 heterojunction was employed as photoactive material, polyamidoamine (PAMAM) and 4-carboxyphenylboronic acid (CPBA) were used as m 1 A antibody immobilization matrix, and Ti-based metal-organic framework encapsulated heterostructure of TiO 2 @NH 2 -MIL-125(Ti) was adopted as signal amplification. Due to the interaction between TiO 2 and phosphate, TiO 2 @NH 2 -MIL-125(Ti) was captured after immunoreaction between m 1 A and its antibody, which can further improve the detection sensitivity with increased PEC response. Under optimal experimental conditions, this method presented wide dynamic range (0.05–35 nM) with the low determination limit (16.7 pM, S/N = 3). This detection strategy showed good detection reproducibility, stability and selectivity. This method was applied to assess the effect of antibiotics on m 1 A content in the leaves, stems and roots of rice seedlings.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jiao Wang,Yilin Liu,Lin Cheng,Rongsheng Chen,Hongwei Ni
Nickel-based enzymeless glucose sensors have been extensively explored. However, poor conductivity and severe aggregation of nickel-base nanocomposites often reduce the performance of its practical applications. Herein, free-standing TiO 2 /C core-shell nanofiber arrays (TiO 2 /C NFAs) were fabricated directly on a titanium foil to serve as the one-dimensional (1D) conductive substrate. Nickel-cobalt binary nanoparticles were then deposited on the nanofibers to form the NiCo/TiO 2 /C NFAs for enzymeless glucose sensing. The NiCo/TiO 2 /C NFAs exhibit much improved sensitivity and excellent stability towards glucose determination, with a wide linear range from 1 μM to 7658 μM, and a high sensitivity of 975.3 μA mM −1 cm −2 . The detection limit is calculated to be 0.6 μM (S/N = 3). The NiCo/TiO 2 /C NFAs also show excellent selectivity with minimal interference from the coexistent species. The superior analytical performance should be attributed to the large specific surface area of the 1D nanostructure , direct electron transfer pathway via the free standing TiO 2 /C NFAs, and high activity of the binary Ni–Co electrocatalyst .
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Tong Chang,Yajun Hou,Fengze Wang,Yumei Wang,Yushui Bi
Semiconductor photocatalyst materials based on TiO 2 are potential photosensitizers for photodynamic therapy of cancer. Despite its effectiveness under ultraviolet light, pure TiO 2 shows almost no photocatalytic activity under visible light because of its wide intrinsic band gap energy (anatase, 3.2 eV). Besides, TiO 2 has no magnetic delivery property. In this study, an inorganic nanocomposite, N-TiO 2 /SiO 2 /Fe 3 O 4 , is successfully prepared in three steps by means of co-precipitation, Stöber and sol-gel methods. Deep characterization results by XRD , TEM, XPS , UV–vis DRS, FL and magnetic hysteresis loop reveal that N-TiO 2 /SiO 2 /Fe 3 O 4 has core-shell structure, magnetic property and visible-light-response capability. As a potential photosensitizer for photodynamic therapy, it shows a stronger photodynamic suppression effect on proliferation of HeLa cells than TiO 2 under the irradiation of xenon light.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2019
·Vol. 20
·期 5
·1184
·
IF 4.183
Zhibiao Feng,Lele Li,Qiannan Wang,Guangxin Wu,Chunhong Liu,Bin Jiang,Jing Xu
Whey protein nanofibrils (WPNFs) can be used in edible films and coatings (EFCs) because of its favorable functional properties, which rely on its well-orderedβ-sheet structures, high hydrophobicity, homogeneous structure, and antioxidant activity. In the present study, WPNF-based edible coatings with glycerol (Gly) as plastic and titanium dioxide nanotubes (TNTs) as antimicrobial agents were studied. TNTs not only showed greater antibacterial activity than titanium dioxide nanoparticles (TNPs), but also increased interactions with WPNFs. The WPNF/TNT film had a smooth and continuous surface and was homogeneous with good mechanical properties. WPNF/TNT edible coatings (ECs) can help improve lipid peroxidation and antioxidant activity, limit microbial growth, reduce weight loss, and extend the shelf life of chilled beef. Given that the WPNF/TNT film components are low cost and show high antioxidant and antimicrobial activity, these optimized films have potential applications for various food products, including raw and chilled meat.Keywords:protein nanofibrils;edible coating;antioxidant activity;antimicrobial activity
✓ 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）