JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 9
·1-11
·
IF 2.101
Feng Lu,Jiang Heng,Zou Mingming,Xiong Fengqiang,Ganeshraja Ayyakannu Sundaram,Pervaiz Erum,Liu Yinan,Zou Shunying,Yang Minghui
Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microsphere photocatalysts are prepared by a simple sol–gel method with controllable sizes in the range of 400–500 nm and high surface area of 112 m 2 g −1 . Manganous acetate is the Mn source, and ammonia gas is the nitrogen source used. The dopants are found to be uniformly distributed in the TiO 2 matrix. Interestingly, in (Mn,N)-co-doped TiO 2 , we observe an effective indirect band gap of ~2.58 eV. (Mn,N)-co-doped mesoporous TiO 2 microspheres show higher photocatalytic activity than Mn–TiO 2 microspheres under visible light irradiation. Among the samples reported in this work, 0.2 at.% Mn doping and 500 °C 2-h nitriding condition give the highest photocatalytic activity. The observed photocatalytic activity in the (Mn,N)-co-doped TiO 2 is attributed to the contribution from improved absorption due to trap levels of Mn, oxygen vacancies and N doping. Graphical Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microspheres containing substitutional N, interstitial N and O vacancies show high visible light photocatalytic activity.
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2013
·Vol. 180
·期 13
·1325-1332
·
IF 3.434
Wu Ying,Feng Xun,Zhou Shenghai,Shi Hongyan,Wu Hongmin,Zhao Shujie,Song Wenbo
We report on a sensor for epinephrine (EP) that is based on an ITO electrode modified with multi-walled carbon nanotubes pre-coated with a polymerized ionic liquid (PIL-MWNTs). A chitosan film was then electrodeposited on the ITO electrode in the presence of EP (the template) and the PIL-MWNTs. This film acts as an excellent recognition matrix due to its excellent film-forming ability and the many functional groups that favor hydrogen bond formation with the target (EP). The PIL-MWNTs, in turn, can improve the sensing performance due to their good electrical conductivity, high dispersity, and large surface area. The imprinted films were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform IR spectroscopy, and thermogravimetric analysis. The electrochemistry of the imprinted electrode was investigated by cyclic voltammetry, electrochemical impedance spectroscopy, differential pulse voltammetry and chronoamperometry. The response to EP is linear in the 0.2 μM to 0.67 mM concentration range, and the detection limit is as low as 60 nM (at an S/N of 3). The electrode is reusable and offers good reproducibility and stability.
An epinephrine imprinted electrode was facile achieved by electrodepositing chitosan on ITO surface in the presence of epinephrine and polymerized ionic liquid-functionalized carbon nanotubes, followed by removal of the epinephrine template molecule. Specific recognition of EP molecule and its determination were realized at this imprinted sensor.
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 5
·1197-1204
·
IF 3.719
Zhong Anni,Luo Xiaoli,Chen Liping,Wei Shanshan,Liang Yonghong,Li Xinchun
We describe a new electrochemical platform for direct sensing of glucose. The electrode was prepared by controlled electrodeposition of nickel nanoparticles onto carbon nanotubes on a copper electrode. The sensor was optimized by investigating the effects of the concentration of nickel precursor, electrolysis time and acidity of the medium. The nanocomposite was characterized by scanning electron microscopy and energy dispersive spectroscopy. Cyclic voltammetry of glucose in 0.1 M NaOH solution gives a well-defined anodic wave with a peak potential at 0.53 V (vs. Ag/AgCl) that indicates the direct electrooxidation of glucose at the nanomaterial. The electrode responds to glucose over a wide linear range (from 2 μM to 10 mM), with high sensitivity (3.8 mA∙mM −1 ∙cm −2 ) and a low detection limit (0.7 μM). The sensor was applied to the determination of glucose in blood samples, and the results were in good agreement with data obtained by a commercially available glucometer. The method holds promise due to the ease of sensor fabrication and its robust performance and longevity.
An enzyme-free glucose amperometric sensor based on nickel nanoparticle-carbon nanotubes modified copper electrode is described. The sensor is easily fabricated and shows excellent analytical performance.
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Liu Dong-Xue,Deng Xin,Zhu Yong-Fu,Meng Zhe,Sun Xue-Feng,Shi Miao-Miao,Zhong Hai-Xia,Yan Jun-Min
Electrocatalytic reduction of nitrate \(({\rm{N}}{{\rm{O}}_3}^ - )\) and nitride \(({\rm{N}}{{\rm{O}}_2}^ - )\) to ammonia (NH 3 ) is of wide interest as a promising alternative to the energy-intensive Haber-Bosch route for mitigating the vast energy consumption and the accompanied carbon dioxide emission, as well as benefiting for the relevant sewage treatment. However, exploring an efficient and low-cost catalyst with high atomic utilization that can effectively facilitate the slow multi-electron transfer process remains a grand challenge. Herein, we present an efficient hydrogenation of \({\rm{N}}{{\rm{O}}_3}^ - /{\rm{N}}{{\rm{O}}_2}^ - \) species to NH 3 in both alkaline and neutral environments over the Fe 2 (MoO 4 ) 3 derived hybrid electrocatalyst with the metallic Fe site on FeMoO 4 (Fe/FeMoO 4 ). The Mo ingredient can play a synergistically positive role in further promoting the NH 3 production on Fe. As a result, Fe/FeMoO 4 behaves well in the electrochemical NH 3 generation from \({\rm{N}}{{\rm{O}}_2}^ - \) with a maximum NH 3 Faradaic efficiency (FE) of 96.53% and 87.68% in alkaline and neutral electrolyte, corresponding to the NH 3 yield rate of 640.68 and 302.56 \({\rm{mg}} \cdot {{\rm{h}}^{ - 1}} \cdot {\rm{m}}{{\rm{g}}_{{\rm{cat}}.}}^{ - 1}\) , respectively, which outperforms the Fe and Mo counterpart and other similar catalyst, showing the robust catalytic capacity of each active site.
✓ 已验证
DOI
高影响因子
CHROMATOGRAPHIA
·
2020
·Vol. 83
·期 8
·985-992
·
IF 1.596
Zhao Yang,Zeng Jiao,You Junheng,Duan Yuanxing,Li Yuandong,Liu Chunbo,Liu Zhihua,Yang Liu,Shen Qinpeng,Li Zhenjie
A poly ( N -isopropyl acrylamide) (polyNIPA)-based hybrid column for capillary liquid chromatography (cLC) was prepared with N -isopropyl acrylamide (NIPA) and alkoxysilanes through a sol–gel “one-pot” method. In this process, the hydrolyzed tetramethoxysilane (TMOS) and vinyltrimethoxysilane (VTMS) were the precursors for the synthesis of a silica-based monolith and subsequently reacted with organic monomer (NIPA) via free radical polymerization within the confines of a capillary. The effects of polymerization temperature, the volume of TMOS, VTMS, and acetic acid (HAc) as well as the amount of progens [polyethylene glycol 10,000 (PEG10000) and urea] on the morphology and permeability were investigated in detail. Uniform pore structure and good mechanical stability were obtained for columns prepared under optimized conditions. Separation of various neutral, acidic and basic analytes was achieved by cLC in reversed-phase liquid chromatography (RP-LC) mode. Moreover, the resulting hybrid column was also applied for the analysis of small organic pollutants, including polycyclic aromatic hydrocarbons (PAHs), perfluorinated compounds (PFCs) and chlorophenols (CPs). The successful application demonstrated its potential in the separation of small molecules.
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 12
·5571-5580
·
IF 2.961
Wu Meijuan,Wang Liwei,Xu Fugang,Ma Guangran
A Ni-MOF superstructure composed of 2D nanosheet (2D Ni-MOFss) was prepared and further combined with reduce graphene oxide (rGO) for electrochemical detection of acetaminophen (AP). The structure and properties of the 2D Ni-MOFss were characterized by SEM, XRD, XPS, and electrochemical method. The loosened 2D lamella structure endowed the 2D Ni-MOFss with improved electrocatalysis and low charge transfer resistance than bulky Ni-MOF. After integration with rGO, the composite 2D Ni-MOFss/rGO shows significantly enhanced catalysis for redox reaction of AP with high current response and low over-potential. An electrochemical sensor for AP based on the 2D Ni-MOFss/rGO shows a wide linear range of 0.036 to 50 μM, and a low detection limit of 0.012 μM. The sensor with high sensitivity, good selectivity, and stability also show satisfied recovery for detecting AP in real sample. The facile preparation and enhanced catalysis make these 2D MOF composite attractive materials for electrochemical sensors.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 17
·22024-22034
·
IF 2.478
Li Hong,Jiao Jinxu,Ye Qi,Wu Zhixin,Luo Donglian,Xiong Dehua
Quantum dots (QDs) attract extensive attention because of their excellent optoelectronic performance. However, few research has been done on the synthesis of core–shell QDs by one-step thermal injection. Here the CdSe/ZnS core–shell QDs were successfully synthesized by a one-step thermal injection method. The synthesis process of CdSe/ZnS core–shell QDs was investigated from two aspects of reaction time and oleic acid dosage. The results suggest that the reaction time and the dosage of oleic acid have important effects on the optical properties of CdSe/ZnS core–shell QDs. The action mechanism of oleic acid was also explained in this paper. Moreover, highly efficient green quantum dot light-emitting diodes (QLEDs) were fabricated with CdSe/ZnS core–shell QDs on ITO glass substrate by rotary coating method. The minimum starting voltage of 1.91 V and the maximum brightness of 12,057 cd m −2 were achieved in the QLEDs. This study is of great significance for the development of the synthesis of core–shell QDs by one-step thermal injection and QLEDs.
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 12
·1-13
·
IF 1.604
Li Yueqin,Zhou Minya,Li Yun,Gong Qiang,Wang Yiting,Xia Zongbiao
High performance alkoxy-functionalized polythiophene (PM4EOT) and TiO 2 nanocomposites were prepared via a facile in situ oxidative chemical polymerization of thiophene monomer. The morphology studied demonstrated that nanocomposites were of the core–shell structure with a particle size of approximately 30 nm and PM4EOT shell was of about 2–10 nm thickness. X-ray photoelectron spectroscopy (XPS) spectra proved that there was a new Ti–S interaction between the polymer and TiO 2 surface. The supercapacitive behaviors of the nanocomposites investigated by cyclic voltammetry galvanostatic charge–discharge and AC impedance measurements demonstrated that the prepared PM4EOT/TiO 2 nanocomposite [1:1 (weight ratio)] exhibits enhanced specific capacitance and cycling stability as compared to the two pristine components and various ratio contents. The specific capacitance of PM4EOT/TiO 2 nanocomposite (1:1) was obtained up to 111 F/g at a current density of 0.5 A/g, which is much higher than that of the pure PM4EOT (45 F/g) and TiO 2 (1.6 F/g). In addition, the energy density of 15.4 Wh kg −1 and the power density of 308 W kg −1 delivered by composite (1:1) capacitor were achieved at a current density of 0.5 A/g.
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-13
·
IF 4.38
Hu Pan,Shen Shaohang,Yang Hu
Two series of binary graft cationic starch-based flocculants (CS-DMCs and CS-DMLs) with different hydrophilicity and charge density (CD) were prepared by graft copolymerization of acrylamide with 2-(Methacryloyloxy)- N , N , N -trimethylethanaminium chloride and methacrylic acid 2-(benzyldimethylaminio) ethyl chloride, respectively, on the starch (St) backbone. The sludge dewatering performance of CS-DMCs and CS-DMLs were evaluated and compared based on the changes in filter cake moisture content (FCMC), specific resistance of filtration (SRF), fractions and components of extracellular polymeric substances, and various physiochemical characteristics of sludge flocs and cakes. Increase in CD of the St-based flocculants caused improved sludge dewaterability. Under the similar CD, CS-DML with relatively high hydrophobicity exhibited lower FCMC and SRF, larger and denser sludge flocs, and better permeability of sludge cakes than CS-DMCs due to the synergistic effects of charge neutralization, bridging flocculation and hydrophobic association. Furthermore, a second-order polynomial model on the basis of phenomenological theory was successfully applied to quantitatively evaluate the influences of the two important structural factors of these St-based flocculants, i.e., hydrophobicity and CD, on the sludge dewaterability. The structure–activity relationship of the St-based flocculants in sludge dewatering was obtained according to the theoretic simulation. The dewatering mechanisms was discussed in depth on the basis of the experimental and simulated results; besides, the FCMC and optimal dose can be predicted by the established structure–activity relationship. This current work offered a novel and valuable way to exploit and design of low-cost and high-performance graft natural polymeric flocculants applied in efficient conditioning of sludge.
✓ 已验证
DOI
高影响因子
Environmental Earth Sciences
·
2022
·Vol. 81
·期 16
·1-12
·
IF 3.119
Feng Wenchao,Wu Jun,Lu Jian
The high concentration of manganese (Mn 2+ ) in geothermal water will seriously reduce its utilization rate. Manganese sand has been used to rapidly remove Mn 2+ from water. This study investigated the long-term removal of Mn 2+ from simulated geothermal water by manganese sand filtration column system. The average Mn 2+ removal rate from simulated water with the inlet water temperature of 25, 50, 70 °C were 87.4%, 96.2% and 99.0% during the operation of 90 days. The effluent pH did not change much compared with influent pH value (7.6–8.0). The Mn 2+ removal rates during the operation of 90 days with influent concentration of 1, 10, 20 and 50 mg/L were respectively 98.2%, 99.8%, 91.4% and 63.4%. The average removal rates of Mn 2+ were respectively 99.8% and 94.0% with the influent flow of 5.2 mL/min and 10.4 mL/min. The temperature change in the manganese sand filtration column was further explored in this paper. The experiment of filtration column heated/non-heated showed that the manganese sand filtration column heated had a better effect of removal which could run for 152 days. The dispersion coefficient ( D ) analysis derived from inverse modeling showed that a small temperature change in the filtration column system was conducive to the homogenization of manganese sand medium in the column. The Mn 2+ removal process of manganese sand filtration column heated was proposed. Surface characteristics analysis of manganese sand in the column after reaction showed that Mn 2+ removal mainly occurred in the upper part of the filter column. The surface material of manganese sand in the filtration column heated after operation was manganese oxide material mainly composed of Mn 2 O 3 and MnO 2 . These findings suggested the potential of manganese sand in the engineering application of removing Mn 2+ in geothermal water.
✓ 已验证
DOI
高影响因子
JOM
·
2019
·Vol. 72
·期 4
·1687-1693
·
IF 2.305
Xia Yang,Zhao Jinlong,Dong Zhaowang,Guo Xueyi,Tian Qinghua,Zhang Siwen,Liu Yong
Ultra-high pure metallic zirconium powder was successfully obtained through a two-step gradient reduction of nano-ZrO 2 in Ar atmosphere. The first reduction by Mg was to remove ~ 85% oxygen, followed by a heat-treatment step to control the particle size and specific surface area of the powder, and the final reduction by calcium was to further purify the powder and decrease oxygen to an extremely low level (0.068 wt.%). The oxygen level in the final powder meets the standard specification of Zr sponge (ASTM B349/B349M-16). Processing parameters, including the reduction temperature, the amount of Mg and MgCl 2 and the heat treatment temperature, were investigated. Thermodynamic modeling with the assistance of HSC Chemistry software was carried out to understand the reduction reaction. This study offers a novel process for producing ultra-high pure metallic zirconium powder with the potential to replace the conventional Kroll process.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 6
·4649-4657
·
IF 2.019
Jiang Si,Wu Jihuai,Ye Beirong,Fan Yueyue,Ge Jinhua,Guo Qiyao,Huang Miaoliang
We present a facile one-step hydrothermal method to in situ grow nickel selenide (Ni 3 Se 2 ) nanosheets on nickel (Ni) foam (Ni 3 Se 2 /Ni) by using SeO 2 as selenide source, Ni foam as nickel source and NaBH 4 as reducing agent. The mole ratio of NaBH 4 /SeO 2 is optimized as 4:1. An asymmetric supercapacitor (ASC) is fabricated by using as synthesized Ni 3 Se 2 /Ni as positive electrode and activated carbon (AC) as negative electrode. The synthesized materials and assembled devices are measured and characterized by a field emission scanning electron microscopy, powder X-ray diffraction, cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The results shows that the as-synthesized Ni 3 Se 2 /Ni electrode possesses a high specific capacitance of 854 F g −1 at 1 A g −1 . The ASC can steadily operate with a high voltage of 1.6 V in 3 M KOH electrolytes, and possesses a superior energy density of 23.3 W h kg −1 at a power density of 398.1 W kg −1 . In addition, the Ni 3 Se 2 //AC ASC shows excellent charge/discharge stability, after 5000 cycles the capacitance retention reaches 91.11%. The excellent performance of Ni 3 Se 2 /Ni electrode is mainly due to the pseudo-capacitive by Ni 3 Se 2 and the 3D structure of Ni foam.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）