JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 4
·1-7
·
IF 2.009
Xie Chong,Shi Jian-Wen,Yang Shenghui,Li Xifei
The MnO x -TiO 2 /MWCNTs nanocomposites were used as De-NO x catalysts to study the deep-rooted reason for the deactivation. Based on a series of characterization on as-prepared catalyst and poisoned catalyst, the results showed that the chief culprit for the deactivation is the micropores in the De-NO x catalyst. The formed ammonium (bi)sulfate in the micropores during the SCR reaction process could not be took away by the gas flow soon and then deposited on the catalyst surface gradually, and further covered the active sites. And the poisoned catalysts could be recovered partly rather than fully by heat treatment at 500 °C because of the decomposition of the ammonium (bi)sulfate and the phase transition of the TiO 2 .
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Dandan Fang,Xiangqin Zheng,Huan Yi,Hong Dai,Zhensheng Hong,Yiru Peng,Yanyu Lin
A highly sensitive electrochemiluminescence (ECL) immunosensor was fabricated for the quantitative analysis of deoxynivalenol (DON) based on an effective all-in-one bioprobe that composed of TiO 2 -B with Fluoro-coumarin silicon phthalocyanine (F-couSiPc) and luminol. Herein, TiO 2 -B with large specific area was served as a favorable carrier, greatly increased the loading of enhancer F-couSiPc and luminophore luminol, resulting in the tremendous enhancement of ECL signal. Specifically, F-couSiPc as coreaction accelerator could facilitate the decomposition of dissolved O 2 to generate substantial reactive oxygen species (ROS) to participate in the ECL reaction of luminol. Additionally, the prepared PEDOT/HA@mp MnO 2 was employed as the sensing platform of biosensor, which can not only capture substantial antibody to improve the sensitivity, but also could expedite the electronic transmission rate to make the ECL intensity further amplified. Ultimately, the proposed immunosensor presented favorable performance for the determination of DON, such as high sensitivity, good stability, wide liner range (from 1.0*10 −6 ng/mL to 10 ng/mL) and a low detection limit of 3.3*10 -7 ng/mL.
✓ 已验证
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 42
·15889-15896
·
IF 8.307
Yuxiang Ma,Yumin Zhang,Yiwen Ma,Tianping Lv,Bin Xiao,Xinya Kuang,Xiyu Deng,Jin Zhang,Jianhong Zhao,Qingju Liu
Single atom catalysts (SACs) have an extremely high atom utilization and distinctive structures and properties in the field of photocatalysis. However, the premise of conducting scientific research and applications is still the stability and catalytic activity of single atoms on suitable substrates. Metal organic frameworks (MOFs), as one of the most suitable single-atom substrates, have tunable internal structures, unsaturated coordination bonds, and high specific surface areas. In this work, Ti-based MOF, MIL-125, was adopted as the precursor to prepare mesoporous Cu-loaded TiO2. During the synthesis of MIL-125, a Cu source was added, and Cu atoms were fixed by partly replacing Ti atoms in the Ti–O octahedron to coordinate with O atoms, resulting in a good dispersity, good stability and high loading amount. Experimental investigations demonstrated that dispersed Cu single atoms act as reaction centres, besides being able to accelerate the transfer of photoelectrons. Under simulated sunlight, the H2 evolution rate of the optimum Cu–TiO2 sample reaches 17.77 mmol g−1 h−1, nearly 101 times higher than that of the pure mesoporous TiO2. The apparent quantum efficiency (AQE) is 20.15% under 365 nm irradiation. This research opens a new thinking to preparing high stability and high activity single atom photocatalysts.
✓ 已验证
DOI
高影响因子
ChemPlusChem
·
2019
·Vol. 84
·期 5
·474-480
·
IF 3.441
Yu Fang,Yuanyuan Li,Feng Zhou,Peiyang Gu,Jiadi Liu,Dongyun Chen,Najun Li,Qingfeng Xu,Jianmei Lu
Graphical Rapid removal : A photocatalyst comprising black TiO 2 nanoparticles (BTNs) grown in situ on a porous carbon material (PC) can be used for the efficient photocatalytic degradation of antibiotics and pollutants. Under visible-light irradiation, the photogenerated electrons of BTNs react with O 2 to generate . O 2 − radical species and holes (h + ) which can decompose the adsorbed antibiotics. The PC allows a more efficient adsorption as well as rapid transport of charge carriers and provides more active sites. Porous carbon (PC) materials with high surface area can separate electron–hole pairs and adsorb organic pollutants more effectively. A series of nanocomposites were prepared by anchoring black TiO 2 nanoparticles (BTN) onto PC through a calcination process. Chemical and structural features of samples were examined by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, powder X-ray diffraction (P-XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. The resulting adsorption-photocatalysis synergistic effect led to a dramatically improved photocurrent for BTN@PCs, thus indicating the high photocatalytic performance toward water-soluble organic species. For instance, the degradation of tetracycline under visible light reached 90 %, which is higher than that for activated carbon doped onto BTN (57 %) without any additional agents. Moreover, the degradation of other antibiotics (such as oxytetracycline and ciprofloxacin) and methylene blue were also studied, thus showing that this system has the potential to be used for water treatment.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Wei Chen,Juan Zheng,Yarong Fang,Yutao Wang,Jinpeng Hu,Yuhua Zhu,Xiaoxiao Zhu,Weihao Li,Qian Zhang,Chuanqi Pan,Baojian Zhang,Xiaofeng Qiu,Sibo Wang,Shuang Cui,Jinlong Wang,Jinsong Wu,Zhu Luo,Yanbing Guo
Typically, SO2 unavoidably deactivates catalysts in most heterogeneous catalytic oxidations. However, for Pt-based catalysts, SO2 exhibits an extraordinary boosting effect in propane catalytic oxidation, but the promotive mechanism remains contentious. In this study, an in situ-formed tactful (Pt–S–O)-Ti structure was concluded to be a key factor for Pt/TiO2 catalysts with a substantial SO2 tolerance ability. The experiments and theoretical calculations confirm that the high degree of hybridization and orbital coupling between Pt 5d and S 3p orbitals enable more charge transfer from Pt to S species, thus forming the (Pt–S–O)-Ti structure with the oxygen atom dissociated from the chemisorbed O2 adsorbed on oxygen vacancies. The active oxygen atom in the (Pt–S–O)-Ti active structure is a robust site for C3H8 adsorption, leading to a better C3H8 combustion performance. This work can provide insights into the rational design of chemical bonds for high SO2 tolerance catalysts, thereby improving economic and environmental benefits.
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2019
·Vol. 53
·期 5
·055504
·
IF 2.829
Shixin Wei,Qiong Fu,Yang Liu,Qian Ji,Yafei Hou,Laihui Luo,Weiping Li
An enhanced energy storage ability, under a low operating electric field, was achieved in Fe3O4@TiO2-P(VDF-HFP) composite films. The low conductivity TiO2 layer was coated onto the high polarization Fe3O4 to construct Fe3O4@TiO2 core–shell fillers for decreasing filler fraction and alleviating conductivity contrast. For instance, the 2 vol.% Fe3O4@TiO2-P(VDF-HFP) film shows a discharged energy density and energy efficiency of 8.6 J cm−3 and 61.7%, respectively, under a low operating electric field of 261.9 kV mm−1. The coated TiO2 and modified –OH groups not only restrict the adverse effects (such as high conductivity, easy agglomeration, etc) caused by Fe3O4, but also contribute greatly to the improvement of polarization and breakdown strength, leading to a significantly improved energy storage performance. Additionally, the present work might possess great potential applications for energy storage owing to the low filler fraction, simple, and low electric filed operation.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Man Chen,Xuezhang Xiao,Meng Zhang,Jiaguang Zheng,Meijia Liu,Xuancheng Wang,Lijun Jiang,Lixin Chen
In this paper, we have synthesized highly dispersed Co metal nanoparticles with the particle size about 5–10 nm on TiO 2 (25–50 nm) for the first time through an extremely facile solvothermal method . It is supposed that the synthesized Co/TiO 2 composite can combine the catalytic advantage of both Co and TiO 2 , exhibiting the superior catalytic effect on the hydrogen de/absorption properties of MgH 2 . The experimental data confirmed the above supposition and demonstrated that Co/TiO 2 additive highly enhances the hydrogen de/absorption kinetics of MgH 2 as compared to separate Co or TiO 2 additive. Specifically, the MgH 2 Co/TiO 2 composite begins to desorb hydrogen at about 190 °C with a low apparent activation energy of 77 kJ/mol. Besides, the MgH 2 Co/TiO 2 composite has a desorption peak temperature of 235.2 °C, which is 53.2, 94.2 and 132.2 °C lower than that of MgH 2 TiO 2 (288.4 °C), MgH 2 Co (329.4 °C) and ball-milled MgH 2 (367.4 °C). Moreover, MgH 2 Co/TiO 2 composite also exhibits low temperature rehydrogenation properties, which can absorb 6.07, 5.56 and 4.24 wt% H 2 within 10 min at the temperature of 165, 130 and 100 °C, respectively. It is supposed that such excellent hydrogen desorption properties and low desorption energy barrier of MgH 2 Co/TiO 2 composite are mainly ascribed to the novel synergistic catalytic effects of Co and TiO 2 . Herein, we propose a novel catalytic mechanism and think that Co/TiO 2 acts as “nano redox reactor”, which can facilitate the dissociation and recombination process of hydrogen, thus reducing the reaction energy barrier and enhancing the de/rehydrogenation of MgH 2 .
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 7
·5333-5342
·
IF 4.123
Shu-xian Wang,Rui-tang Guo,Wei-guo Pan,Ming-yuan Li,Peng Sun,Shu-ming Liu,Shuai-wei Liu,Xiao Sun,Jian Liu
It was well recognized that Pb had a poisoning effect on a SCR catalyst. In this study, the deactivation mechanism of Pb on the Ce/TiO2 catalyst was investigated based on the characterization results of TPD and in situ DRIFT studies. It was found that the addition of Pb on the Ce/TiO2 catalyst not only inhibited the adsorption and activation of NH3 species, but also led to the decrease of the activity of adsorbed NH3 species in the SCR reaction. The adsorption of NOx species and the oxidation of NO by O2 over the Ce/TiO2 catalyst were also suppressed by the addition of Pb, while the reactivity of adsorbed NO2 species did not decrease. Moreover, the results revealed that the NH3-SCR reaction over the Ce/TiO2 catalyst followed both the E–R and L–H mechanisms, while the NH3-SCR reaction over Ce/TiO2-Pb was mainly controlled by the L–H mechanism. The contributions of the L–H mechanism to the SCR reactions over Ce/TiO2 and Ce/TiO2-Pb decreased with increasing reaction temperature. The deactivation of Ce/TiO2-Pb was mainly attributed to the suppressed NH3 adsorption and activation, accompanied by the inhibited NO oxidation and the decrease of Brønsted acid sites.
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Zhihui Zhang,Jianxin Deng,Shiyao Rong,Junyan Wang,Yichen Bao
To further enhance the lubrication performance of composite coatings, this study employed an electrospray masking in-situ forming technology to fabricate textured (CF x ) n /CaF 2 /C-ZrO 2 /TiO 2 composite coatings. Their microstructures, mechanical properties, and reciprocating wear behaviors were investigated. Results showed that this technique could directly create high-quality chessboard microtextures during coating fabrication, integrating multiple materials on a single surface. Compared to non-textured LT samples, the CBM samples demonstrated enhanced coating-substrate adhesion strength (132 N, increased by 11 %), low friction coefficient (~0.09, reduced by 18.2 %) and wear rate (~1.86 × 10 −7 mm 3 ·N −1 ·mm −1 , reduced by 42.4 %) at 25 °C, and excellent self-lubricating performance across 200–600 °C. Mechanism analysis revealed that the chessboard structure exhibited a synergistic effect with the coating materials.
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2015
·Vol. 407
·期 29
·8803-8812
·
IF 3.436
Geng Hao Ran,Miao Shan Shan,Jin She Feng,Yang Hong
A new surface molecularly imprinted polymer (MIP) based on nano-TiO 2 was developed using propazine (Pro) as a template molecule, ethyleneglycol dimethacrylate (EGDMA) as a crosslinker, methacrylic acid (MAA) as a functional monomer, and 2,2′-azobis (isobutyronitrile) (AIBN) as an initiator. Structures of the newly synthesized surface MIPs were characterized by Fourier transmission infrared spectrometry (FT-IR), scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD). The MIP had a good adsorption capacity and high recognition selectivity to propazine. Meanwhile, it exhibited a cross-selectivity for simazine (Sim) and atrazine (Atr). The MIPs were used as a solid phase extraction (SPE) material. Concomitant extraction, purification, and determination of three pesticides (Pro, Sim, and Atr) residues in water, soil, and maize plant and grain samples were performed by MIP-SPE coupled with high performance liquid chromatography (HPLC). The highly selective separation and enrichment of Pro, Atr, and Sim from the complex environmental media can be achieved. Thus, the newly developed technique provides an analytical platform to quantify the trace amount of Pro, Sim, and Atr residues in multi environmental media and food source.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Christine N. Matindi,Sania Kadanyo,Gansheng Liu,Mengyang Hu,Yunxia Hu,Zhenyu Cui,Xiaohua Ma,Feng Yan,Benqiao He,Jianxin Li
Polyethersulphone/sulfonated polysulfone/TiO 2 (PES/SPSf/TiO 2 ) ultrafiltration (UF) mixed matrix membranes (MMMs) were coated with a hybrid layer composed of branched polyethyleneimine (PEI) and TiO 2 nanoparticles (NPs) crosslinked by glutaraldehyde (GA) to enhance its stability. The effect of TiO 2 NPs loadings on the thickness, surface wettability , surface charge and molecular weight cut-off (MWCO) was explored. The corresponding MWCO decreased from 96 kDa for the pristine PES/SPSf/TiO 2 MMM (M0) to 8.5 kDa for PEI-GA@MMMs (M1), and then gradually increased to the range of 15 kDa–40 kDa for PEI-TiO 2 /GA@MMMs. TiO 2 NPs having abundant –OH groups also increased electronegativity and hydrophilicity of the composite membranes. At neutral pH, the zeta potential changed from negative charge of MMMs (−33 mV) into positive charge of M1 (1.3 mV), then into negative charge (−7.4 mV) in the optimum hybrid coated membrane PEI-TiO 2 (0.025 wt%)/GA@MMMs (M3). The underwater oil contact angle (UWOCA) of with hexane , gasoline, dichloromethane and petroleum ether was 165°, 167°, 164° and 135°, respectively. The air/water contact angle (WCA) of M3 was 42°, which is lower than that of M1 (63°). It is important to note that M3 demonstrated a high rejection of different oil-in-water emulsions with <300 nm oil droplets (>90 %) and an improved pure water permeance of 62 LMH bar −1 compared to 44 LMH bar −1 of M1. M3 also exhibited double the antifouling rates of M1 hence corroborating wettability and surface charge results. In summary, our current study provides an available tuning approach to engineering membranes for the treatment of oil-in-water emulsions containing nano-sized oil droplets.
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 2
·166-177
·
IF 1.158
Cao Zhenhao,Li Wenting,Pang Juanjuan,Xu Jingjing,Jiao Yapei,Li Xue
Polyethyleneimine (PEI) modified PluronicF127 block copolymers (PEI-F127-PEI) were synthesized via a chemical reaction of isocyanate and hydroxyl group. By using PEI-F127-PEI block copolymers as templates combined with a sol–gel process, followed by evaporation-driven assembly
and calcination process, mesoporous TiO2 nanomaterials with different phase composition (rutile, anatase/rutile mixture, and anatase) and morphology were prepared. The prepared TiO2 samples were characterized by transmission electron microscopy (TEM), X-ray diffraction
(XRD), UV–vis diffuse reflectance spectrophotometry and N2 adsorption analysis. It is found that the mass ratio of TiCl4/PEI-F127-PEI and calcination temperature have an important influence on the phase composition and morphology of TiO2. Compared to
reported values, the transformation temperature from anatase to rutile decrease. When the mass ratio of TiCl4/PEI-F127-PEI is 2.0/1, the prepared sample exhibits the highest photocatalytic activity for the degradation of methylene blue (MB) under UV light irradiation, indicating
that the mixed anatase/rutile phase TiO2 is an efficient photodegradation catalyst of MB pollutant in wastewater treatment.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）