ChemSusChem
·
2018
·Vol. 11
·期 16
·2766-2775
·
IF 7.411
Yunpeng Liu,Yuhang Li,Siyuan Yang,Yuan Lin,Jiangliang Zuo,Hong Liang,Feng Peng
Reduction is considered to be an effective method to improve the photocatalytic activity of TiO 2 ; however, the underlying relationship between structure and photocatalytic performance has not been adequately unveiled to date. To obtain insights into the effect of structure on photocatalytic activity, two types of reduced TiO 2 were prepared from CO (CO-TiO 2 ) and H 2 (H-TiO 2 ). For H-TiO 2 , Ti−H bonds and oxygen vacancies are formed on the surface of H-TiO 2 , which results in a more disordered surface lattice. However, for CO-TiO 2 , more Ti−OH bonds are formed on the surface and more bulk oxygen vacancies are introduced; the disorder layer of CO-TiO 2 is relatively thin, owing to most surface vacancies being filled by Ti−OH bonds. Under simulated solar irradiation, the photocatalytic H 2 evolution rate of CO-TiO 2 reaches 7.17 mmol g −1 h −1 , which is 4.14 and 1.50 times those of TiO 2 and H-TiO 2 , respectively. The photocatalytic degradation rate constant of methyl orange on CO-TiO 2 is 2.45 and 6.39 times those on H-TiO 2 and TiO 2 . The superior photocatalytic activity of CO-TiO 2 is attributed to the effective separation and transfer of photogenerated electron–hole pairs, due to the synergistic effects of oxygen vacancies and surface Ti−OH bonds. This study reveals the relationship between the photocatalytic properties and structure, and provides a new method to prepare highly active TiO 2 for H 2 production and environmental treatment. Graphical Turn up the gas ! To obtain insights into the effect of structure on photocatalytic activity, two types of reduced TiO 2 are prepared from CO (CO-TiO 2 ) and H 2 (H-TiO 2 ). CO-TiO 2 exhibits a higher photocatalytic activity than that of H-TiO 2 due to the synergistic effects of oxygen vacancies and surface Ti−OH bonds.
研究领域:
材料科学
·
光催化
·
无机化学
·
能源材料
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环境治理
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 3
·675-682
·
IF 1.473
Wang Ting,Song S.-H.,Xu Ting,Wang Meng
Multiferroic BiFeO 3 nanopowders are synthesized through a sol–gel route using the environment-friendly and non-toxic maltose as the complexing and reducing agent. A high content of hydroxyl groups is found to be critical in the preparation of phase-pure BiFeO 3 materials. Fourier transform infrared spectroscopy, thermogravimetric analysis and differential scanning calorimetry reveal that the optimal calcination temperature of BiFeO 3 precursor is about 450 °C in the synthesis, leading to the formation of phase-pure and well-crystallized BiFeO 3 nanopowders with sizes being about 40 nm. Magnetic measurements illustrate the ferromagnetic behavior of BiFeO 3 nanopowders at room temperature. The maximum and remanent magnetizations of the nanopowders are about 0.657 and 0.048 emu/g, respectively, under the magnetic field of 50 kOe. Moreover, the energy band gap of the nanopowders is approximately 2.27 eV, confirming their strong absorbance of the visible light. Graphical
研究领域:
材料科学
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纳米科技
·
凝聚态物理
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功能材料
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无机化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Junling Duan,Li Zhao,Wei Lv,YiJing Li,Yuanhong Zhang,Shiyun Ai,Lusheng Zhu
The g-C 3 N 4 /Fe 3 O 4 nanocomposites with good fluorescence and magnetic property were designed and prepared for simultaneous detection and separation of trace Cr(VI) in water. The g-C 3 N 4 /Fe 3 O 4 nanocomposites based fluorescent sensor for Cr(VI) showed high sensitivity and selectivity. The linear response range of Cr(VI) was found to be 0 to 600 μM with a detection limit of 0.5 μM. In addition, the g-C 3 N 4 /Fe 3 O 4 as a novel adsorbent had effective removal towards Cr(VI). The adsorption capacity could reach 59.2 mg/ g. Furthermore, the g-C 3 N 4 /Fe 3 O 4 nanocomposites displayed superparamagnetic properties, allowing them to be easily separated from the liquid phase via an external magnetic field .
研究领域:
环境化学
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分析化学
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纳米材料学
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环境污染与控制
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水处理技术
✓ 已验证
DOI
高影响因子
ANALYST
·
2012
·Vol. 137
·期 15
·3502-3509
·
IF 4.23
Li-Qing Wang,Fan-Yan Lin,Li-Ping Yu
A molecularly imprinted photonic polymer (MIPP) sensor for respective detection of tetracycline, oxytetracycline and chlortetracycline is developed based on the combination of a colloidal crystal templating method and a molecular imprinting technique. Colloidal crystal templates are prepared from monodisperse polystyrene colloids. The molecularly imprinted polymer, which is embodied in the colloidal crystal templates, is synthesized with acrylic acid and acrylamide as monomers, N,N′-methylene bisacrylamide as a cross-linker and tetracyclines (TCs) as imprinting template molecules. After removal of the colloidal crystal template and the molecularly imprinted template, the resulted MIPP consists of a three-dimensional, highly ordered and interconnected macroporous array with a thin hydrogel wall, where nanocavities complementary to analytes in shape and binding sites are distributed. The response of MIPP to TCs stimulants in aqueous solution is detected through a readable Bragg diffraction red-shift, which is due to the lattice change of MIPP structures responding to their rebinding to the target TCs molecules. A linear relationship was found between the Δλ and the concentration of TCs in the range from 0.04 μM to 0.24 μM. With this sensory system, direct and selective detection of TCs has been achieved without using label techniques and expensive instruments. The developed method has been applied successfully to detect tetracycline in milk and honey samples.
研究领域:
分析化学
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食品安全
·
生物传感器
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材料科学
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药物残留检测
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分子识别
✓ 已验证
DOI
高影响因子
BMC Ophthalmology
·
2018
·Vol. 18
·期 1
·1-11
·
IF 1.77
Li Shanshan,He Jiangnan,Chen Qiuying,Zhu Jianfeng,Zou Haidong,Xu Xun
Background Our study aimed to investigate the ocular surface health of Shanghai University students. Methods This is a cross-sectional study carried out among freshmen and sophomores on the main campus of Shanghai University. Questionnaires including the widely-used ocular surface disease index (OSDI) and the Zung Self-rating Anxiety Scale (SAS) were completed first, and then ocular examinations were conducted regarding height & weight, blood pressure and heart rate, optometry, intraocular pressure exam, vision and subjective refraction, Aladdin, Macular pigment density measurement, tear test, anterior segment examination, fundus photography, ophthalmologist check, TOPCON OCT check, and Collin’s fundus blood test. Results Totally 901 students were involved in our five-day study. The prevalence of myopia was 92% (the spherical equivalent refraction (SER) < − 0.50 D), and that of high myopia was 23% (SER < − 6.0D). The prevalence of dry eye disease (DED) was 10%. The corneal epithelial loss rate (corneal fluorescein staining > 1) was 10%, and corneal sensation decline rate (≤ 30 mm) was 12%. 4.5% of subjects ( n = 40) had moderate or severe anxiety, 78% were mild and a small portion (17.5%) didn’t have anxiety at all. No statistical significant association was found between anxiety with DED, fluorescein staining or with corneal sensation (all p > 0.05). However, subjects with DED had more symptoms of anxiety. Results also showed that students who kept eye strain for a long time were more inclined to have DED (12.5%: 6.9%, p = 0.0407, 95% CI); those who watched mobile phones and/or computers for over eight hours daily were more vulnerable to DED and fluorescein staining than others (14.1%: 8.6%, p = 0.0129; 13.0%: 8.3%, p = 0.0233, 95% CI). Conclusions Keeping eye strain or near work for a long time is associated with DED, while students with DED tend to encounter anxiety symptoms. The prevalence of myopia in Chinese university students is still high. We consider it necessary to provide education to university students about the good eye-using habits, and to diagnose anxiety for student patients with DED.
研究领域:
眼科学
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公共卫生
·
流行病学
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视觉科学
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心理卫生
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屈光医学
✓ 已验证
DOI
高影响因子
Materials Express
·
2024
·Vol. 14
·期 8
·1113-1125
·
IF 0.7
Yang Guang-Hui,Yi Shao-Zhen,Du Shu-Rong,Gao Jia-Lin,Wan Xue-Juan
Combining PNIPAM with a biocompatible NIR-II photothermal agent to prepare near-infrared-responsive hydrogels holds significant importance in the field of biomedical applications. In this study, PNIPAM/Bacterial cellulose (BC)/MXene composite hydrogels were prepared by in-situ
polymerization, where Nb2C MXene serving as a near-infrared photothermal agent and BC acting as enhancing filler. The composite hydrogels possess a semi-interpenetrating network structure, where PNIPAM serves as the crosslinking network backbone, and BC act as a semi-interpenetrating
network, which significantly enhances the mechanical strength of the composite hydrogels. The tensile strength and compressive strength reach 35 KPa and 500 KPa, respectively, which is an order of magnitude higher than that of pure PNIPAM hydrogel. The introduction of BC and MXene did not
significantly affect the thermo-sensitivity of the composite hydrogel which can rapidly undergo a phase transition and release internal moisture above LCST. Morover, the composite hydrogel exhibits excellent photothermal performance, with its temperature rapidly increasing to around 70 °C
under the irradiation of 1064 nm laser. The degree of temperature fluctuations can be accurately regulated by modifying the laser intensity and exposure time. Additionally, it demonstrates good photothermal cycling stability and significant potential for photothermal therapy.
研究领域:
生物材料学
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纳米医学
·
组织工程
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光热治疗
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高分子科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Rui Li,Qiongke Shi,Luyang Zuo,Yingjun Chen,Wenqiang Li,Huitao Fan,Bo Li,Liya Wang
The shortage of fossil energy has become a growing global concern. It is particularly important to make full use of the infinite solar energy resources, and transform them into sustainable and clean energy. The development of hydrogen energy has become a feasible solution to solve the energy shortage problem. The preparation of photocatalysts featuring efficient charge transfer channels and high hydrogen production activity provides a pathway for the development of hydrogen energy. In this paper, we report for the first time the direct assembly of 2D ZnIn 2 S 4 (ZIS) nanosheets on the surface of CoTiO 3 (CTO). The synthesized CoTiO 3 /ZnIn 2 S 4 (CTO/ZIS) photocatalyst features a direct Z-scheme charge transfer channel, which enhances the separation rate of photogenerated carriers, and accelerates the photocatalytic H 2 evolution (PHE) rate. Without the assistance of any co-catalyst, the PHE rate of prepared CoTiO 3 /ZnIn 2 S 4 was as high as 5.21 mmol g −1 h −1 . Moreover, the H 2 evolution rate of CoTiO 3 /ZnIn 2 S 4 almost did not decrease significantly after four consecutive 4 h cycles. This investigation provides a valuable approach for the exploitation of novel and efficient Z-scheme photocatalysts in the application of solar energy to hydrogen energy conversion.
研究领域:
材料科学
·
物理化学
·
能源化学
·
光催化
·
纳米材料
·
可再生能源
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hui-Tao Fan,Zhou Wu,Ke-Cheng Liu,Wei-Sheng Liu
Photocatalysis based on metal sulfide semiconductor is considered as an economic, safe, renewable, and clean technology. However, the availability of photocatalysts is limited by the low solar energy utilization efficiency and the fast recombination of photogenerated electron-hole pairs. Developing a hollow heterostructure photocatalyst based on semiconductors for enhancing solar energy utilization and separation efficiency of photogenerated carriers is crucial in the photocatalytic H 2 production reaction. The as-prepared 3D hierarchical nanocages photocatalyst CuS@ZnIn 2 S 4 with abundant and compact nanosheets 2D/2D hetero-interfaces displayed an improved photocatalytic hydrogen evolution rate as high as 7910 μmol h −1 g −1 in the absence of any cocatalyst. This is the first report of the use of CuS nanosheets-assembled hollow cubic cages to construct 3D hierarchical nanocages photocatalysts. The close distance between the two nanosheet subunits induce the strong interaction, which was advantage to the separation and transfer of charge carriers. In addition, the hollow structure can not only enhance light adsorption, but also suppress photogenerated carrier recombination. The experimental characterizations and theory calculations confirmed that the strong interaction between CuS and ZnIn 2 S 4 2D/2D hetero-interfaces can extremely facilitate the separation of photogenerated charge carriers and accelerate the electrons transfer. The present work provides a feasible method to construct heterojunction photocatalyst for hydrogen evolution via water splitting powered.
研究领域:
材料科学
·
光催化
·
纳米技术
·
能源化学
·
半导体物理
·
可持续能源
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Hao Xu,Songsong Li,Lei Ge,Changcun Han,Yangqin Gao,Dongsheng Dai
Efficient separation of photo-generated electrons and holes is a crucial aspect for photocatalytic hydrogen evolution . Herein, novel plate-like Co(OH) 2 decorated TiO 2 nanosheets for photocatalytic water splitting were synthesized by a facile in-situ synthetic method. The results of X-ray diffractometry (XRD), transmission electron microscope (TEM), UV–Vis diffusion reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS) indicate the successfully incorporation of Co(OH) 2 co-catalysts onto the surface of TiO 2 nanosheet photocatalysts . Further photocatalytic hydrogen evolution experiments illustrate that all Co(OH) 2 decorated TiO 2 samples show higher rate of hydrogen production performance than pure TiO 2 sample and the composite sample with Co(OH) 2 loading amount of 0.5mol% presents the highest photocatalytic hydrogen production activity of 746.93 μmol g −1 ·h −1 . It is indicated that plate-like Co(OH) 2 particle act as an electron collector, which leads to photo-generated electrons transfer from TiO 2 to Co(OH) 2 , and therefore enhance the photocatalytic activity . Based on above results, a possible mechanism is proposed and further verified by surface photovoltage spectra (SPV).
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xulin Wang,Xiuzhen Zheng,Huijuan Han,You Fan,Sujuan Zhang,Sugang Meng,Shifu Chen
Glucose, as one of the most familiar biomass, can be utilized to produce hydrogen and fine chemicals. This work reports the renewable hydrogen production from glucose over Au/CdS-nanorods (Au/CdS-NRs) photocatalyst . For Au/CdS-NRs catalyst, it shows a superior H 2 evolution rate of 90.0 μmol g −1 h −1 under visible light irradiation. Moreover, the H 2 generation from the glucose solution on Au/CdS-NRs prepared by twice solvothermal method is much higher than Au colloid and photoreduction methods. Prepared with twice solvothermal method, Au nanoparticles are obtained from Au 3+ ions on the CdS surface, as Au 3+ can be reduced by photogenerated electrons. The separated hole can oxidize glucose to produce protons, and protons can be reduced by photogenerated electrons into H 2 . Meanwhile, the Au/CdS-NRs can also be used to produce H 2 from other biomasses, for instance sucrose, soluble starch, celluflor, pectin and waste paper scraps. The probable mechanism is proposed and discussed in the photocatalytic process from glucose reforming. This work indicates that the process of self-reducing Au 3+ to Au can drastically increase the photocatalytic efficiency of H 2 evolution from biomass, by promoting the separation and transportation of photogenerated charge carriers.
研究领域:
光催化
·
能源化学
·
纳米材料科学
·
可再生能源
·
环境催化
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Dongsheng Dai,Lu Wang,Nan Xiao,Songsong Li,Hao Xu,Shuang Liu,Boran Xu,Da Lv,Yangqing Gao,Weiyu Song,Lei Ge,Jian Liu
Efficient noble-metal-free semiconductor composite photocatalysts are highly desirable for visible light driven water splitting. In this study, Ni 2 P was successfully decorated on Zn 0.5 Cd 0.5 S as a highly efficient co-catalyst via a hydrothermal method . The chemical as well as photophysical properties of the as-obtained Ni 2 P/Zn 0.5 Cd 0.5 S samples were characterized by X-ray diffractometry (XRD), Transmission electron microscope (TEM), UV–vis diffusion reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and time-resolved fluorescence. The Ni 2 P/ Zn 0.5 Cd 0.5 S composite sample with 4% molar content of Ni 2 P showed the highest photocatalytic H 2 evolution activity with a corresponding H 2 evolution rate of 1173 μmol h −1 , which was about 13 times higher than that of pure Zn 0.5 Cd 0.5 S sample under visible light irradiation. The photocatalytic activity of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was stable even after 4 cycling photocatalytic experiments. A possible mechanism on the photocatalytic enhancement of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was systematically investigated, which can provide a novel concept for the synthesis of other desirable semiconductor materials with high photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源化学
·
半导体催化
·
清洁能源
✓ 已验证
DOI
高影响因子
TOPICS IN CATALYSIS
·
2022
·Vol. 66
·期 1
·12-21
·
IF 2.781
Zhong Cheng,Shang Zhichao,Zhao Caixian,Luo He’an,Cao Yi,Yan Dejian,You Kuiyi
In order to obtain a high photoelectrochemical performance, co-catalysts loading is the most commonly used way, which can facilitate reactions and suppress the charge recombination. In this paper, a novel composite of ZnO/Ti 3 C 2 T X photoanode was fabricated by a facile spin coating of precipitating Ti 3 C 2 T X (MXene) flakes onto the surface of ZnO, as co-catalyst for enhanced photoelectrochemical (PEC) water splitting. Under simulated sunlight, the optimum composite of ZnO/Ti 3 C 2 T X photoanode showed the photocurrent density as 1.2 mA cm −2 at 1.23 V RHE , which is 1.4 times higher than that of pristine ZnO without Ti 3 C 2 T X co-catalyst (0.83 mA cm −2 at 1.23 V RHE ). The ZnO/Ti 3 C 2 T X photoanode showed a photoconversion efficiency of 0.32% and maintained a stable photocurrent over 2000s. The Ti 3 C 2 T X (MXene) flakes as co-catalyst to promote the charge transfer and accelerates the reaction kinetics in ZnO/Ti 3 C 2 T X photoanode. This work delivers a two-dimensional (2D) material Ti 3 C 2 T X (MXene) as co-catalyst for enhanced ZnO photoanode PEC water splitting.
研究领域:
材料科学
·
物理化学
·
能源科学
·
纳米科技
·
光电催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）