JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 9
·5484-5493
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IF 3.094
Changcun Han,Tong Zhang,Qijun Cai,Chonghao Ma,Zhengfu Tong,Zhifeng Liu
In this work, cobalt phosphide (CoP) nanoparticles were successfully decorated on an ultrathin g-C 3 N 4 nanosheet photocatalysts by in situ chemical deposition. The built-in electric field formed by heterojunction interface of the CoP/g-C 3 N 4 composite semiconductor can accelerate the transmission and separation of photogenerated charge-hole pairs and effectively improve the photocatalytic performance. TEM, HRTEM, XPS, and SPV analysis showed that CoP/g-C 3 N 4 formed a stable heterogeneous interface and effectively enhanced photogenerated electron-hole separation. UV-vis DRS analysis showed that the composite had enhanced visible light absorption than pure g-C 3 N 4 and was a visible light driven photocatalyst. In this process, NaH 2 PO 2 and CoCl 2 are used as the source of P and Co, and typical preparation of CoP can be completed within 3 hours. Under visible light irradiation, the optimal H 2 evolution rate of 3.0 mol% CoP/g-C 3 N 4 is about 15.1 μmol h −1 . The photocatalytic activity and stability of the CoP/g-C 3 N 4 materials were evaluated by photocatalytic decomposition of water. The intrinsic relationship between the microstructure of the composite catalyst and the photocatalytic performance was analyzed to reveal the photocatalytic reaction mechanism.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
MOLECULES
·
2017
·Vol. 22
·期 5
·859
·
IF 2.861
Yuxue Zhou,Pengfei Lv,Xiangdong Meng,Yanping Tang,Pingping Huang,Xiaobing Chen,Xiaoshuang Shen,Xianghua Zeng
Two-dimensional thin Bi2WO6nanoplates have been fabricated using a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. We investigated the proposed formation mechanism based on the crystalline structures of the thin Bi2WO6nanoplates. The high adsorption ability and excellent visible-light driven photocatalytic activities of the Bi2WO6nanoplates were illustrated, in view of exposed (001) facets of nanoplates possessing faster separation of photo-generated charge carriers and increased catalytically active sites. Such a cost-effective way to obtain Bi2WO6nanoplates offers new possibilities for the design of adsorptive semiconductor photocatalysts with strengthened photocatalytic activities.Keywords:Bi2WO6nanoplates;semiconductor photocatalyst;visible light-driven
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Hong Liu,Zhe Zhang,Jingchai Meng,Jiang Zhang
Photocatalytic conversion of CO 2 into hydrocarbon fuels using semiconductor photocatalysts has attracted great attention, which is considered as a promising approach to resolve the energy shortage and greenhouse effect. In this work, ordered mesoporous g-C 3 N 4 (mpg-C 3 N 4 ) nanosheets supported CdIn 2 S 4 nanocomposites were successfully fabricated by a hard-template combinated with hydrothermal method. The hybrids showed highly efficient photocatalytic activities for the reduction of CO 2 to CH 3 OH under visible-light irradiation. The optimized CdIn 2 S 4 /mpg-C 3 N 4 photocatalyst exhibited a high CH 3 OH-production rate of 42.7 μmol g −1 h −1 at a mpg-C 3 N 4 content of 20 wt%. This rate was 1.8 times higher than that of pure CdIn 2 S 4 . The significant enhancement of photocatalystic activity was mainly ascribed to the increased CO 2 adsorption capacity and the improved separation and transfer of photogenerated electron-hole pairs at the intimate interface of CdIn 2 S 4 /mpg-C 3 N 4 heterojunctions. Furthermore, the hybrid photocatalysts displayed excellent stability under visible-light. A possible mechanism of enhanced photocatalytic activity of CdIn 2 S 4 /mpg-C 3 N 4 composite on photocatalytic reduction of CO 2 was also proposed. This work may provide some useful information for the future design and practical application of multifunctional hybrid photocatalysts in photocatalytic reduction of CO 2 .
研究领域:
材料科学
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环境科学
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能源科学
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DOI
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2021
·Vol. 23
·期 46
·26356-26365
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IF 3.676
Dongliang Li,Rong Chen,Xun Zhu,Dingding Ye,Yang Yang,Wei Li,Haonan Li,Yijing Yang,Qiang Liao
In this study, a contactless, flexible, and interference-free light fueled method has been developed to enhance the mixing between the ssDNA and dynabeads in a droplet, which enables rapid probe preparation for promoting the probe technology based on open surface droplet microfluidics. In this light fueled method, the use of the photothermal effect of a focused infrared laser can easily create non-uniform temperature distribution and accordingly the surface tension gradient over the interface as a result of the localized heating effect, which thereby initiates the Marangoni flow in a droplet. Experimental results confirm that the light-induced Marangoni flow greatly enhances the mixing, ensuring rapid and efficient binding between the ssDNA and dynabeads. Moreover, the mixing intensity and degree can be simply tuned by controlling the laser intensity and laser heating time. The light fueled rapid mixing method developed in the present study paves the way for rapid bio-chemical detection.
研究领域:
微流控技术
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生物化学
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光学工程
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Chuanfeng Zang,Xiangye Han,Hao Chen,Haifeng Zhang,Yonggang Lei,Hongchao Liu,Chunxia Wang,Guangyu Zhang,Mingzheng Ge
ZnO has been widely employed in the photodegradation of pollutants; however, it exhibits poor photocatalytic performance under visible light illumination. Thus, visible-light-driven heterostructured PVDF/ZnO/Ag 2 O photocatalysts were fabricated by combining the electrospinning, hydrothermal, and in situ deposition techniques. As matrix materials, it is easy to recycle and reuse electrospun PVDF nanofibers . ZnO nanorods anchored on PVDF nanofibers with a high specific surface area provide an abundance of photocatalytically active sites. As a photosensitizer , silver oxide nanoparticles enhance the visible-light photocatalytic efficiency. Thus, the composited PVDF/ZnO/Ag 2 O photocatalysts exhibit excellent photocatalytic performance under both UV and visible light irradiation as a result of the enhanced electron-hole separation/transfer and broadened visible light absorption range. Under visible light irradiation, the kinetic constant of PVDF/ZnO/Ag 2 O nanocomposites is 24.4 and 6.73 times greater than that of PVDF/Ag 2 O and PVDF/ZnO, respectively. Moreover, the PVDF/ZnO/Ag 2 O nanocomposites exhibit advantages in recycling and reusing with high stability, thus considerably widening their practical applications in the field of environmental remediation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
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2023
·Vol. 13
·期 3
·1594-1605
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IF 3.9
Baikang Zhu,Qinbing Dong,Jianghua Huang,Debin Song,Lihui Chen,Qingguo Chen,Chunyang Zhai,Bohong Wang,Jiří Jaromír Klemeš,Hengcong Tao
To improve the efficiency of photocatalytic oxidative degradation of antibiotic pollutants, it is essential to develop an efficient and stable photocatalyst. In this study, a polymer-assisted facile synthesis strategy is proposed for the polymorph-controlled α-Bi2O3/Bi2O2CO3 heterojunction retained at elevated calcination temperatures. The p–n heterojunction can effectively separate and migrate electron–hole pairs, which improves visible-light-driven photocatalytic degradation from tetracycline (TC). The BO-400@PAN-140 photocatalyst achieves the highest pollutant removal efficiency of 98.21% for photocatalytic tetracycline degradation in 1 h (λ > 420 nm), and the degradation efficiency was maintained above 95% after 5 cycles. The morphology, crystal structure, and chemical state of the composites were analysed by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Ultraviolet-visible diffuse reflection, transient photocurrent response, and electrochemical impedance spectroscopy were adopted to identify the charge transfer and separation efficiency of photogenerated electron–hole pairs. The EPR results verified h+ and ˙OH radicals as the primary active species in the photocatalytic oxidation reactions. This observation was also consistent with the results of radical trapping experiments. In addition, the key intermediate products of the photocatalytic degradation of TC over BO-400@PAN-140 were identified via high-performance liquid chromatography-mass spectrometry, which is compatible with two possible photocatalytic reaction pathways. This work provides instructive guidelines for designing heterojunction photocatalysts via a polymer-assisted semiconductor crystallographic transition pathway for TC degradation into cleaner production.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2023
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IF 1.9
Xiaohong Hu,Weiwei Jin,Haitao Zhang,Qinyu Qing,Juan Pang
Visible-light-driven azobenzene had been reported by theoretical calculation, but could not be detected by any characterization method due to unstable cis structure. Herein, copolymerization was applied to solve the problem based on a time-dependent characteristic of macromolecular motion. Therefore, two copolymers, namely, MRAA-PEG20 copolymer and MRAA-NIPAM copolymer, were synthesized with a definite segment ratio. Both copolymers had photosensitive groups, which were confirmed by UV-vis spectra. Furthermore, copolymer concentration had a linear relationship with absorbance value at 425 nm. Firstly, blue light as an excitation source to induce the isomerization of copolymers. At the same time, repeated interval irradiation was used to evaluate the fatigue performance of the copolymer. Consequently, both copolymers could quickly transform to their cis isomers upon irradiation, which could be reversible recovered to their trans isomers in operable recovery time after removing irradiation. However, the MRAA-PEG20 copolymer had an obvious photobleaching phenomenon along with the circle index, which did not exist in the MRAA-NIPAM copolymer. Secondly, the effects of excitation light source on isomerization were investigated. It was found that blue light was the most efficient excitation source for both copolymers though other light could also induce trans-to-cis transition. Thirdly, the influence of light intensity and temperature was respectively studied. With increasing of light intensity, the absorbance ratio before and after irradiation monotonously decreased, the irradiation response time shortened and the recovery response time prolonged. Moreover, higher temperature resulted in a higher absorbance ratio, shorter irradiation response time, and shorter recovery response time. Finally, synthesized copolymers had characteristic of pH indicator with a critical point of pH 5.0.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
LANGMUIR
·
2023
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IF 3.9
Wenjing Zhu,Zhinan Xia,Bingfeng Shi,Changli Lü
A series of 2D M(Cu, Zn, Co, and Mn)-TCPP MOFs/TiO2 binary nanocomposites (TCPP = tetrakis(4-carboxyphenyl)porphyrin) were constructed by solvothermal in situ loading of flaky TiO2 on the surface of 2D metal–organic frameworks (MOFs). The influence of different coordination metals on the catalytic activity was studied, and it was found that the 2D Cu-TCPP MOFs/TiO2 nanocomposite exhibited the best photo-Fenton performance. The superior property can be attributed to the high absorption coefficient and ultrathin two-dimensional structure of the 2D Cu-TCPP MOFs nanosheets. Meanwhile, the 2D Cu-TCPP MOFs/TiO2 II heterostructure can effectively promote the separation and transfer of photoformed carriers. Moreover, under visible irradiation, the optimized 2D Cu-TCPP MOFs/TiO2 composite can convert 99.9% of Cr(VI) to Cr(III) within 60 min with methanol as the hole scavenger at pH 3.14. Also, the photocatalytic performance of 2D Cu-TCPP MOFs/TiO2 was maintained after five reaction cycles. Furthermore, the proposed visible-light-driven photocatalysis mechanism of the 2D Cu-MOFs/TiO2 composite was reasonably derived according to experimental results. This study demonstrates the potential of building efficient TiO2-based visible light photocatalysts with 2D metal-porphyrin MOFs.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Yang Liu,Zhuofeng Hu,Jimmy C. Yu
Doping heterogeneous atoms into BiOX is recognized as an effective method to improve its photocatalytic activity. Here, S-doped BiOBr (S–BiOBr) was synthesized via a solvothermal method in the absence of water, which is supposed to substitute O as S 2− in the lattice. This material is firstly used for the visible-light-driven degradation of ibuprofen, a model anti-inflammatory drug. The degradation efficiency of S–BiOBr is much higher than that of pure BiOBr. The degradation kinetic constant for S–BiOBr (2.48 × 10 −2 min −1 ) is about 3 times as high as that of pure BiOBr (0.83 × 10 −2 min −1 ). It is found that S-doping tunes the band structure of BiOBr, leading to a narrower band gap and thus higher utilization efficiency of visible light. The degradation of ibuprofen on S–BiOBr can be attributed to the generation of H 2 O 2 and OH radicals. OH radical plays a synergistic role along with holes in the photocatalytic degradation process, which is supposed to be better than the reported single hole- or superoxide-dominant reaction. This work reveals a previously unrecognized and more efficient method for the degradation of organic contaminants on BiOBr.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yu Huang,Xinyang Xu,Guangjian Fan,Xiaoxuan Zhu,Lin Zhu,Xi Chen
The effect of TiO 2 crystal phase on the photocatalytic properties of TiO 2 /g-C 3 N 4 heterojunction photocatalyst under sunlight irradiation was investigated through experiments and theoretical calculations. Results reveal that for TiO 2 /g-C 3 N 4 heterojunction photocatalyst, anatase phase TiO 2 can adjust the band edge positions to ensure the generation of strongly oxidizing radical species (·O 2- and ·OH), and rutile phase TiO 2 can effectively reduce the band gap to more efficiently utilize sunlight. Consequently, the combination of g-C 3 N 4 with P25 TiO 2 composed of both anatase and rutile phases is the most favorable combination for sunlight-driven photocatalyst among the obtained three TiO 2 /g-C 3 N 4 heterojunction photocatalyst. P25 TiO 2 and g-C 3 N 4 form a type-II/type-II heterostructure with stepped heterojunction and concave heterojunction. The P/CN photocatalyst exhibits excellent photocatalytic activity with degradation efficiencies for naphthalene reaching 100% within 120 min of sunlight irradiation, as well as considerable stability. The combination of P25 TiO 2 and g-C 3 N 4 has shown significant potentials in improving the separation and transfer efficiency of photogenerated electron-hole pairs, as well as enhancing the utilization of sunlight in photocatalytic process. This work provides a promising strategy for the preparation of highly active TiO 2 /g-C 3 N 4 heterojunction photocatalyst for the effective treatment of naphthalene from water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Materials Chemistry C
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2024
·
IF 5.7
Dan Wang,Zhen Hou,Fengling Wang,Hui Zhang,Jiwei Jiang,Bin Dong
Light-driven rotary actuators have undergone tremendous progress in recent years and show great potential for different applications ranging from sensors, soft robots to micro–nano intelligent systems. However, most photoactuators with rotary motions have a low rotational speed due to their low responsive speed and small driving force, which hinder both their fundamental and practical research. In this paper, we report a fast rotation of a soft actuator in response to light, which harnesses the synergistic interactions between two binary responsive components, i.e. water responsive agar and photothermally responsive polypyrrole, leading to a structural protrusion at the irradiation center that provides a jet-propulsion when the gas expands to the edge of the film. Interestingly, the motion behavior of the photoactuator film could be well controlled from the in-place rotation to horizontal motion as a result of the fast rotation with a speed as high as 5200 rpm. The current study indicates a fast rotation could be realized by the simple design and fabrication, which may not only stimulate the exploration of new motion behaviors for photothermal actuators but also open up new opportunities for their practical applications.
研究领域:
材料科学
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智能系统
·
纳米技术
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DOI
高影响因子
Environmental Progress & Sustainable Energy
·
2020
·Vol. 40
·期 1
·e13479
·
IF 1.989
Zhengjiang Liu,Anqi Wang,Qiancheng Zhang,Juming Liu,Huiyan Ma,Di Li,Lei Xing
Sensitized kaolinite with improved visible-light catalytic activity was prepared via a facile in-situ growth of nanosized Cu-TiO 2 on the surface of the sulfated kaolinite impregnated in Cu-TiO 2 sol. The as-prepared photocatalysts were characterized in terms of various techniques. The transmission electron microscope and energy dispersive spectrometer results revealed that Cu-TiO 2 could grow on the surface of the pretreated kaolinite and the aggregation of Cu-TiO 2 was successfully inhibited. The X-ray photoelectron spectrum confirmed the formation of Al O Ti bonds between Cu-TiO 2 and sulfated kaolinite in the sensitized kaolinite composite. The sensitized kaolinite composite exhibited significantly improved performance in the degradation of Rhodamine B (RhB), leading to about 87% of RhB degradation in 180 min, which is superior to that of the kaolinite, calcined kaolin, and sulfated calcined kaolin under visible-light irradiation. The superior photodegradation activity of the sensitized kaolinite composite was primarily attributed to the synergetic effect of Cu-TiO 2 sensitization and sulfation, resulting from the efficient transfer and separation of the photo-induced charge carriers between Cu-TiO 2 and kaolinite.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）