SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiaohong Ma,Jiajia Zheng,Huacheng Jin,Xi Zeng,Danyang Li,Feifei You,Jian Qi,Fangli Yuan
The utilization of solar energy to convert CO 2 into small energy molecules is a potential “carbon neutral” technology for CO 2 emission reduction. However, the industrial application is significantly constrained due to the low reduction efficiency, complexity of the synthesis methods, and limitations in scaling up the catalyst materials. In this work, we have successfully designed and synthesized a series of hollow tubular ZnO@ZnS core-sheath heterostructured materials, by combining radio-frequency thermal plasma and hydrothermal treatment technologies. The S:Zn molar ratio, reaction time, and temperature were systematically investigated, and the morphology of intermediate products was successfully captured, which provided conclusive evidence for the proposed formation mechanism. Notably, the photocatalytic CO yield of the ZS 0.5 O hollow nanotube core-sheath composite is not only 3.20 or 4.03 times higher than that of the pure ZnO or ZnS, respectively, but also possesses excellent stability. By in-depth characterization, we found that the hollow core-sheath heterostructure enhances light capture and absorption, exposes more effective active sites, and builds a type-II heterojunction between ZnO and ZnS to enhance the separation efficiency of charge carriers. The synergy of these factors significantly improves the catalytic performance, offering new insights for photocatalytic, electrocatalytic, and photoelectrocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Molecular BioSystems
·
2011
·Vol. 7
·期 8
·2452-2458
·
IF 3.825
Jianbo Xiao,Feijiu Wang,Jie Liu,Litong Wang,Guoyin Kai,Xibin Yu
Zero-dimensional nanostructures such as ZnO#ZnS QDs heterojunctures (QDHJs) are green nanoparticles and have gained a tremendous amount of attention. However, very little information is available on the effects of these heterojunctures on the transportation of drugs in blood. Herein, stilbenes were studied for their affinities for common bovine plasma proteins (CBPP) in the presence and absence of QDHJs with different diameters. The affinities of QDHJs for CBPP improved with increasing QDHJs size. QDHJs improved the affinities of resveratrol and polydatin for CBPP by 14.74% to 22.36% and 12.56% to 21.34% depending on the size of QDHJs. The number of binding sites (n) between resveratrol and polydatin for CBPP in the presence of QDHJs were 1.04 ± 0.03 and 1.06 ± 0.04, which were obviously higher than those in the absence of QDHJs (n = 0.89 and 0.92). QDHJs in blood will decrease the free concentration of stilbenes and weaken their pharmacological effects.
研究领域:
药理学
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纳米生物学
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
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2015
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IF 2.489
Guangxia Cao,Hanjia Yang,Kunquan Hong,Wenjia Hu,Mingxiang Xu
Aligned zinc oxide/zinc sulfide core–shell nanowire arrays are synthesized on transparent conductive oxide (TCO) glass substrate by sulfurizing ZnO nanowires using a vapor phase method. The length of these nanowires is about 7.3 μm with diameter of ~100 nm. The thickness of the ZnS shell can be controlled by adjusting the reaction time. It is found that the shell layer is well crystallized with preferring growth direction of ZnS [002]. The result indicates that when used to decompose methyl orange (MO), the core–shell nanowire arrays have superior photocatalytic performance under UV-light irradiation, which shows considerable potential applications of this nanocomposite in water purification.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 7
·2201093
·
IF 7.9
Xiaohong Ma,Danyang Li,Jun Xie,Jian Qi,Huacheng Jin,Liuyang Bai,Hao Zhang,Feifei You,Fangli Yuan
The reduction of CO 2 to chemical fuel driven by solar energy can not only meet the growing demand for renewable energy, but also balance the carbon cycle in nature. However, the current photocatalysts have low CO 2 conversion due to their poor light capture ability, narrow light response range, and high recombination probability of photogenerated carriers. Herein, a heterogeneous photocatalyst of hollow structured ZnO/ZnS decorated with Pt nanoparticles is synthesized through the hydrothermal process and photodeposition method, showing excellent photocatalytic activity for CO 2 reduction in long-time stability and ≈100% CO selectivity, which can mainly contribute to natural enhanced light-capture ability of the hollow confined space due to multiple reflection and scattering of light in the cavity, thus improving separation efficiency of photogenerated charge carriers due to the type II junction constructed between ZnO and ZnS and the additional reaction active sites after decorating Pt nanoparticles in the surface of the hollow structure.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Mei Cai,Chao He,Hulei Yu,Anze Shui
The construction of heterojunction for photocatalysis has garnered much research interest. Herein, we report the successful fabrication of a ternary dual S-scheme ZnO/ZnS/In 2 S 3 heterojunction with a higher photocatalytic capacity via a hydrothermal method . Specifically, the optimized ternary heterojunction ZSI0.35 sample achieves the 100 % photodegradation efficiency of RhB (10 mg/L, 50 mL) within 10 min, approximately 17 and 8 times higher than pure ZnO and ZnO/ZnS binary heterojunction, respectively. Further characterization results confirm the dual S-scheme heterojunction structure in the fabricated ZnO/ZnS/In 2 S 3 ternary heterojunction, and the improvement of photocatalytic properties can be attributed to the enhanced Brunauer Emmett-Teller (BET) surface area, the improved redox capacity of the photocatalyst, and the quick charge transfer. Additionally, the possible photocatalytic mechanism is discussed according to the measurements. This work provides an efficient strategy of promising heterojunction photocatalysts for photocatalytic environmental remediation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2015
·Vol. 21
·期 36
·12728-12734
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IF 5.731
Di Bao,Peng Gao,Xinyang Zhu,Shuchao Sun,Ying Wang,Xiaobo Li,Yujin Chen,Han Zhou,Yanbo Wang,Piaoping Yang
Graphical A place in the sun : One dimensional ZnO/ZnS heterostructured nanorod arrays exhibit good performance in photocatalytic hydrogen evolution, and their energy conversion efficiency reaches 13.9 % at room temperature. Semiconducting heterostructures have been widely applied in photocatalytic hydrogen evolution due to their variable band gaps and high energy conversion efficiency. As typical semiconducting heterostructures, ZnO/ZnS heterostructured nanorod arrays (HNRAs) have been obtained through a simple anion-exchange process in this work. Structural characterization indicates that the heterostructured nanorods (HNRs) are all composed of hexagonal wurtzite ZnO core and cubic zinc-blende ZnS shell. As expected, the as-obtained one-dimensional heterostructures not only lower the energy barrier but also enhance the separation ability of photogenerated carriers in photocatalytic hydrogen evolution. Through comparisons, it is found that 1D ZnO/ZnS HNRAs exhibit much better performance in photocatalytic hydrogen evolution than 1D ZnO nanorod arrays (NRAs) and 1D ZnS NRAs. The maximum H 2 production is 19.2 mmol h −1 for 0.05 g catalyst under solar-simulated light irradiation at 25 °C and the corresponding quantum efficiency is 13.9 %, which goes beyond the economical threshold of photocatalytic hydrogen evolution technology.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Qiming Luo,Huiliang Cao,Lanyu Wang,Xiaohan Ma,Xuanyong Liu
Cell-selective toxic titanium is highly desired in clinical dental practice. Herein, based on the in situ conversion of ZnO to ZnO@ZnS, nanorod-array structured coatings with a controllable release features of zinc (Zn), has been successfully fabricated by a two-step hydrothermal method to endow titanium surface with cell-selectivity, i.e. boosting the functions (attachment and migration) of human gingival fibroblasts (HGnFs) while acting against the invasion of pathogenic bacteria. The improved functions of HGnFs over the ZnO@ZnS nanorod-array were attributed to the material’s optimized zinc release, which was decreased from an order of 3.5 mg L −1 to about 0.3 mg L −1 (within the first week). But more importantly, this concentration still had a high antibacterial efficacy up to 100% (against both the S. aureus and E. coli , 10 7 CFU mL −1 ). This study demonstrated that a ZnO@ZnS nanorod-array coating could be a promising strategy to endow titanium dental implants with improved soft tissue sealing and effectively reduce peri-implantitis.
研究领域:
生物材料学
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口腔医学
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细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Fen Qiao,Wenjie Liu,Jing Yang,Jiaren Yuan,Kaiyue Sun,Peng Fei Liu
High recombination probability of photo-generated carriers restricts the characteristics improvement of semiconductor photocatalysts . The construction of heterojunction structure has become a common strategy to enhance the transport properties of carriers in catalysts. In this paper, the chain-like structure of ZnO/ZnS heterojunction was prepared by the combination of electrospinning and ion exchange. The composition and structure of ZnO/ZnS composites were studied by SEM, HRTEM , XRD , etc., and the influence of vulcanization degree on the hydrogen production of ZnO/ZnS was studied. Compared with bare ZnO, the chain-like ZnO/ZnS heterojunction shows better photocatalytic hydrogen production performance. When the Na 2 S concentration was 0.064 M, the hydrogen production of ZnO/ZnS exhibits the best performance (1140.64 μmol. g −1 ). Proper vulcanization treatment to construct ZnO/ZnS heterojunction structure is the key factor to boost the hydrogen generation performance. The signification enhancement of photocurrent response was observed in ZnO/ZnS composites, which also confirmed the effective charge transfer between ZnO and ZnS. In addition, the charge transfer mechanism and photocatalytic hydrogen production at the ZnO/ZnS interface was discussed by the density functional theory (DFT) calculation. It was also confirmed that the electrons distribution near the interface of ZnO/ZnS heterojunction accelerates the carrier transport of carriers, so that larger electrons and holes are involved in oxidation and reduction, thus enhancing the photocatalytic hydrogen production activity of catalysts. This work provides practical reference value for the design of new composite photocatalyst and the study of catalytic mechanism.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2018
·Vol. 52
·期 3
·035501
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IF 2.373
Weiwei Xia,Lingzhi Guan,Xianghua Zeng,Jinpeng Yang,Hui He,Yunqing Cao
Vertically aligned quasi two-dimensional (2D) ZnO nanorods (NRs) on carbon fiber paper were prepared by a modified hydrothermal approach, an individual ZnO nanorod has a diameter of 100–200 nm and a length of ~1 µm. ZnO/ZnS core-hell hierarchal structures with an outer ZnS shell of ~25 nm were fabricated under an elaborate sulfidation treatment. Compared to ZnO NRs a depressed near band emission at 380 nm and a significant enhanced visible light emission around 500 nm were observed for the ZnO/ZnS core-hell NRs from photoluminescence spectra. XPS and ESR measurements were carried out to study the ions constituents and the defects of the prepared samples. The prepared samples were used as photoelectrodes in visible-light self-powered photoelectrochemical cell-type detector. And an enhanced photocurrent of 6.79 µA was obtained, which is ten times as high as that of the bare ZnO electrode. The results show that the existence of sulfur vacancies and the formation of ZnO/ZnS heterostructure were able to promote photocurrent performance, the former increases the carrier concentration and leads to an upshift of work function; the latter makes the band bend and the photogenerated e–p pairs can be separated efficiently. The results will be helpful to implement visible-light device based on heterostructure via interfacial engineering.
研究领域:
材料科学
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光电子学
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产品关联
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Zhen Zhao,Lei Zhang,Yinghua Zhuang,Yang Guo,Hongming Zhang,Wanli Jiao
To achieve rapid detection of hydrogen sulfide (H 2 S) gas at lower temperatures, We present a high-performance PdO/ZnO/ZnS-based H 2 S gas sensor, which was synthesized using a hydrothermal synthesis method in conjunction with an in situ sulfuration process and surface modification by PdO. Vacuum sintering to prevent high temperature oxidation of ZnS. The introduction of PdO not only makes the sheet ZnO/ZnS turn to spherical-like, but also increased the content of adsorbed oxygen. Compared with ZnO/ZnS sample, the PdO/ZnO/ZnS based sensor exhibited a higher response value of 212.4 to 10 ppm H 2 S at lower temperature of 100 °C, with response and recovery times of 2.9 and 1.7 min, respectively. In addition, excellent performance is demonstrated in terms of gas selectivity , repeatability and long-term stability during testing.
研究领域:
材料科学
·
化学传感器
·
环境监测
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Bo Ji,Jixiang Zhang,Cheng Zhang,Nian Li,Tingting Zhao,Fa Chen,Lihe Hu,Shudong Zhang,Zhenyang Wang
The photocatalytic degradation for environmentally hazardous substances has been widely explored with the use of various photocatalysts and techniques. It still remains a challenge to achieve efficient degradation and removal of residual antibiotics in the water environment. Here, we report an improved photocatalytic activity chip for degradation of antibiotic tetracycline hydrochloride by perpendicular ZnS-coated ZnO nanorod arrays (ZnO@ZnS NAs). The enhanced photocatalytic activity contributed to the polycrystalline ZnS shell’s effective inhibition of the recombination of photogenerated electron–hole pairs. Meanwhile, vertically aligned ZnO@ZnS nanorod arrays can increase the light harvesting ability by enhancing scattering of light among ZnO@ZnS NAs. On the basis of these findings, an improved photocatalytic activity ZnO@ZnS NA chip has been fabricated by growth of ZnO NAs on a piece of silicon wafer and further sulfurization. More importantly, ZnO@ZnS NA chips have been utilized to construct a ladderlike device, purifying antibiotics wastewater in one step, to effectively degrade tetracycline hydrochloride with enhanced photocatalytic efficiency in flowing contaminated water. In addition, the ZnO@ZnS NA device exhibited excellent recyclability in multiple repeated cycles. The ZnO@ZnS NA chip provided a convenient and fast strategy for removal of antibiotics and pharmaceutical residues in wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 50
·505704
·
IF 3.5
Yuhang Chen,Qi Xue,Weiguo Luo,Yu Sun,Ming Li,Tao Hang
Zinc oxide quantum dots (ZnO QDs) have gained wide attention due to their wide excitation spectrum, large Stokes shift, adjustable photoluminescence (PL) spectrum, and excellent biocompatibility. However, low fluorescence intensity and poor stability restrict their further applications. In this work, zinc sulfide (ZnS) as a surface modifier, ZnO/ZnS core–shell QDs with type-I core–shell structure and particle size of 5 nm were prepared via sol–gel method. Transmission electron microscope characterization demonstrates the core–shell structure and spherical morphology of the as-synthesized ZnO/ZnS QDs. The PL spectra show that ultraviolet fluorescence has been greatly enhanced. The maximum fluorescence intensity of ZnO/ZnS core–shell QDs increases by 5288.6% compared with that of bare ZnO QDs. The PL quantum yield increases from 9.53% to 30.95%. After being stored for three weeks, the fluorescence performance can be well retained. Furthermore, the cytotoxicity tests confirm the excellent biocompatibility of ZnO/ZnS core–shell QDs, demonstrating they are good candidates for cell imaging.
研究领域:
材料科学
·
生物医学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）