CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 6
·1032-1038
·
IF 1.063
Zhu Yuxin,Jiang Xing,Lin Lin,Wang Shuhua,Chen Chao
A new ZnS/CdS heterojunction is constructed through the direct sulfurization of a metal ions exchanged Zn/Cd-MOF precursor(MOF=metal-organic framework material). The composition, structure, morphology, photoabsorption and photoelectric performance of the ZnS/CdS are characterized by powder X-ray diffraction(PXRD), scanning electron microscope(SEM), transmission electron microscope(TEM), diffuse reflection spectrum(DRS), photoelectric current(PEC), electrochemical impedance spectroscopy(EIS) and photoluminescence(PL) technologies. Since the metal ions are highly orderly separated by the organic ligands and the inherent porosity of the Zn/Cd-MOF, the as-synthesized ZnS/CdS possesses a large surface area and intimate contact at the heterogeneous interface with uniform ZnS/CdS nanoparticles. The photocatalytic hydrogen evolution activity of the ZnS/CdS is investigated under visible light irradiation(λ⩾420 nm). It exhibits enhanced photocatalytic performance that the optimal ZnS/CdS achieves a maximum average hydrogen production rate of 2348 µmol·h −1 ·g −1 . A possible electron transfer mechanism is therefore proposed by the analyses of the Mott-Schottky plots.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 23
·4229-4236
·
IF 3.545
Sheng Wang,Yan Wang,Yu Zhuang,Wei Lian,Hengdong Ren,Yin Liu,Tianshu Zhang,Ling Bing Kong
In this paper, palygorskite (Pal) and spherical zinc sulfide (ZnS) nanopowders were successfully synthesized by using a simple hydrothermal method. The ZnS nanoparticles were supported on the framework of Pal without agglomeration, thereby increasing the specific surface area of Pal/ZnS nanocomposites (from 36.33 m2 g−1 to 83.85 m2 g−1). The acquired nanocomposites exhibited a significant enhancement in photoactivity for the degradation of rhodamine B under simulated sunlight irradiation. Specifically, when the content of Pal was 40%, the nanocomposite showed optimal photocatalytic activity, with a degradation rate of rhodamine B of 100% in 150 min. The improved photocatalytic performance of the nanocomposites may be attributed to the fact that the incorporation of Pal not only strengthened the adsorption of rhodamine B, but also reduced the band gap energy of the nanocomposites and the recombination rate of electrons and holes. Such inexpensive high-performance Pal/ZnS nanocomposites could find potential applications for the degradation of organic dyes.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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
·
口腔医学
·
细胞生物学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
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
·
催化化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shuaitao Qin,Zhongjie Cui,Zhuoqi Wen,Dan Yang,Haiyang He,Jinchan Zhao,Mingliang Zhang,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
Colloidal indium phosphide (InP) quantum dots (QDs) have attracted worldwide attention due to their intrinsic environmental friendliness and excellent optical properties. The incorporation of metal ions has been a common way to modify the properties of InP QDs and some metal ions have been confirmed to be effective in preparation of blue-emitting InP QDs. Herein, the interfacial anchoring effect of rare earth metal ions neodymium(III) (Nd 3+ ) is unveiled for the first time by analyzing the alteration of spectra, size, and composition of QDs after Nd doping. It is evidenced that Nd substitutes for In of InP during the process of nucleation. More crucially, Nd is anchored at the surface of InP and inhibits their further growth at the high temperature of shelling. This ensures that the size of InP QDs and the absorption peak position are almost maintained during shell growth. It is demonstrated that the emitting wavelength of InP/ZnS core/shell QDs is systematically tunable through varying Nd amounts. Finally, the optimized InP/ZnS QDs exhibiting an emission peak of 470 nm with a photoluminescence quantum yield of 44%, and a full width at half-maximum of 46 nm are prepared.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 30
·期 2
·351-359
·
IF 2.137
Jinying Du,Yu Tian,Ning Li,Jun Zhang,Wei Zuo
In order to improve the antifouling performance of PVDF membrane, a novel zinc sulfide/graphene oxide/polyvinylidene fluoride (ZnS/GO/PVDF) composite membrane was prepared by immersed phase inversion method. The surface morphology, crystal structure, photocatalytic activity, and antifouling property of the as-prepared membranes were systematically studied. Results showed that the ZnS/GO/PVDF hybrid membranes were successfully fabricated with uniform surface. The hybrid membrane surface possessed higher hydrophilicity with water contact angle decreasing from 77.1° to 62.2°. The permeability of the hybrid membrane was therefore enhanced from 222.9 to 326.1 L/(m 2 hour). Moreover, bovine serum albumin (BSA) retention experiment showed that the hybrid membrane separation was also promoted by 7.2%. The blending of ZnS and GO enhanced the hydrophilic and photocatalytic performances of PVDF membrane, which mitigated the membrane fouling effectively. This novel hybrid membrane could accelerate the practical application of photocatalytic technology in membrane separation process.
研究领域:
材料科学
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环境工程
·
膜技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Danlu Su,Le Wang,Min Li,Shiliang Mei,Xian Wei,Hanqing Dai,Zhe Hu,Fengxian Xie,Ruiqian Guo
Ternary Ⅰ-Ⅲ-Ⅵ quantum dots (QDs) have become promising color-conversion materials for warm white light-emitting diodes (WLEDs) because of their broad emission, large stokes shift, high luminescence and low-toxicity. In this work, AgInS 2 /ZnS (AIS/ZnS) core/shell QDs were synthesized via a facile microwave-assisted aqueous method. The PL emission can be tuned from 540 to 622 nm by varying the Ag/In ratio and the maximum quantum yield can reach 58.27%. Flexible luminescent films were obtained by embedding AIS/ZnS QDs in polyacrylamide hydrogel, which were combined with blue InGaN chips to fabricate remote-type warm WLEDs. The as-prepared LEDs exhibit a relatively high color rendering index (CRI) of 87.5 and a correlated color temperature (CCT) of 3669 K, indicating that water-soluble AIS/ZnS QDs are competitive color-conversion materials for warm WLEDs.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2018
·Vol. 52
·期 3
·035501
·
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
·
光电子学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Pan Li,Gan Luo,Shuang Zhu,Lingju Guo,Peng Qu,Tao He
Catalytic reduction of CO 2 is usually accompanied by competitive H 2 evolution. However, the selectivity between CO 2 reduction and H 2 evolution is not completely understood hitherto. Here ZnS is chosen as the model catalyst to study this and are prepared by hydrothermal treatment of ZnS(en) 0.5 precursor. ZnS nanoparticles exhibit high production yield of solar fuels due to the formation of internal Sphalerite-Wurtzite phase junction within a single particle. The predominant product of H 2 can reach a yield as high as 31.5 mmol/g-cat after 4-h reaction, meanwhile with a high CO yield of 279.3 μmol/g-cat. The mechanism is proposed from both dynamic (adsorption/desorption of reactants/products) and thermodynamic (redox potential, change in Gibbs free energy of key intermediates) point of view. This work not only provides useful information on the reaction selectivity between CO 2 reduction and H 2 evolution, but also pave a way to adjust the yield of a specific product upon photocatalysis.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wujian Zhang,Zhiling Huang,Lianyang Zhang,Yue Meng,Zheming Ni,Haodong Tang,Shengjie Xia
Defect (vacancy) engineering can modulate the catalyst surface atoms and electrons, which is a low-cost and effective modification strategy for Z-scheme heterojunction . In this paper, metal and non-metal double vacancies (V Zn+O ) Z-scheme heterojunction photocatalysts (BiOCl/ZnS−V Zn+O ) were synthesized for the degradation of norfloxacin (NOR) for the first time. The results show that the built-in electric field of BiOCl/ZnS−V Zn+O catalyst induces the directional migration of photogenerated carriers, which greatly improves the carrier migration and separation efficiency. The introduced nonmetallic (O) vacancies can lower the conduction band of BiOCl, while the metallic (Zn) vacancies can enhance the valence band of ZnS. Due to the synergistic efficiency formed by the double vacancies and Z-scheme heterojunction, BiOCl/ZnS−V Zn+O showed excellent performance in photodegradation of NOR (97.9% degradation rate of 20 mg/L NOR in 50 min photodegradation). In addition, the mechanism of action, intermediates and degradation pathways of photodegradation were discussed in detail.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Dandan Liu,Haiou Liang,Tong Xu,Jie Bai,Chunping Li
Through a simple fiber template method, we combined the n-type TiO 2 catalysts with n-type ZnS@ZnO heterojunction to synthesize a high-efficiency ternary hollow TiO 2 -ZnS@ZnO n-n heterojunction. Under these modified conditions, the composite catalysts could broaden the visible light absorption range of the pure TiO 2 , and both the hollow structure and heterojunction could inhibit the recombination ability of the photon-generated carriers. Optical and Electrochemical characterizations indicated that the photogenerated electrons and holes can be separated efficiently and the composites have visible light absorption. The experimental results show that, the removal efficiency of the optimal composites for photocatalytic degradation of Tetracycline Hydrochloride (TC) under visible light ( λ ≥ 420 nm) was 86.67% due to the ·O 2 − free radicals of efficient production, it exhibited 5 times higher degradation rate towards Tetracycline Hydrochloride (TC) than pure TiO 2 . The composites with high photocatalytic activity could also effectively degrade Methylthionine Chloride (MB), Xylenol Orange (XO), Acid Red 18 and Rhodamine B (RhB) under the driving of visible light. This work provided a simple method to construct ternary heterojunction, and also provided a promising strategy to solve the environmental pollution problem in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Meng Li,Weiji Sun,Wangkai Hui,Lang Liu
Photocatalytic oxidation technology is a green and low carbon approach for degradation of mineral processing wastewater, which is extensively applied to ecological environment restoration. In this research, coal gangue-ZnS/CuS pyroelectric/photothermal composite photocatalyst is constructed by high temperature calcination method. The temperature difference between heat converted from light energy absorbed by CuS and the circulating condensate water provides the impelling force for the pyroelectric effect. The porous structure of coal gangue acts as a “heat capacitor”, which furnishes greater temperature fluctuation for pyroelectric effect. Furthermore, the hydroxyl groups on the surface of coal gangue can availably adsorb oxygen and facilely form superoxide radicals with electrons. The degradation efficiency of xanthate is as high as 99.5 % within 50 min. This research has significant implications for designing and developing highly efficient photocatalysts for the degradation of mining wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）