POWDER TECHNOLOGY
·
2019
·
IF 3.413
Zhenkui Li,Na Wei,Man Zheng,Anping Yao,Ruiqi Xu,Xiaojie Song,Huanhuan Wang,Qiao Liu,Hongzhi Cui
Solar steam generation is a prospectively technology that could be used to alleviate the problem of water shortage. Here, we design a 1D/2D W 18 O 49 /rGO heterostructure and construct a bilayer structure of light absorber, which contains W 18 O 49 nanofibers and rGO nanosheets composite layer for sunlight harvesting and a pre-treated wood layer for water supply and thermal insulation . With an optimized composition of the 1D/2D W 18 O 49 /rGO heterostructure, the constructed interfacial evaporation system demonstrate a quick thermal response and achieve a steady-state evaporation efficiency of 86.5% with the evaporation rate of 1.34 kg∙m −2 ∙h −1 under one sun illumination, and it exhibits excellent cycle stabilities after 25 cycles. Moreover, the salinity of the sea water is greatly reduced, much less than the World Health Organization (WHO) standards of the drinking water . This novel and facile bilayer structure demonstrates substantial promise for application in the fields of solar evaporation to deal with the problem of water shortage.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yi Xiao,Xueqin Tao,Ganhua Qiu,Zhifeng Dai,Peng Gao,Benxia Li
Constructing Z-scheme photocatalysts is an effective approach to enhance the conversion efficiency of solar to chemical energy. Herein, W 18 O 49 /g-C 3 N 4 heterostructures have been synthesized by growing W 18 O 49 ultrathin nanowires on g-C 3 N 4 nanosheets via a convenient solvothermal process. Various characterizations were performed on the materials to understand the structure-performance relationship. The photocatalytic properties of the W 18 O 49 /g-C 3 N 4 heterostructures were evaluated by the two oxidation reactions, phenol degradation and oxidative N C coupling of benzylamines , under a simulated sunlight (360 ≤ λ ≤ 780 nm). With tuning the W 18 O 49 /g-C 3 N 4 mass ratio, the optimal photocatalyst of W 18 O 49 (30)/g-C 3 N 4 containing 30 wt% W 18 O 49 nanowires exhibited the highest activity in both the photocatalytic reactions. The generations and contributions of the active species in the photocatalytic reactions were identified by electron spin resonance (ESR) spectra and active-species-eliminating experiments. Accordingly, the photocatalytic mechanism of W 18 O 49 /g-C 3 N 4 heterostructures has been expounded based on the direct Z-scheme electron transfer between the two semiconductors as well as the synergistic actions of active sites on W 18 O 49 nanowires and g-C 3 N 4 nanosheets . This work demonstrates a rational paradigm to construct 1D/2D semiconductor heterostructures and provides further insights into Z-scheme photocatalytic mechanism for boosting solar-driven pollutant degradation and organic transformation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiayu Li,Jun Xiong,Haoxue Huang,Mei Zhang,Wenshuai Zhu,Jun Di
The non-stoichiometric structure of tungsten oxide (W 18 O 49 ) makes it easy to form oxygen vacancies near the low-valence W atoms, so the W 18 O 49 can be applied to oxidative desulfurization. To further improve the desulfurization activity of W 18 O 49 to meet the increasingly stringent environmental requirements, Mo doping and plasma-induced surface reconstruction cooperative strategies are developed. The incorporation of Mo species into the W 18 O 49 surface by replacing W sites can adjust the atomic and electronic structure of the catalyst surface and form more oxygen vacancies. After Mo doping into the W 18 O 49 , the plasma bombarded the surface of material to destroy part of the surface structure, thus producing the reactive sites with low coordination numbers. This reconstructed atomic surface also accompany to generate more oxygen vacancies, thus greatly improving the catalytic activity. Compared to pure W 18 O 49 , significantly improves oxidative desulfurization performance can be achieved over Mo-W 18 O 49 -P, and deep desulfurization is realized within 3 h. Moreover, the optimal Mo-W 18 O 49 -P shows better stability than pure W 18 O 49 , which can be recycled for 12 times. This work provides an accessible pathway for cooperative enhancing the catalytic oxidative desulfurization activity of oxide catalysts.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Konghao Han,Zilong Yan,Zhuang Ding,Pengfei Zhou,Cheng Ye,Ling Qin,Zhiyong Bao,Maofeng Zhang,Wei Zhang
The proliferation of micro/nanoplastics (MNPs) has emerged as a pivotal environmental issue, largely due to their potential for human exposure. Consequently, the development of sensitive and efficient detection methodologies is paramount for elucidating their environmental footprint. Here, we report a novel three-dimensional (3D) surface-enhanced Raman scattering (SERS) sensor, which integrate Ti 3 C 2 T x /TiO 2 /W 18 O 49 semiconductor heterostructure, for the rapid and sensitive detection of MNPs in environmental matrices. The sensor's unique layered architecture and efficient charge transfer mechanism endow it with high sensitivity. It has demonstrated remarkable detection capabilities, achieving a sensitivity of 10 −8 M for Rhodamine 6G (R6G), equating to an enhancement factor (EF) of 2.33 × 10 6 . This level of sensitivity allows for the detection of polystyrene (PS) microplastics at concentration as low as 25 μg/mL, with a relative standard deviation (RSD) of 12.58 %, signifying superior reproducibility. Moreover, the sensor's fingerprinting capabilities enable the identification of a variety of MNPs, including polyethylene (PE) and polyethylene terephthalate (PET), thus facilitating the analysis of complex MNPs mixtures. The sensor's applicability to real-world samples was confirmed through the quantitative detection of PS microplastics in rainwater, soil, and industrial wastewater, with a detection limit of 25 μg/mL and exhibiting good linearity. It is concluded that the 3D SERS sensor is a promising tool for the rapid and precise detection of MNPs across diverse environmental matrices. The advent of this technology marks a significant leap forward in environmental analysis, providing a robust method for the monitoring of MNPs pollution.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Jiafa Chen,Peng Bai,Shibo Yuan,Yi He,Zifan Niu,Yicheng Zhao,Yongdan Li
Designing highly efficient photocatalyst for the valorization of CO 2 is an ideal strategy to reduce greenhouse gas emissions and utilize solar energy. In this study, a S-scheme heterojunction photocatalyst is fabricated by solvothermal impregnation of ZnO on W 18 O 49 for photocatalytic CO 2 N -formylation of aniline. The localized surface plasmon resonance effect of W 18 O 49 improves the absorption capacity for long-wave light significantly, and the hot electrons generated in W 18 O 49 with a high energy can migrate to the conduction band of ZnO and thus enhance the photocatalytic reduction ability. Meanwhile, the S-scheme heterojunction facilitates the separation of photoinduced charge carriers and preserves the redox ability of W 18 O 49 /ZnO composite photocatalyst. The conversion of aniline reaches 99.1% after 5 h reaction under visible light irradiation at room temperature with an N -formylaniline selectivity of 100%. A possible photocatalytic reaction mechanism is proposed. This study paves a promising way for the design of highly efficient photocatalyst and the sustainable utilization of CO 2 .
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Yizhi Wang,Shuo Wang,Fan Li,Yan Wang,Huairuo Zhang,Chunwen Sun
Highly active and durable electrocatalysts are vital for commercialization of direct methanol fuel cells. In this work, a three-dimensional nanocomposite consisting of platinum nanoparticles, W18O49 nanocables, and reduced graphene oxide composite (Pt/W18O49 NCs–rGO) has been prepared as an electrocatalyst for methanol oxidation reaction (MOR). The catalyst is prepared through a two-step method. The W18O49 nanocables and the reduced graphene oxide composite are prepared by a solvothermal process. Then, Pt nanoparticles are loaded on the W18O49 nanocables and the reduced graphene oxide composite by a hydrogen reduction at ambient condition. The obtained catalyst has a special three-dimensional architecture consisting of two-dimensional nanosheets, assembled one-dimensional nanocables, and the loaded nanoparticles on their surface. The Pt/W18O49 NCs–rGO catalyst shows 1.56 time mass activities than the Pt/C, with the current density of the forward anodic peak reaching 1624 mA/mgPt at 0.854 V versus reversible hydrogen electrode potential in 0.1 M HClO4 and 0.5 M CH3OH mixed electrolyte. It also shows a strong antipoisoning property toward CO. For the durability testing, the current density of Pt/W18O49 NCs–rGO shows a 37% decay, whereas the current of Pt/C catalyst shows a 41% degradation from 600 to 3600 s at 0.7 V. The high activity toward MOR, good antipoisoning for intermediate products, and excellent stability are ascribed to strong metal–support interaction effects between the Pt nanoparticles and the W18O49 NCs.
研究领域:
材料科学
·
能源化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xinyu Li,Fei Ye,Hui Zhang,Munir Ahmad,Zhenxing Zeng,Shuaijie Wang,Sufeng Wang,Dawei Gao,Qingrui Zhang
Integrating g-C 3 N 4 with narrow-band semiconductor to construct a Z-scheme structured heterojunction has been regarded as a common strategy to improve the photocatalytic performance of g-C 3 N 4 . However, limited catalytic activity increment is achieved due to the contradiction of expanding the light absorption scope of traditional photo-oxidation semiconductors (PS II) and preserving their valance band oxidative abilities. Herein, to extend the light absorption range of g-C 3 N 4 based Z-scheme photocatalyst to the whole solar spectra while without losing the high oxidative ability of this system, we select the heavy doped W 18 O 49 as PS II and provide a facile in situ hydrothermal method to elaborately fabricate an rGO decorated W 18 O 49 @g-C 3 N 4 (r-CNW) Z-scheme photocatalyst. The prepared r-CNW-2 (with optimal W 18 O 49 to g-C 3 N 4 weight ratio of 1:2) exhibits improved photocatalytic performance with H 2 O 2 generation rates of 71, 58.5 and 6.3 μmol g −1 h −1 obtained under the simulated solar light, visible light (>400 nm) and NIR light (>800 nm) irradiation, respectively, which is 1.3 and 2 times higher than those of the g-C 3 N 4 counterparts (54, 29 μmol g −1 h −1 and even not detected).such outstanding performance of r-CNW-2 could be associated with the broader light absorption, fast charge separation, and rapid redox reactions. Moreover, the r-CNW-2 also displays an excellent E-coli inactivation activity, comparable to most g-C 3 N 4 -based photocatalysts. Our work gives a new insight through trading off light absorption and redox ability to fabricate efficient Z-scheme photocatalyst for photocatalytic H 2 O 2 generation and environmental remediation.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Guojuan Hai,Jianfeng Huang,Liyun Cao,Koji Kajiyoshi,Long Wang,Liangliang Feng
The development of heterostructure electrocatalysts with abundant active sites as binderless electrodes is crucial for the improvment of the catalytic efficiency. Herein, the CoOOH/W 18 O 49 heterojunction grown on nickel foam (abbreviated as Pre-CoOOH/W 18 O 49 /NF) was fabricated via a facile solvothermal method. It is found that in situ electrochemical reconstruction induces the amorphization of the non-stoichiometric tungsten oxide and effectively changes the interfacial interaction, which enables the electrons at the heterojunction interfaces to be redistributed. The Co 2+ /Ni 2+ ions successfully optimize the valence configuration of tungsten (W) sites, leading to a high proportion of W 4+ and Co 3+ /Ni 3+ active sites. Simultaneously, the potential of the flat band becomes more negative than the reduction potential of hydrogen for the water splitting, so as to achieve enhanced intrinsic hydrogen evolution activity. As expected, the reconstruction contributes to more efficient electrocatalytic activity compared with that of the direct hydrogen/oxygen evolution in alkaline solution. The activated CoOOH/W 18 O 49 /NF electrode (abbreviated as Act-CoOOH/W 18 O 49 /NF) with the optimized amorphous-crystalline interface shows low overpotentials of 89 and 198 mV at 10 and 20 mA cm −2 for HER and OER, respectively. It only needs 1.55 V (10 mA cm −2 ) decomposition voltage for overall water splitting and retains a high stability at least 50 h.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 9
·097301
·
IF 1.321
Ang Li,Jin-Lei Wu,Xue-Song Xu,Yang Liu,Ya-Nan Bao,Bin Dong
The W18O49 nanoflowers with a diameter of 500 nm are prepared by a facile hydrothermal method. The Er–Yb: NaYF4 nanoparticles are adsorbed on the petals (the position of the strongest local electric field on W18O49 nanoflowers). With a 976 nm laser diode (LD) as an excitation source, the selectively green upconversion luminescence (UCL) is observed to be enhanced by two orders of magnitude in Er–Yb: NaYF4/W18O49 nanoflowers heterostructures. It suggests that the near infrared (NIR)-excited localized surface plasmon resonance (LSPR) of W18O49 is primarily responsible for the enhanced UCL, which could be partly reabsorbed by the W18O49, thus leading to the selective enhancement of green UCL for the Er–Yb: NaYF4. The fluorescence intensity ratio is investigated as a function of temperature based on the intense green UCL, which indicates that Er–Yb: NaYF4/W18O49 nanoflower heterostructures have good potential for developing into temperature sensors.
研究领域:
材料科学
·
光学
·
纳米技术
·
温度传感
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiangchao Hui,Lifen Li,Qineng Xia,Song Hong,Leiduan Hao,Alex W. Robertson,Zhenyu Sun
The direct photochemical N 2 reduction reaction boasts the potential for clean and sustainable NH 3 manufacturing, yet achieving this remains a significant challenge. To activate and cleave the nonpolar N≡N bond and accelerate the transport and separation of charge carriers during photocatalysis , the design and facile synthesis of active, robust, cheap, and earth-abundant photocatalysts is crucial. Here, we demonstrate efficient and stable visible light fixation of N 2 to NH 3 by constructing a novel heterostructure consisting of two-dimensional Sb 2 O 3 nanosheets and one-dimensional W 18 O 49 nanowires . A remarkable NH 3 production rate of up to 731 μg NH3 h −1 g cat. −1 is attained in visible light over the nanocomposite without cocatalyst, 5.5-fold and 3.4-fold improvement over that of discrete Sb 2 O 3 and W 18 O 49 respectively, which also significantly exceeds many previous reported photocatalytic systems. The superior photocatalytic performance can be attributed to the unique structure of the composites, which provides ample exposed surface catalytic sites with a high density of oxygen vacancies, promoting the adsorption and activation of N 2 molecules to form *NNH. Equally importantly, the interface between Sb 2 O 3 and W 18 O 49 greatly facilitates charge carrier migration and separation. Further density functional theory calculations manifest that the interfacial metal sites on Sb 2 O 3 /W 18 O 49 serve as the main active centers which possess a strong donating electron ability to the empty N 2 antibonding orbitals to trigger the following NH 3 synthesis. This work provides a simple and effective method to modify metal oxides for enhancing N 2 photofixation.
研究领域:
材料科学
·
催化
·
光化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Mei Li,Shengbo Zhang,Mohammed Ahmed Abdulraheem Alwafi,Jinyu Han,Xinli Zhu,Qingfeng Ge,Hua Wang
The morphology of catalysts is a key factor influencing their photocatalytic performance. Herein, we prepared three W 18 O 49 photocatalysts with different morphologies of sea urchin (W 18 O 49 SU), nanorod (W 18 O 49 NR) and hollow sphere (W 18 O 49 HS), and evaluate their performances in photocatalytic hydrolysis of ammonia borane (AB). Remarkably, W 18 O 49 SU exhibited an impressive photocatalytic H 2 production rate with the highest TOF of 53.1 min −1 under visible light, which is 10.4 and 7.5 times higher than those of W 18 O 49 HS and W 18 O 49 NR, respectively. The comprehensive characterizations and control experiments revealed that the unique sea urchin-like morphology enabled the strong light harvesting by multiple light scattering, fast separation of photogenerated charges and directional electron enrichment by nanotip effect, which collaboratively boost the photocatalytic activity . Moreover, the enhancement effect of sea urchin-like morphology is again approved well on Nb 2 O 5 photocatalysts. This work opens a paradigm to synergistically improve light harvesting and charge separation efficiency through rational design of photocatalyst nanostructure .
研究领域:
材料科学
·
光催化
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shumin Zhu,Qingdong Ruan,Xingwang Zhu,Dan Li,Bin Wang,Chao Huang,Liangliang Liu,Fangyu Xiong,Jianjian Yi,Yanhua Song,Jinyuan Liu,Huaming Li,Paul K. Chu,Hui Xu
Enhancing the activation of peroxymonosulfate (PMS) is essential for generating more reactive oxygen species in advanced oxidation process (AOPs). Nevertheless, improving PMS adsorption and expediting interfacial electron transfer to enhance reaction kinetics pose significant challenges. Herein, we construct confined W 18 O 49 nanowires with asymmetric active centers containing Co-Vo-W (Vo: oxygen vacancy). The design incorporates surface-rich Vo and single-atom Co, and the resulting material is employed for PMS activation in water purification. By coupling unsaturated coordinated electrons in Vo with low-valence Co single atoms to construct an the “electron fountainhead”, the adsorption and activation of PMS are enhanced. This results in the generation of more active free radicals (SO 4 •- , •OH, •O 2 - ) and non-free radicals ( 1 O 2 ) for the decomposition of micropollutants. Thereinto, the degradation rate of bisphenol A (BPA) by Co-W 18 O 49 is 32.6 times faster that of W 18 O 49 monomer, which is also much higher than those of other transition-metal-doped W 18 O 49 composites. This work is expected to help to elucidate the rational design and efficient PMS activation of catalysts with asymmetric active centers.
研究领域:
环境科学
·
催化
·
水处理
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）