JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 7
·4250-4260
·
IF 2.2
Zhao Yuan,Jiang Kanrui,Wang Wei,Chen Wenjing,Liu Qiutan,Zhi Guowei
Metal oxide semiconductors have been proven to be a very effective photocatalytic material. In this study, Au-WO 3 was successfully synthesized through a microwave irradiation-assisted one-pot method. The results demonstrated that the hydration degree of WO 3 · n H 2 O could be controlled by Au, and the nanorods could be refined. When the optimum Au modification level was 5.4 wt.%, the specific surface area of WO 3 · n H 2 O increased from 36.67 m 2 g −1 to 71.72 m 2 g −1 , indicating that active sites on the catalyst surface were added. The photocatalytic degradation of rhodamine B (RhB) is considered to assess the photocatalytic performance of the Au-WO 3 nanoparticles under visible light. The deterioration of the sample increased initially, then decreased as the Au level increased. The photocatalytic degradation capacity was strongest when the Au content was 5.4 wt.%, and the degradation rate was 0.0084 min −1 .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Fubin Pei,Shasha Feng,Yi Wu,Xuchu Lv,Hualai Wang,Shen-Ming Chen,Qingli Hao,Yang Cao,Wu Lei,Zhaoyang Tong
Aflatoxin B1 (AFB1) is the most toxic mycotoxin , is widely found in foods and animal feeds, and can pose a serious threat to our lives. A label-free photoelectrochemical (PEC) immunosensor was fabricated for the sensitive detection of AFB1. A Z-scheme heterojunction of gold nanoparticles (Au NPs) loaded on graphitic carbon nitride sheet and tungsten trioxide sphere composite (g-C 3 N 4 /Au/WO 3 ) acted as the highly sensitive platform. The g-C 3 N 4 /Au/WO 3 is capable, not only of immobilizing antibodies via Au NPs, but also enhancing the separation of electron-hole pairs due to its good energy band matching efficiency. The mechanism of photo-generated electron/hole transfer on g-C 3 N 4 /Au/WO 3 was explored using scavengers to eliminate active components. On this basis, an electron transfer pathway for the immunosensor was deduced. The PEC immunosensor displayed a linear concentration range from 1.0 pg mL −1 to 100 ng mL −1 and a low detection limit of 0.33 pg mL −1 (S/N = 3) for AFB1. Good reproducibility, stability, and specificity provide a solid foundation for the practical application of this immunosensor.
研究领域:
食品安全
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yechen Wang,Yaru Wang,Jianjun Zhao,Yiming Xu
Production of H 2 O 2 via semiconductor photocatalysis has received an increasing attention. Herein the effects of cations in perchlorate form and anions in sodium form are examined. Experiment was conducted with Au/WO 3 under visible light in presence of methanol. The production of H 2 O 2 was greatly promoted by A (Ni 2+ , PO 4 3− , CO 3 2− , and F − ), slightly increased by B (SO 4 2− , NO 3 − , Cl − , and ClO 4 − ), greatly inhibited by C (Cu 2+ , and Fe 3+ ), and slightly decreased by Co 2+ . Moreover, the effect of Ni 2+ was weakening by F − , and vice versa. Analysis showed that Ni 2+ was oxidized into Ni 3+ , reactive to methanol, not to water. On Au/WO 3 electrode, anions A inhibited O 2 reduction, and promoted methanol photo-oxidation, while all anions had little influence on the pathway of O 2 reduction. A plausible mechanism is proposed, involving the hole oxidation of anions (not F − ), followed by methanol oxidation. This work highlights the importance of inorganic ions to the selective reduction of O 2 .
研究领域:
光催化
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yechen Wang,Yaru Wang,Jianjun Zhao,Min Chen,Xubo Huang,Yiming Xu
Production of H 2 O 2 via a more economic, green and safe way is challenging. In this work, we report an efficient production of H 2 O 2 from oxygen reduction reaction (ORR) in aqueous solution over a modified WO 3 with Au nanoparticles . Under visible light at wavelengths longer than 420 nm for 5 h, H 2 O 2 measured from WO 3 and Au/WO 3 were 1.07, and 177 μM, respectively. On addition of methanol, H 2 O 2 obtained from WO 3 , Au/WO 3 , and Au/SiO 2 were 8.55, 544, and 0.36 μM, respectively. Photoluminescence and electrochemical measurement revealed that there was an interfacial electron transfer from the excited WO 3 to Au, followed by two-electron reduction of O 2 on Au sites. Under visible light at wavelengths longer than 535 nm, interestingly, H 2 O 2 was also produced from Au/WO 3 (39 μM at 5 h), while the photocurrent of water oxidation on Au/WO 3 was much larger than those on Au/SiO 2 and WO 3 . Clearly, there is also an interfacial electron transfer from the plasmonic Au to WO 3 , followed by ORR to H 2 O 2 , but such a process fails when WO 3 is excited. However, the production of H 2 O 2 on Au/WO 3 was determined by several factors, including Au content, light absorption, and particle size. A maximum H 2 O 2 was observed at an initial pH 3.0 from 0.35 wt% Au/WO 3 , prepared at 400 °C. Moreover, at the same loading on WO 3 , Au was more efficient than Pd, Ag, Pt, Ni, Cu, and Co, while at the same Au loading, WO 3 was more efficient than BiVO 4 and Bi 2 WO 6 . The superior performance of Au/WO 3 is mainly due to its ability to undergo selective ORR to H 2 O 2 , and to release protons into aqueous solution protecting H 2 O 2 from decomposition.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Congcong Piao,Jianhe Tang,Yitong Lin,Zhiyu Liu,Xueke Liu,Dawei Fang,Jun Wang
A high-efficiency Z-scheme photocatalyst, Er 3+ :YAlO 3 @(Au/SrTiO 3 )-Au-WO 3 , is fabricated successfully via hydrothermal and photo-deposition methods. All as-prepared samples are characterized by XRD, SEM, TEM, FT-IR, EDX, XPS, Raman spectroscopy, PL and DRS. The activity of the prepared Z-scheme Er 3+ :YAlO 3 @(Au/SrTiO 3 )-Au-WO 3 photocatalyst is evaluated through photocatalytic conversion of Cr(VI) under simulated solar light irradiation. The meaningful influencing factors such as simulated solar light irradiation time, light intensity, sacrificial agents and cycling times are investigated. The results displayed that the existence of Er 3+ :YAlO 3 can improve the utilization ratio of solar light for wide band-gap SrTiO 3 . Moreover, the formation of Z-scheme SrTiO 3 /WO 3 photocatalytic system and the introduction of Au nanoparticles as electron mediator and co-catalyst can promote the separation of photo-induced electron and hole to obtain much high photocatalytic activity . Finally, the mechanism on conversion of Cr(VI) caused by Z-scheme Er 3+ :YAlO 3 @(Au/SrTiO 3 )-Au-WO 3 photocatalyst is put forward. © 2021 Elsevier B.V. All rights reserved.
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
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Lihua Zhi,Shengya Zhang,Min Li,Jibing Tu,Xiaoquan Lu
The exploration of new strategies for portable detection of mercury ions with high sensitivity and selectivity is of great value for biochemical and environmental analyses. Herein, a straightforward, convenient, label-free, and portable sensing platform based on a Au nanoparticle (NP)-decorated WO3 hollow nanoflower was constructed for the sensitive and selective detection of Hg(II) with a pressure, temperature, and colorimetric triple-signal readout. The resulting Au/WO3 hollow nanoflowers (Au/WO3 HNFs) could efficaciously impede the aggregation of Au NPs, thus significantly improving their catalytic activity and stability. The sensing mechanism of this new strategy using pressure as a signal readout was based on the mercury-triggered catalase mimetic activity of Au/WO3 HNFs. In the presence of the model analyte Hg(II), H2O2 in the detection system was decomposed to O2 fleetly, resulting in a detectable pressure signal. Accordingly, the quantification of Hg(II) was facilely realized based on the pressure changes, and the detection limit could reach as low as 0.224 nM. In addition, colorimetric and photothermal detection of Hg(II) using the Au/WO3 HNFs based on their mercury-stimulated peroxidase mimetic activity was also investigated, and the detection limits were calculated to be 78 nM and 0.22 μM for colorimetric and photothermal methods, respectively. Hence, this nanosensor can even achieve multimode determination of Hg(II) with the concept of point-of-care testing (POCT). Furthermore, the proposed multimode sensing platform also displayed satisfactory sensing performance for the Hg(II) assay in actual water samples. This promising strategy may provide novel insights on the fabrication of a multimode POCT platform for sensitive, selective, and accurate detection of heavy metal ions.
研究领域:
分析化学
·
环境科学
·
生物医学工程
✓ 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）