JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Chen Wang,Peng Shi,Chao Guo,Rui Guo,Jiangyuan Qiu
Cobalt-based oxide CuCo 2 O 4 -loaded CuCo 2 O 4 /carbon felt (CF) composite cathodes were synthesized by hydrothermal deposition of a precursor of Cu/Fe oxides on CF followed by roasting in air. The material serves both catalytic and cathodic dual functions in the heterogeneous electro-Fenton (EF) process. Through XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), XPS (X-ray photoelectron spectroscopy), SEM (scanning electron microscope), and catalytic experiments, it was concluded that CuCo 2 O 4 loading was successful and the highest hydrophilic 180-CuCo 2 O 4 /CF was obtained by varying the hydrothermal temperature without destroying the original structure. 180-CuCo 2 O 4 /CF accomplished 98.03 % degradation in 60 min, and it was found to maintain high degradation capacity in the pH 3 ∼ 9 range in experiments where the experimental parameters were varied. Compared to monometallic oxides, Cu and Co dual active centers are integrated in CuCo 2 O 4 , giving it diverse redox properties and oxidation states. As a result, the CuCo 2 O 4 /CF material can realize the dual function of catalytic and cathodic, which provides a new development direction in practical wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 43
·17104-17115
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IF 3.069
Lisha You,Minghuan Gao,Tiesheng Li,Linna Guo,Penglei Chen,Minghua Liu
Semiconductor-based photocatalysis attracts wide attention owing to its ability to directly utilize solar energy for the production of solar fuels. In particular, the construction of Z-scheme heterojunctions is demonstrated to benefit the photocatalytic performance because of the separation and transfer of the photogenerated charge carriers and well-preserved strong redox ability. In this work, a series of Z-scheme Ag3PO4/WO3 p–n junction photocatalysts were prepared employing a facile impregnation method. The photocatalysts (Ag3PO4/WO3 p–n junction) presented enhanced photo-degradation efficiency; for example, with AW-45, 99.9% degradation could be obtained for RhB (30 ppm) on irradiation (λ > 420 nm, 350 W xenon lamp) for 7 min, which is a great improvement compared with the individual constituents. The degradation rate for AW-45 was 27 times higher than that of a commercial powder (P25). The apparent kinetic rate of catalytic degradation was obtained according to the results from the degradation process. The mechanism for electron transfer between Ag3PO4 and WO3 was also investigated. The reduction and oxidation processes concentrated on the CB (conducting band) of Ag3PO4 and the VB (valence band) of WO3, resulting in promoting the mechanism for photocatalytic degradation in the Z-scheme Ag3PO4/WO3 p–n junction photocatalysts.
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
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Lan Guo,Yuan Liu,Rongmei Kong,Guang Chen,Hao Wang,Xiuli Wang,Lian Xia,Fengli Qu
β-Glucuronidase (β-GCU) is closely related to the occurrence of multiple diseases, and it has been applied as a biomarker and therapeutic target in clinical diagnosis. However, reliable methods with high selectivity and sensitivity for monitoring β-GCU are still lacked. Herein, we designed a novel fluorescent nanoprobe, rhodamine B encapsulated MOF-5 (RhB@MOF-5) for the first time, to detect β-GCU through the synergistic effect of inner filter effect (IFE) and static quenching effect (SQE) by employing 4-nitrophenyl-β-D-glucuronide (PNPG) as the substrate. After encapsulating into MOF-5, the fluorescence emission of RhB at 550 nm excited by 320 nm was greatly enhanced. The major overlap between the fluorescence excitation spectrum of RhB@MOF-5 (about 320 nm) and the ultraviolet absorption spectrum of PNPG (about 310 nm) lead to PNPG being a good IFE absorber in this sensing system. Under the optimized conditions, the excitation spectrum of the RhB@MOF-5 could be absorbed by PNPG, resulting in the dramatically decrease of fluorescence emission. After adding β-GCU into the system, the substrate of PNPG would be enzymatic hydrolyzed to p -nitrophenol (PNP) and glucose, then the IFE disappearance and the fluorescence recovered. The current sensing platform was interference-free and exhibited a broad linearity relationship for β-GCU range of 0.1–10 U L −1 (R 2 = 0.9957) with a limit of detection as low as 0.03 U L −1 , which was reduced by more than one orders compared with the reported methods. Moreover, the encapsulation of dyes using porous nanoparticles to achieve some tailor-made characteristics will enrich experimental design inspiration.
研究领域:
生物化学
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医学诊断
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材料科学
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DOI
高影响因子
Materials
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2022
·Vol. 15
·期 11
·3761
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IF 3.748
Lei Wu,Doudou Qin,Fan Fang,Weifeng Wang,Wenying Zhao
Severe environmental pollution is caused by the massive discharge of complex industrial wastewater. The photocatalytic technology has been proved as an effective way to solve the problem, while an efficient photocatalyst is the most critical factor. Herein, a new photocatalyst MIL-68(Ga)_NH2was obtained by hydrothermal synthesis and were characterized by PXRD, FTIR,1H NMR, and TGA systematically. The result demonstrates that MIL-68(Ga)_NH2crystallized in orthorhombic system andCmcmspace group with the unit cell parameters:a= 36.699 Å,b= 21.223 Å,c= 6.75 Å,V= 5257.6 Å3, which sheds light on the maintenance of the crystal structure of the prototype material after amino modification. The conversion of Cr(VI) and binary pollutant Cr(VI)/RhB in wastewater under visible light stimulation was characterized by the UV-vis DRS. Complementary experimental results indicate that MIL-68(Ga)_NH2exhibits remarkable photocatalytic activity for Cr(VI) and the degradation rate reaches as high as 98.5% when pH = 2 and ethanol as hole-trapping agent under visible light irradiation with good reusability and stability. Owing to the synergistic effect between Cr(VI) and RhB in the binary pollutant system, MIL-68(Ga)_NH2exhibits excellent catalytic activity for both the pollutants, the degradation efficiency of Cr(VI) and RhB was up to 95.7% and 94.6% under visible light irradiation for 120 min, respectively. The possible removal mechanism of Cr(VI)/RhB based on MIL-68(Ga)_NH2was explored. In addition, Ga-based MOF was applied in the field of photocatalytic treatment of wastewater for the first time, which broadened the application of MOF materials in the field of photocatalysis.
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
Biosensors-Basel
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2022
·Vol. 12
·期 7
·544
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IF 5.743
Jingyi Li,Ning Zhang,Xin Yang,Xinting Yang,Zengli Wang,Huan Liu
This study presents a novel composite thin film based on rhodamine B encapsulated into MOF-5 (Metal Organic Frameworks) as a fluorescence sensor for the real-time detection of the freshness of chilled pork. The composite film can adsorb and respond to the volatile amines produced by the quality deterioration of pork during storage at 4 °C, with the fluorescence intensity of RhB decreasing over time. The quantitative model used for predicting the freshness indicator (total volatile base nitrogen) of pork was built using the fluorescence spectra (excited at 340 nm) of the RhB@MOF-5 composite film combined with the partial least squares (PLS) algorithm, providing Rc2and Rp2values of 0.908 and 0.821 and RMSEC(root mean square error of calibration) and RMSEP (root mean square error of prediction) values of 3.435 mg/100 g and 3.647 mg/100 g, respectively. The qualitative model established by the partial least squares discriminant analysis (PLS-DA) algorithm was able to accurately classify pork samples as fresh, acceptable or spoiled, and the accuracy was 86.67%.
研究领域:
食品科学
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传感技术
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生物化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Yan Sang,Xi Cao,Guangdong Dai,Lvxuan Wang,Yin Peng,Baoyou Geng
The construction of heterojunction system can promote the separation and transfer of photogenerated electron-hole pairs, which is conducive to the degradation of sewage. In this paper, heterostructured Bi 2 O 3 /Bi 2 S 3 nanoflowers are fabricated by a one-step hydrothermal method. The microstructure and optical absorption properties are studied through the detailed characterization of this heterojunction. The visible light photocatalytic ability of as-prepared Bi 2 O 3 /Bi 2 S 3 heterojunctions are investigated by photocatalytic removals of RhB and Cr(VI). The results of photocatalysis indicate that removal efficiencies of RhB and Cr(VI) over Bi 2 O 3 /Bi 2 S 3 heterojunction are higher than those of pure Bi 2 O 3 and Bi 2 S 3 . The improved photocatalytic performance of the Bi 2 O 3 /Bi 2 S 3 heterojunctions could be attributed to a combination of the p-n junction between the p-type Bi 2 S 3 and n-type Bi 2 O 3 , and large specific surface areas (46.31 m 2 g −1 ). Moreover, the probable photocatalytic mechanism of composite photocatalysts is explored in detail by active species trapping experiments, N 2 adsorption–desorption, the transient photovoltage electrochemical impedance spectroscopy and photoluminescence measurements. This work provides new insights into building of the efficient and novel heterogeneous photocatalysts and other energy-related devices.
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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2018
·Vol. 8
·期 39
·22095-22102
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IF 2.936
Yunfeng Ma,Lili Yang,Yong Yang,Yusi Peng,Yuquan Wei,Zhengren Huang
In this study, g-C3N4/Ag hybrid nanostructures were fabricated by facilely decorating silver nanoparticles on atmosphere-treated g-C3N4 and served as efficient SERS-active substrates. The observed significant SERS enhancement of crystal violet (CV) molecules on g-C3N4/Ag could be attributed to the high ability to concentrate target molecules through π–π stacking interactions and the near-field enhancement caused by the boosting SPR effect of the Ag NPs. The atmosphere and calcination time have a considerable impact on the SERS enhancement effect of the g-C3N4/Ag substrate. Furthermore, it took only 10 min to degrade dye molecules under visible light, and after 6 cycles the g-C3N4/Ag substrates still maintained sensitive SERS activity. This research indicates that g-C3N4/Ag hybrids can be applied as reusable SERS substrates.
研究领域:
材料科学
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光谱学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Materials Advances
·
2022
·Vol. 3
·期 20
·7546-7558
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IF 0
Hecheng Ma,Jianjun Liu,Yimeng Wang,Shengli Zuo,Yingchun Yu,Baoshan Li
Photocatalytic degradation has been developed as a promising strategy for environmental remediation. Black phosphorus (BP) has attracted much attention in the field of photocatalysis due to the adjustable bandgap and high carrier mobility. In this work, we constructed a flower-like BP nanosheet/P-doped BiOCl (BP/P-BiOCl) S-scheme heterostructure via a simple co-precipitation method. The physicochemical properties such as the crystallinity, morphology, chemical environment, and optical and electronic properties of the as-fabricated materials were analyzed by using different analytical techniques. SEM data indicated the successful formation of a flower-like structure of BP/P-BiOCl composites. X-Ray photoelectron spectroscopy data indicated the formation of P-doped BiOCl. X-Ray diffraction and high resolution-TEM data revealed the formation of a hierarchical BP/P-BiOCl heterostructure. The catalytic activity of the as-synthesized samples (15%-BP/P-BiOCl) was tested towards RhB degradation (96% of 20 ppm RhB solution) and Cr(VI) reduction (90% of 20 ppm Cr(VI) solution) under solar light illumination. We demonstrated the formation mechanism of a flower-like structure in which positively charged BPNs assembled with negatively charged P-BiOCl by electrostatic attraction. Furthermore, we revealed the S-scheme photocatalytic mechanism to prove the enhanced photocatalytic activity of BP/P-BiOCl composites. The photodegradation of phenol, radical species trapping experiments and charge transfer route test were performed to prove the formation of the S-scheme. This work provides a facile route for the construction of a flower-like S-scheme heterostructure photocatalyst for efficient solar light photocatalytic performance.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 7
·4482-4496
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IF 2.779
Wang Tao,Ding Huihui,Xiao Huan,Sun Tianyi,Xu Jiahui,Zhang Zhengmei,Bian Haiqin,Li Shuang,Zhang Hengyang
In this article, P-g-C 3 N 4 /TiO 2 (the protonated g-C 3 N 4 is noted as P-g-C 3 N 4 ) heterojunction photocatalytic materials with hollow sphere structure were synthesized mainly by high-temperature calcination and secondary hydrothermal methods. To obtain highly efficient heterojunction catalytic materials with more uniform surface compounding, we protonated and exfoliated ultrasonically the obtained g-C 3 N 4 before compounding further, which changed its morphology while retaining its semiconductor properties and optical band gap unchanged, and finally obtained the ultra-thin nanoflake structures. On this basis, an optimal proportion of the highest catalytic activity between these two substances was explored by degrading RHB. It was found that the highest catalytic activity of the complexes was achieved at 110 min with a weight ratio of 0.1 of P-g-C 3 N 4 to TiO 2 after protonating under the same conditions, and complete degradation was reached at 110 min. Afterward, to further investigate its physicochemical properties, we made various characterizations and proposed a suitable catalytic mechanism of Z-scheme regarding its excellent catalytic properties.
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
RSC Advances
·
2020
·Vol. 10
·期 33
·19149-19156
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IF 3.119
Liu Yang,Yu-Long Liu,Cheng-Guo Liu,Ying Fu,Fei Ye
A RhB@Zr-MOF composite with dual-emission properties was successfully constructed, which comprises a zirconium-based metal–organic framework and the luminescent dye molecule, Rhodamine B (RhB), embedded via the encapsulation method. The fluorescence intensity ratio of the two emissions was found to be ca. 370 nm/590 nm for RhB@Zr-MOF. The fluorescence intensity values of the two emissions of RhB@Zr-MOF can also be affected by the structures of analytes containing different organic groups. Due to the existence of the dual-emission properties in RhB@Zr-MOF, the relative fluorescence intensity of the emission peaks was introduced as a detection index instead of absolute fluorescence intensity. RhB@Zr-MOF, which possesses the characteristics of a built-in self-calibrating fluorescence sensor, was investigated for detecting cations, nitroaromatics and pesticides. Aside from high sensitivity and selectivity, recyclability is the most important property for sensing pesticides. This work shows that RhB@Zr-MOF can maintain its stability after 5 cycles of detecting nitenpyram, with LOD of 0.2 μM. These results demonstrate that dye@MOFs with dual-emission properties can be employed as multifunctional fluorescence sensors for different types of analytes, and that RhB@Zr-MOF provides a new paradigm for analyte sensing.
研究领域:
材料科学
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xue Bai,Jia Jia,Yanyan Du,Xiaoyun Hu,Jianli Li,Enzhou Liu,Jun Fan
This is the first time we report that P-doped anatase titanium oxide (TiO 2 ) nanosheets can be fabricated by red phosphorus (RP) and TiO 2 nanosheets using simply hydrothermal method, accompanying variation in surface species viz. Ti 4+ , O 2− , Ti 3+ , oxygen vacancies ( V o ) and P 5+ . The defect and impurity levels induced by moderate doping could facilitate the formation of charge trap centers or avoid the formation of charge recombination centers, resulting in remarkably enhanced photocatalytic activity . Moreover, the enhanced optical absorbance and transfer performance of photo-generated carriers were studied using UV–Vis spectroscopy, photoelectric spectrometry and TR-PL. Importantly, the formation of Ti-O-P bands may accelerated transmission of electrons, giving rise to the effective separation of photo-generated carriers. To the best of our knowledge, the Cr (VI) reduction and RhB removal rate obtained by this hybrid show comparatively competitive among other reports so far. It is believed that this work provide a promising approach for building a novel pathway for electron transport and more photocatalytic reaction centers on photocatalysts.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Chong Xu,Fan Yang,Bijian Deng,Sai Che,Wang Yang,Ge Zhang,Yankun Sun,Yongfeng Li
A novel photocatalyst of rGO-wrapped Ti 3 C 2 /TiO 2 nanowires ((Ti 3 C 2 /TiO 2 )@rGO) was successfully synthesized to remove hexavalent chromium (Cr(VI)) and Rhodamine B (RhB) from wastewater. Among the prepared photocatalysts, (Ti 3 C 2 /TiO 2 )@rGO-15 showed the highest photocatalytic activity in both single and mixed pollutant solutions. The excellent photocatalytic activity was ascribed to the enhanced separation efficiency of e - and h + resulted from the Schottky barrier established in (Ti 3 C 2 /TiO 2 )@rGO. Ti 3 C 2 gathered the stimulated electrons originated from TiO 2 and further transferred them to rGO , thus enhancing the separation efficiency of e - and h + . Furthermore, different scavengers were employed to determine the reactive species involved in the photocatalytic reaction system. This work may provide a promising way to promote the separation efficiency of e - and h + via appropriate incorporation of co-catalyst.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）