CHINESE JOURNAL OF CATALYSIS
·
2019
·Vol. 40
·期 5
·631-637
·
IF 4.914
Zhenmin Xu,Ru Zheng,Yao Chen,Jian Zhu,Zhenfeng Bian
Ordered mesoporous Fe/TiO 2 was prepared by an evaporation-induced self-assembly method. The iron ions were in situ embedded in the pore wall of the TiO 2 framework. The catalyst has excellent light-assisted Fenton catalytic performance under UV and visible light irradiation. X-ray diffraction and transmission electron microscopy results showed that the TiO 2 samples have an ordered two-dimensional hexagonal pore structure and an anatase phase structure with high crystallinity . The ordered pore structure of the TiO 2 photocatalyst with a large specific surface area is beneficial to mass transfer and light harvesting. Furthermore, iron ions can be controlled by embedding them into the TiO 2 framework to prevent iron ion loss and inactivation. After five cycles, the reaction rate of the ordered mesoporous Fe/TiO 2 remained unchanged, indicating that the material has stable performance and broad application prospects for the purification of environmental pollutants .
研究领域:
材料科学
·
环境化学
·
催化化学
·
纳米科技
·
光化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 59
·34658-34670
·
IF 3.049
Xiangyu Wang,Yu Xie,Jun Ma,Ping Ning
The two-stage removal process of tetracycline (TC) in aqueous solutions using a novel photocatalyst based on nano-zero-valent iron (NZVI), g-C3N4 and expanded graphite by carbon layer (EGC) is reported for the first time. The composite (NZVI/g-C3N4@EGC) exhibits remarkable adsorption, reduction ability and visible light activity over the reaction course. Compared with pristine g-C3N4 (25.9%) and pure NZVI (45.9%), NZVI/g-C3N4@EGC achieves high degradation efficiency of TC (98.5%) due to the formation of a heterogeneous photo-Fenton system. This study shows that synergistic effects are achieved in the reaction system, including maintaining the reduction ability of NZVI and enhancing the photocatalytic activity of g-C3N4 by facilitating the separation of photogenerated electrons (e−) and holes (h+). TC removal involved a two-stage process of adsorption–reduction and photo-degradation. The quencher experiments determined that holes (h+) and superoxide radicals (˙O2−) are the major reactive species in the degradation of TC. The degradation pathways of TC were proposed based on the analysis of the intermediates. In addition, NZVI/g-C3N4@EGC revealed a high stability in a five-cycle test and good magnetic properties for facile separation from aqueous solutions. From an application viewpoint, NZVI/g-C3N4@EGC has favorable prospects in the direction of the photocatalytic degradation of antibiotic wastewater.
研究领域:
环境化学
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材料科学
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光催化
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水污染治理
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纳米复合材料
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抗生素降解
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yifan Zhang,Jie Shi,Xiaoqing Ding,Jiaojiao Wu,Yan-Zhen Zheng,Xia Tao
Unary-organic-cation lead halide perovskites like MAPbI3 have been emerging as tremendous photocatalysts for H2 evolution recently. However, their photocatalytic performances are inferior without modification. Here, a series of mixed-organic -cation perovskites MA1–xFAxPbI3 (M1–xFxPI, x = 0, 0.2, 0.3, 0.4, 0.5) were synthesized by introducing FA+ into MAPbI3 precursor and then composited with MoS2 as photocatalysts for H2 evolution reaction (HER). We demonstrate that the fabricated MoS2/M0.6F0.4PI is highly efficient and ultrastable during the photocatalytic HER process. The optimal MoS2/M0.6F0.4PI composite, i.e., 20 wt % MoS2/M0.6F0.4PI exhibits a visible HER rate of 2131 μmol h–1 g–1, increasing by 88-fold in comparison with pure MAPbI3 (24 μmol h–1 g–1) and better than the optimized Pt/M0.6F0.4PI (1328 μmol h–1 g–1). No activity degradation of 20 wt % MoS2/M0.6F0.4PI occurs in repeated HER experiments. The (photo)electrochemical performances of the composite are studied to reveal the photoinduced charge transfer and consequent HER process.
研究领域:
材料科学
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光催化
·
能源化学
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纳米材料
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半导体物理
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太阳能转化
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 39
·期 3
·1892-1898
·
IF 3.159
Xuehua Yin,Jin Cai,Hongyan Feng,Zeming Wu,Jianmei Zou,Qingyun Cai
A novel ultrasensitive sensing system for rapid fluorescence detection of cytochrome c (cyt c) was proposed by combining aptamer-based bioassay with VS2 nanosheets. VS2 nanosheets with high fluorescence quenching ability were synthesized by the solution route. A cyt c-binding aptamer was tagged with the fluorescent dye carboxy fluorescein (FAM), acting as the probe. VS2 nanosheets can adsorb the probe and quench its fluorescence efficiently. However, the fluorescence of the probe was retained when it was incubated with cyt c and then mixed with VS2 nanosheet solution. The proposed sensing system shows high selectivity and sensitivity, giving a linear range of 0.75 nM to 50 μM, and a limit of detection of 0.50 nM.
研究领域:
纳米技术
·
生物传感器
·
分析化学
·
生物分析化学
✓ 已验证
DOI
高影响因子
Materials Horizons
·
2023
·Vol. 10
·期 12
·5684-5693
·
IF 13.3
Panqin Wang,Jiaren Du,Tengyue Wang,Shaoxing Lyu,Rik Van Deun,Dirk Poelman,Hengwei Lin
Despite the substantial progress made, the responsiveness of thermo-responsive materials upon various thermal fields is still restricted to monochromatic visualization with single-wavelength light emission. This stems from a poor understanding of the photophysical processes within the materials and the unvarying optical performance of luminescent centers’ response to various ambient temperatures. Conventional techniques to assess the inhomogeneities of thermal fields can be time-consuming, require specialized equipment and suffer from inaccuracy due to the inevitable interference from background signals, especially at high temperature. To this end, we overcome these limitations for the first time, to flexibly visualize temperature inhomogeneities by developing a thermochromic smart material, SrGa12−xAlxO19:Dy3+. Two distinct modes of thermochromic properties (steady-state temperature-dependent luminescence and thermally stimulated luminescence) are investigated. It is revealed that the abundant colors (from yellow, green to red) and amazing color-changing features are due to the superior optical integration of the host (SrGa12−xAlxO19) and dopant (Dy3+) emissions under specific thermal stimulations. We suggest that this thermo-responsive smart material can be used to realize highly efficient and simple visualization of invisible thermal distribution in industry and beyond.
研究领域:
材料科学
·
光学工程
·
热物理学
·
功能材料
·
工业检测
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 7
·1902075
·
IF 4.948
Zhenyu Xu,Liang Hu,Jun Yuan,Yiyue Zhang,Yujie Guo,Zhengyuan Jin,Fangchao Long,Yaojia Long,Huawei Liang,Shuangchen Ruan,Yu-Jia Zeng
Fluorescence method for detecting metal ions has advantages of fast detection speed, simple operation, and low price over the conventional methods. Black phosphorus quantum dots (BP QDs) have high photoluminescence quantum yield and modifiable surface, which have great potential in the field of fluorescent probes. In this study, high quality BP QDs are prepared by pyrolysis method and are first time used as trace metal ion probes in both organic solutions and aqueous solutions. The detection limits of Hg 2+ and Cu 2+ in the aqueous solution are 5.3 × 10 −9 m and 1.6 × 10 −6 m , respectively. In addition, the detection limits of Cu 2+ in the organic solution are 16 × 10 −6 m . The fluorescence quenching mechanism based on the calculation of the electronic structure and adsorption energy of BP QDs after adsorption of metal ions is further explained. The results provide a new promising fluorescence probe for trace metal ions without the help of organic molecules.
研究领域:
分析化学
·
纳米生物技术
·
环境监测
·
分子探针
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Naizhang Xu,Bowei Cai,Qi Li,Yubing Liu,Jie Tang,Kaiqiang Wang,Bolian Xu,Yining Fan
The covalent triazine frameworks (CTFs) have recently become a new generation of organic semiconductor for photocatalytic hydrogen production from water splitting because of their great application potentials. However, the CTFs need to be combined with noble-metal-cocatalysts to achieve photocatalytic water splitting. Herein, we reported the noble-metal-free Ni 2 P/CTF composites as an efficient catalyst for photocatalytic hydrogen evolution . With increasing the Ni 2 P alloy loading on the surface of CTF, the photocatalytic activity increases obviously and then decreases gradually, and the highest photocatalytic H 2 evolution rate is achieved for 2.8%Ni 2 P/CTF, which is almost the same as that of 3.0%Pt/CTF photocatalyst. It has been revealed that the Ni 2 P alloy act as a cocatalyst for effectively suppressing the recombination of photogenerated electrons and holes, promoting the separation and migration of the charge carriers, thereby improving the efficiency of photocatalytic H 2 evolution. This work provides a promising strategy for preparation of cheap and stable photocatalytic system based on CTF for efficient photocatalytic hydrogen evolution under visible-light irradiation.
研究领域:
材料化学
·
光催化
·
能源化学
·
半导体物理
·
可持续能源
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Cong Fu,Lingfang Liu,Cici Wang,Weixin Huang,Guofeng Zhao
Unraveling the effect of defects on the concentration of surface-available photoexcited charges is of great importance for semiconductors in photocatalysis. Herein, by using in situ diffuse-reflectance infrared (IR) spectroscopy, the concentration of surface-available photoholes on TiO2 nanoparticles with tunable bulk/surface defects was quantified by an adsorbate (methanol) surface elementary reaction kinetic analysis method. Reaction kinetics showed that the oxidation of the adsorbed methanol species under light irradiation was a first-order reaction. Therefore, the concentration of surface-available photoholes can be calculated from the rate constants of adsorbed methanol on the TiO2 surface. By carefully comparing the specific reaction rate constants on the TiO2 surface with various bulk/surface defect ratios, we demonstrated for the first time that increasing the bulk defect concentration relative to the surface defects decreases the concentration of surface-available photoholes. This trend implicates different effects of bulk and surface defects on band bending and subsequent interfacial hole transfer processes in TiO2 nanoparticles. These insights not only reveal the mechanistic role of surface and bulk defects in photocatalysis but also highlight that in situ IR spectroscopy combined with reaction kinetic analysis has enormous potential in elucidating photocatalytic mechanisms.
研究领域:
光催化
·
材料化学
·
表面科学
·
物理化学
·
纳米材料
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 23
·12713-12721
·
IF 14.511
Yongming Hu,Zhi Liang Zhao,Rafia Ahmad,Moussab Harb,Luigi Cavallo,Luis Miguel Azofra,San Ping Jiang,Xinyi Zhang
Despite considerable progress in the field of sustainable ammonia technology, the low efficiency and yield have remained the main bottleneck in artificial nitrogen fixation under ambient conditions. In this work, an ultrathin carbon quantum dot modified hydrogenated mesoporous SrTiO3 heterostructure (CQDs/STO) has been developed as a bifunctional catalyst for enhanced nitrogen reduction. CQDs/STO exhibits a high photocatalytic activity and an ammonia yield of 143 μmol g−1 h−1 has been achieved without any sacrificial reagent, which is about 7 times that of STO nanoparticles. Furthermore, we demonstrate that CQDs/STO can be utilized as a bifunctional catalyst for cascade photoelectrochemical nitrogen reduction, resulting in a ∼50% increase in the ammonia yield. DFT calculations reveal that the synergy between SrTiO3 and CQDs has the capability for photocatalytic reduction of N2 with the O-vacancies in SrTiO3 playing a key role also as electrocatalytic centers. We believe that such a cascade catalytic system provides a new insight into designing photoelectrochemical devices for solar-driven nitrogen fixation.
研究领域:
材料科学
·
催化化学
·
能源化学
·
纳米科技
·
可持续能源
·
人工固氮
·
太阳能转化
✓ 已验证
DOI
高影响因子
ANALYST
·
2016
·Vol. 141
·期 10
·3041-3049
·
IF 4.033
Yan Xiong,Chengjie Wang,Tao Tao,Ming Duan,Jun Tan,Jiayi Wu,Dong Wang
Fluoride concentration is a key aspect of water quality and essential for human health. Too much or too little fluoride intake from water supplies is harmful to public health. In this study, a capillary waveguide integrated fiber-optic sensor was fabricated for fluoride measurement in water samples. The sensor was modularly designed with three parts, i.e., a light source, capillary flow cell and detector. When light propagated from a light emitting diode (LED) to the capillary waveguide cell through an excitation fiber, it interacted with the sensing reagent, and its intensity changed with different fluoride concentrations. Then, the light propagated to the detector through a detection fiber for absorption determination of fluoride according to Beer's law. This miniaturized sensor showed advantages of fast analysis (9.2 s) and small reagent demand (200 μL) per sample, and it also had a low detection limit (8 ppb) and high selectivity for fluoride determination. The sensor was applied to fluoride determination in different water samples. The results obtained were compared with those obtained by conventional spectrophotometry and ion chromatography, showing agreement and validating the sensor's potential application.
研究领域:
分析化学
·
环境监测
·
生物医学传感
·
水质安全
·
光学传感器
·
公共健康
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yu Zhang,Yong Wang,Maoyun Di,Boye Zhou,Wei Xu,Niandu Wu,Yizhang Wu,Youwei Du,Wei Zhong
Atomically thin 2D carbon nitride sheets (CNs) can improve the photocatalytic performance due to their high specific surface area, exposed active sites, and nano-scaled diffusion path of the charge transferred to surface. However, in practical application, 2D CNs photocatalysts always suffer the low solar absorption. Here, we present a novel approach to achieve the ultrathin 2D CNs photocatalysts with wide spectrum absorption in visible-light range. The new method, i.e. thermal annealing of atomically thin CNs in Se vapor, can dramatically extend the absorption edge of the ultrathin CNs from 418 to 574 nm. Using structural characterization and spin-polarized density functional theory, we identify the loss of the nitrogen atoms at the edges and in situ Se doping into the network of ultrathin CNs, which could change the electronic band structure of the 2D CNs. As a consequence, the ultrathin 2D CNs photocatalyst via Se vapor annealing (Se-CNs) modified by Pt cocatalyst shows a superior photocatalytic hydrogen evolution activity under visible light irradiation. More significantly, the ultrathin Se-CNs photocatalyst also exhibits an impressive photocatalytic hydrogen evolution activity under visible-light irradiation in the absence of Pt cocatalyst. We believe that our study provide a facile and environmentally friendly strategy to realize the utilization of 2D CNs photocatalyst under wide spectrum range of solar radiation to harvest solar energy efficiently, and it can be further applied in various advanced fields, including CO 2 photoreduction, organic photosynthesis, and pollutant controls.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
·
环境功能材料
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Xiaoxiang Wu,Yali Liu,Mengge Li,Wenxuan Guo,Tianjian Ou,Cong Xiao,Jiadong Yao,Ying Yu,Yuan Zheng,Yewu Wang
Photodetectors based on two-dimensional materials and their van der Waals (vdW) heterojunctions usually have excellent optoelectronic performance and great potential applications. Herein, gallium (Aladdin, particles, 99.999% trace metal basis), selenium (Aladdin, powder, 99.999% trace metal basis), and iodine (Alfa Aesar, 99.999% trace metal basis) are the raw materials for the growth of gallium selenide (GaSe) single crystals by the chemical vapor transport method, in which iodine is the transport agent. Subsequently, GaSe nanoflakes are exfoliated from the grown bulk GaSe crystals by mechanical exfoliation. The n-Si/p-GaSe van der Waals vertical heterojunctions have been designed and fabricated for photodetection, which show good characteristics including a high responsivity of 1.74 A/W and a fast response/recovery time of 48 μs/88 μs under zero bias owing to their type-II band structure and built-in electric field. The results indicate that n-Si/p-GaSe vdW vertical heterojunctions are promising candidates in future ultrafast optoelectronic devices.
研究领域:
光电子学
·
材料科学
·
纳米技术
·
半导体器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）