APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Juan Wang,Guohong Wang,Xianhong Wei,Guo Liu,Jun Li
A ZnO/TiO 2 heterojunction photocatalyst based on ZnO nanoparticles embedded in the hierarchically structured TiO 2 framework containing parallel macroporous channels and thin mesoporous walls has been synthesized by a common calcination treatment using zinc chloride and tetrabutyl titanate as the raw materials. The materials properties of the ZnO/TiO 2 heterojunction photocatalysts have been carefully characterized with SEM/TEM, XRD, FTIR, XPS, BET analyses, UV–Vis absorption and photoluminescence spectroscopy. The photocatalytic performance for decomposition of Rhodamine B (RhB) under UV light irradiation has been systematically investigated in correlation with the materials structures. The apparent RhB degradation rate constant ( k ) has been determined to be 20.7 × 10 −3 min −1 for the optimal hybrid photocatalyst with 5 wt% of ZnO loading, significantly higher that of pure TiO 2 (12.2 × 10 −3 min −1 ) and pure ZnO nanoparticles (5.7 × 10 −3 min −1 ), respectively. Active species trapping experiments reveal that •OH and •O 2 − play the major roles in the photocatalytic reactions. The enhanced performance can be ascribed to the formation of a direct Z-scheme heterojunction structure between ZnO and TiO 2 in contrast to the usual type-II heterojunction.
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
Polymers
·
2022
·Vol. 14
·期 24
·5483
·
IF 4.967
Changqing Yang,Chenghai Ma,Duoping Zhang,Zhiang Luo,Meitong Zhu,Binhao Li,Yuanyuan Zhang,Jiawei Wang
In this study, a novel direct Z-scheme SnS2quantum dots/sulfur-doped polyimide (SQDs/SPI) photocatalyst was firstly fabricated by an in situ crystallization growth of SnS2quantum dots on sulfur-doped polyimide through a facile hydrothermal method. The photocatalytic hydrogen production activity of 5SQDs/SPI samples reached 3526 μmoL g−1in the coexistence of triethanolamine and methanol used as hole sacrificial agents, which is about 13 times higher than that of SPI under the same conditions and 42 times higher than that of SPI only as a hole sacrificial agent. The improvement can be related to the direct Z-scheme charge transfer in the tight interface between SQDs and SPI, which promoted rapid separation and significantly prolonged the lifetime of photoexcited carriers. The Z-scheme charge transfer mechanism was proposed. This discovery comes up with a new strategy for the development of an efficient, environmentally friendly, and sustainable sulfide quantum dots/polymer non-noble metal photocatalyst.
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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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
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IF 5.774
Haochuan Jing,Ruipeng Ou,Hongbin Yu,Yahui Zhao,Ying Lu,Mingxin Huo,Hongliang Huo,Xianze Wang
The emergence of antibiotics in surrounding environment has aroused serious concerns. In this work, a direct Z-scheme heterojunction was constructed by integrating g-C 3 N 4 nanoparticles (g-C 3 N 4 NP) with WO 3 hollow microsphere composed of nanosheets (WO 3 NHMs) and developed as highly efficient photocatalyst for tetracycline hydrochloride (TC) removal. The hierarchical structure of WO 3 NHMs not only enhanced the optical absorption of catalyst by multiple reflecting and scattering of photons, but also promoted the adsorption of reactant molecules owing to the high surface area generated from the self-assembly interconnected nanosheets. The close contact between the interfaces of g-C 3 N 4 NP and WO 3 NHMs led to effective charge separation and transfer, and the optimized Z-scheme architecture preserved the oxidation and reduction capacity of each component to the greatest extent. After optimizing the component ratio, the corresponding g-C 3 N 4 NP/WO 3 NHMs hybrid delivered a significantly prominent photocatalysis towards TC degradation, whose kinetic constant was 2.42 times as high as that of bulk g-C 3 N 4 , and 6.88 folds as great as that of pristine WO 3 NHMs. As far as we know, this is the first report of integrating C 3 N 4 NP with WO 3 NHMs to enhance TC photodegradation through the synergistic effect of light absorption, quantum efficiency and adjusted surface characteristics. The active species capture experiments testified that h + and OH originated from the reaction of electrons with oxygen played important roles in the photocatalytic process. Under the attack of reactive oxygen species, TC underwent demethylation, deacylation, and ring-opening processes, and ultimately mineralized into CO 2 and H 2 O. This research can open up a new way to develop photocatalysts with high TC removal efficiency through reasonable structural configuration.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yuhang Ren,Yu Tian,Yating Lu,Dongyu Nie,Huayi Zhu,Xia Yang
Malathion (MA) is a widely used organophosphorus pesticide globally. Developing efficient photocatalysts is crucial for eliminating MA pollution in water by photocatalytic technology. This study focuses on preparing a series of H-PDI supermolecule/NH 2 -MIL-101(Fe) (PM) materials by amidating NH 2 -MIL-101(Fe) with the more stable H-PDI supermolecule, forming a covalent O C–NH bond. Among these materials, 40 %PM (indicating a mass percentage content of 40 % H-PDI supermolecule in PM) exhibited the best performance for degradation of MA. Under simulated sunlight irradiation of a 10 mg·L 1 MA solution for 180 min, the reaction rate constants of 40 %PM were 5.95 times and 3.13 times higher than those of NH 2 -MIL-101(Fe) and H-PDI supermolecule, respectively. The enhanced performance is attributed to the formation of Z-scheme heterojunctions in the 40 %PM composite lead to fast separation of photogenerated e − and h + . Combining the results of HPLC-MS with Fukui Function, the HOMO, LUMO, and pathway of degradation of MA attracted by 1 O 2 , •OH, and h + were speculated. The pathway involves oxidation, demethylation, P-S bond breakage, decarboxylation, and final conversion to some inorganic molecules. The toxicity of the degradation byproducts were lower than that of MA estimated by Toxicity Estimation Software Tool.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Baolai Wang,Kaili Wei,Fuming Chen,Yinzhen Wang,Guannan He,Wei Li,Junming Liu,Qinyu He
It has been found it more difficult in completely degrading A-ring of tetracycline (TC) than completely degrading B-D rings of tetracycline. Thus, it is very necessary to find an effective route to completely degrading A-ring of tetracycline. In this work, a Z-scheme heterojuncted core-shell La(OH) 3 @BaTiO 3 composite (LB) was designed and fabricated through hydrothermal method . Many characterization techniques were employed to investigate the microstructure, phases, composition, energy band structure , and the lifetime of photogenerated carriers. In the mean time, the photocatalytic properties, including the degradation of A-ring and B-D rings of TC, as well as active species during photo-degradation were investigated. It is found that the as-prepared LB has an improved lifetime of photo-produced carriers, as well as high photocatalytic properties, being attributed to the core-shell structured heterojunction La(OH) 3 @BaTiO 3 . In addition, it is also found that ·O 2 − is more effective on degrading A-ring of TC than other active species, likely owed to the PKa3 value (3.3) of A-ring in TC. This work has supplied a route to completely degrading the A-ring of TC: rationally design and prepare a Z-scheme heterojuncted composites which supply very negative conduction band bottom potential.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Haomiao Cao,Zhaoyi Yin,Xiaoyi Dong,Yongjin Li,Yong Yang,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
Exploring strategies to improve the near-infrared response of photocatalysts is an urgent challenge that can be overcome by utilizing upconversion (UC) luminescence to enhance photocatalysis. This paper reports the fabrication of a ZnO/Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (ZnO/BTOFYE) Z-scheme heterojunction based on a Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (BTOFYE) UC photocatalyst via electrostatic self-assembly. Fermi energy difference at the interface of BTOFYE and ZnO generates a strong internal electric field (IEF) in the Z-scheme heterojunction, offering a novel charge transfer mode that promotes carrier transfer and separation while retaining the strong redox capability. These results are confirmed through in situ X-ray photoelectron spectroscopy, in situ Kelvin probe force microscopy, electron spin resonance, and density functional theory calculations. In addition, the effect of the IEF on the UC luminescence process of Er 3+ enhances the luminescence intensity, considerably improving the UC utilization efficiency. The optimal ZnO/BTOFYE degrades 64 % of ciprofloxacin in 120 min, which is 2.3 times more than that degraded by BTOFYE. Overall, the results of this study offer a reference for the rational development of high efficiency UC photocatalysts by generating IEF in Z-scheme heterojunctions.
研究领域:
材料科学
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光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
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IF 6.9
Xueying Wang,Xinyu Wang,Hefan Zhang,Jiqiao Zhang,Zhida Li,Xin Wang,Jianming Xu,Delu Cao,Jintao Li,Changyu Lu
The photothermal effect generated under illumination can increase the surface temperature of the catalyst, and enhance the migration rate of the photogenerated carrier and the activity of the catalytic reaction , which is an effective way to promote photocatalytic degradation of pollutants. In this study, a Z-scheme BiVO 4 /CuBi 2 O 4 (BVO-CBO) heterojunction with 0D/1D structure was prepared by hydrothermal method . Compared with pure BVO and CBO, the temperature of the Z-scheme BVO-CBO heterojunction can reach 90.1°C after 180 S illumination, and the temperature of the BVO-CBO+TC solution system can rise to 39.5°C after 10 min, which has higher heating rate and photocatalytic performance than the monomer catalyst. The experimental results showed that the photogenerated electron transfer pathway combined with the photothermal effect effectively promoted the separation of photogenerated carriers and maintained a strong redox potential , so that the removal rate of tetracycline (TC) by BVO-CBO reached 85.0 % within 90 minutes, which was significantly higher than that of pure BVO (39 %) and CBO (33 %). In addition, the toxicity of intermediate products gradually decreased during TC degradation. In addition, the effects of reaction temperature, pH, concentration of TC, common aquatic substrates and simulated natural water on TC removal were also studied. The combination of its structural advantages, redox capabilities, and photothermal effect provided a promising approach to the treatment of antibiotic-contaminated water.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 22
·5418
·
IF 4.2
Shuo Yang,Tianna Wu,Kaiyue Li,Ping Huang,Wenhui Li,Yuquan Zhuo,Keyan Liu,Ziwen Yang,Donglai Han
With the intensification of the energy crisis and the growing concern over environmental pollution, particularly the discharge of organic dye pollutants in industrial wastewater, photocatalytic degradation of these contaminants using solar energy has emerged as an effective, eco-friendly solution. In this study, we successfully synthesized 2D/2D g-C3N4/BiOI p-n heterojunctions via a simple precipitation method and a high-temperature calcination method. The unique 2D structures of g-C3N4nanosheets (NSs) and BiOI NSs, coupled with the synergistic effect between the two materials, significantly enhanced the photocatalytic degradation performance of the heterojunctions under simulated sunlight. The band structures, as determined by Tauc curves, Mott–Schottky curves and XPS-VB analysis, revealed a Z-scheme charge transfer mechanism that efficiently reduced charge carrier recombination and improved electron–hole separation. The photocatalytic activity of 2D/2D g-C3N4/BiOI p-n heterojunctions for rhodamine B (Rh B) degradation reached 99.7% efficiency within 60 min, a 2.37-fold and 1.27-fold improvement over pristine BiOI NSs and g-C3N4NSs, respectively. Furthermore, the heterojunction exhibited excellent recyclability stability, with the degradation efficiency decreasing by only 1.2% after five cycles. Radical scavenging experiments confirmed the involvement of superoxide radicals (∙O2−) and hydroxyl radicals (∙OH) as the primary reactive species in the degradation process. This work highlights the potential of 2D/2D g-C3N4/BiOI p-n heterojunctions for efficient photocatalytic applications in environmental remediation.
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
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Cuiwei Du,Shiyu Nie,Can Zhang,Tian Wang,Shizhan Wang,Jing Zhang,Chongfei Yu,Zhansheng Lu,Shuying Dong,Jinglan Feng,Haijin Liu,Jianhui Sun
The major challenges of clean energy and environmental pollution have resulted in the development of photocatalysis technologies for energy conversion and the degradation of refractory pollutants. Herein, a novel CdSe/Se/BiOBr hydrangea-like photocatalyst was used to produce hydrogen peroxide (H 2 O 2 ) and degrade ciprofloxacin (CIP). The Z-scheme heterojunction structure of the photocatalyst and the doping of selenium (Se) led to the efficient separation of electron-hole pairs and charge transfer. The optimized sample of 2 wt% CdSe/Se/BiOBr produced 142.15 mg·L −1 rate of H 2 O 2 , which was much higher than that produced by pure BiOBr (89.4 mg·L −1 ) or CdSe/Se (10.9 mg·L −1 ). Additionally, almost 100 % of CIP was degraded within 30 min, with a first order rate constant of nearly 5.35 times that of pure BiOBr and 81.44 times that of pure CdSe/Se. The excellent removal efficiency of CIP from natural water matrices confirmed that the composites are promising for the removal of contaminants from natural waterways. Based on trapping experiments, electron spin resonance spectra (ESR) spectroscopy, and density functional theory (DFT) calculations, the photocatalytic mechanisms of H 2 O 2 and CIP degradation by the Z-scheme CdSe/Se/BiOBr composites were proposed. Overall, the dual-functional CdSe/Se/BiOBr composite could potentially be applied for photocatalytic production of H 2 O 2 and treatment of organic pollutants in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Zhengdong Zhang,Xingyu Chen,Shanhua Chen,Qi Dong,Xinyi Zhang,Ao Jiang,Dafu Zhang,Yuli Di,Taishan Li
A Z-scheme TiO 2 /g-C 3 N 4 heterostructure system was used to activate peroxymonosulfate (PMS) for the photocatalytic degradation of Rhodamine B (RhB). The Z-scheme TiO 2 /g-C 3 N 4 heterojunction photocatalysts were successfully synthesized by using a simple impregnation method. The structure and surface morphology of the samples were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), X-Ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The optical and electrochemical properties were characterized by UV–vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) electrochemical impedance spectroscopy (EIS).The results indicated that the Z-scheme heterojunction between TiO 2 and g-C 3 N 4 was successful established and the optimal photocatalytic activity was achieved when the mass ratio of TiO 2 to g-C 3 N 4 is 10:1. The degradation rate of RhB (20 mg/L, 50 mL) was 82.79% within 120 min simulated sunlight irradiation. After adding PMS to 10% TiO 2 /g-C 3 N 4 heterojunction photocatalysts , the reaction rate constant (k) of the TiO 2 /g-C 3 N 4 -PMS system is about 11.39 times as large as that with 10% TiO 2 /g-C 3 N 4 system. Moreover, the free radical trapping experiments results demonstrated that h + and SO 4 − · were the main active species in the TiO 2 /g-C 3 N 4 -PMS system.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Mei Su,Yulu Chen,Linqi Wang,Zihao Zhao,Honggang Sun,Guoli Zhou,Pan Li
In our study, a series of WO 3 /Bi 2 MoO 6 heterostructured photocatalysts consisting of Bi 2 MoO 6 nanosheets and WO 3 nanorods were synthesized. Due to the Bi 2 MoO 6 nanosheets with two-dimensional structure, the as-prepared WO 3 /Bi 2 MoO 6 heterostructures had abundant oxygen vacancy defects and high exposure of active Bi 2 MoO 6 (010) facets. Compared with the pure Bi 2 MoO 6 and the oxygen vacancy-poor WO 3 /Bi 2 MoO 6 sample, the WO 3 /Bi 2 MoO 6 heterostructure with WO 3 weight ratios of 6 wt% (denoted as WO/BMO(6)) displayed improved photocatalytic activities in degradation of RhB and OTC under visible-light irradiation. The photoluminescence spectra, photoelectrochemical measurements and DOS analysis illustrated that the desirable photocatalytic performance of the WO/BMO(6) composite was attributed to the synergistic effect of heterojunction interface and oxygen vacancy defects on the efficient charge separation and transfer. Based on the trapping experiments, a Z-scheme charge transfer mechanism was proposed for the WO 3 /Bi 2 MoO 6 heterostructure.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
npj Parkinsons Disease
·
2025
·Vol. 11
·期 1
·1-10
·
IF 8.2
Lei Li,Chen Xiuli,Long Xincheng,Tu Qiuxia,Zhao Liping,Huang Dan,Song Lingli,Wang Jiaojiao,Zhai Suzhen,Chen Xiaozhong,Zhang Chunlin
Inspired by natural enzymes, artificial enzymes have garnered significant interest due to their simplicity of production, robustness under harsh conditions, and enhanced stability. This study introduces, for the first time, a novel Z/Ce@hemin composite enzyme, constructed by anchoring hemin onto zeolitic imidazolate framework-8 (ZIF-8)-encapsulated ceria (CeO 2 ) nanoparticles. This innovative design overcomes the challenges of hemin dimerization, enhances substrate affinity, and accelerates mass transport, leading to significantly improved peroxidase-like activity. The enzyme also demonstrates remarkable stability and resistance to environmental interference. Utilizing this Z/Ce@hemin composite, a sensitive and selective colorimetric detection system was developed for rapid and accurate quantification of hydrogen peroxide (H 2 O 2 ), a key oxidative stress marker. This approach was successfully applied in cellular models and Caenorhabditis elegans models of Parkinson’s disease, enabling precise monitoring of H 2 O 2 . The study provides a groundbreaking platform for oxidative stress modeling and expands possibilities in neurodegenerative disease research and therapeutic screening.
研究领域:
生物化学
·
医学
·
神经科学
✓ 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）