Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2022
·
IF 3.407
Lianqing Yu,Xingyu Zhao,Jiandong He,Lijie Duan,Yankun Wang,Yaping Zhang,Haifeng Zhu
It is extremely desirable to develop efficient and cheap water splitting photocatalysts. An ultrahigh performance and stable photocatalyst g-C 3 N 4 /Zn 0.5 Cd 0.5 S was prepared by simple sintering method. g-C 3 N 4 nanosheets are evenly distributed around 20–30 nm ZnCdS nanoparticles, which can accelerate carriers separation and transfer, and increase the carriers life-time from 4.1 ns to 5.5 ns. UV–vis absorption spectra demonstrate that their absorption range can reach to visible light edge of 539 nm. The photocatalyst has a high photocatalytic hydrogen evolution rate of 16.66 mmol•h −1 •g −1 under visible light illumination (λ = 400–780 nm). Furthermore, after six recycles of photocatalyst, the hydrogen evolution stability still remains 94%. The excellent photocatalytic performance is attributed to the Z-scheme energy band structure formed between g-C 3 N 4 and Zn 0.5 Cd 0.5 S by simple sintering method. This work provides significant progress toward the synthesis of cheap Z-scheme photocatalysts for practical applications.
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高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Chun Yang,Xiao Liu,Jun Liu,Guangli Li,Lixia Xie,Xiaohui Shi,Yukun Zhao,Lan Long,Dongge Ma,Jianxin Tang,Wanhong Ma
Conventional photocatalysts generate numerous active species—primarily hydroxyl radicals (•OH)—under solar light excitation to exert photocatalytic activity for especially antibacterial effects. However, the light dependence limits their competitiveness against other antimicrobial materials since they do not work at night. Herein, a P-g-C 3 N 4 /Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (P-g-C 3 N 4 /SMSO) composite day–night photocatalyst is synthesized, using a model methyl orange (MO) substrate, and the impacts of trace P doping and the SMSO composite on the activity of the photocatalyst in MO degradation is investigated; Its antibacterial effect against Escherichia coli and Staphylococcus aureus on ceramic surfaces is further examined. The morphology, structure, and composition of the photocatalyst are characterized by SEM, TEM, XRD, FT-IR, and UV–vis DRS. Finally, the photocatalytic mechanism is elucidated through active species capture experiments and ESR testing. P doping and the SMSO heterojunction structure reduce the width of the forbidden band of g-C 3 N 4 and broaden its visible-light-response range. Moreover, SMSO acts as a light source to realize long-lasting photocatalytic performance of the composite, even in the dark. The photocatalytic process produces •O 2 - , 1 O 2 , and h + active species, with •O 2 - and 1 O 2 playing the dominant role—instead of •OH as previously thought.
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PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Mingyu Cui,Chong Liang,Wei Zhao,Xutang Liu,Linyang Dong,Dingkai Wang,Shuiyuan Fu,Zhijie Jiang,Fei Wang,Xianyong Wei
As the most abundant resource composed of aromatic groups in nature, lignin harbors significant potential for the production of bio-based fuels and chemicals. In recent years, solar-driven photocatalysis with its mild, low cost and environmental benign, has been employed for lignin depolymerization . Herein, we designed a Z -scheme CdS/H 5 PMo 10 V 2 O 40 /g-C 3 N 4 (CdS/HPA-2/CN) photocatalyst via hydrothermal method for the photocatalytic depolymerization of lignin. The prepared CdS/HPA-2/CN presents a nanoflower-like morphology with the average diameter of ∼600 nm. With the presence of electron-mediated HPA-2, CdS/HPA-2/CN exhibits the enhanced separation and transfer capacity of photogenerated charge carriers through Z -scheme mechanism. Result shows that the total yield ( Y ) of vanillin and vanillic acid from lignin depolymerization over optimized CdS/HPA-2/CN can reach to 32.7 mg/g lignin in DMF/formic acid ( v / v = 40/10) for 4 h. Reusability experiment of optimized CdS/HPA-2/CN displays that Y (26.5 mg/g lignin) can still reach to 81.0% of initial one after three cycles. Qualitative analysis of depolymerized products reveals that most components are aromatic compounds with the dominant products of vanillin and vanillic acid. Evidence also shows that photocatalysis promotes the reaction and small molecular products increased significantly after depolymerization. In addition, mechanism experiments and electron spin resonance tests exhibit that h + , ·O 2 − and ·OH took part in lignin depolymerization together and the effect sequence was ·O 2 − > ·OH > h + . In this work, as an electron mediator, HPA-2 provides the inspiration for construction of Z -scheme heterojunction , and CdS/HPA-2/CN exhibits enormous potential in lignin depolymerization by photocatalysis.
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高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 15
·4817-4825
·
IF 6.177
Shilin Kang,Zhijun Li,Zhikun Xu,Ziqing Zhang,Jianhui Sun,Ji Bian,Linlu Bai,Yang Qu,Liqiang Jing
Although g-C3N4-based heterojunctions show promise for photocatalytic CO2 reduction, enhancing charge separation and creating sufficient catalytic sites remain challenges. In this study, mixed-valence CuPc/graphene/g-C3N4 (HT-CuPc/G/UCN) ultrathin heterojunctions (∼4.8 nm thickness) with Cu1+/Cu2+ species were constructed by H-bond induced assembly and subsequent post-treatment with H2. The optimized H100-CuPc/G/UCN sample showed 36-times higher activity than bare ultrathin g-C3N4 (UCN) for photocatalytic CO2 reduction to CO. Based on atomic force microscopy images, normalized photocurrent action spectra, electron paramagnetic resonances, and in situ diffuse reflectance infrared Fourier transform spectra, it was confirmed that the unexpected photocatalytic activity of H100-CuPc/G/UCN was attributed to the dual-functional roles of the introduced graphene: to increase the optimized amount of CuPc and enhance the high-level-energy electrons transferring from UCN to CuPc and the created Cu1+/Cu2+ species by H2 reduction as active catalytic sites for CO2 reduction. This work provides a comprehensively feasible strategy for preparing rational heterojunctions toward high-efficiency solar-driven CO2 reduction.
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高影响因子
Frontiers in Energy
·
2020
·Vol. 14
·期 4
·759-766
·
IF 2.657
Bian Zhengxu,Tang Zehua,Xie Jinfeng,Zhang Junhao,Guo Xingmei,Liu Yuanjun,Yuan Aihua,Zhang Feng,Kong Qinghong
As the anode material of lithium-ion battery, silicon-based materials have a high theoretical capacity, but their volume changes greatly in the charging and discharging process. To ameliorate the volume expansion issue of silicon-based anode materials, g-C 3 N 4 /Si nanocomposites are prepared by using the magnesium thermal reduction technique. It is well known that g-C 3 N 4 /Si nanocomposites can not only improve the electronic transmission ability, but also ameliorate the physical properties of the material for adapting the stress and strain caused by the volume expansion of silicon in the lithiation and delithiation process. When g-C 3 N 4 /Si electrode is evaluated, the initial discharge capacity of g-C 3 N 4 /Si nanocomposites is as high as 1033.3 mAh/g at 0.1 A/g, and its reversible capacity is maintained at 548 mAh/g after 400 cycles. Meanwhile, the improved rate capability is achieved with a relatively high reversible specific capacity of 218 mAh/g at 2.0 A/g. The superior lithium storage performances benefit from the unique g-C 3 N 4 /Si nanostructure, which improves electroconductivity, reduces volume expansion, and accelerates lithium-ion transmission compared to pure silicon.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Herein, TiO 2 /g-C 3 N 4 /Ag (TCA) composites were successfully fabricated by a simple two-step method and wet chemical reduction. Titanium isopropoxide and melamine were used as precursors to prepare TiO 2 /g-C 3 N 4 heterojunction composites by simple stirring and calcining. Then, different mass fractions of AgNPs were decorated on the surface of the above composites by wet chemical reduction to obtain a sequence of TiO 2 /g-C 3 N 4 /Ag (TCA) composites. TCA composites were analyzed by XRD, TEM, HRTEM, EDS, XPS, BET, Raman spectroscopy, PL spectrum and UV–vis diffuse reflectance spectrum. The results showed that TCA composites had remarkable enhancement in the separation of photogenerated carriers and the utilization of light, which was as result of the coordination of the three components. For photodegradation of RhB or phenol under simulated sunlight, TCA-1 samples revealed the best photocatalytic degradation performance, and the corresponding degradation rates were 91.4% at 60 min and 90.0% at 120 min, respectively. Moreover, TCA-1 composites maintained superior degradation performance after reusability tests, indicating that TCA-1 composites had excellent photochemical stability. For experimental results, a possible photodegradation mechanism of TCA composites was also proposed.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yanbin Wang,Xu Zhao,Di Cao,Yan Wang,Yongfa Zhu
Single-atom dispersed Ag modified mesoporous graphitic carbon nitride (Ag/mpg-C 3 N 4 ) hybrid was synthesized by co-condensation method and employed as a visible light photocatalyst. In the presence of peroxymonosulfate (PMS), Ag/mpg-C 3 N 4 showed excellent performance for the degradation of bisphenol A (BPA). 100% BPA and 80% TOC could be removed with 0.1 g/L catalyst and 1 mM PMS under visible light (λ > 400 nm) within 60 min. The reason for the enhanced performance is possibly due to the synergistic effect of single-atom Ag and mpg-C 3 N 4 . On the one hand, more visible light could be captured with the introduction of Ag; on the other hand, the existence of PMS promotes the separation efficiency of photogenerated electron-hole pairs. Electron spin resonance (ESR) and free radicals quenching experiment suggest that the major reactive oxygen species (ROS) are sulfate radical (SO 4 − ), superoxide radicals (O 2 − ) and photogenerated holes, while the role of hydroxyl radicals ( OH) is insignificant in this process. The findings of this work highlighted the great potential of g-C 3 N 4 as photocatalysts and elucidated a new opportunity for PMS remediation of contaminated water.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Jing Liu,Jie Li,Sen He,Lei Sun,Xiangjuan Yuan,Dongsheng Xia
Various amounts of copper oxide (CuO) modified graphitic carbon nitride (g-C 3 N 4 ) denoted as CuO-CN x composites were successfully fabricated via a reflux condensation method and used as efficient ozonation catalysts for oxalic acid (OA) degradation in aqueous solution. The BET, FT-IR, HRSEM, TEM, XPS, etc. characterizations revealed the chemical composition, bond structure and morphologies of as-prepared CuO-CN x composites. The results indicated that the introduction of CuO into g-C 3 N 4 relying on the chemical interaction rather than simple physical mixture. Moreover, the increased active sites and the intense chemical bonds could play important roles in improving the catalytic ozonation performances of CuO-CN x composites. In this study, the practical applications of catalysts at different conditions were also investigated. When the mass ratio of CuO/g-C 3 N 4 was 10, the CuO-CN 10 composite exhibited superior catalytic ozonation activity with 97.9% OA removal efficiency after 30 min at pH 5.0. Meanwhile, the CuO-CN 10 showed excellent stability and reusability for contaminant degradation during multiple consecutive cycles. Furthermore, hydroxyl radical and superoxide radical as the major reactive radicals were identified and the catalytic mechanism for OA degradation improvement was also elucidated. Overall, this work would provide an efficient and eco-friendly catalyst for water treatment as well as a new idea for future environmental purification.
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高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 10
·842
·
IF 3.504
Hui Liu,Zhi-Guang Zhang,Hong-Wei He,Xiao-Xiong Wang,Jun Zhang,Qian-Qian Zhang,Yan-Fu Tong,Hong-Ling Liu,Seeram Ramakrishna,Shi-Ying Yan,Yun-Ze Long
To meet the urgent need of society for advanced photocatalytic materials, novel visible light driven heterostructured composite was constructed based on graphitic carbon nitride (g-C3N4) and fibrous TiO2. The g-C3N4/TiO2(CNT) composite was prepared through electrospinning technology and followed calcination process. The state of the g-C3N4and fibrous TiO2was tightly coupled. The photocatalytic performance was measured by degrading the Rhodamine B. Compared to commercial TiO2(P25®) and electrospun TiO2nanofibers, the photocatalytic performance of CNT composite was higher than them. The formation of CNT heterostructures and the enlarged specific surface area enhanced the photocatalytic performance, suppressing the recombination rate of photogenerated carriers while broadening the absorption range of light spectrum. Our studies have demonstrated that heterostructured CNT composite with an appropriate proportion can rational use of visible light and can significantly promote the photogenerated charges transferred at the contact interface between g-C3N4and TiO2.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·9324-9331
·
IF 3.201
Jie Li,Saisai Cheng,Tianxing Du,Ningzhao Shang,Shutao Gao,Cheng Feng,Chun Wang,Zhi Wang
In this work, a porous g-C3N4 nanosheets/reduced graphene oxide (rGO) composite was synthesized via the hydrothermal co-assembly of GO and g-C3N4 nanosheets (g-C3N4 NS). Compared with g-C3N4 NS, rGO and bulk g-C3N4/rGO, the g-C3N4 NS/rGO supported Pd nanocatalyst displayed a remarkable catalytic activity for the hydrogenation of alkenes with formic acid and formates as the hydrogen source at atmospheric pressure. Among all the as-prepared Pd-g-C3N4 NS/rGO catalysts, the optimized Pd-g-C3N4 NS/rGO20 exhibited the highest turnover frequency of 133 mol mol−1 Pd h−1, which is among the highest value reported in documents. 99% conversion and 99% selectivity were achieved after 30 min reaction at 30 °C for the hydrogenation of nitrobenzene. In addition, Pd-g-C3N4 NS/rGO20 exhibited an excellently high stability after five successive cycles without significant loss of its catalytic activity.
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Yang Li,Yuyu Bu,Fengqiu Jiang,Xianying Dai,Jin-Ping Ao
In this work, we fabricate a novel bismuth vanadate/two dimensional-carbon nitride/deoxyribonucleic acid (BiVO 4 /2D-C 3 N 4 /DNA) aptamer photoelectrochemical (PEC) sensor, and this sensor provides a record detection sensitivity area (5 × 10 −7 μg/L - 10 μg/L) for Microcystin-LR (MC-LR). Meanwhile, except for MC-LR detection, this sensor presents highly sensitivity for tumor marker, heavy metal ion , antibiotic also by changing the DNA aptamer. Photo charge dynamic and theory calculation results reveal that 2D-C 3 N 4 is a key material for multifunctional interface reconciliation of this PEC aptamer sensor. Firstly, it can serve as photogenerated hole oriented-transfer medium from the BiVO 4 photoanode to the detective target; In addition, 2D-C 3 N 4 with large area of π electron cloud can fix the DNA aptamer parallelly by π-π bonding with the nucleic acid in the DNA aptamer to shorten the hole transfer distance from the semiconductor to target. So that, a record MC-LR detection sensitivity has been achieved by the 2D-C 3 N 4 modified BiVO 4 /DNA aptamer sensor.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Jun Zhang,Wei Zuo,Lingchao Kong,Hao Cui
In this study, a newly-designed Z-scheme g-C 3 N 4 @ZnO heterostructure was synthesized by 3D ZnO controllable deposition on 2D g-C 3 N 4 nanosheets using thermal atomic layer deposition. The activity of 2D/3D g-C 3 N 4 @ZnO was evaluated by photocatalytic degradation of cephalexin under simulated sunlight. Results showed that the g-C 3 N 4 @ZnO photocatalyst achieved 98.9% degradation and 72.8% mineralization of cephalexin within 60 min of illumination. This degradation process fitted to the pseudo first order dynamic model with reaction rate constant of 0.0735 min −1 , 5.4 and 8.1 times higher than that of pure g-C 3 N 4 and ZnO, respectively. Consecutive degradation experiments revealed the excellent stability and recyclability of 2D/3D g-C 3 N 4 @ZnO photocatalyst. Mechanism exploration found the enhanced photocatalytic activity was mainly ascribed to the strong oxidizability of active species generated on Z-scheme g-C 3 N 4 @ZnO. Besides, the oxidative species, especially h + and · OH played significant roles in the degradation process. Moreover, the degradation intermediates were identified through HPLC/MS/MS analysis and the possible pathway of cephalexin decomposition was proposed accordingly. The Z-scheme 2D/3D g-C 3 N 4 @ZnO was also proved effective for contaminants removal in real sewage. This study provided a new platform for controllable creation of Z-scheme photocatalysts with broad application prospects in contaminants remediation from aquatic environment under solar light.
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高影响因子
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