Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·2995-3004
·
IF 10.733
Peng Wen,Kefei Zhao,Hui Li,Jiangsheng Li,Jing Li,Qing Ma,Scott M. Geyer,Lin Jiang,Yejun Qiu
Very recently, transition metal phosphides (TMPs) have emerged as low-cost and robust co-catalysts for decorating graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen (H2) evolution. However, to date, little work has been done regarding the decoration approaches to hybridize TMPs on the g-C3N4 surface with homogeneous dispersion and intimate interfacial contact. Herein, we present a facile and convenient route to in situ incorporate g-C3N4 nanosheets (NSs) and Ni2P nanocrystal (NC) co-catalysts via a one-step co-heating solution approach. The Ni2P/g-C3N4 (in situ) hybrid photocatalyst achieved a far superior H2 production rate (2849.5 μmol g−1 h−1) and durability (no decrease after 4 cycles of reaction within 20 h) compared to the Ni2P/g-C3N4 (self-assembly) sample. The apparent quantum yield (AQY) of 18.8% at 420 nm was also much higher than that of other TMP co-catalyst loaded g-C3N4 hybrid photocatalysts. A possible Ni(δ+)–N(δ−) chemical coupling in the Ni2P/g-C3N4 (in situ) hybrid composite was proposed and corroborated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy. The unique Ni(δ+)–N(δ−) chemical bonding states between g-C3N4 and Ni2P significantly accelerate the photo-generated charge-carrier separation and extraction from g-C3N4, as well as maintaining the H2 production durability. We believe that the hybridization route presented in this work will be extended to construct other TMP integrated photocatalysts toward efficient and stable solar water splitting.
研究领域:
材料科学
·
能源化学
·
表面化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 12
·1-11
·
IF 5.833
Wang Xiao,Liao Xiaochen,Zhang Bingjian,Zhang Mengmeng,Mei Lisha,Wang Fangwai,Chen Siyu,Qiao Xiuwen,Hong Chenglin
Abstract Carcinoembryonic antigen levels in the human body reflect the conditions associated with a variety of tumors and can be used for the identification, development, monitoring, and prognosis of lung cancer, colorectal cancer, and breast cancer. In this study, an amperometric immunosensor with CuCo/carbon nanocubes (CuCo/CNC) as the signal label is constructed. The bimetal-doped carbon skeleton structure has a high specific surface area and exhibits good electrocatalytic activity. In addition, Au/g-C 3 N 4 nanosheets (Au/g-C 3 N 4 NSs) are used to modify the substrate platform, facilitating the loading of more capture antibodies. The reaction mechanism was explored through electrochemical methods, X-ray powder diffraction, X-ray photoelectron spectroscopy, and other methods. Kinetic studies have shown that CuCo/CNC have good peroxidase-like activity. In addition, the electrocatalytic reduction ability of CuCo/CNC on hydrogen peroxide can be monitored using amperometric i – t curve (− 0.2 V, vs. SCE), and the response current value is positively correlated with the CEA antigen concentration. The prepared electrochemical immunosensor has good selectivity, precision, and stability. The dynamic range of the sensor was 0.0001–80 ng/mL, and the detection limit was 0.031 pg/mL. In addition, the recovery and relative standard deviation in real serum samples were 97.7–103 % and 3.25–4.13 %, respectively. The results show that the sensor has good analytical capabilities and can provide a new method for the clinical monitoring of CEA. Graphic abstract
研究领域:
生物医学工程
·
肿瘤学
·
分析化学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Jiye Jia,Shijie Chen,Haifeng Tian,Dong Wang,Feng Yang,Pei Feng,Cijun Shuai
The low photogenerated charge carriers and quick complex annihilation of titanium dioxide (TiO 2 )/rGO composite leading to an unsatisfactory photocatalysis antibacterial effect limit its application in the bone scaffold. Herein, graphitic carbon nitride (g-C 3 N 4 ) was assembled with TiO 2 /rGO via a solvothermal method for enhancing the photocatalysis antibacterial properties of poly (lactic acid) (PLLA) bone scaffold prepared via selective laser sintering. The results revealed that g-C 3 N 4 expanded the light absorption range of TiO 2 /rGO from blue-violet light to visible light, resulting in the composites having a narrower band gap and producing more photoinduced charge carriers. More importantly, an S-scheme heterojunction was formed between g-C 3 N 4 and TiO 2 , which promoted the recombination of the electrons in the conduction band of TiO 2 and the holes in the valence band of g-C 3 N 4 . Meanwhile, rGO with excellent electrical conductivity reduced the interfacial charge transfer resistance and enhanced charge transfer efficiency, thus further avoiding the recombination rate of electrons and holes, whether TiO 2 or g-C 3 N 4 , and enhancing the photocatalytic properties. Consequently, the holes in the valence band of TiO 2 and the electrons in the conduction band of g-C 3 N 4 possessed high oxidation and reduction capacity, which oxidized H 2 O and reduced O 2 in the microenvironment, respectively, and generated lots of reactive oxygen species. In vitro antibacterial experiments indicated that the PLLA/TiO 2 /g-C 3 N 4 /rGO scaffold showed a better antibacterial effect, with the bacteriostasis rates of E. coli and S. aureus being 99.1% and 98.9%, respectively. In addition, cell adhesion and fluorescence results indicated that the scaffold had good biocompatibility and could provide a suitable microenvironment for the growth and proliferation of cells.
研究领域:
材料科学
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生物医学工程
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抗菌材料研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zijie Liu,Seulgi Ji,Shiqi Zhao,Xinge Hu,Xingda An,Tianqi Liu,Xiaorong Cheng,Heechae Choi,Graham Dawson
In order to boost the photocatalytic water splitting activity of g-C 3 N 4 , depositions of various multiple cocatalyst combinations have been suggested in a number of previous studies. Despite the improvement in photocatalytic activities bestowed on g-C 3 N 4 layers by the junctions of multiple cocatalyst particles at once, the complexities of synthesis procedures and fabrication conditions retard the wider applications or commercialization of such materials. In this study, we introduce a new effective strategy to improve the activity of a g-C 3 N 4 photocatalyst in water splitting: dual function hole carrier transport enhancement and reduced surface reaction energy barrier with phase-control of Fe 2 O 3 . The self-assembled solvothermal composites of Fe 2 O 3 and g-C 3 N 4 resulted in the formation of a three-phase heterojunction. The best composite demonstrated an effective hydrogen production rate of 5.53 mmol g −1 h −1 . The formation of the three-phase heterojunction between the two components was shown to alter the chemical environment and a band diagram of the system is proposed. Our density functional theory (DFT) calculations and ultraviolet photoemission spectroscopy (UPS) measurements revealed that the combination of ε-Fe 2 O 3 and α-Fe 2 O 3 improves the photocatalytic activity of g-C 3 N 4 by Fermi level pinning.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
A dye-sensitive photocatalytic H 2 evolution reaction (HER) system with photogenerated carrier directed conduction was constructed. The protonated g-C 3 N 4 combines with the sheet-like Co MOF to form a 2D/2D heterojunction via electrostatic self-assembly. The protonated g-C 3 N 4 and 2D Co-MOF directionally adsorb Eosin Y (EY) and triethanolamine (TEOA) molecules through hydrogen bond and complexation to achieve a whole photocatalytic system. The integral structure effectively facilitates the utilization of dye sensitizer and hole sacrificial agent to achieve the effective and stable photocatalytic H 2 evolution capacity. The photocatalytic hydrogen evolution rate of g-C 3 N 4 after protonation is 1.88 times as high as that of the original g-C 3 N 4 . On the basis of 2D/2D heterojunction, Co MOF is doped with rare earth element Sm. The 4f electrons and the difference valences (Sm 3+ and Co 2+ ) further suppress the reorganization of photogenerated excitons to achieve highly efficient photocatalytic HER. The directional coupling of sensitizer and electron sacrificial agent combined with rare earth element doping makes the photocatalytic HER rate of the composite material reached 73.42 μmol . h −1 within 5 h under simulated sunlight.
研究领域:
材料科学
·
光化学
·
能源科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
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
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2016
·Vol. 358
·期 16
·2631-2641
·
IF 6.453
Lingling Wang,Min Yu,Chaolong Wu,Nan Deng,Chao Wang,Xiaoquan Yao
In this contribution, an Ag/g-C 3 N 4 nanocomposite was synthesized and utilized as highly efficient and green photocatalyst for organic reactions under visible light irradiation. A layered, porous g-C 3 N 4 was synthesized following a modified solvothermal-roasting process by using melamine and cyanuric chloride as precursor. Silver nanoparticles (NPs) were well anchored on g-C 3 N 4 nanosheets, which were prepared by a facile impregnation–roasting method. The inexpensive, stable g-C 3 N 4 coupled with the localized surface plasmon resonance (LSPR) effect of Ag NPs exhibited high photocatalytic activities toward aerobic oxidative amidation of aromatic aldehydes under visible light irradiation. Good to excellent yields were achieved for various substrates under the light of a 25 W compact fluorescent light (CFL) bulb in air. The operationally easy procedure provides an economical, green, and mild alternative for the formation of amide bonds.
研究领域:
材料科学
·
有机化学
✓ 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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zihan Yang,Jingkai Yang,Lixia Li,Wanning Cao,Jiao Zhang,Hongli Zhao,Liqin Wang
The challenge of creating effective S-scheme visible-light photocatalysts persists due to the inactive visible-light-driven component and the low band-gap characteristics of semiconductors. In this work, we developed a novel F-BiVO 4 /g-C 3 N 4 /CdS dual S-scheme photocatalyst using a sonochemical method. The removal efficiency of Cr(VI) and ciprofloxacin (CIP) can reach 98 % and 90 % in 5 min and 30 min, respectively, under simulated solar illumination. The excellent photocatalytic activity can be attributed to the efficient carrier separation and transport with the help of internal electric field at the interface. This work also reveals the reduction process of Cr(VI), as well as the intermediates and pathways involved in the CIP degradation, taking into account practical situations and expanding its potential applications. This research presents promising prospects for the design of bismuth-based dual S-scheme heterojunctions in the field of environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiao-han Pan,Jian-hua Zu,Yi Xue,Si-yu Liu,Jing-jie Diao,Long Zhao
110m Ag nanoparticles ( 110m Ag Nps) is a radioactive contaminant in the process wastewater of nuclear power plants. In this study, the novel material containing amines PP-g-GMA@EDA as the adsorbent is proposed for the removal Ag Nps. PP-g-GMA@EDA is synthesized by γ ray-induced simultaneous irradiation grafting and its removal performances for Ag Nps from aqueous solutions has been studied. In Ag Nps solution at different pH values, PP-g-GMA@EDA possesses better removal efficiency than the commercial resin IRN9766 commonly used in nuclear power plants, especially at pH 4. XPS helps confirm that the adsorption mechanism is mainly ion exchange to negatively-charged Ag Nps by protonated secondary amines on the adsorbent. At the optimal pH 4, the effects of different parameters such as the initial Ag Nps concentration, the ratio of adsorbent dosage to solution volume and the adsorption time on adsorption performances are considered. 100% adsorption efficiency of Ag Nps can be achieved and the maximum adsorption capacity is 101.44 mg/g. The Langmiur isotherm model and the pseudo-first-order kinetic model better describe the adsoption process. In the simulated nuclear power plant process wastewater, even though the concentration of competitive ions is 40 times that of Ag Nps, the removal efficiencies still maintain above 85%. In addition, 5 wt% ammonia water can effectively desorb Ag Nps from the used adsorbent to ensure the recyclability of PP-g-GMA@EDA. The well designed adsorbent with excellent removal efficiency and selectivity provides a very efficient, sustainable, and industrially feasible way for Ag Nps decontamination from nuclear wastewater.
研究领域:
环境科学
·
放射化学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Pei Liu,Min Liu,Hunshun Yin,Yunlei Zhou,Shiyun Ai
Aberrant DNA methylation, which is caused by the abnormal level of DNA methyltransferase (MTase), has been considered associated with a growing number of human diseases. Although there are various methods paying close attention to DNA methyltransferase (MTase) detection, most of them are generally complex and expensive. Here, a simple electrochemical strategy for sensitive detection of DNA methyltransferase (MTase) and inhibitor screening based on DpnI digestion triggering the formation of G-quadruplex DNAzymes has been developed. In this paper, a probe richness of guanine (G) was first self-assembled on the surface of the electrode through Au–S bond and then hybridized with the complementary DNA. Without DNA methylation, G-quadruplex DNAzymes cannot be formed due to the double helix structure and a weak electrochemical response can be observed. On the contrary, an obvious enhancement of the electrochemical response can be achieved after the cleavage of the methylated double-strand DNA by DpnI since G-quadruplex DNAzymes can be obtained, which catalyze the oxidation of hydroquinone by H 2 O 2 with the assistance of the cofactor hemin. This method is under a detection limit of 0.96 U/mL and can monitor the change of DNA methylation level selectively. Moreover, RG108 was selected as a representative inhibitor for studying the inhibition activity of DNA MTase.
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Ying Li,Zhiquan Yang,Hongguo Zhang,Xiaowen Tong,Jinna Feng
An increasing amount of sewage sludge is produced by wastewater treatment plants worldwide. Therefore, the disposal of sewage sludge is one of the vital environmental issues currently. In the present work, we developed an alternative strategy of converting sewage sludge into porous activated carbon (SAC), and then synthesized a magnetically separable MnFe 2 O 4 -SAC heterogeneous catalyst through an environmentally friendly method. Several characterization techniques such as XRD, FTIR, SEM and XPS indicated the evidence of MnFe 2 O 4 nanoparticles successfully sticking to surface of porous SAC. The MnFe 2 O 4 -SAC composites exhibited stable and excellent catalytic activity in activating persulfate (PS) for the degradation of Orange G (OG) throughout the wide pH range of 3–9, and could be recycled by a magnet without any loss. The activation energy was calculated to be 14.94 kJ mol −1 , indicating that the OG degradation in MnFe 2 O 4 -SAC/PS process required moderate activation energy. The results of heavy metals leaching experiments revealed an excellent stability of the MnFe 2 O 4 -SAC catalyst. Possible reaction mechanism in MnFe 2 O 4 -SAC/PS system was also discussed in detail.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）