ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yuanyuan Zhang,Yuan Zhu,Tianjing Zeng,Lu Qiao,Mingjuan Zhang,Kexin Song,Nian Yin,Yani Tao,Yue Zhao,Chang Zhang,Yi Zhang
A highly sensitive photoelectrochemical aptasensor based on phosphorus-doped hollow tubular g-C 3 N 4 /Bi/BiVO 4 (PT-C 3 N 4 /Bi/BiVO 4 ) for tobramycin (TOB) detecting was developed. This aptasensor is a self-powered sensing system which could generate the electrical output under visible light irradiation with no external voltage supply. Based on the surface plasmon resonance (SPR) effect and unique hollow tubular structure of PT-C 3 N 4 /Bi/BiVO 4 , the PEC aptasensor exhibited an enhanced photocurrent and favorably specific response to TOB. Under the optimized conditions, the sensitive aptasensor presented a wider linearity to TOB in the range of 0.01–50 ng mL −1 with a low detection limit of 4.27 pg mL −1 . This sensor also displayed a satisfying photoelectrochemical performance with optimistic selectivity and stability. In addition, the proposed aptasensor was successfully applied to the detection of TOB in river water and milk samples.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jiamei Zhao,Xinyue Cao,Yibo Bai,Jie Chen,Conglu Zhang
Calcium titanate (CaTiO 3 ) has received more and more attention due to the excellent physicochemical properties. However, in the process of photocatalysis , the photogenerated carriers are very easy to recombine. Based on this problem, g-C 3 N 4 modified CaTiO 3 photocatalyst was prepared via calcination . The properties of CaTiO 3 /g-C 3 N 4 were analyzed through XRD , SEM , XPS , UV–vis and TGA . The optimized CaTiO 3 /g-C 3 N 4 could achieve 100% and 87.7% removal rate of methylene blue (MB) and levofloxacin (LVF), respectively, under a 500 W mercury lamp illumination within 120 min. In addition, the effects of photocatalyst dosage, solution pH and co-existing ions in water on the degradation process were systematically investigated. A possible charge transmission mechanism was analyzed and the LVF degradation pathway was proposed. This work will provide a new strategy to synthesize cost-effective CaTiO 3 composites.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Junfeng Yang,Yuyang Wu,Yanhui Dong,Hao Cui,Chenyang Shi,Hang Sun,Shengyan Yin
Herein, a ternary Bi@H-TiO 2 /B-C 3 N 4 type II heterostructure is successfully designed and prepared via metal Bi as cocatalyst for photocatalytic H 2 generation. As expected, under λ > 300 nm light, the highest photocatalytic hydrogen production rate (HPR) of Bi@H-TiO 2 /B-C 3 N 4 is up to 223.08 μmol g −1 h −1 . Excitingly, under visible light (λ > 400 nm), the highest HPR of Bi@H-TiO 2 /B-C 3 N 4 is increased to 18.84 μmol g −1 h −1 , which is about 67.3 times, 37.7 times and 6.8 times as high as that of H-TiO 2 , B-C 3 N 4 and H-TiO 2 /B-C 3 N 4 under the same conditions, respectively. Moreover, the electrochemical impedance spectroscopy and transient photocurrent tests manifest that the interface resistance of Bi@H-TiO 2 /B-C 3 N 4 composite decreases and the photocurrent density increases after loading metal Bi. These results indicate that loading metal Bi as cocatalyst (providing more electron trapping sites) is beneficial to improve photocatalytic activity in the type II heterostructure composite. And the electron transfer directions (B-C 3 N 4 → H-TiO 2 → Bi or B-C 3 N 4 → Bi) are proved by ultraviolet photoelectron spectroscopy test. Therefore, the Bi@H-TiO 2 /B-C 3 N 4 photocatalyst with strong visible light absorption is expected to be a promising candidate in photocatalytic fields under visible light.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 5
·950-958
·
IF 7.779
Shifei Kang,Zhihao Zhang,Maofen He,Zirou Fang,Di Sun,Lulu Zheng,Xijiang Chang,Lifeng Cui
Co-modification of graphitic carbon nitride (g-C3N4) photocatalysts can maximally optimize their intrinsic photoelectric structures, but usually involves complex multistep reactions, and thus is challenging because structural collapse and active site decay usually happen due to the complex process, over-treatment or conflict of different modification strategies. In this work, potassium iodate (KIO3), an edible salt additive, was used as a critical waste-free modifier in the thermal polymerization of g-C3N4, leading to a fast and coordinated co-modification of g-C3N4 photocatalysts. The final g-CN-KIO3 photocatalyst demonstrated a superior and balanced optical absorption ability and semiconductor band structure. In visible-light-driven photocatalytic model tests, g-CN-KIO3 showed a 3.25 times higher Cr(VI) photoreduction rate and five orders of magnitude lower residual bacteria in a photocatalytic sterilization within 120 min compared with raw g-C3N4. The photocatalytic performance of g-CN-KIO3 also outperformed all of the controls without maximized K–I–O co-modification (CN-K, CN-I, CN-O, and CN-KI). Photocurrent and electrochemical impedance experiments suggest that the co-modified photocatalysts have a faster charge separation ability, which is attributed to the multiple K–I–O co-modifications inducing an optimized surface electronic structure and slower carrier recombination. This work provides a new way to simplify and coordinate complex multi-factor regulation of materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Han Sun,Haiping Huang,Chao Hu,Yu Yan,Yongmei Hu,Sui-Jun Liu,He-Rui Wen
The Au-NiO x /g-C 3 N 4 (graphitic C 3 N 4 ) nanocomposite is synthesized and utilized as catalyst for the electrochemical oxidation of methanol in the alkaline electrolyte . Au and Ni nanoparticles are uniformly dispersed on ultrathin g-C 3 N 4 nanosheets by in-situ synthesis with nickel nitrate and chloroauric acid as Ni and Au resource respectively. The structure, morphology and component of the prepared nanocomposites are characterized by different techniques like transmission electron microscopy , X-ray diffraction, elemental mapping image and X-ray photoelectron spectroscopy. The results prove that the nanoparticles are well-distributed and embedded in g-C 3 N 4 nanosheets. The electrochemical performance of different nanocomposite for methanol oxidation reaction (MOR) is tested under alkaline conditions via electrochemical technologies. Compared to the pure g-C 3 N 4 and Au/g-C 3 N 4 , the NiO x /g-C 3 N 4 exhibits electrochemical catalytic effect toward methanol electro-oxidation with the existence of Ni. This electrochemical catalytic performance is enhanced significantly for the Au-NiO x /g-C 3 N 4 , whose oxidation peak current density is 2.32 times higher than NiO x /g-C 3 N 4 . The slope value drew from the Tafel plots shows that the Au-NiO x /g-C 3 N 4 owns the lowest Tafel slope (67.00 mV/dec). After the 7200 s stability test, the Au-NiO x /g-C 3 N 4 catalyst can still maintain a high current density . Long-term stability and good anti-poisoning ability promise Au-NiO x /g-C 3 N 4 a competitive non-Pt catalyst for the methanol oxidation.
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Nanomaterials
·
2022
·Vol. 12
·期 11
·1826
·
IF 5.719
Jiahui Zhang,Yan Jing,Peng Zhang,Benhua Xu
Herein, oxygen-doped g-C3N4quantum dots (OCNQDs) were fabricated through sintering and ultrasonic-assisted liquid-phase exfoliation methods. The obtained OCNQDs with uniform size show high crystalline quality, and the average diameter is 6.7 ± 0.5 nm. Furthermore, the OCNQDs display excellent fluorescence properties, good water solubility, and excellent photo stability. The OCNQDs as fluorescence probe show high sensitivity and selectivity to Fe3+ions. Furthermore, the fluorescent OCNQDs are applied for live cell imaging and Fe3+ions detecting in living cells with low cytotoxicity, good biocompatibility, and high permeability. Overall, the fluorescent OCNQDs fabricated in this work can be promising candidates for a range of chemical sensors and bioimaging applications.Keywords:oxygen-doped g-C3N4quantum dots;fluorescence;metal ion detection;bioimaging
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Nano Energy
·
2022
·
IF 19.069
Yanhua Cui,Zengkai Wang,Binrong Li,Yan Yan,Ruibo Xu,Minjia Meng,Yongsheng Yan
Piezoelectric materials have been widely used in photocatalytic systems as it forms a built-in electric field to facilitate the migration of photo-induced charge-carriers. Herein, we report a three-dimensional (3D) porous g-C 3 N 4 /LiNbO 3 /PVDF membrane with an enhanced fluid-induced piezoelectric field for photocatalytic hydrogen evolution reaction (HER). The freezing phase inversion strategy is critical to the formation of piezoelectric sensitive β phase PVDF. The unique 3D porous membrane structure and the fluid-induced piezoelectric potential synergistically contribute to the HER efficiency under white light illumination. The as-prepared g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric photocatalytic membrane (19.6875 cm 2 in size) exhibited HER rate of 136.02 µmol h −1 , which was even higher than that of the g-C 3 N 4 /LiNbO 3 powder sample (111.8 µmol h −1 ) with the identical mass of catalyst particles . In-situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) demonstrates a better water affinity of the porous g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric membrane prepared by the freezing phase inversion than other PVDF membranes prepared by traditional phase inversion and vacuum drying methods. Piezoelectric force microscopy (PFM), in-situ piezoelectric and piezoelectric current measurements further visualized the fluid-induced piezoelectric field on 3D g-C 3 N 4 /LiNbO 3 /PVDF membrane, by which boosting the HER efficiency.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Fengzhi Wang,Jiaqi Hu,Rong Liang,Weisheng Lei,Zirui Lou,Xinhua Pan,Bin Lu,Zhizhen Ye
Binary heterostructures (named as CN@Re) composed of ReS 2 nanospheres and g-C 3 N 4 nanosheets are constructed by electrostatic self-assembly method. The ReS 2 nanospheres were prepared by hydrothermal method and the g-C 3 N 4 nanosheets were treated with surface charge modification. Hydrogen production efficiency of modified CN and CN@Re nanostructures was evaluated in a simulated solar environment. To our surprise, CN5@Re5% exhibits the highest H 2 production up to 1823 μmol g −1 h −1 of CN5@Rey, which is 3.2 times as high as CN. The improvement of the photocatalytic hydrogen production efficiency of modified CN is attributed to its interaction with the hole sacrificing agent lactic acid, while the improvement of the photocatalytic activity of CN@Re nanostructure is attributed to the efficient electron transfer efficiency between CN and ReS 2 and the enhanced light absorption capacity brought by ReS 2 . In addition, the photocatalytic stability of CN5@Re5% has been studied, which can maintain a stable rate of hydrogen production over four cycles. The apparent quantum efficiency is as high as 4.10% at 365 nm and 2.82% at 420 nm.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Qiongqiong Wang,Yaxi Tian,Mengyun Chen,Rongfeng Guan,Haibin Yuan
Photocatalytic production H 2 of splitting water is an important branch of the application of photocatalytic materials. In this paper, porous C doped carbon nitride was successfully synthesized by calcining urea and acetamide at high temperature, and then analyzed by various characterization methods. XRD and FT-IR spectra show that the crystal structure of carbon nitride modified by acetamide are similar to bulk carbon nitride. SEM and TEM spectra show that the morphology and structure of carbon nitride and carbon nitride was modified by acetamide, which presents a porous nanosheets structure. XPS and EDS show that the content of carbon element in carbon nitride modified by acetamide increased significantly. The PL spectrum is obviously red shift, and the light absorption range is obviously enlarged, which is consistent with the absorption edge of UV–vis Spectrum. The BET of the optimized sample CN2-6 is 122.79 m 2 g -1 , which is 3.04 times higher than that of bulk carbon nitride CN1 (40.456 m 2 g -1 ). In addition, the hydrogen production of CN2-6 is 13169.04 μmol/g/h under 300 W Xenon lamp, which is 14.95 times more than CN1 (880.82 μmol/g/h) hydrogen production rate. When the light source is a 10 W LED lamp , the apparent quantum efficiency (AQE) of sample CN2-6 reaches the maximum (2.91) under the wavelengths of 430 nm, which is 1.27 times more than CN1 under the same conditions. Meanwhile, prepared samples have excellent stability and durability under visible light.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 23
·7727-7739
·
IF 6.119
Biao Zhu,Qianxin Xu,Xiaoyan Bao,Dawei Lu,Hao Yin,Yumei Qin,Xing-Can Shen
The development of efficient and stable photocatalysts to solve environmental issues is essential and remains a big challenge. In this work, flower-like CoNiFe-LDH is deposited in situ on g-C3N4 nanosheets, successfully constructing a Z-scheme heterojunction CoNiFe-LDH/g-C3N4 photocatalyst for the photoreduction of CO2 and photodegradation of MB dye. The synthesized nanohybrid shows superior photocatalytic CO2 performance (42.04 μmol g−1 h−1) and fast photodegradation MB performance (0.1057 min−1). The improved photocatalytic performance was attributed to the formation of the Z-scheme heterojunction with matched energy bands, and the intimate heterojunction contact interface, which significantly enhanced the interfacial charge transfer rate and improved the separation efficiency of electron–hole pairs. Moreover, the photocatalytic mechanism was proposed based on PL, photocurrent responses, EIS, and EPR experiments. This work can shed light on further application for environmental problems of Z-scheme heterojunction photocatalysts.
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ANALYST
·
2021
·Vol. 147
·期 2
·247-251
·
IF 4.616
Jun-Tao Cao,Yi-Zhuo Fu,Xiao-Long Fu,Shu-Wei Ren,Yan-Ming Liu
Herein, a novel and facile dual-wavelength ratiometric electrochemiluminescence-resonance energy transfer (ECL-RET) sensor for hydrogen sulfide (H2S) detection was constructed based on the interaction between S2− and Cd2+-doped g-C3N4 nanosheets (NSs). Cd2+-doped g-C3N4 NSs exhibited a strong ECL emission at 435 nm. In the presence of H2S, CdS was formed in situ on g-C3N4 NSs by the adsorption of S2− and Cd2+, generating another ECL emission at 515 nm. Furthermore, the overlapping of the absorption spectrum of the formed CdS and the ECL emission spectrum of g-C3N4 NSs led to a feasible RET, thus quenching the ECL intensity from g-C3N4 at 435 nm. Through an ECL decrease at 435 nm and an increase at 515 nm, a dual-wavelength ratiometric ECL-RET system for H2S was designed. The sensor exhibited a lower detection limit of 0.02 μM with a wide linear range of 0.05–100.0 μM. In addition, the applicability of the method was validated by plasma sample analysis with a linear range of 80.0–106.0%. We believe that such a proposal would provide new insight into advanced dual-wavelength ECL ratiometric assays.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 5
·2101831
·
IF 6.389
Dekai Wu,Chengzhe Yang,Jie Sun,Peng Zhong,Xiaohua Ma,Yimin Lei
In this paper, Ti 4 O 7 /g-C 3 N 4 nanocomposites are successfully prepared by hydrothermal and carbothermal reduction reaction. It shows large specific surface area and electrochemical active surface area (ECSA = 187.82 cm 2 ) and can act as an oxidation reduction reaction catalyst. Compared with commercial Pt/C catalyst, Ti 4 O 7 /g-C 3 N 4 nanocomposites show good catalytic activity in alkaline medium. The peak potential, onset potential, and half-wave potential are 0.74 (versus RHE), 0.96 (versus RHE), and 0.74 V (versus RHE), respectively. It is worth mentioning that Ti 4 O 7 /g-C 3 N 4 catalyst shows better methanol tolerance and cycle stability than commercial Pt/C catalyst. The relative current density attenuation is less than 30% after a long cycle of 24 h.
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