Defence Technology
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2023
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IF 5.1
Yujie Yan,Bo Jin,Rufang Peng
Biomass chitosan (CS) was used as a template, graphitic phase carbon nitride (g-C 3 N 4 ) with high nitrogen content and certain catalytic activity was used as a dopant, and nano-transition metal cobalt (Co) was used as a catalytic center point. The carbon aerogel (C (CS)/g-C 3 N 4 /Co) with a three-dimensional network-like structure was prepared by assembling the three materials through experimental operations such as freeze-drying and high-temperature carbonization. It was demonstrated by scanning and transmission characterization that the CS in the carbon aerogel could provide more active sites for the cobalt nanoparticles, and the doping of graphite-phase carbon nitride as a template dispersed the cobalt nanoparticles and changed the conductivity of the CS. To investigate the catalytic effect of carbon aerogel on ammonium perchlorate (AP), it was investigated by differential thermal analyzer and TG thermal analysis. This carbon aerogel was very effective in catalyzing AP, and the 10 wt% content of the catalyst reduced the AP pyrolysis peak from 703.9 to 595.5 K. And to further investigate the synergistic effect of the three materials, further carbon aerogels such as C (CS)/Co, g-C 3 N 4 /Co were prepared and applied to catalyze AP, and the same ratio reduced the AP pyrolysis peak by 98.1 °C and 97.7 °C. This result indicates a synergistic effect of the assembly of the three materials.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-9
·
IF 5.7
Hao Xuanxuan,Liu Zhimin,Fan Yunfeng,Wang Jie,Cui Chen,Hu Leqian
A novel electrochemiluminescence (ECL) aptasensor, using graphite carbonitride (g-C 3 N 4 ) capped CdS quantum dots (CdS QDs@g-C 3 N 4 ) and Au nanoparticles decorated triethanolamine (AuNPs@TEOA) as dual coreactants, was proposed for the determination of mucin 1 (MUC1). Higher ECL efficiency was acquired due to the double enhancement contribution of CdS QDs and TEOA to Ru (bpy) 3 2+ ECL. Additionally, AuNPs@TEOA also acted as nanocarrier for MUC1 aptamer immobilization. After the aptasensor was incubated in target MUC1, the decreased ECL emission was obtained because of the poor conductivity of MUC1. The ECL aptasensor displayed a good linear correlation for MUC1 in the range 0.1 pg mL −1 -1000 ng mL −1 , and the detection limit was 33 fg mL −1 . MUC1 spiked into human serum samples was quantified to assess the practicability of the ECL aptasensor. Graphical abstract
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高影响因子
Greenhouse Gases-Science and Technology
·
2023
·Vol. 13
·期 5
·689-698
·
IF 2.2
Xuewei Tu,Luping Zhang,Yutong Chen,Shouxin Zhu,Can Sun,Jiali Jin,Min Liu,Hui Zheng
The conversion of CO 2 into valuable chemicals to reduce greenhouse gas emissions has received extensive attention. Converting CO 2 into pharmaceutical intermediates via graphitic carbon nitride (CN) at atmospheric pressure is a challenge. In this work, a series of novel graphitic carbon nitrides (K-CN) catalysts with different doping ratios of K were synthesized by post-treatment of CN with KOH as a dopant under magnetic stirring. Herein, substrates of o -phenylenediamine with different electron-donating/withdrawing groups were employed to convert CO 2 into high-value heterocyclic benzimidazoles. The optimal reaction conditions were determined by a single factor optimization approach. A series of benzimidazole derivatives were synthesized with a yield of up to 96% under atmospheric pressure, indicating that the catalyst can efficiently fix CO 2 . This work not only designs a simple and low-cost K-CN catalyst but also provides a new pathway for converting CO 2 into valuable benzimidazole derivatives at atmospheric pressure. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 22
·7447-7456
·
IF 4
Qian Chen,Jianfeng Huang,Ting Xiao,Liyun Cao,Dinghan Liu,Xiaoyi Li,Mengfan Niu,Guoting Xu,Koji Kajiyoshi,Liangliang Feng
Exploring low-cost and highly active photocatalysts with noble metal-free cocatalysts is of great significance for photocatalytic hydrogen evolution under simulated sunlight irradiation. In this work, a novel V-doped Ni2P nanoparticle loaded g-C3N4 nanosheet is reported as a highly efficient photocatalyst for H2 evolution under visible light irradiation. The results demonstrate that the optimized 7.8 wt% V-Ni2P/g-C3N4 photocatalyst exhibits a high hydrogen evolution rate of 271.5 μmol g−1 h−1, which is comparable to that of the 1 wt% Pt/g-C3N4 photocatalyst (279 μmol g−1 h−1), and shows favorable hydrogen evolution stability for five successive runs within 20 h. The remarkable photocatalytic hydrogen evolution performance of V-Ni2P/g-C3N4 is mainly due to the enhanced visible light absorption ability, the facilitated separation of photo-generated electron–hole pairs, the prolonged lifetime of photo-generated carriers and the fast transmission ability of electrons.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Tao Xu,Rongyan Wang,Chenjie Gu,Tao Jiang
Surface-enhanced Raman scattering (SERS) technology enables to satisfy the increasing demand of clinical drug monitoring due to the superiority of fingerprint recognition, real-time response, and nondestructive collection. Here, a novel graphitic carbon nitride (g-C 3 N 4 )/ molybdenum disulfide (MoS 2 )/Ag composite substrate with a 3D surface structure was successfully developed for the recyclable detection of gefitinib in serum. Attributed to the uniform and dense “hotspots” on the shrubby active surfaces in conjunction with the potential synergistic chemical enhancement of g-C 3 N 4 /MoS 2 heterosystem, a remarkable SERS sensitivity with an attractive enhancement factor value of 3.3 × 10 7 was demonstrated. Meanwhile, a type-II heterojunction between g-C 3 N 4 and MoS 2 enabled more efficient diffusion of photogenerated e − -h + pairs assisted by the localized surface plasmon resonance of Ag NPs, which contributed to the reliable recyclable detection of gefitinib. The ultra-low limit of detection at 10 −5 mg/mL and high recycling rates of gefitinib beyond 90% in serum were successfully realized. The results demonstrated the as-prepared SERS substrate has tremendous potential to be untilized for in-situ drug diagnostics.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yuhang Gao,Chenxi Zhao,Qiyue Tan,Mingkun Gao,Ge Chen,Rongqi Zhai,Xiaodong Huang,Xiaomin Xu,Guangyang Liu,Jing Wang,Yaowei Zhang,Donghui Xu
In this study, a magnetic composite material was prepared based on covalent organic framework (COFs) materials for the detection of trace organophosphorus pesticides . Fe 3 O 4 @C 3 N 4 @COFs were synthesized by a layer-by-layer assembly strategy and applied to the selective identification, detection and removal of profenofos pesticides using magnetic solid-phase extraction technique. After seven regeneration cycles, the composite exhibited excellent selectivity and affinity for profenofos, and eventually still achieved an extraction efficiency higher than 75%. Under optimized conditions, the proposed magnetic solid-phase extraction method coupled with high-performance liquid chromatography-tandem mass spectrometry showed a low limit of detection (1 × 10 −5 μg/mL) for profenofos. The developed method was successfully used to detect profenofos in spiked fruit samples with satisfactory recoveries (74.33% −116.59%) and relative standard deviations (0.27% −7.41%). This study highlights the potential of COFs-based magnetic composites in sample pretreatment for targeted analysis and is a novel pathway for efficient sample preparation in food safety analysis.
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Nano Energy
·
2021
·
IF 17.881
Xue Li,Jundie Hu,Tingyu Yang,Xiaogang Yang,Jiafu Qu,Chang Ming Li
Effectively utilize photogenerated holes (h + ) of catalysts while blocking rapid recombination of photoinduced carriers are the two critical challenges for solar-to-hydrogen (STH) conversion. Here, an exquisite 2D/2D LaVO 4 /g-C 3 N 4 (LaVO 4 /CN) heterostructure is delicately designed and fabricated for efficient photocatalytic H 2 -evolution while producing high value-added furfural simultaneously. The abundant biomass furfuryl alcohol (FFA) is employed to substitute the traditional h + sacrificial agents such as triethanolamine (TEOA) for the oxidation half reaction, which is very meaningful to balance the H 2 -evolution half reaction. The LaVO 4 /CN heterojunction enables 3-time increased H 2 -evolution and a high furfural-production rate (0.95 mmol g −1 h −1 ) than that of pristine graphite carbon nitride (g-C 3 N 4 , labeled as CN), and with a 22.16% H 2 -evolution apparent quantum efficiency (AQE) irradiated at 400 nm. This work provides an exquisite catalyst and a new strategy for efficient photocatalytic H 2 -evolution coupled with production of high valuable chemicals.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Dongxu Wang,Juan Chen,Xin Gao,Yanhui Ao,Peifang Wang
Effective contact between photocatalysts and algal cells is important for algae inactivation because of the efficient transfer/utilization of photo-generated charges. Herein, sulfuric acid exfoliated C 3 N 4 (S-CN) is found to be efficient for algae inactivation under visible light irradiation (92% removal rate within 3.5 h). The high performance can be ascribed to the positive surface charge (S-CN can be rapidly adsorbed on the surface of algal cells) and small sized/ultrathin structure (high separation/transfer efficiency of charges). Furthermore, the efficiency can be improved significantly by H 2 O 2 addition (94.3% removal rate within 1.5 h). The addition of H 2 O 2 not only reduce the recombination of photo-induced carriers but also generate more ·OH. Decreased photosynthetic activity, membrane damage and cell rupture occur in the inactivation process. In addition, the organic matters release and leak from algal cells are also partly removed. The present work has great significance in the application of photocatalytic technology for algal remediation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jingjun Liu,Haiping Zhou,Jiajie Fan,Quanjun Xiang
With photoconductor being transferred and separated, interface contact plays a crucial role in developing composites photocatalyst . In the present work, 2D crystalline g-C 3 N 4 (called as CCN) with 2D TiO 2 nanosheets (called as TO) obtained in situ oxidized single-layered Ti 3 C 2 T x MXene is designed by an electrostatic self-assembly technology. This CCN/TO nanosheets system with a few TiO 2 nanosheets distributed to the surface is not only prolonging lifetime of photoelectron but also stimulating photogenerated carriers transferred in contact interface. The electron transfer mechanism of CCN/TO is further proved by Pt photo-deposition method. Therein, the optimal CCN-TO-0.6 exhibits excellent performance of H 2 generation compared with single photocatalyst of CCN. The result shows that the crystalline g-C 3 N 4 photocatalysts introduced TiO 2 with interfacial effect favorably reduce H + to H 2 and enhance photocatalytic activity .
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Tao Ke,Shuyi Shen,Kun Yang,Daohui Lin
Developing visible-light-driven photocatalysts with high charge separation and transfer efficiency to degrade organic pollutants in wastewater remains a major issue. In this work, quaternary Bi 2 O 3 /C 3 N 4 /TiO 2 @C (BCTC) hybrids were successfully fabricated by hydrothermal and calcination two-step method using Bi(NO 3 ) 3 ·5H 2 O, C 3 N 4 , and Ti 3 C 2 as precursors. The optimized BCTC hybrids with the dosage of 1 g L −1 (BCTC-2%) exhibited high photocatalytic activity, degrading 100% sulfamethoxazole (SMZ, 5 mg L −1 ) within 100 min under visible light irradiation. Moreover, the photocatalytic degradation rate of SMZ by the quaternary junction was found to be 5.12-, 2.87-, and 1.35-fold higher as compared with Bi 2 O 3 /C 3 N 4 , C 3 N 4 /TiO 2 @C, and Bi 2 O 3 /TiO 2 @C junctions, respectively. The enhanced photocatalytic performance of BCTC hybrids could be attributed to the formation of a double Z-scheme photocatalytic system and the photosensitization of Bi 2 O 3 and C 3 N 4 . The photogenerated hole (h + ) was the primary reactive species that degraded SMZ. The plausible intermediates during the photocatalytic degradation of SMZ were identified by high-performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry and the degradation pathway was postulated. Importantly, BCTC-2% had a good photocatalytic activity for degrading SMZ in natural water samples, indicating the high potential of BCTC hybrids for wastewater treatment applications.
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高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Xiaoyue Huang,Yan Hu,Liang Zhou,Juying Lei,Lingzhi Wang,Jinlong Zhang
As a greenhouse gas, CO 2 is also a rich carbon resource. Using sunlight to reduce CO 2 to usable substances through photocatalysis can alleviate the greenhouse effect and realize energy recycling. Herein, CuS nanoparticles are grown in situ on the surface of inverse opal g-C 3 N 4 by a one-step hydrothermal method. The inverse opal structure can increase the specific surface area of the material, and CuS can be used as the cocatalyst to accept photo-generated electrons on the conduction band of g-C 3 N 4 , thereby promoting the separation and transfer of photo-generated charges. And the interfacial charge transfer mechanism of CuS further improves the separation efficiency of photogenerated electrons and holes. The photocatalytic reduction of CO 2 activity of the prepared catalyst is greatly improved. The CO yield reaches 13.24 μmol g −1 h −1 . A new strategy is provided to develop artificial photosynthesis for reduction of CO 2 .
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xingchao Zhang,Ruoyu Zhang,Siying Niu,Jiming Zheng,Chongfeng Guo
The MoS 2 /g-C 3 N 4 heterojunction composite (marked as MoS 2 /g-C 3 N 4 -H) was successfully prepared via calcining the melamine coated MoS 2 nano-sphere, where the thin g-C 3 N 4 nano-sheets were tightly grown on the surface of MoS 2 nano-sphere to form MoS 2 inlaying in g-C 3 N 4 heterostructure. The detailed charge transfer mechanism was discussed by combining theoretical calculation and experiments, in which the intrinsic cause of photo-generated charge separation and transfer was determined as the directional built-in electric field driven by different Fermi levels of MoS 2 and g-C 3 N 4 . Comparatively, the enhanced photo-catalytic performance and stability of the sample were assessed by degrading the Rhodamine (RhB) and reducing the Dichromate (Cr 6+ ) solutions under the irradiation of the simulated sunlight, which could be attributed to the widened spectral absorption range and improved electron-hole separation rate. Based on above results, the photo-catalytic mechanism involving redox reactions was also clearly proposed.
研究领域:
材料科学
·
环境科学
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