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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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 36
·17072-17079
·
IF 3.3
Hongmei Xie,Guozhi Zhu,Dawei Ye,Weiquan Cai,Junjie Zhang,Kangping Huang,Yuliang Mai,Bing Liao,Jiazhi Chen
Catechyl lignin (C-lignin) is a unique and attractive natural biopolymer used as raw material for the production of chemicals and materials due to its homogeneous linear aromatic structure. Tung nutshells, an important component of industrial solid waste, are rich in C/G-type Lignin. Herein, for the first time, we report that the catalytic oxidation strategy is effective for the conversion of Tung nutshell lignin to value-added C/G-type aromatic monomers using the commercially available CuCl2 catalyst. The reaction conditions, including solvent, temperature, and catalyst dosage, were comprehensively investigated. The optimal yield of 60.8 mg g−1 (or 12.9 wt% Klason lignin) C/G-type aromatic aldehydes and acids was obtained using the CuCl2 catalyst in the CH3CN/H2O (8/2, v/v) solvent mixture at 190 °C for 4 h. The C-type aromatic monomers were formed with an yield of 7.7 mg g−1 (or 1.6 wt%) in the initial 0.2 h and gradually decreased as the reaction progressed. The less amount of C-type lignin-derived aromatic monomers can be attributed to their lower thermal stability under oxidative conditions. The structural evolution study of lignin by GPC and HSQC NMR reveals that the C/G units are effectively depolymerized and transformed into aromatic aldehydes and acids by the CuCl2/CH3CN/H2O catalytic oxidative system.
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Advanced Energy and Sustainability Research
·
2023
·Vol. 4
·期 10
·2300072
·
IF 5.8
Haohui Huang,Xingqiang Liu,Feng Li,Qingyun He,Chengfa Tao,Longfu Wei,Changlin Yu,Hongbing Ji
Herein, well-crystallized ZnTiO 3 particles are first prepared by hydrothermal method. A series of S-scheme heterojunction photocatalysts of ZnTiO 3 /g-C 3 N 4 (referred to as ZTO/CN) with different mass ratios are synthesized by successfully doping ZnTiO 3 in g-C 3 N 4 precursors and loading ZnTiO 3 onto g-C 3 N 4 nanosheets by calcination. It is clearly found that the ZnTiO 3 particles are successfully loaded on g-C 3 N 4 nanosheets by the X-ray diffractometer, energy-dispersive X-ray spectra, and high-resolution transmission electron microscopy images. Moreover, the specific surface area of 3.0% ZTO/CN is higher than that of pure g-C 3 N 4 . Using triethanolamine as the hole sacrificial agent, the highest CO and H 2 yields are achieved in the 3.0% ZTO/CN composite catalyst under the xenon lamp irradiation for 1 h. The generation rates of CO and H 2 reach 15.19 and 5.77 μmol g −1 h −1 , respectively, which are 2.9 and 4.1 times higher than that of pure g-C 3 N 4 . The CO and H 2 yields of the ZTO/CN composite catalyst show a trend of increasing and then decreasing with the increasing of ZnTiO 3 content, which is due to the fact that excess ZnTiO 3 can lead to a reduction of the effective heterojunction interface between ZnTiO 3 and g-C 3 N 4 , decreasing the transfer and separation efficiency of photogenerated electrons and holes and thus reducing the photocatalytic activity.
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CARBON
·
2023
·
IF 10.9
Hao Wang,Jiangwen Liao,Jiajun Zhong,Yunpeng Liu,Lei Yao,Lixiong Qian,Yuecheng Lai,Xin Wang,Yikun Li,Jianxin Song,Xueqing Xing,Guang Mo,Zhongjun Chen,Zhonghua Wu
In this paper, the unclear Ni atom coordination structure evolution in one-pot pyrolysis method synthesizing Ni single atom catalyst using graphitic carbon nitride as support (Ni-g-C 3 N 4 ) was deeply discussed. In-situ X-ray absorption fine structure spectra and other assisted methods were used to characterize the structural evolution. The results demonstrate that the pyrolysis process can be divided into three stages. In the first stage from room temperature to 183 °C (Stage I), the NiCl 2 ⋅6H 2 O was mixed with the supporting material (dicyandiamide) to form the precursor with Ni-(H 2 O) 6 octahedral coordination configuration. In the second stage from 183 to 350 °C (Stage II), the H 2 O molecules have been removed and the supporting material was converted to melamine. The melamine molecules were polycondensed to melem during 308–350 °C. The intermediates labeled Ni-melamine and Ni-melem was formed with Ni-N 4 planar quadrilateral coordination configuration. In the third stage from 350 to 600 °C (Stage III ), the supporting material (melem) was gradually converted to g-C 3 N 4 , and the Ni-N 4 coordination configurations were replaced by Ni-N 6 planar hexagon coordination configuration one by one. The three Ni coordination configurations were further confirmed by Reverse Monte Carlo simulations and ab initio calculations .
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 30
·10515-10521
·
IF 4
Yun Wu,Rui Yao,Qiang Zhao,Jinping Li,Guang Liu
The electrolysis of water, particularly proton exchange membrane (PEM) water electrolysis, holds great promise for hydrogen production in industry. However, the catalyst used in this process is prone to dissolution in acidic environments, making it imperative to develop cost-effective, highly efficient, and acid-stable electrocatalytic materials to overcome this challenge and enable large-scale application of PEM water electrolysis technology. Herein, we prepared ruthenium oxide (RuO2)/graphitic carbon nitride (g-C3N4) composites (RuO2/C3N4) via a combination of sol–gel and annealing methods. The g-C3N4 provides a large surface area, while RuO2 is uniformly deposited on the g-C3N4 surface. The interaction between g-C3N4 and RuO2 stabilizes the RuO2 nanoparticles and enhances long-term water oxidation stability. This unique structure and the combined advantages of RuO2 and g-C3N4 yield exceptional electrocatalytic activity toward both the oxygen evolution reaction (OER, 240 mV@10 mA cm−2) and the hydrogen evolution reaction (HER, 109 mV@10 mA cm−2), with excellent durability (over 28 h), and a cell voltage of 1.607 V at 10 mA cm−2 when used in an RuO2/C3N4||RuO2/C3N4 electrolyzer. This study highlights the efficacy of the g-C3N4 support method in designing highly stable Ru-based OER electrocatalysts for efficient acidic water splitting.
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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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Defence Technology
·
2023
·
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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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
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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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Fushan Wen,Le Pang,Tao Zhang,Xiaoli Huang,Yuan Xu,Yajie Li
The exploitation of the superior oxygen evolution reaction (OER) electrocatalysts is of great paramount importance to the investigation of developing hydrogen production from water splitting to alleviate the energy crisis. Herein, Fe 3+ ion doped NiS 2 for OER electrocatalysts obtained from a metal-organic framework (MOF) as a self-template, with the graphitic phase carbon nitride (g-C 3 N 4 ) as a chain armor, was prepared by the two-step solvothermal-pyrolysis method. The MOF-derived Fe–NiS 2 @g-C 3 N 4 composite achieves a current density of 10 mA cm −2 at a tiny OER overpotential (280 mV) and shows good stability in duration tests over 60 h. Compared with the undoped sample, the overpotential is significantly lower by 60 mV and the stability is substantially improved. In this study, two strategies, iron ion doping and g-C 3 N 4 coating, were implemented to target the defects of NiS 2 , promoting its catalytic activity and achieving a significant improvement in stability at the cost of a bit of activity. Balancing activity and stability maximized has been achieved by our work. This study presents a potential approach to improve the catalyst activity and stability in an integrated strategy.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chun Feng,Lijuan Zhu,Yaqiong Cao,Yin Di,Zongxue Yu,Guhui Gao
This study reports a new strategy for enhancing the anti-corrosion properties of epoxy coatings. For this purpose, beta-cyclodextrin-graphene oxide (β-CD-g-GO) nanosheets were synthesized via anchoring beta-cyclodextrin on a graphene oxide surface in the presence of 3-glycidoxypropyltrimethoxysilane (KH560). The structure of the material was characterized by SEM, EDX, XRD, FT-IR and TGA. The inclusion of 2 wt. % GO and β-CD-g-GO nanosheets in epoxy resin remarkably enhanced the corrosion protection performance of the material relative to that of pure epoxy coating. Electrochemical impedance spectroscopy (EIS) measurements revealed that the impedance of the epoxy coating was improved after the addition of 2 wt. % GO and β-CD-g-GO nanosheets. The most pronounced improvement in the properties of the epoxy coating was obtained using β-CD-g-GO nanosheets. Scratches tests confirmed the reduced steel substrate corrosion in the case of epoxy coating that included β-CD-g-GO nanosheets compared to the corrosion obtained for other samples.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Feng Yang,Xiujiu Yang,Shaojun Chen,Hong Hai,Xiaoping Wei,Xiaoming Wan,Wenguang Jiao,Jiaji Yi
Developing rapid and renewable sensors to detect heavy metal lead ions is a crucial and promising area of research. Herein, we constructed a label-free electrochemiluminescence (ECL) sensor for detecting Pb 2+ using magnetic nanoparticles that were modified with a G-quadruplex probe. The aptamer probe was created by immobilizing a double-stranded DNA (dsDNA) onto the surface of Fe 3 O 4 @Au magnetic nanoparticles, with Ru(phen) 3 2+ being intercalated into the dsDNA structure. Upon introduction of Pb 2+ , the dsDNA structure opened up to form the Fe 3 O 4 @Au-G-quadruplex-Pb 2+ structure, resulting in the dissociation of single-stranded DNA (ssDNA) and Ru(phen) 3 2+ . The dissociated Ru(phen) 3 2+ acted as an ECL probe, allowing for the construction of a highly sensitive sensing system that quantitatively relates Pb 2+ concentrations to ECL signals. In the presence of the strong chelating agent EDTA, the hybridization of the two ssDNA strands back into the dsDNA structure allowed for the re-insertion of Ru(phen) 3 2+ into the dsDNA structure, endowing the sensor with excellent renewability. The adapter sensor was characterized using cyclic voltammetry, electrochemiluminescence, and fluorescence spectroscopy. Over the range of 50 pM to 9 nM, the Pb 2+ concentration exhibited a linear relationship with its corresponding ECL signal, with a detection limit of 1.2 pM. In addition, the biosensor demonstrated outstanding selectivity, stability, reproducibility, and potential for use in real-world sample applications.
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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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