Nanoscale Advances
·
2020
·Vol. 2
·期 11
·5396-5402
·
IF 0
Zhou Liu,Shuzhen Wu,Xiaojie Yang,Yijun Zhou,Jiaren Jin,Junmei Sun,Li Zhao,Shimin Wang
Carrier recombination and charge loss at the interfaces of perovskite layers have a significant influence on high-performance planar perovskite solar cells (PSCs). We employed two-dimensional graphitic carbon nitride (g-C3N4), which is a heat-resistant n-type semiconductor, to modify the electron-transport layer/perovskite and perovskite/hole-transport layer interfaces, respectively. g-C3N4 could passivate the surface trap states of the methylammonium lead iodide light absorber through the formation of a Lewis adduct between N and the under-coordinated Pb, and it could also remarkably reduce the grain boundaries between perovskite crystal particles. A maximum power conversion efficiency (PCE) of 19.67% (Voc = 1.14 V, Jsc = 21.45 mA cm−2, FF = 0.807) could be obtained from planar PSCs with long-term stability using dual-positioned g-C3N4. Therefore, we consider that ultrathin semiconductor films with a Lewis base nature are suitable as dual-functional transport materials for devices. This work provides new guidance for dual-interfacial modification to improve the PCE and stability of devices.
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Catalysts
·
2024
·Vol. 14
·期 9
·579
·
IF 3.8
Qingbao Gan,Jianwei Zhang,Jinglin Wang,Yuntian Wei,Shikun Chen,Shuguang Cai,Xueqing Xiao,Chan Zheng
The excessive discharge of antibiotics into aquatic systems is a major issue in many countries worldwide and poses a threat to human health and the sustainable development of society. Hence, developing efficient treatment methods and purification technologies to degrade antibiotics is essential. Herein, we present the synthesis of low-cost, self-propelled tubular Fe3+-incorporated graphitic carbon nitride (g-C3N4-Fe@KF) micromotors using kapok fibers (KFs) as templates and their application as photo-catalysts for the photo-Fenton degradation of tetracycline (TC) under visible-light irradiation. The g-C3N4-Fe@KF micromotors moved rapidly when being propelled by oxygen bubbles generated in a hydrogen peroxide (H2O2) solution as a result of a photo-assisted Fenton reaction. The motion behavior of the g-C3N4-Fe@KF micromotors was dependent on the concentration of H2O2and the length of the micromotors. The propulsion mechanism was discussed in detail. The micromotors efficiently degraded antibiotics via the photo-Fenton process. Photo-Fenton degradation efficiency was attributed to the synergistic effects of the doped Fe3+and g-C3N4under visible-light irradiation and self-propulsion of the micromotors. In addition, the micromotors possessed good reusability, thereby efficiently realizing multiple cycles of degradation. The current work offers an avenue for the design of micromotors, using inexpensive approaches, for various potential environmental applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Xiaoyan Wang,Yu Yuan,Jingru Lai,Xiaoli Shi,Mingye Ding
Solar-driven water splitting for hydrogen production is a pivotal technique for sustainable energy conversion. However, its efficiency is constrained by intermittent solar irradiation and rapid charge recombination. To overcome these limitations, designing a round-the-clock photocatalyst with high charge storage capacity that can still operate effectively under low light flux after sunset and promote charge carrier separation is a promising strategy. Herein, by selecting SrAl 2 O 4 :Eu 2+ /Dy 3+ persistent phosphors as electron-trapped centers and g-C 3 N 4 semiconductor as visible-light photocatalyst, SrAl 2 O 4 :Eu 2+ /Dy 3+ @g-C 3 N 4 composite has been successfully synthesized via in-situ growth strategy to form a conventional type II heterojunction photocatalyst. Benefiting from the excellent ability of charge storage and release from electron traps and the improved electron-hole separation efficiency, the designed round-the-clock photocatalyst exhibits the improved hydrogen production from 153.8 μmol g −1 h −1 to 560 μmol g −1 h −1 under visible-light irradiation, infrared-light-driven H 2 production of 932 μmol g −1 for 3 h and a dark activity of 269.1 μmol g −1 h −1 lasing for 0.5 h. This work provides a promising strategy for designing a highly efficient photocatalyst for wide-spectral-responsive and all-weather photocatalytic hydrogen production.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
·
IF 4.6
Yuhan Yang,Lin Liu,Jiao Yu,Yang Zhang,Yuanyue Lu,Yong Mei,Yingying Gu
Heavy metal contamination, especially Pb 2+ and Cd 2+ , poses severe risks to food safety and human health, creating an urgent need for rapid and sensitive detection methods. Herein, a novel tin-based electrochemical sensor with graphitic carbon nitride (g-C 3 N 4 ) and multi-walled carbon nanotubes (MWCNTs) modified glassy carbon electrode (GCE) was developed for the simultaneous detection of Pb 2+ and Cd 2+ in vegetables. The SnO 2 /g-C 3 N 4 @MWCNTs/GCE was systematically characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR). The synergistic effect of the g-C 3 N 4 @MWCNTs composite and the SnO 2 film effectively facilitated electron transfer and accelerated the response, enhancing sensing performance. Under optimal conditions, the linear range of the sensor for Pb 2+ and Cd 2+ was 10–400 μg·L −1 . The limits of detection (LODs) were 0.40 μg·L −1 and 0.61 μg·L −1 for Pb 2+ and Cd 2+ , respectively. In vegetable samples, the recoveries of Pb 2+ and Cd 2+ in spinach, lettuce, and cabbage were all within the range of 95–105 %. This study provides a new method to quickly, sensitively, and simultaneously detect Pb 2+ and Cd 2+ in vegetables. These findings expand the application of environmentally friendly tin-based electrochemical sensors for actual sample detection.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 6
·1-11
·
IF 5.3
Zhang Hui,Ji Yahui,You Nana,Hu Xiaoping,Chen Feifei,Wang Fei,Liu Gen
Ratiometric electrochemiluminescence (ECL) assays have attracted widespread attention in biosensing owing to their precise measurements by eliminating environmental interferences. In this work, g-C 3 N 4 , gold nanoparticles, CuO and luminol were integrated onto hollow carbon spheres (HCS) in sequence to fabricate potential-resolved ECL nanoprobes. The system consists of g-C 3 N 4 as cathode ECL emitters and luminol as anode ECL emitters. The ECL of g-C 3 N 4 is quenched by CuO due to the resonance energy transfer (RET). However, after adding dopamine (DA), the ECL signal is restored due to the redox reaction between CuO and DA. Meanwhile, there is a quenching effect between DA and luminol because DA interferes with the radical reaction process of luminol. Therefore, DA causes the reciprocal changes in cathodic ECL and anodic ECL. This phenomenon can be leveraged to create a ratiometric ECL signal, enabling the quantitative detection of DA. The developed ECL sensor exhibited a sensitive detection toward DA, performing a wide linearity in the range 5.0 × 10 –4 ~ 1.0 × 10 –9 M with a low detection limit of 2.3 × 10 –11 M (S/N = 3). Furthermore, this strategy exhibited a good practicality to detect DA in human urine, providing a promising strategy in ECL bioanalysis. Graphical abstract
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Catalysts
·
2025
·Vol. 15
·期 7
·637
·
IF 4
Feiya Xu,Yajun Ji,Lu Yu,Mengjie Ma,Dingcan Ma,Junguo Wei
The sludge pyrolysis technology for biochar production delivers dual environmental benefits, addressing both sludge disposal challenges and enabling environmental remediation through the utilization of the resultant biochar. However, the complex multi-step procedures and low catalyst output in previous studies constrain the practical implementation of this technology. A facile sludge pyrolysis method was constructed to achieve the batch production of municipal sludge biochar (MSB) in this study. Compared to municipal sludge (MS), the resultant MSB showed a higher BET surface area, more well-developed pore channel architecture, and plentiful active sites for activating peroxymonosulfate (PMS). Under the optimized conditions (CMSB=CPMS= 0.2 g/L), 93.34% of Acid Red G (ARG, 20 mg/L) was degraded after 10 min, posing an excellent rate constant of 0.278 min−1. Additionally, MSB demonstrated excellent broad pH adaptability, ion interference resistance, reusability, and recyclability for ARG elimination. It was primary Fe sites that excited PMS to generateO2•−and Fe-oxo species (FeIV=O) for ARG degradation. The reaction process exhibited minimal heavy metal leaching, indicating limited environmental risk. Therefore, the practical applicability of the sludge biochar production, coupled with its scalable manufacturing capacity and exceptional catalytic activity, collectively demonstrated that this study established a viable pyrolysis methodology for municipal sludge, offering critical insights for sludge disposal and resource reutilization.
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Nanomaterials
·
2025
·Vol. 15
·期 14
·1131
·
IF 4.3
Xing Wei,Gaopeng Jia,Ru Chen,Yalong Zhang
In this study, the BPTCD/g-C3N4heterojunction photocatalyst was successfully prepared by the hydrothermal method. BPTCD (3,3′,4,4′-benzophenone tetracarboxylic dianhydride) is immobilised on the surface of g-C3N4by non-covalent π-π stacking. The BPTCD/g-C3N4heterojunction photocatalyst is an all-organic photocatalyst with significantly improved photocatalytic performance compared with g-C3N4. BPTCD/g-C3N4-60% was able to effectively degrade MO solution (10 mg/L) to 99.9% and 82.8% in 60 min under full spectrum and visible light. The TOC measurement results indicate that MO can ultimately be decomposed into H2O and CO2through photocatalytic action. The photodegradation of methyl orange by BPTCD/g-C3N4composite materials under sunlight is mainly attributed to the successful construction of the heterojunction structure and its excellent π-π stacking effect. Superoxide radicals (•O2−) were found to be the main active species, while•OH and h+played a secondary role. The synthesised BPTCD/g-C3N4also showed excellent stability in the activity of photodegradation of MO in wastewater, with the performance remaining above 90% after three cycles. The mechanism of the photocatalytic removal of MO dyes was also investigated by the trap agent experiments. Additionally, BPTCD/g-C3N4-60% demonstrated exceptional photodegradation performance in the degradation of methylene blue (MB). BPTCD/g-C3N4heterojunctions have great potential to degrade organic pollutants in wastewater under solar irradiation conditions.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Jiayi Wang,Penggang Ren,Ying Zhang,Zihang Cai,Zhengyan Chen,Yanling Jin,Zhengzheng Guo
BiOI is a promising photocatalyst due to its exceptional visible light response and high absorption coefficient; however, its performance is hindered by the rapid recombination of electron-hole (e − -h + ) pairs. Herein, a 2D/3D BiOI/g-C 3 N 4 S-scheme heterojunction catalyst was designed and constructed through the alkali etching strategy and subsequent microwave-assisted hydrothermal strategy. The abundant surface active sites and matched band gap of g-C 3 N 4 prepared through alkali etching facilitates anchoring of BiOI nanosheets, contact with contaminants and construction of heterojunctions. 2D/3D S-scheme heterojunction substantially promote electron-hole (e − -h + ) pairs separation and transfer. Profited from their synergistic effects, the 2D/3D BiOI/g-C 3 N 4 heterojunction delivers superior photocatalytic activity toward four different types of pollutants: methylene blue (91.7 %), tetracycline (91.9 %), eosin y (90.9 %) and methyl orange (97.7 %), and demonstrates excellent cyclic stability after seven methylene blue cyclic degradation experiments. Furthermore, BiOI/g-C 3 N 4 has shown satisfactory practicability in many simulation experiments, such as coexisting cations, different pH and real water. A feasible strategy to prepare a visible-light-driven multidimensional coordinated S-scheme heterojunction photocatalyst is provided in this work.
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BIOORGANIC CHEMISTRY
·
2020
·
IF 4.831
Qiong Wu,Yue Song,Ruotong Liu,Rui Wang,Wenjie Mei,Weiming Chen,Huanglan Yang,Xicheng Wang
Phenanthroimidazole derivatives containing phenanthroline and imidazole heterocyclic aromatic rings are effective agents to inhibit tumor cell growth. Herein, halogen element-modified imidazo[4,5 f ][1,10]phenanthroline derivatives 1–6 ( 1 , 4-fluorophenyl; 2 , 4-chlorophenyl; 3 , 4-bromobenyl; 4 , 2,3-dichlorophenyl; 5 , 3,4-dichlorophenyl; and 6 , 2,4-dichlorophenyl) were synthesized, and their antitumor activities were investigated. All of the compounds, especially 4 , exhibited an excellent inhibitory effect against nasopharyngeal carcinoma CNE-1 cells. This effect was better than that of doxorubicin. Compound 4 also markedly blocked the proliferation of the CNE-1 cells in a zebrafish xenograft model. The antitumor mechanisms might be attributed to apoptosis induction, which triggered ROS-mediated DNA damage and generated mitochondrial dysfunction by stabilizing c-myc G-quadruplex DNA structure. Results indicated that phenanthroimidazole derivatives could act as promising anticancer agents.
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RSC Advances
·
2021
·Vol. 11
·期 45
·28008-28013
·
IF 3.361
Congcong Gao,Baoquan Che,Hong Dai
EcoRI is an important biomacromolecule in live cells and protects bacterial cells against foreign DNA. In this work, we developed a simple and convenient G-triplex (G3) (5′-TGGGAAGGGAGGGAATTCCCT-3′)-based colorimetric assay for the rapid and selective detection of EcoRI activity and inhibition. The sequence specifically responds to EcoRI in the presence of K+ and hemin to form a G-triplex/hemin complex. Taking advantage of G-triplex, EcoRI activity was investigated under the optimized conditions. The absorption intensity ratio displayed a linear relationship against the concentration of EcoRI in the range 0 to 100 U mL−1, and the detection limit was 5.7 U mL−1. Furthermore, G3 showed good selectivity, and the ability to be used to screen for EcoRI inhibitors, indicating its potential in detection and analysis applications.
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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.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3325-3332
·
IF 4.58
Ji Danyang,Meng Hongmin,Ge Jia,Zhang Lin,Wang Hongqi,Bai Dongmei,Li Jianjun,Qu Lingbo,Li Zhaohui
The authors describe a silver(I) mediated fluorescent assay for glutathione (GSH). An allosteric oligonucleotide strand containing a G-rich sequence is used to produce a G-quadruplex, and N-methylmesoporphyrin IX (NMM) is chosen as the fluorescent probe. In the absence of Ag(I), the DNA strand is partially intramolecularly hybridized to form a hairpin structure wherein the G-rich sequence is partially caged. On addition of Ag(I), the hairpin is disrupted by forming C-Ag(I)-C base pairs. As a result, the G-rich sequence is released and folds into a G-quadruplex structure, which is able to bind NMM to generate strong fluorescence at 612 nm. However, in the presence of GSH, due to the strong binding ability between GSH and Ag(I), the C-Ag(I)-C structure is not formed. Hence, the DNA probe reverts back to its original structure and fluorescence is not increased. Based on these findings, a method was worked out that has a detection limit as low as 3.5 nM. Due to the inherent selectivity of the interaction between GSH and Ag(I), the method is highly selective over common potential interfering species. It was successfully applied to the fluorometric determination of GSH in cell extracts.
Schematic of a highly sensitive fluorometric glutathione (GSH) assay based on a conformational switch of a G-quadruplex mediated by silver(I) and N-methylmesoporphyrin IX (NMM) as a signal reporter.
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