CHEMOSPHERE
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2022
·
IF 8.943
Bingzhi Yu,Wen Yan,Yunjuan Meng,Yinan Zhang,Xizi Li,Yan Li,Yuchi Zhong,Jiafeng Ding,Hangjun Zhang
Environmental-friendly and efficient strategies for triclosan (TCS) removal have received more attention. Influenced by COVID-19, a large amount of TCS contaminants were accumulated in medical and domestic wastewater discharges. In this study, a unique g-C 3 N 4 /Bi 2 MoO 6 heterostructure was fabricated and optimized by a novel and simple method for superb photocatalytic dechlorination of TCS into 2-phenoxyphenol (2-PP) under visible light irradiation. The as-prepared samples were characterized and analyzed by XRD, BET, SEM, XPS, etc. The rationally designed g-C 3 N 4 /Bi 2 MoO 6 (4:6) catalyst exhibited notably photocatalytic activity in that more than 95.5% of TCS was transformed at 180 min, which was 3.6 times higher than that of pure g-C 3 N 4 powder. This catalyst promotes efficient photocatalytic electron-hole separation for efficient dechlorination by photocatalytic reduction. The samples exhibited high recyclable ability and the dechlorination pathway was clear. The results of Density Functional Theory calculations displayed the TCS dechlorination selectivity has different mechanisms and hydrogen substitution may be more favorable than hydrogen abstraction in the TCS dechlorination hydrogen transfer process. This work will provide an experimental and theoretical basis for designing high-performance photocatalysts to construct the systems of efficient and safe visible photocatalytic reduction of aromatic chlorinated pollutants, such as TCS in dechlorinated waters.
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高影响因子
CARBON
·
2022
·
IF 11.307
Hui Cao,Yumeng Yan,Yuan Wang,Fei-Fei Chen,Yan Yu
The activity of photocatalytic CO 2 reduction (PCR) remains inadequate due to the thermodynamically stable CO 2 molecules and sluggish carrier kinetics. This work simultaneously adopts active site and heterojunction engineering to collaboratively enhance PCR. A heterojunction of g-C 3 N 4 microtube-supported Co 3 O 4 nanoparticle has been developed through the hydrothermal pretreatment and calcination processes. The g-C 3 N 4 microtubes play dual roles in enhancing PCR of Co 3 O 4 : (1) they act as a substrate to support Co 3 O 4 nanoparticles, thereby making small size and good dispersion of Co 3 O 4 nanoparticles. The Co active sites can be highly exposed to accept photogenerated electrons and capture CO 2 molecules; and (2) the p-type Co 3 O 4 nanoparticles and n-type g-C 3 N 4 microtubes build a p–n junction. An internal electric field is created to expedite the charge transfer. As a result, the g-C 3 N 4 microtube-supported Co 3 O 4 nanoparticle affords a significantly high turnover number (TON) of 24.72, which is 24-fold higher than that of the pure Co 3 O 4 and comparable to state-of-the-art photocatalysts .
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JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Jinyan Du,Na Xu,Pingchuan Yuan,Qin Shu,Chaofeng Wang,Qidi Xu,Ping Zhang,Shujuan Zhuo,Changqing Zhu
Using ammonium chloride (NH 4 Cl) as a gas template, we conveniently fabricated ultrathin two-dimensional layered silver-embedded graphitic carbon nitride nanosheets (AgCNS) by melamine blowing method with triazine groups of pristine graphite carbon nitride. Compared with bulk g-C 3 N 4 (BCN) and g-C 3 N 4 nanosheets (CNS), the antibacterial activity of the optimized AgCNS-5 at a minimum inhibitory concentration (MIC) of 40 ppm against Escherichia coli ( E. coli ) was significantly enhanced. Under visible-light irradiation, E. coli could be completely killed by 100 µg·mL −1 of AgCNS-5 within 30 min. The mechanism of enhanced antibacterial activity was systematically investigated by ultraviolet-visible diffuse reflectance spectra (UV-vis DRS), photoluminescence spectra (PL), electrochemical impedance spectroscopy (EIS), and photogenerated current densities. Surface plasmonic resonance (SPR) of Ag nanoparticles (NPs) with g-C 3 N 4 was found to lead to an enhancement of visible light absorption and an acceleration of photo-induced electron-hole migration/separation, which is responsible for the enhanced photocatalytic bactericidal performance. Through trapping experiments and electron spin resonance spectroscopy (ESR) techniques, the bactericidal mechanism was revealed that the species of •O 2 − and •OH play important roles in antibacterial process. Considering the facile preparation and excellent performance, AgCNS-5 may be a promising and competitive visible-light-driven candidate toward sterilizing agent.
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International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 5
·813-823
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IF 4.8
Xu Ruijing,Zou Wenjie,Rao Bo,Zhao Wei,Wang Ting,Zhang Zhijun
This study presents a comparative study of the flocculation behavior of kaolinite induced by chitosan-graft-poly(acrylamide-dimethyl diallyl ammonium chloride) (Chi-g-CPAM) and a commercial cationic polyacrylamide (CPAM). The flocculation behaviour was characterised in terms of both flocculation kinetics and the corresponding morphology changes during flocculation. Both Chi-g-CPAM and CPAM were grafted from silica wafers by means of atom transfer radical polymerization (ATRP). The quartz crystal microbalance with dissipation (QCM-D) tests were conducted. The equilibrium time flocculated by Chi-g-CPAM was found to be 0.46 times as that of CPAM, together with a larger total mass of kaolinite layer. The flocculation behaviour by Chi-g-CPAM can be well captured by a pseudo-first-order model. In contrast, the presence of CPAM leads to a more complex kinetics. A relatively larger fitting slope (0.4663) was obtained at the initial stage but the fitting slope droped to 0.2026 after 800 min, indicating a densification process caused by CPAM. The flocculation kinetics of CPAM can be captured by the Elovich model for the inital stage but the combination of pseudo-first-order and pseudo-second-order models for the latter stages, which can be attributed to the long chain of CPAM. With a dosage of 75 g/t, the settling test with Chi-g-CPAM exhibits the same turbidity in the supernatant but a smaller layer thickness of the settlement compared to CPAM. The study enables a better understanding of the flocculation behavior and contributes to the development of efficient flocculants in mineral processing and tailings treatment.
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高影响因子
GENOME BIOLOGY
·
2022
·Vol. 23
·期 1
·1-29
·
IF 17.906
Li Conghui,Yin Zhinang,Xiao Ruijing,Huang Beili,Cui Yali,Wang Honghong,Xiang Ying,Wang Lingrui,Lei Lingyu,Ye Jiaqin,Li Tianyu,Zhong Youquan,Guo Fangteng,Xia Yuchen,Fang Pingping,Liang Kaiwei
Background G-quadruplexes (G4s) are unique noncanonical nucleic acid secondary structures, which have been proposed to physically interact with transcription factors and chromatin remodelers to regulate cell type-specific transcriptome and shape chromatin landscapes.Results Based on the direct interaction between G4 and natural porphyrins, we establish genome-wide approaches to profile where the iron-liganded porphyrin hemin can bind in the chromatin. Hemin promotes genome-wide G4 formation, impairs transcription initiation, and alters chromatin landscapes, including decreased H3K27ac and H3K4me3 modifications at promoters. Interestingly, G4 status is not involved in the canonical hemin-BACH1-NRF2-mediated enhancer activation process, highlighting an unprecedented G4-dependent mechanism for metabolic regulation of transcription. Furthermore, hemin treatment induces specific gene expression profiles in hepatocytes, underscoring the in vivo potential for metabolic control of gene transcription by porphyrins.Conclusion sThese studies demonstrate that G4 functions as a sensor for natural porphyrin metabolites in cells, revealing a G4-dependent mechanism for metabolic regulation of gene transcription and chromatin landscapes, which will deepen our knowledge of G4 biology and the contribution of cellular metabolites to gene regulation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ziqi Cao,Di Sun,Hai Hu,Wenxin Li,Ziying Xiong,Maofen He,Shuqi Cai,Yan Fan,Lulu Zheng,Shifei Kang
The exclusive Fenton activity of iron ions has initiated wide investigation into tumor microenvironment-activated tumor therapy owing to the production of toxic ·OH and extra oxygen for chemodynamic therapy (CDT) and photodynamic therapy (PDT) respectively. However, the sensitivity of the labile iron pool (LIP) is unsatisfactory even when iron ions are placed in the tumor microenvironment. Herein, we constructed ferrous oxalate (FeC 2 O 4 ) self-assembled nanorods loaded with a graphitic carbon nitride (g-C 3 N 4 ) photo-Fenton catalyst, which can catalyze H 2 O 2 to continuously generate abundant ·OH under visible light irradiation. The FeC 2 O 4 self-assembled nanorods also dramatically accelerated O 2 production (catalase activity) to improve the PDT of C 3 N 4 . Furthermore, the photo-Fenton catalyst under excitation also open ion channels and release free iron to increase LIP to exploit the joint CDT and PDT. Characterizations proved the self-assembled nanorods outperformed conventional Fenton catalysts in terms of stability, photoelectric response performance and photo-Fenton catalytic ability, which can be ascribed to the optimized band structure and charge isolating capability. Remarkably, the self-assembled nanorods coated with g-C 3 N 4 also showed excellent biocompatibility during the fluorescence tracing cell phagocytosis experiment, suggesting great in-vivo application potential. The results of enhanced generation of reactive oxygen species, reduction of glutathione, consumption of lipid peroxidation, and reduced cell viability verified the typical ferroptosis mechanism of the FeC 2 O 4 /g-C 3 N 4 self-assemble system as-developed. These results demonstrate the great potential of the biocompatible self-assembly photo-Fenton system for rational control of tumor behaviors.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
·
IF 4.3
Jingya Ding,Yaqin Lou,Guomeng Dong,Yiwei Zhang
Photocatalytic hydrogen production promisingly mitigates and ameliorates the status quo of energy shortage and decarbonization of the energy supply. Given this, a photocatalyst was prepared by modifying spongy g-C 3 N 4 with covalent organic frameworks (COFs). As an electron acceptor with a large specific surface, COFs can trap more transition electrons, leading to an increase in the photogenerated carriers involved in the surface reaction and increasing the active sites of the photocatalyst. The S-scheme heterojunction structure formed in g-C 3 N 4 /COFs composite catalyst triggers a decrease in the recombination rate of photogenerated electron-hole pairs as well as an increase in photogenerated electrons. The photocatalytic hydrogen production rate reached the maximum value of 7788.10 μmol·h −1 ·g −1 , almost 7 times that of g-C 3 N 4 . The AQE of the catalyst reached 29.6 %. The electron transfer path from g-C 3 N 4 to COFs was verified by density functional theory (DFT) calculation.
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高影响因子
ACS Applied Energy Materials
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2022
·
IF 6.959
Yuping Che,Bingxin Lu,Huaxiang Chen,Jin Zhai,Kefeng Wang,Huaiqiu Chang,Zhaoyue Liu
Adding a cocatalyst to a semiconductor catalyst is often considered an effective measure to increase the efficiency of the photocatalytic hydrogen evolution reaction. Nowadays, noble metals are the state-of-the-art cocatalysts for the hydrogen evolution reaction. Due to their high cost and scarcity, it is imperative to develop cocatalysts prepared from cheap and abundant elements. Here, RuSe2 was used as an effective substitute for precious metal promoters such as Pt to enhance the efficiency of g-C3N4 for the hydrogen evolution reaction. A high efficiency of 13417.3 μmol·g–1·h–1 was obtained. It was 214 times higher than that of g-C3N4 and 2.8 times higher than that of 3%Pt/g-C3N4. Density functional theory calculations were performed. The (210) and (200) crystal faces of RuSe2 showed lower ΔGH* than Pt(111), indicating higher hydrogen evolution efficiency. Compared with the Pt cocatalyst, metallic RuSe2 cocatalysts exhibited superior performance. Meanwhile, the electrocatalytic activity was also investigated in an alkaline medium. It showed a decent electrocatalytic activity and high stability. These findings might provide a prototype to develop cheap and efficient cocatalysts for large-scale water splitting.
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高影响因子
Polymers
·
2022
·Vol. 14
·期 9
·1917
·
IF 4.967
Fue Ren,Shuyan Yang,Yang Wu,Feng Guo,Feng Zhou
An ultra-low friction and high load capacity could be obtained on the surfaces grafted by a polymer brush even at relatively slow friction speeds in aqueous lubrication environments, which has attracted widespread attention to study the lubrication mechanism of polymer brushes; however, it has yet to be fully understood. The macroscopic tribological performance of two different polymer brushes, which were prepared by the method of “grafting to” and “grafting from” and named as PLL-g-PEG and PSPMA, respectively, were investigated. The friction results demonstrated that PLL-g-PEG obtained a lower friction coefficient than polymer brush PSPMA, which was ascribed to its unique “self-healing” behavior. The lubrication film was in situ observed and the film thickness induced by the polymer brush was measured using a laboratory set for film thickness measurement apparatus based on interference technology. It was found that PSPMA exhibited excellent lubrication performance not found in PLL-g-PEG, and two film-forming mechanisms highly dependent on velocity were revealed, which may be important to interpret the lubrication mechanism of polymer brushes in aqueous lubricants.Keywords:PLL-g-PEG brushes;PSPMA brushes;friction;film formation property;hydration effect;hydrodynamic effect;lubrication mechanism
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高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Le Thi Thao,To Van Nguyen,Van Quy Nguyen,Ngoc Man Phan,Ki Jae Kim,Nguyen Nhat Huy,Nguyen Trung Dung
Wastewater containing an azo dye Orange G (OG) causes massive environmental pollution , thus it is critical to develop a highly effective, environmental-friendly, and reusable catalyst in peroxymonosulfate (PMS) activation for OG degradation. In this work, we successfully applied a magnetic MnFe 2 O 4 /α-MnO 2 hybrid fabricated by a simple hydrothermal method for OG removal in water. The characteristics of the hybrid were investigated by X-ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Fourier transform infrared spectroscopy , Brunauer–Emmett–Teller method, vibrating sample magnetometry, electron paramagnetic resonance, thermogravimetric analysis , and X-ray photoelectron spectroscopy. The effects of operational parameters (i.e., catalytic system, catalytic dose, solution pH, and temperature) were investigated. The results exhibited that 96.8% of OG degradation was obtained with MnFe 2 O 4 /α-MnO 2 (1:9)/PMS system in 30 min regardless of solution pH changes. Furthermore, the possible reaction mechanism of the coupling system was proposed, and the degradation intermediates of OG were identified by mass spectroscopy . The radical quenching experiments and EPR tests demonstrated that SO 4 • ̶ , O 2 • ̶ , and 1 O 2 were the primary reactive oxygen species responsible for the OG degradation. The hybrid also displayed unusual stability with less than 30% loss in the OG removal after four sequential cycles. Overall, magnetic MnFe 2 O 4 /α-MnO 2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater.
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高影响因子
Journal of Analytical Methods in Chemistry
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2022
·
IF 2.594
Yanling Zhao,Yanfei Wen,Xing Hu,Bing Zhang
We proposed a colorimetric immunosensor based on g-C3N4@Fe3O4 nanocomposite-mediated transformation strategy for sensitive detection of carcinoembryonic antigen (CEA). The g-C3N4@Fe3O4 nanocomposite was synthesized and characterized by the scanning electron microscope (SEM), energy dispersive X-ray spectra (EDX), X-ray powder diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Fe3+ derived from g-C3N4@Fe3O4 nanocomposite could combine with sodium salicylate to form purple complex products. Based on this color development, the sandwich colorimetric immunoassay was built by utilizing g-C3N4@Fe3O4 nanocomposite as nanolabels on the microplate. With the increasement of CEA concentration, the purple color showed a gradient change. Under optimal conditions, the linearity range is 0.001–50 ng/mL with the detection limit of 0.35 pg/mL for CEA. More importantly, the colorimetric immunoassay has good selectivity, specificity, repeatability, and stability.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 18
·8644-8652
·
IF 3.925
Minpeng Zhang,Huitong Xu,Lei Wu,Yu Tan,Dezhi Kong,Mamatjan Yimiti
As the most abundant renewable aromatic resource, the catalytic depolymerization of lignin to obtain high value-added aromatics is very attractive but full of challenges. Photocatalysis is a promising approach in this case. In this research, calcination and solvothermal procedures were used to make TiO2/g-C3N4 heterojunction composites, and XRD, SEM, and TEM characterization methods were used to investigate the structural and morphological properties of TiO2/g-C3N4. Photoluminescence and photoelectrochemical measurements were conducted to confirm the evidence of efficient charge carrier separation by nano-composites. TiO2/g-C3N4 doped with 10 mg of g-C3N4 had the best efficacy under simulated sunshine irradiation, with lignin degradation reaching 75%, which was twice as effective as pure TiO2. Lignin was successfully reduced into tiny molecules, thus according to GC–MS analysis, and TiO2/g-C3N4 showed good application possibilities in the catalytic degradation of lignin. The radical trapping and electron spin resonance outcomes supported the role of oxidative active species and its interaction in the degradation of lignin. The likely mechanism of the photocatalytic reaction was hypothesized, the degradation products were studied, and the various pathways of lignin degradation were addressed based on the experimental data.
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