JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Hao Cheng,Niuniu Wang,Yongqiang Yang,Xiong Jiao,Peide Han,Wangping Duan,Di Huang,Meiwen An,Weiyi Chen,Xiaohong Yao,Xiangyu Zhang
Graphitic carbon nitride (g-C 3 N 4 ) has received much attention as a metal-free polymeric two-dimensional photocatalyst for antibiotic-free antibacterial application. However, the weak photocatalytic antibacterial activity of pure g-C 3 N 4 stimulated by visible light limits its applications. Herein, g-C 3 N 4 is modified with Zinc (II) meso -tetrakis (4-carboxyphenyl) porphyrin (ZnTCPP) by amidation reaction to enhance the utilization of visible light and reduce the recombination of electron-hole pairs. The composite (ZP/CN) is used to treat bacterial infection under visible light irradiation with a high efficacy of 99.99% within 10 min due to the enhanced photocatalytic activity. Ultraviolet photoelectron spectroscopy and density flooding theory calculations indicate the excellent electrical conductivity between the interface of ZnTCPP and g-C 3 N 4 . The formed built-in electric field is responsible for the high visible photocatalytic performance of ZP/CN. In vitro and in vivo tests have demonstrated that ZP/CN not only possesses excellent antibacterial activity upon visible light irradiation, but also facilitates the angiogenesis. In addition, ZP/CN also suppresses the inflammatory response. Therefore, this inorganic–organic material can serve as a promising platform for effective healing of bacteria-infected wounds.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
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IF 3.3
Xu Zhang,Zeyu Song,Xiaochen Yu,Xiaoqian Dong,Yadi Peng,Kexin Wei,Leichao Cao,Xiao He,Zhehan Zhang,Jibin Fan
A heterostructured MIL-101(Fe)/Ce/g-C 3 N 4 (MCCN) composite was designed and synthesized by solvothermal method . The composite was characterized by XRD , SEM, EDS , FT-IR, BET, XPS , UV–Vis DRS , PL and EIS. The MCCN photocatalyst exhibits superior photocatalytic performance for the degradation of rhodamine B (RhB) and methylene blue (MB), and the efficiencies are found to be 90.36% and 88.17%, respectively. The kinetic constants k of MCCN-3 against RhB and MB dyes are 0.04094 min −1 and 0.03319 min −1 , respectively, under visible light for 75 min irradiation. The improved degradation efficiency of MCCN attributed to the enhanced light absorption and the transport channels of electron-hole pairs by forming a heterojunction between MIL-101(Fe) and Ce/g-C 3 N 4 with a favourable band position. Moreover, the possible mechanism of photocatalytic degradation of dyes was proposed though free radical trapping experiments. This work provides an effective way for constructing novel visible-light-driven photocatalyst in the removal of organic molecules from waste water .
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Materials Today Chemistry
·
2023
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IF 7.3
S. Gong,W. Lu,W. Zhang,Y. Zhang,T. Gan,H. Hu,Z. Huang
Poor visible light (VSL) absorption capacity and severe photogenerated carrier recombination rate are the two major problems limiting the application of g-C 3 N 4 (CN). In this work, a novel 2D/1D Bi 2 O 2 Se/tubular g-C 3 N 4 (TCN) Schottky junction photocatalyst was prepared by combining 2D Bi 2 O 2 Se with TCN at room temperature. The degradation rate of tetracycline hydrochloride (TCH) catalyzed by 5% Bi 2 O 2 Se/TCN composite was 85.3% within 30 min under VSL illumination, and the degradation kinetic constant reached 0.0570 min −1 , which was 9.6, 3.3, and 21.9 times higher than those of CN (0.0059 min −1 ), TCN (0.0173 min −1 ), and Bi 2 O 2 Se (0.0026 min −1 ), respectively. When 2D Bi 2 O 2 Se was combined with TCN as a cocatalyst, the Schottky junction was formed at the interface, which could efficiently transfer the photogenerated electrons in TCN to Bi 2 O 2 Se for enhancing photocarriers separation. In addition, Bi 2 O 2 Se enhanced the VSL light absorption performance of TCN. The main active species produced by Bi 2 O 2 Se/TCN under VSL illumination were h + and •O 2 − . Based on the results of LC-MS, a new degradation path of TCH catalyzed by Bi 2 O 2 Se/TCN was proposed. Therefore, this work proposed a novel Bi 2 O 2 Se/TCN Schottky junction photocatalyst for highly efficient removal of TCH.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Jun Chen,Boding Zhang,Bingxing Wang,Chengxing Cui,Songlin Wang,Jichao Wang,Wenlong Zhang
With high toxicity, carcinogenicity and teratogenicity, quinoline has been threatening human health and ecological environment. Herein, Fe-Co-Ni-P/g-C 3 N 4 particles are developed as electrochemical reactors to form a three-dimensional catalytic particle electrode system (3D-CPE) for efficient removal of quinoline from wastewater by electro-Fenton (EF) oxidation process. with reaction time of 30 min, the particles dosage of 50 g/L, pH of 3, conductivity of 11.5 ms/cm, and current density of 37.04 mA/cm 2 , the chemical oxygen demand (COD) removal rate can up to 90.95%. In addition, electron paramagnetic response (EPR) and radical scavenging tests are performed to determine the hydroxyl radicals of electrochemical processes produced. The degradation products are analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS). Finally, through theoretical calculation and analysis of degradation products, a reasonable degradation mechanism is proposed.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Lijie Chen,Yuan Gao,Junjie Lian,Le Li,Dexin Ding,Zhongran Dai
Photocatalytic reduction of soluble hexavalent uranium to insoluble tetravalent uranium is a promising strategy for uranium-containing wastewater treatment, while this method generally requires anaerobic conditions and/or the addition of sacrificial agents. Obviously, providing anaerobic environment and sacrificial agent will not only increase the cost but also causes secondary pollution. Thus, efficient removal of U(VI) by photocatalytic techniques under air atmosphere without sacrificial agents is an urgent task and great challenge. In this work, a novel O, K co-doped g-C 3 N 4 (OKDCN) photocatalyst was synthesized by a simple thermal reaction for the photoreduction removal of U(VI) under air atmosphere without sacrificial agents. Batch experiments show that the OKDCN-2 can nearly completely remove U(VI) in the solution within 120 min at pH 5.0. In addition, the OKDCN showed excellent reusability and selectivity in the process of photocatalytic reduction of U(VI). Further mechanism studies show the doping of O and K can improve the photogenerated carrier transfer and separation efficiency of OKDCN, and then improve the performance of photocatalytic reduction of uranium. These results provide a reference for breaking through some bottleneck issues in the research field of photocatalytic removal of U(VI).
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Catalysts
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2022
·Vol. 12
·期 12
·1583
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IF 4.501
Ximiao Zhu,Fan Yang,Jinhua Liu,Guangying Zhou,Dongdong Chen,Zhang Liu,Jianzhang Fang
A novel phosphorus and oxygen co-doped graphitic carbon nitride (sheetP-O-CNSSA) photocatalyst was successfully synthesized and applied for H2evolution under visible light. In the synthesis process ofsheetP-O-CNSSA, the supramolecular complex was developed by the self-assembly and copolymerization reaction among melamine, cyanuric acid (CA) and trithiocyanuric acid (TCA) to act as g-C3N4precursors, while (NH4)2HPO4was applied as P and O precursors for element doping. The chemical structures, morphologies, and optical properties of thesheetP-O-CNSSAwere characterized by a series of measurements, i.e., XRD, FT-IR, SEM, TEM, UV-vis DRS, and PL. The results suggested that the introduction of P and O elements could enhance the separation and migration efficiency of photogenerated electrons and holes in the energy band of g-C3N4. The photocatalytic tests over Erythrosin B (EB) sensitizedsheetP-O-CNSSAindicated that the hydrogen evolution was greatly enhanced compared with other catalysts and non-sensitizedsheetP-O-CNSSAunder visible light irradiation. Finally, a possible dye-sensitized photocatalysis mechanism was also proposed on the basis of the as-obtained results.Keywords:P-O-co-doped g-C3N4;self-assembly;dye sensitization;hydrogen evolution
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Junnan Wang,Minqiang Wang,Jindou Shi,Yun Zhou,Chen Zhang,Arshad Saleem Bhatti
Flexibility and self-cleaning are the main research hot-spots in the development of plasma substrates for practical applications in Surface-enhanced Raman scattering (SERS) at present. In this study, a flexible composite Au@Ag/ultrathin g-C 3 N 4 /Graphene (AUG) film based on PDMS film was reported and used as a highly sensitive SERS substrate for the detection of rhodamine 6G (R6G) molecules. The Au@Ag nanosphere array formed by self-assembly provided dense hot-spots, the ultrathin g-C 3 N 4 enabled the composite to possess excellent photocatalytic ability, and the graphene enhanced SERS detection and photocatalytic performance while improving the stability of the composite film . The results showed that the AUG flexible composite film had a detection limit of 10 −12 M for R6G molecules. After 10 photocatalytic cycles of testing, the composite film maintained 83 % of SERS activity. Benefiting from the graphene covering the surface, the composite films showed only a 5 % decrease in SERS detection performance after 30 days of storage in air. The facile fabrication process of AUG composite film enables it to be an outstanding candidate for the flexible, inexpensive, and stable wearable SERS sensing systems.
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VACUUM
·
2022
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IF 4.11
Dafeng Gao,Dayi Jiao,Fuming Chen,Yuheng Liang,Yinzhen Wang,Guannan He,Wei Li,Qinyu He
In this study, SnS 2 /S-doped g-C 3 N 4 (Sg-C 3 N 4 ) composite with SnS 2 and Sg-C 3 N 4 in the weight ratio of 9:1 was prepared by a hydrothermal method . For comparison, composites of SnS 2 /Sg-C 3 N 4 with weight ratios of 9:0.05 and 9:1.5, pure SnS 2 , Sg-C 3 N 4 , and g-C 3 N 4 were also prepared using the same processing parameters. Microstructural characterization showed that nano-sized SnS 2 particles were deposited on Sg-C 3 N 4 to form a Z-scheme photocatalyst . The chemical valence of the doped S in Sg-C 3 N 4 was +6, allowing the surface of Sg-C 3 N 4 in the composite to be considerably uneven for the deposition of SnS 2 . The uneven surface of Sg-C 3 N 4 resulted in a rough surface of the SnS 2 /Sg-C 3 N 4 composite, which significantly enhanced the specific surface area and light absorption over a wide wavelength range of 200–1000 nm. The carrier transfer capability and lifetime of g-C 3 N 4 were improved after S doping. The lifetime and transfer ability of the photoproduced carriers in the composite were improved by the Z-scheme heterojunction . Consequently, the rate constant of the composite is thrice that of pure SnS 2 and 57 times that of Sg-C 3 N 4 . This work demonstrates a novel route to enhance light absorption over a wide wavelength range: depositing a semiconductor on a base semiconductor with an uneven surface charge distribution can produce a composite with a rough surface, i.e., a large specific surface area.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Yi Xu,Waqas Ahmad,Md Mehedi Hassan,Huanhuan Li,Qin Ouyang,Quansheng Chen
A novel g-C 3 N 4 nanosheets (g-C 3 N 4 NSs)-assisted upconversion fluorescent aptasensor was proposed for Staphylococcus aureus ( S. aureus ) detection by adopting hybridization chain reaction (HCR) as a sensitizer. Two hairpin (H1 and H2) structured DNA probes were engineered predicated on the partial complementary sequence (cDNA) of S. aureus aptamer and modified on the exterior of the upconversion nanoparticles (UCNPs), respectively. The presence of S. aureus initiated the HCR system and activated H1 and H2 probes to form a double-helix away from the g-C 3 N 4 NSs vicinity. This led to the decrease in peroxidase-like activity (PA) of the g-C 3 N 4 NSs and corresponding fluorescence recovery proportional to the concentration of S. aureus (10-10 6 cfu mL −1 ). The method was applied to real food samples with acceptable recoveries (91.1–101.6%) and further validated by traditional plate counting method (p > 0.05).
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Jingquan Wang,Weijun Zhang,Huan Wu,Feng Su,Quanyi Dai,Zhanxin Jiang,Chuancai Kong,Zhimao Yang,Tong Wang,Hao Zhu
In this study, multi-morphological g-C 3 N 4 / Fe 2 O 3 were prepared via hydrothermal supramolecular preorganization for the removal of formaldehyde in simulated indoor environments . We synthesized bulk, spherical and tubular g-C 3 N 4 under hydrothermal conditions and subsequently attached Fe 2 O 3 nanoparticles by impregnation method. Tubular g-C 3 N 4 /Fe 2 O 3 (27.46 m 2 /g) and spherical g-C 3 N 4 /Fe 2 O 3 (33.50 m 2 /g) synthesized through hydrothermal supramolecular preorganization method possessed the higher specific surface area than bulk g-C 3 N 4 /Fe 2 O 3 (11.05 m 2 /g). Among three morphologies of g-C 3 N 4 /Fe 2 O 3 , tubular g-C 3 N 4 /Fe 2 O 3 exhibited the best performance (65%) than bulk (41%) and spherical (59%) and possessed favorable stability. In addition, we explored and optimized the effects of different indoor simulation conditions (formaldehyde concentration, relative humidity, light source power) on the photocatalytic removal of formaldehyde. The mechanism was proposed that g-C 3 N 4 /Fe 2 O 3 formed Z-type heterojunction to promote the separation of photo-generated electrons and holes, further generating hydroxyl radical and superoxide radical to oxidize formaldehyde.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Puhui Deng,Chuanjun Xi,Ning Chen,Hongpeng Shi,Linping Zhang,Yu Hou
Loading co-catalysts are an effective strategy to break the confinement of bulk carbon nitride in photocatalysis . Employing this strategy, N-doped g-C 3 N 4 decorated with CoS x was successfully prepared through a photochemical synthesis route. The optimum hydrogen evolution performance of N-CN-CoS x -4 was 1757 μmol g −1 h −1 under visible light irradiation . Superior interfacial carrier transfer properties and improved light absorption of N-CN-CoS x -4 could elucidate its better photocatalytic activity . This research offers a reference for the construction of high-efficiency, stable and low-priced photocatalysts .
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Ke-Ying Tao,Kuo Yuan,Wei Yang,Di-Chang Zhong,Tong-Bu Lu
Photocatalytic CO 2 reduction reaction (CO 2 RR) is an effective mean to address the current environmental and energy issues. As a kind of typical photocatalyst, g-C 3 N 4 possesses lots of advantages (i.e . , facile synthesis, visible-light response, and high stability) in CO 2 reduction. However, the poor capacity of CO 2 capture and rapid recombination of photo-generated electron and hole, both hinder the further development of g-C 3 N 4 for CO 2 RR. Herein, we developed a template co-pyrolysis strategy to prepare C–NH x -rich ( x = 1 or 2) g-C 3 N 4 , to increase the CO 2 binding and the subsequent photocatalytic CO 2 reduction efficiency. Specifically, organic molecules with multiple imino groups were used as additives to co-pyrolyze with urea. These additives can act as templates to facilitate the formation of g-C 3 N 4 with abundant C–NH x groups, which effectively improved the capacity of CO 2 capture. Meanwhile, the capacity of light absorption and the separation of photo-generated electron and hole were also optimized. As a result, the obtained C–NH x -rich g-C 3 N 4 showed greatly enhanced photocatalytic activity for CO 2 RR, over 74-fold higher than that of g-C 3 N 4 conventionally prepared. This work provides a new avenue for optimizing the g-C 3 N 4 -based photocatalysts for CO 2 RR.
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