JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Dong Li,Renyi Li,Yizhou Zhao,Kaixuan Wang,Ke Fan,Wei Guo,Qi Chen,Yujing Li
Perovskite CsPbBr 3 quantum dot shows great potential in artificial photosynthesis, attributed to its outstanding optoelectronic properties. Nevertheless, its photocatalytic activity is hindered by insufficient catalytic active sites and severe charge recombination. In this work, a CsPbBr 3 @Ag-C 3 N 4 ternary heterojunction photocatalyst is designed and synthesized for high-efficiency CO 2 reduction. The CsPbBr 3 quantum dots and Ag nanoparticles are chemically anchored on the surface of g-C 3 N 4 sheets, forming an electron transfer tunnel from CsPbBr 3 quantum dots to Ag nanoparticles via g-C 3 N 4 sheets. The resulting CsPbBr 3 @Ag-C 3 N 4 ternary photocatalyst, with spatial separation of photogenerated carriers, achieves a remarkable conversion rate of 19.49 μmol·g −1 ·h −1 with almost 100 % CO selectivity, a 3.13-fold enhancement in photocatalytic activity as compared to CsPbBr 3 quantum dots. Density functional theory calculations reveal the rapid CO 2 adsorption/activation and the decreased free energy (0.66 eV) of *COOH formation at the interface of Ag nanoparticles and g-C 3 N 4 in contrast to the g-C 3 N 4 , leading to the excellent photocatalytic activity, while the thermodynamically favored CO desorption contributes to the high CO selectivity. This work presents an innovative strategy of constructing perovskite-based photocatalyst by modulating catalyst structure and offers profound insights for efficient CO 2 conversion.
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Reaction Kinetics Mechanisms and Catalysis
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2024
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IF 1.7
Gao Hang,Zhu Yuqin,Luo He’an,Lv Yang,Liu Pingle
Co–xCaO/g-C 3 N 4 catalysts were prepared using incipient wetness impregnation method and applied in isophthalonitrile hydrogenation to M-xylenedimethylamine. The characterization results and experimental data indicate that introduction of CaO crates large number of basic sites and leads to electron rich Co, hence inhibits the side reaction and improves the selectivity to M-xylenedimethylamine. 10Co–2CaO/g-C 3 N 4 gives the best catalytic performance of 100% conversion of isophthalonitrile and 95% selectivity to M-xylenedimethylamine without any alkaline additives in the reacion system. This work is valuable for the design and preparation of hydrogenation catalysts with rich basic sites and provides a green process for nitrile compounds to amine.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jinxiang Dai,Zhixin Liu,Yanyu Song,Yongdi Liu,Long D. Nghiem,Qilin Wang,Wen Liu,Xianbo Sun,Zhengqing Cai
A novel heterocyclic polymerized g-C 3 N 4 nanotube was prepared by thermal polycondensation using urea and 2,4,6-triaminopyrimidine (TAP). The TAP-polymerized g-C 3 N 4 composite with 0.5 wt% TAP content showed the highest photocatalytic activity for ciprofloxacin (CIP) degradation under solar irradiation. The optimal composite derived from urea achieved ∼ 10.8 and ∼ 7.5 time of CIP degradation activity when compared with TAP-polymerized g-C 3 N 4 derived from melamine and thiourea. The copolymerization of TAP molecules reduces the π electron defects in the g-C 3 N 4 conjugated system thus accelerates the migration of photogenerated carriers. The doping of TAP in g-C 3 N 4 reduces its band gap, which enhances the light absorption capacity and improves the utilization efficiency of visible light. The fluffy porous nanotube structure of the material endows it with unique surface morphology and excellent photoelectric characteristic. Electron spin resonance (ESR) and probe technology were used for qualitative or quantitative detection of free radicals in this work. Superoxide radicals ( O 2 · - ) played the major roles in the photodegradation of CIP. Recycling experiments displayed the high stability and activity of the modified materials, which is potentially applicable in practical engineering. Moreover, the photodegradation pathways and mechanisms of CIP were proposed and its toxicity evolution was assessed in this study. This work revealed the specific application of heterocyclic polymerization in modifying g-C 3 N 4 material and provided unique insights for its application in photocatalytic degradation of antibiotic.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yanxia Shen,Haibo Zhu,Liya Deng,Liu Yang,Yajing Shen,Qiangwen Fan,Zhanggao Le,Zongbo Xie
Improving the transmission and separation efficiency of light carriers is considered an effective method to enhance the catalytic performance of semiconductor photocatalysis. Herein, we report the synthesis and application of g-C3N4/Bi2WO6 heterostructure nanosheets for the photocatalytic coupling of thiols to disulfides under visible light irradiation. The heterojunction exhibits significant photocatalytic performance compared to the bare catalyst, which dramatically enhances the separation and transfer of photogenerated charge carriers due to the remarkable hole-trapping ability of g-C3N4. Various functional symmetrical and asymmetrical disulfides have been effectively prepared by employing this heterostructure photocatalytic system, which features excellent photocatalytic activity and cycling stability. The outstanding photocatalytic activity of the semiconductor heterojunction catalyst provides an economical, sustainable, and thus green process for producing disulfides.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Tiantian Yang,Zibo Dong,Inaam Ullah,Ayesha Irfan,Jun He,Jinhe Qi,Mai Li
Efficient interfacial carrier transfer and separation can effectively enhance the photocatalytic performance. Herein, a high-performance g-C 3 N 4 /Ag/BaTiO 3 heterostructure was constructed, which showed promising results in photocatalytic nitrogen fixation and tetracycline degradation. Specifically, Ag-modified tetragonal barium titanate (BaTiO 3 ) nanoparticles were combined with flower-like spherical graphitic carbon nitride (g-C 3 N 4 ) to prepare the g-C 3 N 4 /Ag/BaTiO 3 photocatalyst. The Ag nanoparticles were uniformly distributed on BaTiO 3 through photodeposition, which was subsequently loaded onto g-C 3 N 4 , offering abundant surface active sites and a large surface area for enhanced photocatalytic activity. Four types of composite photocatalysts were prepared. The 1:3-g-C 3 N 4 /Ag/BaTiO 3 photocatalytic composite, composed of g-C 3 N 4 and Ag/BaTiO 3 in a 1:3 ratio, achieved an impressive nitrogen fixation rate of 765.85 μmol g −1 h −1 , greatly exceeding that of pure g-C 3 N 4 and BaTiO 3 by factors of 2.14 and 3.88, respectively. Also 1:3-g-C 3 N 4 /Ag/BaTiO 3 had the highest tetracycline degradation rate of 82.7 %. It was found that the significant improvement of photocatalytic efficiency could be attributed to the ultrasonic vibration-induced piezoelectric polarization of BaTiO 3 , which generates an intrapolar electric field. Additionally, the noble metal Ag nanoparticles with surface plasmon resonance (SPR) effect can be used as electronic mediators to promote charge separation and transfer to form all-solid Z-type heterojunctions. This Z-type heterojunction effectively minimizes the recombination of photogenerated charge carriers of electrons and holes. Studies have shown that this composite photocatalyst exhibits excellent performance in both photocatalytic nitrogen fixation and the degradation of organic pollutants, highlighting the great potential of this composite heterojunction in photocatalysis.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2024
·
IF 2.8
Guo Yaping,Li Jing,Zhang Jin,Wang Xiujv
The photocatalyst S-scheme BiFeO 3 –g-C 3 N 4 had been prepared by combining calcination and hydrothermal reaction. 10% BiFeO 3 –g-C 3 N 4 composite showed the greatest photocatalytic effect during tetracycline hydrochloride degradation (TC-HCl, 99.7% removal) within 100 min. Meantime, the photocatalytic efficacy was further confirmed by the removal efficiency of ciprofloxacin(CIP, 98.2% removal). The formation of S-scheme heterostructure and matching valence band and conduction band may be responsible for the improved photocatalytic efficiency of BiFeO 3 –g-C 3 N 4 . This leads to the rapid separation of photo-induced carriers, increased electronic transport capacity, and extended carrier lifetime. A study was done on the potential mechanism by employing chemical scavenger experiment revealing the paramount role of O 2 − . The composite could maintain photocatalytically stable even after five consecutive reaction cycles. The recovery efficiency of 10% BiFeO 3 –g-C 3 N 4 was high because of the magnetic property of BiFeO 3 , which was convenient for the recycling process. The produced photocatalyst has potential use in the field of photocatalysis, and this work provides a novel thought to raise the photocatalysts recovery efficiency during recycling.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Zhitong Jiang,Xue Chen,Huizhen Xue,Zhoukun Li,Jinhui Lei,Muming Yu,Xin Yan,Hui Cao,Jie Zhou,Jiawei Liu,Mingna Zheng,Weiliang Dong,Yanwei Li,Zhongli Cui
Environmental pollution caused by plastic waste has become global problem that needs to be considered urgently. In the pursuit of a circular plastic economy, biodegradation provides an attractive strategy for managing plastic wastes, whereas effective plastic-degrading microbes and enzymes are required. In this study, we report that Blastobotrys sp. G-9 isolated from discarded plastic in landfills is capable of depolymerizing polyurethanes (PU) and poly (butylene adipate-co-terephthalate) (PBAT). Strain G-9 degrades up to 60% of PU foam after 21 days of incubation at 28 ℃ by breaking down carbonyl groups via secretory hydrolase as confirmed by structural characterization of plastics and degradation products identification. Within the supernatant of strain G-9, we identify a novel cutinase BaCut1, belonging to the esterase family, that can reproduce the same effect. BaCut1 demonstrates efficient degradation toward commercial polyester plastics PU foam (0.5 mg enzyme/25 mg plastic) and agricultural film PBAT (0.5 mg enzyme/10 mg plastic) with 50% and 18% weight loss at 37 ℃ for 48 h, respectively. BaCut1 hydrolyzes PU into adipic acid as a major end-product with 42.9% recovery via ester bond cleavage , and visible biodegradation is also identified from PBAT, which is a beneficial feature for future recycling economy. Molecular docking , along with products distribution, elucidates a special substrate-binding modes of BaCut1 with plastic substrate analogue . BaCut1-mediated polyester plastic degradation offers an alternative approach for managing PU plastic wastes through possible bio-recycling.
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Surfaces and Interfaces
·
2024
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IF 5.7
Qian Cheng,Xiaohan Liu,Chuhan Huang,Hongman Sun,Fazle Subhan,Xinyi Zhou,Yuankai Liu,JiaHui Yang,Qi Li,Youhe Wang,Zifeng Yan
Recently, there has been a growing interest in the fundamental understanding of the mechanism of how MIL-101(Fe)/g-C 3 N 4 heterojunctions facilitate the occurrence of photocatalytic nitrogen fixation reactions, especially the electron transfer mechanism has attained increasing attention in photocatalysis. Herein, we implemented a "triple win scenario" strategy to fabricate the S-scheme MIL-101(Fe)/g-C 3 N 4 heterojunction through a straightforward solvothermal process. The MC-6 heterojunction minimizes the recombination of photogenerated carriers, enhances light utilization efficiency, and activates the N≡N bond, thus boosting photocatalytic nitrogen fixation efficiency. The transition metal iron activates the N≡N bond, while S-scheme heterojunctions reduce the photogenerated carrier recombination. In addition, the decrease in band gap (E g ) leads to an increase in visible light utilization efficiency. ISIXPS proved the mechanism of interelectron transfer of MIL-101(Fe)/g-C 3 N 4 heterojunction under illumination. Upon the creation of the heterojunction, electrons migrate from g-C 3 N 4 to MIL-101(Fe), establishing an inherent electric field due to the disparate Fermi levels between the two materials. The electrons (e - ) on the g-C 3 N 4 CB with a more negative reduction potential and the holes ( h + ) on the MIL-101(Fe) VB are retained, which increased the redox capacity to a great extent required for the reduction of N 2 to NH 3 . The ammonia production efficiency of MC-6 photocatalyst was 160 µmol g cat -1 h -1 , representing an 8-fold and 2.8-fold improvement over pristine g-C 3 N 4 (20 µmol g cat -1 h -1 ) and MIL-101(Fe) (57 µmol g cat -1 h -1 ), respectively.
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CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Zhen Qin,Wenjian Fang,Junying Liu,Zhidong Wei,Zhi Jiang,Wenfeng Shangguan
A two-step photocatalytic water splitting system, termed a “Z-scheme system”, was achieved using Zn-doped g-C 3 N 4 for H 2 evolution and BiVO 4 for O 2 evolution with Fe 2+ /Fe 3+ as a shuttle redox mediator. H 2 and O 2 were evaluated simultaneously when the doping amount of zinc was 10%. Moreover, Zn-doped (10%) g-C 3 N 4 synthesized by an impregnation method showed superior active ability to form the Z-scheme with BiVO 4 than by in-situ synthesis. X-ray diffraction, UV-Vis spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the samples. It was determined that more Zn–N bonds could be formed on the surface of g-C 3 N 4 by impregnation, which could facilitate charge transfer.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2018
·Vol. 165
·期 3
·B118
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IF 3.662
Yuting Wu,Yun Yang,Wu Lei,Caiwei Li,Qingli Hao,Cheng Zhang,Yuehua Zhang,Juan Su
Ascorbic acid (AA) electrochemical sensor upon modification with porous g-C3N4(PCN)/Poly (3,4-ethylenedioxythiophene) (PEDOT) composite was constructed by a facile co-deposited method. The obtained PCN bearing more oxygen-containing functional groups demonstrates excellent dispersion. Transmission electron microscopy (TEM) and Raman spectroscopy were performed to evaluate the structure and morphology of PCN/PEDOT composite. Detailed electrochemical behaviors of AA were investigated by cyclic voltammetry (CV). Under the optimal experimental conditions, the oxidation peak current was linear with the concentration of AA in a wide range from 10 μM to 1500 μM. The combination of PCN and PEDOT brings out large electro-active area and facilitates the electron-transfer greatly, which makes PCN/PEDOT composite appear to be an excellent choice as modified material for the construction of AA sensor.
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CARBOHYDRATE POLYMERS
·
2018
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IF 5.158
Muhammad Haroon,Li Wang,Haojie Yu,Raja Summe Ullah,Zain-ul-Abdin,Rizwan Ullah Khan,Qing Chen,Jian Liu
Carboxymethyl starch- g -polyvinylpyrolidones (CMS- g -PVPs) were prepared by grafting of carboxymethyl starch (CMS) with N -vinylpyrolidone (NVP) using different initiators. The grafting percentage of all the modified starches was determined and the modified starch (CMS- g -PVP-5) with maximum grafting percentage was characterized by elemental analysis, 1 H NMR and FT-IR spectroscopy. Crystallinity and thermal properties of CMS- g -PVP-5 were analysed by XRD and TGA, respectively. CMS- g -PVP-5 was then utilized for the adsorption of Rhodamine 6G (dye) from water under different p H, temperature, adsorbate doze and adsorbent concentration. This modified starch showed good adsorption ability towards Rhodamine 6G. CMS- g -PVP-5 was also applied for the adsorption of ammonia gas and proved an exciting adsorbent for ammonia.
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OPTICAL MATERIALS
·
2025
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IF 4.2
Lirong Chen,Mengyang Lv,Yanyu Wan,Yu Sun,Zhenchao Gu,Shuaishuai Zhang
g-C 3 N 4 /TiO 2 photocatalysts were in-situ synthesized via a straightforward high-temperature calcination method and used to activate persulfate (PS) to degrade indole under different light irradiation. The prepared g-C 3 N 4 /TiO 2 photocatalysts were characterized by SEM, TEM, XRD, BET, XPS, FTIR, and photocurrent response analysis. The CNT 1:5 (mass ratio of g-C 3 N 4 to TiO 2 of 1:5) and CNT 24:1 (mass ratio of g-C 3 N 4 to TiO 2 of 24:1) showed the best performance in degradation of indole solution under UV and visible light, respectively. Free radical quenching experiments and band structure analysis determined that the UV/CNT 1:5 and PS-Vis/CNT 24:1 systems followed an S-scheme and type-II transfer mechanism, respectively. A detailed analysis using GC-MS revealed the indole's intermediate products and proposed the indole's degradation pathway. Furthermore, using natural water matrices, the removal of other typical organic compounds, including quinoline, pyridine, and phenol, was investigated in the UV/CNT 1:5 and PS-Vis/CNT 24:1 systems. The results of this study promote the application of g-C 3 N 4 /TiO 2 composites as organic degradation catalysts, reflecting the potential of composite materials in the removal of toxic organic compounds in coal chemical wastewater.
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