CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Chongyue Jin,Min Wang,Zhilin Li,Jin Kang,Yan Zhao,Jin Han,Zengmin Wu
In this study, to improve peroxymonosulfate (PMS)-mediated visible-light photocatalytic performance of g-C 3 N 4 in antibiotics degradation and elucidate its mechanism, an ultrathin Co 3 O 4 nanomeshes/g-C 3 N 4 nanosheets 2D Z-scheme heterojunction composite (x% Co 3 O 4 /g-C 3 N 4 ) was successfully prepared calcining the mixtures of MOF-Co ultrathin nanosheets and g-C 3 N 4 . This unique nanomeshes/nanosheets structure with large SSA (153.92 m 2 /g) possessed an abundance of accessible active sites and large area intimate interfaces between Co 3 O 4 and g-C 3 N 4 , thus remarkably promoting the separation and transport of charge carriers. The as-prepared optimal 10% Co 3 O 4 /g-C 3 N 4 composites exhibited excellent degradation efficiency toward tetracycline (TC) under visible light irradiation and were further enhanced with the addition of PMS. The mechanism of the enhanced TC degradation in Co 3 O 4 /g-C 3 N 4 /Vis/PMS system was investigated in detail based on the characterization of the catalysts, TC degradation efficiency assessment, electron paramagnetic resonance (EPR) measurements, and reactive oxygen species (ROSs) quenching results. The TC degradation pathway was proposed based on the intermediates identified by the gas chromatography-mass spectrometer (GC–MS) measurements. This study provides a facile and promising path for the remediation of contaminated water via PMS mediated photocatalysis over highly active g-C 3 N 4 -based catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Beibei Wang,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
We report an unique 2D/2D Iodine doped BiOIO 3 /g-C 3 N 4 heterojunction was successfully prepared. The iodine doped BiOIO 3 was prepared by a simple solvent exchange method and combined with g-C 3 N 4 by solvothermal method . The prepared photocatalyst has potential application value in the future due to its excellent stable cycle property. BiOIO 3 nanoplates and g-C 3 N 4 nanosheets form a close interfacial contact directly, so the catalyst has higher charge transport efficiency and wide visible range due to the introduction of iodide ions. Synergistic heterojunction exhibits strong photocatalytic activity for degradation of NO at ppb-level under visible light , of which 30% Iodine doped BiOIO 3 /g-C 3 N 4 can achieve a maximum removal rate of 57% for NO. According to the experimental results of ESR and other experiments, a more complex Z-scheme photocatalytic mechanism is proposed, which has stronger redox ability than the traditional mechanism.
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TALANTA
·
2020
·
IF 5.339
Chengji Sui,Qian Wang,Yunlei Zhou,Dingding Zhang,Huanshun Yin,Shiyun Ai
A sensitively homogeneous electrochemiluminescence (ECL) method was developed for 5-hydroxymethylcytosine (5hmC) detection using TiO 2 /MoS 2 /g-C 3 N 4 /GCE as substrate electrode, where g-C 3 N 4 was employed as the ECL active material, the MoS 2 nanosheets were used as co-catalyst, and TiO 2 was adopted as phosphate group capture reagent. To achieve the specific recognition and capture of 5hmC, the covalent reaction between –CH 2 OH and –SH was employed under the catalysis of HhaI methyltransferase, in which, –SH functionalized ferrocenedicarboxylic acid polymer (PFc-SH) was prepared as 5hmC capture reagent and ECL signal quencher. Then, based on the interaction between TiO 2 and phosphate group of 5hmC, the target was recognized and captured on electrode, resulting in a decreased ECL response due to the quenching effect of PFc-SH. Under optimal conditions, the biosensor presented the linear range from 0.01 to 500 nM with the detection limit of 3.21 pM (S/N = 3). The steric effect on electrode surface is a bottle-neck issue restricting devised biosensors advancement. In this work, the reaction between 5hmC and PFc was carried out in the solution, which can avoid steric effect on electrode surface to keep the high activity of enzyme. In addition, the biosensor was successfully applied to detect 5hmC in genomic DNA of chicken embryo fibroblast cells and different tissues of rice seedlings.
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CERAMICS INTERNATIONAL
·
2020
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IF 3.83
Shuwen Li,Xianghui Zeng,Hui Chen,Wei Fang,Xuan He,Weixin Li,Zhao hui Huang,Lei Zhao
Hexagonal boron nitride ( h -BN) has been widely applied to different fields owing to its unique structural feature. Porous h -BN materials are promising CO 2 adsorbents by virtue of the large specific surface area and intrinsic polarity. Here, porous few-layered h -BN nanosheets , which were synthesized using bulk graphitic carbon nitride (g-C 3 N 4 ) as a template, presented high crystallinity with a thickness of ~5.5 nm. It exhibited unique high porosity with a specific surface area of 212.620 m 2 g −1 . Simultaneously, the material displayed excellent CO 2 adsorption properties endowed to its porous nature and its optimal CO 2 adsorption capacity could be 19.26 cm 3 g −1 at 25 °C under atmospheric pressure. Based on thermodynamic calculations, the formation mechanism of porous few-layered 2D h -BN nanosheets with g-C 3 N 4 as sacrificial templates was proposed.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 7
·7025-7039
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IF 2.914
Gao Boru,Wang Jin,Dou Mengmeng,Xu Ce,Huang Xue
In present study, an efficient ternary Ag/TiO 2 /mesoporous g-C 3 N 4 (M-g-C 3 N 4 ) photocatalyst was successfully synthesized through depositing Ag nanoparticles (NPs) on the surface of TiO 2 /M-g-C 3 N 4 heterojunction. Ag/TiO 2 /M-g-C 3 N 4 nanocomposite displayed the highest degradation efficiency for amoxicillin (AMX) compared to TiO 2 /M-g-C 3 N 4 heterojunction, M-g-C 3 N 4 , and bulk-g-C 3 N 4 (B-g-C 3 N 4 ). The removal efficiency of AMX in real situation, surface water (SW), hospital wastewater (HW), and waste water treatment plant (WWTP) also were studied to illustrate the effectiveness of Ag/TiO 2 /M-g-C 3 N 4 photocatalysts. The vulnerable atoms in AMX structure were revealed through DFT calculation. Additionally, the dominating active groups produced in time of the photocatalytic procedure were determined on account of free radical trapping experiments and ESR spectra. The mechanism of photocatalytic degradation was proposed and verified. The transfer of the electrons and the inhibition of the recombination of photogenerated electron-holes were enhanced effectively under the synergistic effect of the Ag NPs and TiO 2 . As a consequence, the catalytic activity of the composite was improved under visible light.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
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IF 4.175
Shu Wu,Jingjing Guo,Yan Wang
Constructing heterojunction to achieve efficient charge separation and transfer is a significant way to enhance photocatalytic activity. Herein, a novel ternary Bi 2 O 2 CO 3 –Bi 2 O 2 (OH)NO 3 /g-C 3 N 4 (labeled as BOC-BON/CN) heterojunction photocatalyst was successfully synthesized by ion exchange reaction under hydrothermal conditions. The products were characterized by various analytical methods, including X-ray diffraction (XRD), Fourier transform-infrared spectrometer (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray spectrometer (SEM), UV–vis reflectance spectra (UV–vis DRS), photoluminescence (PL), photocurrent response and electrochemical impedance spectroscopy (EIS). Heterojunction formation mechanism and photocatalytic degradation mechanism were discussed in detail. The prepared BOC-BON/CN heterojunction exhibited excellent Rhodamine B (RhB) photodegradation rate of 0.0476 min −1 under visible light, which was 3.55 times of the pristine g-C 3 N 4 (0.0134 min −1 ). The significant increase in photodegradation rate was attributable to the heterojunction structure, which promotes the separation of photogenerated charges. Bi 2 O 2 (OH)NO 3 played an essential role as electron accelerator in the charge transfer process. The internal electric field of Bi 2 O 2 (OH)NO 3 accelerates the directed transfer of electron from g-C 3 N 4 to Bi 2 O 2 CO 3 . This work extends the study of g–C 3 N 4 –based photocatalytic systems and demonstrates Bi 2 O 2 (OH)NO 3 as a promising cocatalyst.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Qingling Chen,Wulin Yang,Jiajun Zhu,Licai Fu,Deyi Li,Lingping Zhou
Photocatalytic degradation is considered as a promising strategy to address the environmental threat caused by antibiotics abuse. Visible light driven g-C 3 N 4 decorated ZrO 2-x nanotubes heterostructure photocatalysts for antibiotic degradation were successfully synthesized by anodic oxidation and following a thermal vapor deposition method. Compared with pure g-C 3 N 4 or ZrO 2-x nanotubes, the composite photocatalysts exhibited more extended visible light response and higher separation rate of photo-generated electron-holes pairs. The optimized heteroctructure with 7.1 wt.% g-C 3 N 4 exhibited 90.6% degradation of tetracycline hydrochloride (TC-H) under 1 h visible light irradiation. The mainly active species of TC-H degradation were photo-generated h + and O 2 - . The pathway of charge migration in the g-C 3 N 4 /ZrO 2-x NTs system was also studied and a possible photocatalytic mechanism was proposed for TC-H degradation. Constructing the g-C 3 N 4 /ZrO 2-x nanotubes heterostructure is anticipated to be an effective strategy for photocatalytic degradation of antibiotics.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 48
·23312-23320
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IF 3.925
Zegang Qiu,Zongxuan Li,Shaobo Ma,Zhiqin Li,Yueling Cao,Guangyu Li
The development of a highly effective non-noble metal catalyst for the synthesis of cyclohexanols with high selectivity is very important for the value-added utilization of lignin-derived phenolic compounds. In this paper, a promising Co/NPCN (nitrogen-doped porous carbon nanotubes) catalyst with Co nanoparticles (NPs) embedded in nitrogen-doped carbon for selective hydrogenating of phenol was prepared by introducing an appropriate amount of g-C3N4 (graphitic carbon nitride) into the preparation of ZIF-67 (Zeolite imidazolate framework). Characterization results reveal that the introduction of g-C3N4 of an appropriate amount reduces the size of Co NPs, improves the specific surface area and pore volume, and facilitates the formation of Co0. Full phenol conversion with 100% cyclohexanol selectivity could be achieved at 120 °C, 3 h and 2 MPa H2 over Co/NPCN. In addition, Co/NPCN presents great stability and scalability of the substrate in the phenol hydrogenation reaction. The DFT (density functional theory) calculations reveal that the parallel adsorption configuration of phenol is preferential, which favors the hydrogenation of phenol to cyclohexanol with high selectivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Shuang Liang,Guozhe Sui,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Jinlong Li,Chao Wang
The development of efficient heterojunctions with enhanced photocatalytic properties is considered a promising approach for photocatalytic hydrogen production. In this study, graphitic carbon nitride (g-C 3 N 4 )-wrapped nickel-doped zinc oxide/carbon (Ni-ZnO@C/g-C 3 N 4 ) core-double shell heterojunctions with unique core-double shell structures were employed as efficient photocatalysts through an innovative approach. Ni doping can enhance the intensity and range of visible light absorption in ZnO, and the carbon core coupled with the hollow double-shell structure can accelerate the charge transfer rate and improve the photon utilization efficiency. Meanwhile, the construction of the Z-scheme heterojunction extended the electron-hole pair transport path. In addition, the Z-scheme charge-transfer mechanism of Ni-ZnO@C/g-C 3 N 4 under simulated sunlight was verified by photoluminescence (PL) and electron spin resonance (ESR) experiments. As a result, the obtained photocatalyst acquired a high hydrogen evolution rate of 336.08 μmol g −1 h −1 , which is 36.49 times higher than that of pristine ZnO. Overall, this work may provide a pathway for the construction of highly efficient photocatalysts with unique core-double shell structures.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Bingke Xie,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jianmei Lu
Nitrogen oxide (NOx) removal has long been a subject that has motivated researchers to develop a diverse range of techniques, including physical adsorption, biofiltration, low temperature plasma, selective catalytic reduction, and photocatalytic oxidation. In this work, Cs 3 Bi 2 Br 9 lead-free perovskite was synthesized via in-situ growth on a 3D flower-like g-C 3 N 4 microsphere, which uses a series of Cs 3 Bi 2 Br 9 /g-C 3 N 4 (labeled as X% CBB/CN, where X = 5, 10, 20, 30, and 50) heterojunctions for the photocatalytic removal of NOx. The efficiency of NO removal was enhanced considerably, compared with that of the pristine elements, when irradiated with a 300 W Xe lamp with the concentration of NO at the ppb level. The results of photocurrent measurements and electrochemical impedance spectroscopy are consistent with the results of the NO removal test. Electron spin resonance results verified that ⋅OH and ⋅O 2 − are formed under visible light irradiation. We report the detailed mechanism for the photocatalytic process of NO removal by CBB/CN heterojunctions and provide insights into the potential applications of lead-free perovskite-based heterostructures in the field of photocatalysis.
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JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Yadong Liu,Yongjin Li,Jinge Hao,Taizhong Xiao,Liang Xu,Pengqi Shao,Zhaoyi Yin,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
Graphitic carbon nitride (g-C 3 N 4 ) holds great promise for photocatalytic CO 2 reduction, but its performance is critically limited by strong excitonic effects that hinder charge separation and migration. Herein, a highly dispersed Ce-doped tubular g-C 3 N 4 framework was designed to induce a tailored amorphous phase transition, fundamentally modifying its electronic and structural properties. The amorphization creates a static exciton self-trapping network that reduces the exciton binding energy from 65 to 54.3 meV and generates a robust localized built-in electric field, driving spatial separation and directional charge migration along the one-dimensional tubular channels. Meanwhile, Ce 3+ /Ce 4+ redox couples act as a dynamic electron buffer, kinetically capturing and shuttling electrons. Consequently, the optimized 3%Ce-TCN achieves a CO production rate of 87.31 μmol/(g·h) under visible light, a 2.5-fold enhancement over pristine TCN, with an apparent quantum efficiency of 0.799% at 420 nm. In-situ Fourier transform infrared (FTIR) and density functional theory (DFT) calculations confirm that the Ce sites lower the energy barrier for key *COOH intermediate formation. This work establishes a new paradigm for manipulating exciton dynamics and carrier migration through rare earth-doping-induced microstructural engineering.
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LANGMUIR
·
2023
·
IF 3.9
Anran Li,Zhenyu Zhang,Chengqi Feng,Ting Zhang,Fei Liu,Haining Na,Jin Zhu
Graphite carbon nitride (g-C3N4) with a suitable structure and strong amine activity is designed and prepared to serve as a hydrogen bond donor for the microfibrilization of corncob cellulose to form a cellulose microfiber (CMF) bundle. Simultaneously, well-dispersed nanosized g-C3N4 is loaded into the bundle to form a photocatalyst for efficient photodegradation of rhodamine B (Rh B) in water. Under the optimal preparation conditions at 165 °C, 10 min, and 0.08 mol/L H2SO4, the yield of g-C3N4-functionalized cellulose microfibers (CMF-g-C3N4) reaches to the highest over 70%. The catalytic rate of CMF-g-C3N4 is 3.3 times larger than that of pure g-C3N4. The degradation rate of Rh B is maintained at over 90% in 10 cycles of photocatalytic degradation. The obtained CMF-g-C3N4 also has good thermal stability and mechanical properties. This research suggests a particularly simple way to transform cellulose into a highly efficient photocatalyst for water treatment.
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