CELLULOSE
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2025
·
IF 4.8
Xuan Xiang-Tao,Zhang Hui,Yao Jia-Le,Miao Ya-Ping,Fan Wei,Dong Xiang-Zhi,Dai Chen-Min,Miao Jiao-Jiao
Photoreforming cellulose to simultaneously produce 5-hydroxymethylfurfural (5-HMF) and hydrogen represents a promising strategy for harnessing solar energy. However, the development of highly efficient photocatalysts for this reaction remains a challenge, and the influence of cellulose’s crystalline structure on conversion efficiency is not well understood. In this study, a Pt-modified g-C 3 N 4 –Bi 3 TiNbO 9 heterojunction photocatalyst was synthesized to explore the photocatalytic reforming of four crystalline forms of cellulose. The results demonstrate that the crystalline structure of cellulose significantly affects hydrogen and 5-HMF production, with the order of activity being cellulose III > IV > II > I. Among the cellulose types tested, cellulose III exhibited the highest performance, achieving 51.8 μmol g⁻ 1 h⁻ 1 of hydrogen and 113.4 μmol g⁻ 1 h⁻ 1 of 5-HMF, surpassing the yields from cellulose I, II, and IV when using the Pt 1.0 –g-C 3 N 4 –Bi 3 TiNbO 9 (2:1) heterojunction. Additionally, a lower degree of polymerization of cellulose was found to favor the coproduction of hydrogen and 5-HMF, as it enhances the breakdown of cellulose via reactive species. Factors such as cellulose powder size, solution pH, and catalyst-cellulose interactions were also shown to influence the yields. Density functional theory (DFT) calculations revealed an electron migration of 0.019684e between the O 2 p and Bi 6 p orbitals of Bi 3 TiNbO 9 (220) and the C 2 p and N 2 p orbitals of g-C 3 N 4 , confirming interfacial electron transfer. The calculated adsorption energies followed the trend: cellulose IV (− 1.72 eV) > I (− 1.73 eV) > II (− 1.94 eV) > III (− 2.07 eV), consistent with experimental results, except for cellulose IV. Graphical abstract
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Xianhua Liu,Miao Liu,Yexin Dai,Jinran Cui,Asad Jamil,Wanxin Liu,Jiaxuan Li,Jiao Wang
Constructing a photocatalytic membrane and photo-Fenton reaction coupling system is a novel strategy to enhance the photocatalytic activity of the membrane and eliminate the problem of membrane contamination. Herein, a g-C 3 N 4 /Bi 2 MoO 6 /PVDF photocatalytic membrane was prepared using a tannic acid-assisted in-situ deposition method. The membrane was characterized by three advantages of photocatalytic, self-cleaning, and antibacterial properties. Under the photo-Fenton-like conditions, the membrane had superior photodegradation efficiency of 90.7% for tetracycline, one of the main antibiotic contaminants in the China's aquatic system. Moreover, the membrane had excellent photo-Fenton self-cleaning ability, its flux recovery rate was up to 96%–98% after the self-cleaning process. Photoluminescence spectra, diffuse UV–visible spectrum, transient photocurrent responses, and electrochemical AC impedance spectrum results show that the heterojunction structure formed by g-C 3 N 4 and Bi 2 MoO 6 could improve the separation efficiency of photogenerated electrons-hole pairs. Electron spin resonance spectroscopy confirmed the photo-electrons facilitated the formation of hydroxyl radical (·OH) in the existence of H 2 O 2 , which enhanced tetracycline degradation. Moreover, the superior photo-Fenton self-cleaning performance, which mainly relied on the active free radicals produced by the photo-Fenton-like membrane to remove dirt on the membrane surface or in the membrane pore channel. Our results may shed new light on the development of promising photocatalytic membrane systems by coupling with photo-Fenton-like processes, and facilitate their applications for wastewater treatment .
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高影响因子
Emergent Materials
·
2025
·
IF 4.1
Shi Zhengzheng,Li Jia,Pan Yupeng,Li Xuewei,Zhuang Zile,Li Yihan,Zhang Zheng,Wang Zirui,Luo Qizhi,Chen Xuncai
The Fenton-like reaction has always been hampered by limitations related to its narrow pH range and poor stability. In this study, we successfully developed a novel catalyst composed of Prussian blue (PB) nanoparticles anchored onto carbon-defective g-C 3 N 4 (CD-C 3 N 4 ) nanosheets with a porous structure. Under visible light irradiation for 120 min, the removal efficiencies of tetracycline can achieve remarkably high removal rates as 93.3%. Significantly, this catalyst attains exceptional long-term stability enabling up to 20 cycles, while consistently maintaining a degradation efficiency exceeding 99%. Furthermore, this system exhibits a wide pH tolerance ranging from 3 to 9. Efficient charge separation and the introduction of carbon defects on the g-C 3 N 4 nanosheets contribute to the robust Fe 3+ /Fe 2+ cycles in PB, which support prolonged multiple recycles. ESR and quenching tests indicated that •O 2 − species play a significant role in catalytic degradation, with •OH and h + also being involved in the photo-Fenton reaction. Finally, we proposed potential photo-Fenton degradation pathways for tetracycline(TC) and conducted a comprehensive investigation into the toxicity changes of TC degradation through full-scale zebrafish toxicology assays. This work presents an innovative approach to construct highly stable Fenton-like catalysts through structural defect engineering combined with Fe-Metal organic frameworks(MOFs) loading strategies.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lin Jin,Yajuan Wei,Lanlan Feng,Yuwen Wang,Shuang Liu,Junwei Zhang,Ruoxuan Ma,Xueying Shao,Xuan Zhang,Demeng Kong,Zibo Zhao,Wei Zhang,Jia Liu,Jingbo Zhang
The construction of ultra-close 2D atomic-thickness Van der Waals heterojunctions with high-speed charge transfer still faces challenges. Here, we synthesized single-layer ZnIn 2 S 4 and g-C 3 N 4 , and introduced silver single atoms to regulate Van der Waals heterojunctions at the atomic level to optimize charge transfer and catalytic activity. At the atomic scale, the impact of detailed structural differences between the two characteristic surfaces of ZnIn 2 S 4 ([Zn-S 4 ] and [In-S 4 ]) on catalytic performance has been first proposed. Experiments combined with the DFT study demonstrate that single atom Ag not only acts as a charge transfer bridge but also regulates the energy band and intrinsic catalytic activity. Benefiting from the enhanced electron delocalization, the synthesized catalyst ZIS/Ag@CN exhibits excellent photocatalytic performance, with a hydrogen production rate of 5.50 mmol·g −1 ·h −1 , which is much higher than the reported Ag-based single-atom catalysts so far. This work provides a new understanding of atomic-level heterojunction interface regulation and modification.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Wang Lixiang,Ren Qiang,Wang Xiaoli
Through a facile sol-gel method, a novel Z-scheme heterojunction BTMO was synthesized by combining Bi-modified TiO 2 with oxygen-modified graphitic carbon nitride. Bi serves as an electron mediator in the catalyst, facilitating the transfer of excited electrons to MCN-O. Infrared characterization reveals that the doping of O increases the adsorption of peroxymonosulfate by the catalyst, promoting the reaction between electrons on the conduction band of MCN-O and PMS. The as-prepared BTMO Z-scheme heterojunction significantly improved the degradation rate of trichloroethylene was in BTMO/PMS system. TCE degradation efficiency in BTMO/PMS photocatalytic system could reach 99.8 % within 1 hour. According to the results of electron paramagnetic resonance and quenching experiments, sulfate radical and holes are the main reactive species in BTMO/PMS system. This novel photocatalyst also exhibited excellent durability. This work provides a new method for solving environmental problems through visible light photocatalysis.
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Analytical Methods
·
2017
·Vol. 10
·期 3
·322-329
·
IF 1.9
Yixin Yang,Peige Qin,Xiaoting Zhang,Jiahua Niu,Shufang Tian,Minghua Lu,Jinhua Zhu,Zongwei Cai
This work demonstrates a simple layer-by-layer approach for producing graphitic carbon nitride (g-C3N4) coated fibers for solid-phase microextraction (SPME) with sol-SiO2 as the binder. With the prepared g-C3N4 coated SPME fiber, a headspace SPME coupled with GC (HS-SPME-GC) method was developed for the analysis of food additives. Detection limits of 0.2–4.0 ng mL−1 were obtained for the analysis of five food additives including methyl cinnamate, ethyl cinnamate, benzyl cinnamate, isobutyl cinnamate, and butylated hydroxytoluene by the developed HS-SPME-GC method with flame ionization detection. The method exhibited good linearity in the range of 0.5–1000.0 ng mL−1 with the coefficient of determination (R2) not lower than 0.9930. The repeatability of the prepared coating was 2.2–5.4% (n = 3) for the same fiber, and the reproducibility was in the range of 5.3–12.4% for three different fibers. The recovery of the developed method was in the range of 73.3–109.8%. Based on the as-prepared g-C3N4 coating, the developed HS-SPME-GC method was successfully applied to the analysis of real samples including biscuits and milk tea beverages.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Xiaohua Zheng,Chenbin Cai,Shihui Lu,Mengnan Xu,Wei Chen,Fanger Yang
Recently, the photocatalytic degradation of organic pollutants has gained increasing attention because of its high efficiency and lack of secondary pollution; however, problems such as rapid electron–hole recombination affect its degradation efficiency. In this study, a novel dual Z-scheme g-C 3 N 4 /Ag 2 MoO 4 /AgBr heterojunction was successfully prepared using a one-step room-temperature precipitation method, with its photocatalytic activity evaluated by degrading rhodamine B (RhB) and tetracycline hydrochloride (TCH). The composition and surface morphology of the ternary catalysts—characterized using X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer–Emmett–Teller (BET) tests, and X-ray photoelectron spectroscopy (XPS)—confirmed the successful loading of Ag 2 MoO 4 and AgBr onto g-C 3 N 4 . Catalytic degradation results showed that the ternary catalyst exhibited the best performance at a 40 % mass fraction of AgBr. Moreover, the ultraviolet–visible diffuse reflectance spectra (UV–Vis DRS), photoluminescence (PL), electrochemical impedance spectroscopy (EIS), and transient photocurrent response test results show that the ternary catalyst has excellent optical properties. In addition, the significant improvement in the catalytic performance can be attributed to the effective charge separation of the dual Z-scheme photocatalytic mechanism based on radical trapping experiments, electron spin resonance (ESR) analysis, and energy band analysis. Hence, this study provides a new approach to studying more efficient photocatalysts.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yue Li,Ping Liu,Shisen Li,Yanting Ren,Wenzhen Du,Wenjing Yin,Haiyan Jiang,Qingli Yang,Yongchao Ma
In this study, novel Ni-doped N-vacancy coral-like porous tubular g-C3N4 (Ni–CN) nanocomposites were fabricated through a simple calcination strategy. The Ni–CN photocatalysts exhibited superior photocatalytic efficacy in the degradation of sunset yellow (SY) when exposed to visible light irradiation. The optimized Ni–CN nanocomposite contributed the highest SY removal efficiency of 96.87% after 120 min of irradiation, showing good reusability and structural stability. The as-prepared Ni–CN gel spheres had a high removal rate of SY from orange juice. In addition, Ni–CN nanosheets (Ni–CN NSs) obtained by ultrasonic stripping can be used as highly selective and sensitive fluorescent sensors for the detection of SY in beverages through dynamic or collisional fluorescence quenching mechanisms. The linear range of Ni–CN NSs for SY detection was 0–80 μM and the detection limit was 0.0397 μM. Here, the constructed Ni–CN nanocomposites provide a novel route for efficient removal and sensitive detection of SY in beverages.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaoyan Ma,Huiting Wang,Yaxian Chen,Longfei Fu,Jie Zhou,Ling Zhang,Zhiqiang Xing,Qian Zhang,Lixin Xia
Utilizing hydrothermal synthesis, TiO 2 and g-C 3 N 4 were grown on cotton fabric. Subsequently, Ag NPs were uniformly deposited on their surfaces to produce a Ag@g-C 3 N 4 /TiO 2 cotton fabric substrate (AGTC) with dual-functionalilites of photocatalytic reusability and SERS signal amplification. The introduction of TiO 2 and g-C 3 N 4 nanocomposites significantly enhances the SERS signal on the AGTC substrate for malachite green (MG) detection. The SERS signal on the AGTC substrate is 2.28 times stronger than that on the bare silver-modified cotton fabric, with a reduced detection limit of 6.74 × 10 −13 M. Additionally, the Local Surface Plasmon Resonance (LSPR) effect induced by Ag NPs facilitates electron transfer among substrate components, markedly enhancing photocatalytic capability for degrading organic pollutants under visible light. Consequently, under visible light, the substrate rapidly degrades pollutants and reverts to a reusable state. Experimental results demonstrate the substrate's capability to continuously detect various concentrations and types of target substances, while maintaining high sensitivity. Leveraging the flexibility of cotton fabric, convenient wipe detection and self-cleaning experiments were conducted on the surfaces of different fish species, validating AGTC's outstanding sensitivity in real sample analysis. Therefore, as a flexible and reusable SERS substrate, AGTC exhibits broad potential applications in both SERS detection and photocatalytic degradation of pollutants.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Chunquan Li,Zhiming Sun,Wanzhong Zhang,Caihong Yu,Shuilin Zheng
A novel 3D heterogeneous g-C 3 N 4 /TiO 2 /kaolinite composite with enhanced visible light activity was fabricated via a mild sol-gel method associated with chemical stripping and self-assembly. Compared with bare photocatalysts, the g-C 3 N 4 /TiO 2 /kaolinite 3D structure exhibits enhanced adsorption-photocatalytic degradation ability for the removal of ciprofloxacin (CIP) under visible-light irradiation, and also facilitate the recyclability of the photocatalyst as demonstrated from the reusability test. The apparent rate constant of the composite is up to around 5.35 times, 6.35 times and 4.49 times that of bare TiO 2 , g-C 3 N 4 and P25, respectively, and a possible degradation pathway was also proposed. On the other hand, the as-received composite also exhibited enriched disinfection ability towards S. aureus . It is indicated that the superoxide radical ( O 2 − ) is the main active species in the degradation process, and the superior photocatalytic performance of composite should be mainly attributed to both the improvement of light harvesting as well as the enhanced separation and transfer efficiency. It is expected that this novel ternary visible-light responding composite would be a promising candidate material for the organic pollutants degradation and bacteria inactivation.
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MOLECULES
·
2024
·Vol. 29
·期 22
·5418
·
IF 4.2
Shuo Yang,Tianna Wu,Kaiyue Li,Ping Huang,Wenhui Li,Yuquan Zhuo,Keyan Liu,Ziwen Yang,Donglai Han
With the intensification of the energy crisis and the growing concern over environmental pollution, particularly the discharge of organic dye pollutants in industrial wastewater, photocatalytic degradation of these contaminants using solar energy has emerged as an effective, eco-friendly solution. In this study, we successfully synthesized 2D/2D g-C3N4/BiOI p-n heterojunctions via a simple precipitation method and a high-temperature calcination method. The unique 2D structures of g-C3N4nanosheets (NSs) and BiOI NSs, coupled with the synergistic effect between the two materials, significantly enhanced the photocatalytic degradation performance of the heterojunctions under simulated sunlight. The band structures, as determined by Tauc curves, Mott–Schottky curves and XPS-VB analysis, revealed a Z-scheme charge transfer mechanism that efficiently reduced charge carrier recombination and improved electron–hole separation. The photocatalytic activity of 2D/2D g-C3N4/BiOI p-n heterojunctions for rhodamine B (Rh B) degradation reached 99.7% efficiency within 60 min, a 2.37-fold and 1.27-fold improvement over pristine BiOI NSs and g-C3N4NSs, respectively. Furthermore, the heterojunction exhibited excellent recyclability stability, with the degradation efficiency decreasing by only 1.2% after five cycles. Radical scavenging experiments confirmed the involvement of superoxide radicals (∙O2−) and hydroxyl radicals (∙OH) as the primary reactive species in the degradation process. This work highlights the potential of 2D/2D g-C3N4/BiOI p-n heterojunctions for efficient photocatalytic applications in environmental remediation.
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高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Shuting Luan,Shiyi Zhang,Wenhua Zhang,Shiwen Lv,Xuchun Li,Xuhua Ren,Yanqing Cong
An efficient and stable catalyst is the key to electrocatalytic hydrogen production . Herein, a bifunctional electrocatalyst is developed for electrocatalytic hydrogen production by depositing S-doped g-C 3 N 4 on Co/Ni metal-organic framework electrode (namely CoNi-MOFs/S-g-C 3 N 4 ). Compared with the original Co/Ni metal-organic framework (CoNi-MOFs), the overpotential of hydrogen production on CoNi-MOFs/S-g-C 3 N 4 is reduced by 49.5 %, the charge transfer resistance is reduced by 74.5 %, and the electrochemically active area is expanded by 60.1 times. Moreover, CoNi-MOFs/S-g-C 3 N 4 can be used as an efficient bifunctional electrocatalyst for overall water splitting. Impressively, using CoNi-MOFs/S-g-C 3 N 4 as the anode and cathode, the hydrogen yield can reach 5.513 mmol h −1 and the energy consumption is 5.822 kWh Nm −3 at a current density of 250 mA cm −2 . In addition, an in-situ overall water splitting system was designed for hydrogen production using high-salt wastewater as water source without additional pre-desalination process, which realizes green hydrogen production and reduces the cost. The hydrogen yield was hold in the range of 5.2–5.3 mmol h −1 for a week, showing excellent performance of hydrogen production and strong stability. More importantly, the system can be applied to various high-salt wastewater with wider pH and salinity, and shows promising application potential for hydrogen production in actual wastewater.
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