International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 24
·16651
·
IF 4.614
Nan Yang,Zhihan Zhang,Shicheng Zhang,Liting Chen,Jia Zhu,Jingsi Gao
In order to improve the catalytic activity and recycling performance of semiconductor activators, and improve the activation pathway of persulfate, graphitic carbon nitride (g-C3N4) was prepared by calcining melamine, and a composite activator Ag2O/g-C3N4based on g-C3N4supported metal oxide was prepared using a precipitation method. The morphology, structure, and basic properties of the composites were characterized using SEM, XRD, FT-IR and XPS. The activation efficiency of the Ag2O/g-C3N4composite activator on peroxodisulfate (PDS) was explored. The results showed that Ag2O in the composite activator was highly dispersed on the surface of g-C3N4and did not change the molecular structure of g-C3N4significantly. Under different activation systems, the degradation process of MO was best fitted under the pseudo-second-order reaction kinetic model, compared to the separate g-C3N4or Ag2O activated PDS systems; the activation of the PDS system with Ag2O/g-C3N4had the best effect on MO degradation; and the composite activator Ag2O/g-C3N4showed better activation performance. Under the conditions that the mass combined ratio of Ag2O in the activator was 12%, the initial concentration of PDS was 4 mmol/L, the initial concentration of the activator was 1.25 g/L, and the initial pH was 3, the degradation degree of MO reached 99.4% after 40 min reaction. The free radical quenching experiment proved that the active substances that could degrade MO in the system were SO4−· and ·OH, and the effect of SO4−· was greater than that of ·OH. The degradation degree of MO in the reaction system remained above 80% after four cycles of use, and the crystal structure of Ag2O/g-C3N4did not change significantly before and after the reaction. The above results show that Ag2O/g-C3N4is an efficient and stable composite activator with good application potential in the treatment of dye wastewater by activating PDS.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lingli Wang,Xu Guo,Yingying Chen,Shasha Ai,Hanming Ding
Cobalt-mediated peroxymonosulfate (PMS) activation is an effective way to generate sulfate radicals for the degradation of pollutants. Herein, a heterogeneous Co-based catalyst was prepared by integrating the cobalt species to the cavities of g -C 3 N 4 via the Co N bonds through the methods of impregnation and calcination, which was applied to activate PMS for the degradation of organic contaminates under visible light. The cobalt species were atomically dispersed on g -C 3 N 4 , which could provide more reactive sites for PMS activation. The catalytic efficiency of cobalt-doped g -C 3 N 4 was greater than that of pure g -C 3 N 4 or even slightly higher than that of the homogeneous cobalt ions during the photo-assisted PMS activation catalytic processes. The optimum Co loading is 1.0% in weight. In 25 min, the dye of rhodamine B was almost completely degraded with a 70.5% of total organic carbon (TOC) removal under its natural pH value in the presence of such catalytic system. The enhanced catalytic activity of Co-doped g -C 3 N 4 was due to the effective separation of the photo-generated charges as well as the sufficient accessible reactive sites for PMS activation. And the synergistic interaction between the photocatalytic and PMS activation processes facilitated the generation of active species for the removal of pollutants.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 4
·1-15
·
IF 2.533
Wang Zhentao,Hasan Jaafar,Wang Jingjing,Zhang Caiwei,Iqbal Waheed,Chang Ninghui,Qin Chuanguang
The treatment of dye-bearing wastes by adsorption using low-cost synthetic adsorbents is urgently needed and challenging because it offers the dual benefit of water treatment and waste management. Herein, the flower-like MoS 2 /g-C 3 N 4 nanocomposites with a size range of 200–400 nm and a specific surface area of 70.656 m2/g were synthesized as new methylene blue (MB) adsorbent materials. Their adsorption mechanisms and influences of pH, adsorbent dosage, concentration, and temperature on the adsorption properties were investigated by batch sorption experiments. Adsorption isotherm data were fitted with the Langmuir model, and the adsorption kinetic characteristics conform to the quasi second-order kinetic equation. According to thermodynamic data, methylene blue (MB) adsorption was endothermic and spontaneous, exhibiting a maximum adsorption capacity of 278.4 mg/g at 45 °C. Additionally, the impact of MB effluent on the germination of chickpea and wheat was studied contrastively with treatment of the tested materials. The results indicated that adequate adsorption of flower-like MoS 2 /g-C 3 N 4 nanocomposite could potentially treat wastewater from the textile industry to be used for irrigation and solve the problem of textile effluent disposal. Graphical abstract
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 6
·4507-4515
·
IF 4.123
Cai-He Wang,Dong-Dong Qin,Duo-Liang Shan,Jing Gu,Yong Yan,Jing Chen,Qiu-Hong Wang,Cai-Hua He,Yang Li,Jing-Jing Quan,Xiao-Quan Lu
Graphitic carbon nitride (g-C3N4) has been widely studied as a metal-free photocatalyst, leading to some excellent results; however, the rapid recombination of photogenerated charge carriers substantially limits its performance. Here, we establish two types of g-C3N4-based heterojunction (type II and nonmediator assisted Z-scheme) photoanodes on a transparent conducting substrate via coupling with rod-like and nanoparticulate WO3, respectively. In these composites, g-C3N4 film grown by electrophoretic deposition of exfoliated g-C3N4 serves as the host or guest material. The optimized type II WO3/g-C3N4 composite exhibits an enhanced photocurrent of 0.82 mA cm−2 at 1.23 V vs. RHE and an incident photo-to-current conversion efficiency (IPCE) of 33% as compared with pure WO3 nanorods (0.22 mA cm−2 for photocurrent and 15% for IPCE). Relative to pure g-C3N4 film (with a photocurrent of several microampere and an IPCE of 2%), a largely improved photocurrent of 0.22 mA cm−2 and an IPCE of 20% were acquired for the Z-scheme g-C3N4/WO3 composite. The enhancement can be attributed to accelerated charge separation in the heterointerface because of the suitably aligned band gap between WO3 and g-C3N4, as confirmed by optical spectroscopy and ultraviolet photoelectron spectroscopy (UPS) analysis. The photocatalytic process and mechanism of the g-C3N4-based heterojunctions are proposed herein, which potentially explain the origin of the enhanced photoelectrochemical performance. This achievement and the fundamental information supplied here indicate the importance of rationally designing heterojunction photoelectrodes to improve the performance of semiconductors. This is particularly important for materials such as pure g-C3N4 and WO3, as their photoactivities are strongly restricted by high recombination rates.
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高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
He Wan,Yang Liu,Chunhui Yu,Kuiyuan Cao,Yongwei Han,Zhong Sun,Junyou Shi,Xixin Duan
Mild condition and high selectivity are challenging in oxidative depolymerization of lignin to phenolic compounds. In this study, choline chloride (ChCl) was introduced to selectively prepare monophenol compounds from the fractionation of larch lignin with the catalyst of g-C3N4 (CN) supported by H4PMo11VO40 (HPMoV). When the yield of bio-oil was 35%, the novel product of 1-(4-hydroxy-3- methoxyphenyl) butan-1-one (HMB) was obtained with the 11% yield under optimized conditions of 0.2 g 25% HPMoV/CN, ChCl: p-toluene sulfonic acid (PTS) (molar ratio 1:2), 1 mL H2O, 6 h, 80 °C, 220 W xenon lamp and air atmosphere. Results from different deep eutectic solvents (DES) indicated that ChCl was essential for HMB generation. The cleavage of β-O-4 bonds was dominant in the fraction of larch lignin and five representative lignin model compounds (LMCs) under optimum conditions. In addition, distinct degradation mechanisms of native lignin and different LMCs were deduced separately. Compared with other reported products in depolymerizing lignin by chemical oxidative procedures, the presentation of HMB was different because of the conjugate addition of ·CH3 from ChCl accompanying the participation of H2O. Overall, the integrative catalysis from acidic DES, strong oxidizing HPMoV, and visible light in this work provides new insights for valorizing lignocellulose into value-added aromatic products in an ambient, convenient, and photocatalytic reaction system.
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高影响因子
Materials
·
2025
·Vol. 18
·期 8
·1733
·
IF 3.2
Zhenling Yang,Guofeng Ma,Jun Zhang
Peroxynitrite-based advanced oxidation technology has gradually become a research hotspot for degrading dye wastewater due to its high efficiency and environmentally friendly features. Transition metal elements, which are commonly used as catalysts for the activation of persulfates, suffer from problems such as easy deactivation and leaching of metal ions, which limit their practical application. In this study, Co78Si8B14/g-C3N4composite catalysts were prepared by wet milling and ball milling methods to investigate their degradation of Orange II dyes by assisting the activation of peroxynitrite under visible light, and the effects of the catalyst ratio, light intensity, and the dosage of catalysts on the degradation performance were investigated. It was shown that the optimum ratio of Co78Si8B14to g-C3N4was 1:3, and the reaction rate constants for the degradation of orange dye by Co78Si8B14/g-C3N4+ PMS + VIS were 4.3 and 5.37 times higher than those of single g-C3N4+ PMS and Co78Si8B14+ PMS, respectively. Meanwhile, the composite catalyst also showed good degradation performance for rhodamine B, methyl orange, and methylene blue dyes, and the degradation effect could reach more than 75%. Cyclic stability tests showed that the catalyst maintained a high degradation efficiency of more than 94% over multiple cycles with low ion dissolution concentration. Its high catalytic activity is attributed to the lowest adsorption energy of the composite catalyst to PMS (Eads= −1.97 eV), which facilitates the degradation reaction, while the synergistic effect of g-C3N4and Co78Si8B14promotes the production of ·SO4, ·OH, and ·O2−. This study provides new ideas for the development of stable and efficient catalysts to expand the synergy between PMS-based and other advanced oxidation technologies.
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DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 10
·752
·
IF 4.3
Chang Feng,Yufeng Chen,Weie Wang,Yanan Niu,Xi Cao,Yuguang Lv
g-C3N4, a biocompatible material, has prominent applications in biology and is ideal for nano-enzyme studies. Though reported as a peroxidase mimic, its activity remains low. This group combined N,S-doped carbon quantum dots (NS-CQDs) with g-C3N4(7NSC-g), verifying its peroxidase-like activity. Based on this, a ternary composite of Co3O4in different forms and 7NSC-g was developed to enhance peroxidase activity, to design a g-C3N4-based composite enzyme. Characterizations determined the composition and morphology. Colorimetry evaluated peroxidase activity, where the simulated enzyme catalyzes blue product formation from the TMB substrate in the presence of H2O2. UV-Vis spectrophotometry measured absorbance changes to determine target concentrations. The results show Co3O4doping improves catalytic activity, with larger specific surface area providing more activation sites. The highest activity of g-C3N4/NS-CQDs/Co3O4was at 5% floral Co3O4, being efficient due to Co3O4’s electron-transfer acceleration and hydroxyl-radical mechanism. Under optimal conditions, the composite detected H2O2(10.0–230.0 μM, detection limit of 0.031 μM) and glucose (10.0–650.0 μM, detection limit of 1.024 μM).
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Zihan Wei,Xiaoqian Ren,Tianhong Mei,Rongcheng Xiang,Wugan Wei,Xiaorui Yang,Yan Fang,Wenlong Xu,Jianliang Zhu,Jinhua Liang
In this study, various of MgFeTi-LDH/g-C3N4 photocatalytic materials had been successfully synthesized through self-assembly, and the physicochemical and photoelectric properties were thoroughly characterized. Optical performance characterizations of band gaps and VB-XPS spectra revealed that the EVB and ECB alignment of MgFeTi (3:1)-LDH/g-C3N4 composites are consistent with the fundamental characteristics of S-type heterojunctions. MgFeTi (3:1)-LDH/g-C3N4 coupled with sodium persulfate activation for TCH degradation achieved nearly 100% removal efficiency under visible light, surpassing previously reported catalysts. Moreover, five repeated tests of MgFeTi (3:1)-LDH/g-C₃N₄ showed negligible change in the removal rate of TCH, indicating its potential value for industrial applications. Furthermore, the catalytic degradation pathway and mechanism for MgFeTi (3:1)-LDH/g-C3N4 have been elucidated through LC-MS analysis, radical capture, and characterization. In addition, the high efficiency of TCH degradation is attributed to the synergy of Fe3+、Fe2+, SPS, and active species such as •OH, SO4•−, and •O2−. Finally, the QSAR analysis and OD600 values suggest that the degradation pathway and time lead to a reduction in toxicity and the potential risk to the degradation liquid. This study offers simple, economical approach to completely degradation TCH, also providing practical application prospects in wastewater treatment.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zishuai Hu,Mankun Li,Yidan Pang,Yongmei Liang,Baochen Han,Jian Qi,Fanchun Meng,Yaqiang Li,Guangqian Zhu,Lekbach Yassir,Jianhui Li,Dan Liu
Hydrogel coatings demonstrate potential for protecting against microbiologically influenced corrosion; however, they encounter limitations related to weak mechanical properties and toxicity from chemical crosslinkers. In this study, we prepared a photocatalytic antibacterial hydrogel coating using chitosan and sodium alginate loaded with 2D g-C 3 N 4 , which exhibited robust tensile properties, low swelling rates, and exceptional antibacterial efficacy against Escherichia coli and Staphylococcus aureus. The antibacterial activity is primarily attributed to the adsorption of bacteria by –NH 2 groups and the generation of reactive oxygen species by 2D g-C 3 N 4 . Furthermore, the electron-rich microenvironment created by –NH 2 and –OH groups attract the h + generated during 2D g-C 3 N 4 photocatalysis, thereby enhancing the efficiency of charge carrier separation. Density functional theory calculations further support this conclusion. The incorporation of 2D g-C 3 N 4 nanomaterials alters the hydrogel coating structure, disrupting hydrogen bonding and exposing additional –NH 2 groups that bind with H + to improve active adsorption. This innovative hydrogel coating offers a novel strategy for protecting against microbial corrosion in marine environments.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 29
·7645-7653
·
IF 3.307
Zhang Dong-Ping,Wang Ling-E,Liu Xiao-Ying,Luo Zhi-Hua,Zheng Lei,He Yun,Zhang Bo
A facile and feasible photoelectrochemical (PEC) immunoassay based on plasmon-enhanced energy transfer between gold nanoparticles (AuNPs) and CdS quantum dots (QDs)/g-C 3 N 4 nanosheets was developed for the ultrasensitive detection of lipoprotein-associated phospholipase A 2 (Lp-PLA 2 ). To construct such a sensing platform, the immunosensor was prepared by immobilizing Lp-PLA 2 on a CdS QDs/g-C 3 N 4 -modified electrode. A competitive-type immunoreaction was utilized for Lp-PLA 2 detection, with AuNP-labeled anti-Lp-PLA 2 antibody used as the competitor. Introducing AuNPs with the specific antibody for the antigen target Lp-PLA 2 led to heavy quenching of the photocurrent of CdS QDs/g-C 3 N 4 due to the plasmon-enhanced energy transfer between AuNPs and CdS QDs. The quenching efficiency decreased with increasing target Lp-PLA 2 concentration. Under optimal conditions, the PEC immunosensor presented a good photocurrent response to the target Lp-PLA 2 in the dynamic linear range of 0.01–300 ng mL −1 , with a low detection limit of 5.3 pg mL −1 . Other biomarkers and natural enzymes did not interfere with response of this system. The reproducibility and accuracy of this method for the analysis of human serum specimens were evaluated, and the results given by the method developed here were found to closely correspond to the results obtained with commercial Lp-PLA 2 ELISA kits. Importantly, this protocol offers promise for the development of exciton–plasmon interaction-based PEC detection systems.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yong Yang,Jiajia Wu,Tingting Xiao,Zheng Tang,Jinyou Shen,Haijin Li,Yong Zhou,Zhigang Zou
A unique urchin-like CoZnAl-LDH/RGO/g-C 3 N 4 (LDH/RGO/CN) Z-scheme photocatalyst, which is fabricated by the hydrothermal synthesis of CoZnAl-LDH and the in situ loading of RGO and g-C 3 N 4 , is developed for the photocatalytic conversion of CO 2 . The special spiny external surface and hollow inner cavity endow LDH/RGO/CN with a significantly enhanced light-harvesting capacity. The well-distributed g-C 3 N 4 nanosheets on the CoZnAl-LDH nanoplates, combined with RGO as an electron mediator, constructs an excellent heterosystem with numerous interfaces, efficient charge separation and highly exposed catalytic active sites. The Z-scheme charge-transfer process promotes the oxidizability and reducibility of CoZnAl-LDH and g-C 3 N 4 . Furthermore, the synergistic effect among the components contributes to intense adsorption and chemical activation towards CO 2 , which reduces the reaction barrier for CO 2 photoreduction. As a result, the optimized LDH/RGO/CN exhibits highly efficient and selective photocatalytic CO 2 conversion to CO. The special 3D urchin-like architecture paves a new way for design of photocatalyst with ideal performance.
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高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Wang Shan,Fu Jing,Zhang Fang,Huan Ruirui,Liu Ting,Zeng Xingguo
Abstract A 0D/2D (0-dimensional/2-dimensional) nanostructure was designed by self-assembly of N–C QDs and carboxylated g-C 3 N 4 nanosheets and used as a fluorescence resonance energy transfer (FRET) fluorescent sensor. The N–C QDs/g-C 3 N 4 nanosheets were synthesized via the amino group on the N–C QD surface and the –COOH of the carboxylated g-C 3 N 4 nanosheets. The mechanism of detection of metronidazole (MNZ) by N–C QDs/g-C 3 N 4 nanocomposites is based on FRET between negatively charged N–QDs and positively charged carboxylated g-C 3 N 4 nanoparticles. N–C QDs/g-C 3 N 4 nanostructures displayed good responses for the detection of MNZ at normal temperature and pressure. The decrease in the fluorescence intensity showed a good linear relationship to MNZ concentration within 0–2.6 × 10 −5 mol/L, and the detection limit was 0.66 μM. The novel FRET sensor will have a great potential in clinical analysis and biological studies. Graphical Abstract
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高影响因子
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