BMC Chemistry
·
2025
·Vol. 19
·期 1
·1-15
·
IF 4.6
Lei Ying,Bao Qijing,Lin Feng,Zhang Jian,Zhang Yanji,Wu Yuechao,Lv Liang,Ding Liyong
Graphite carbon nitride (g-C 3 N 4 ) has emerged as a promising photocatalyst for visible-light-driven applications due to its suitable band structure. However, the rapid recombination of photogenerated electron-hole pairs in bulk g-C 3 N 4 significantly hinders its photocatalytic efficiency. In this study, we report the fabrication of a ternary g-C 3 N 4 /MoS 2 /rGO (CMG) nanocomposite via in situ photoreduction-induced exfoliation. The introduction of MoS 2 and rGO not only facilitates the exfoliation of g-C 3 N 4 into ultrathin nanosheet, thereby exposing more active sites, but also enables the formation of tightly coupled heterojunctions that promote charge separation and transfer. Photoluminescence (PL) analyses confirm the suppressed recombination of charge carriers, indicative of enhanced charge dynamics within the heterojunction between MoS 2 , rGO and g-C 3 N 4 . Among the synthesized materials, the optimized CMG-175 composite exhibits remarkable photocatalytic activity, achieving a 95.7% degradation rate of Rhodamine B (RhB) within 30 min under visible light irradiation, which is 23.6-fold enhancement compared to pristine g-C 3 N 4 . Mechanistic studies reveal that photogenerated holes and superoxide radicals are the predominant reactive species driving the degradation process. This work highlights a rational design strategy for constructing high-performance g-C 3 N 4 -based heterojunction photocatalysts and provides valuable insight into the synergistic interactions among MoS 2 , rGO, and g-C 3 N 4 for efficient organic pollutant removal.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121293
·
IF 7.2
Yang Liu,Tingting Fan,Changhao Liu,Yun-Ze Long
Managing oily wastewater under harsh conditions poses a significant challenge in environmental protection. Conventional membranes are often ineffective in treating oily wastewater under complex environmental conditions and typically fail to achieve complete oil–water separation. This work reports the preparation of a reduced graphene oxide (rGO)/zeolitic imidazolate framework (ZIF-8) @ polyphenylene sulfide (PPS) fiber membrane by in-situ growth of ZIF-8 on the rGO-coated PPS fiber membrane. The incorporation of the rGO increases the roughness of the fibrous membrane and enhances the bond between the polymer membrane and the ZIF-8 layer, as the oxygen-containing groups of rGO can interact with the Zn 2+ of the ZIF-8 precursor, facilitating the preferential growth of ZIF-8 crystals on the rGO surface. The resulting rGO/ZIF-8@PPS membrane exhibits underwater superoleophobic and under-oil superhydrophilic properties, endowing it with switchable oil-water separation capabilities (oil-passing water-blocking or water-passing oil-blocking). During the oil (chloroform)/water separation process, it achieves high efficiency (99.96 %) and flux (27,176 L m −2 h −1 ). After 10 separation cycles using either water or oil as the permeating phase, the membrane maintains a high filtration flux (20,500 L m⁻² h⁻¹) and separation efficiency (99.97 %). Additionally, it can efficiently separate a range of oil/water mixtures under different acidic and alkaline conditions, retaining excellent separation efficiency and flux even after 10 cycles. This composite fibrous membrane provides a novel approach for treating large-scale oily wastewater in harsh environments.
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ACS Applied Materials & Interfaces
·
2026
·
IF 8.2
Yechen Wang,Hao Yu,Sufang Guo,Qi An
In this work, PVDF-HFP-based piezoelectric composite films incorporating MgO and rGO nanofillers were fabricated via a facile phase-separation method. The influences of filler composition and loading amount on their piezocatalytic and antibacterial performances were systematically investigated. MgO@rGO/PVDF-HFP film (4 wt % of MgO and 4 wt % of rGO) exhibited the best piezocatalytic activity, achieving rapid degradation on RhB, MO, and MB dyes with high efficiencies of 95.88%, 91.42%, and 98.15%, respectively. The dyes were not only decolorized but also further mineralized into inorganic carbon. The composite film also demonstrated excellent antibacterial performance, reaching 100% inhibition against E. coli and S. aureus upon ultrasonication. The superior catalytic behavior is attributed to the formation of the MgO@rGO heterojunction, which optimizes the energy band for the redox reaction, thereby promoting the generation of reactive oxygen species (ROS). Under ultrasonic excitation, the MgO@rGO/PVDF-HFP film produced substantially higher ·O2–, ·OH, and H2O2 levels than the other films, and ROS-trapping experiments confirmed ·OH and electrons as the primary active species. These enhancements arise from efficient charge transfer across the MgO@rGO interface and chemically induced polarization within the PVDF-HFP matrix, which together strengthen the piezoelectric response. This study demonstrates that constructing heterojunction nanofillers in flexible polymers is an effective strategy to enhance piezocatalysis for environmental purification and antimicrobial applications.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2026
·
IF 3.5
Ren Qiuxuan,Xu Jiaojiao,Liu Yuqi,Ma Aijie,Zhang Gai
The development of ORR catalysts that combine high activity with low cost is essential for advancing the practical implementation of related technologies. In this work, an ORR catalyst Co 2 Pc 2 (EP) 4 /RGO was successfully synthesized via a facile π-π self-assembly approach, where spherical binuclear metallophthalocyanine (Co 2 Pc 2 (EP) 4 ) was loaded onto the surface of reduced graphene oxide (RGO). The structural and morphological characteristics of Co 2 Pc 2 (EP) 4 /RGO were systematically investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical performance tests showed that the onset potential ( E 0 ) of Co 2 Pc 2 (EP) 4 /RGO was comparable to that of commercial Pt/C, while the half-wave potential (E 1/2 ) of Co 2 Pc 2 (EP) 4 /RGO exhibited a positive shift of 130 mV compared to that of pure Co 2 Pc 2 (EP) 4 . The electrocatalytic activity of Co 2 Pc 2 (EP) 4 / RGO dramatically enhanced because of π-π interactions between Co 2 Pc 2 (EP) 4 and RGO, which promoted the oxygen molecules concentration around the active sites. The high oxygen molecules concentration is conducive to form an intermediate O 2 ads - Co 2 Pc 2 (EP) 4 @RGO to decrease the activation energy of the *OOH dissociation step in a four-electron ORR process and the oxygen molecules could be reduced more easily. This study offers a new direction for the design of oxygen reduction reaction catalysts.
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Journal of Materials Chemistry C
·
2026
·
IF 5.1
Jiaoyuan Lu,Xiaojun Tang,Huiting Bi
Compared with α-, β- and γ-MnO2, δ-MnO2 possesses a large interlayer spacing, abundant active sites and high compatibility with aqueous electrolytes. Due to these advantages, δ-MnO2 is considered a potential candidate for efficient aqueous zinc-ion battery and high-safety energy storage systems. Nevertheless, its structural instability and suboptimal electrical conductivity hinder it from being an ideal electrode material. In this study, a 3D conductive framework was fabricated by uniformly integrating δ-MnO2 and ultrathin rGO nanosheets through a simple freeze-drying process. The introduction of rGO endows the δ-MnO2/rGO composites with a unique “conductive network–dispersion support” structure. The as-constructed 3D architecture effectively overcomes the intrinsically low conductivity of δ-MnO2 and decreases the charge transfer resistance. Meanwhile, the porous framework enlarges the electrode–electrolyte contact area, accommodates the volume variation and lattice distortion during Zn2+ insertion/extraction, and thus maintains structural integrity upon long-term cycling. Consequently, the δ-MnO2/rGO electrode exhibits excellent cycling stability, with a maximum specific discharge capacity of 127.6 mAh g−1 at 1 A g−1, which remains at 82.1 mAh g−1 after 600 cycles. The specific capacity is obviously better than that of δ-MnO2 (63.2 mAh g−1 after 450 cycles).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·Vol. 48
·期 71
·27557-27567
·
IF 7.2
Xiaobing Xu,Heng Ma,Wei Xu,Xueming Liu,Haifeng Chu,Lei Zhang,Xinglong Wu
Heterostructure and phase engineering are effective method to tune the electronic structure of MoS 2 , which can activate and boost its intrinsic catalytic activity. Herein, the theoretical calculations reveal that the free energy of H∗ adsorption (ΔG H∗ ) for Mo 2 C (−0.65 eV) is lower than MoS 2 (2.05 eV), which is favorable for hydrogen adsorption. Inspired by the theoretical predictions, we develop a facile strategy to prepare nanostructured Mo 2 C/MoS 2 dispersed on reduced graphene oxide (rGO) via a hydrothermal preparation and carburization reaction. Since the Mo 2 C/MoS 2 -rGO nanostructures with great deal of both MoS 2 and Mo 2 C edges by heterostructure and phase engineering, which can induce massive active sites for HER on the surface of rGO, the intimate interfacial coupling effect between Mo 2 C and MoS 2 can effectively improve the charge transfer rate. The Mo 2 C/MoS 2 -rGO catalyst exhibits exceptional HER properties, delivering a high turnover frequency (TOF) of 0.209 s −1 at an overpotential of 200 mV in 0.1 M KOH. This work may open a new window for designing NPM electrocatalysts with highly efficient HER property based on earth-abundant materials.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能量转换
·
催化
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Nanomaterials
·
2023
·Vol. 13
·期 5
·917
·
IF 5.3
Donglin Li,Junfeng Lu,Xuanji Zhang,Dingfeng Jin,Hongxiao Jin
Nanoscale heterostructured zinc oxide/reduced graphene oxide (ZnO/rGO) materials with p–n heterojunctions exhibit excellent low temperature NO2gas sensing performance, but their doping ratio modulated sensing properties remain poorly understood. Herein, ZnO nanoparticles were loaded with 0.1~4% rGO by a facile hydrothermal method and evaluated as NO2gas chemiresistor. We have the following key findings. First, ZnO/rGO manifests doping ratio-dependent sensing type switching. Increasing the rGO concentration changes the type of ZnO/rGO conductivity from n-type (<0.6% rGO) to mixed n/p -type (0.6~1.4% rGO) and finally to p-type (>1.4% rGO). Second, interestingly, different sensing regions exhibit different sensing characteristics. In the n-type NO2gas sensing region, all the sensors exhibit the maximum gas response at the optimum working temperature. Among them, the sensor that shows the maximum gas response exhibits a minimum optimum working temperature. In the mixed n/p-type region, the material displays abnormal reversal from n- to p-type sensing transitions as a function of the doping ratio, NO2concentration and working temperature. In the p-type gas sensing region, the response decreases with increasing rGO ratio and working temperature. Third, we derive a conduction path model that shows how the sensing type switches in ZnO/rGO. We also find that p–n heterojunction ratio (np–n/nrGO) plays a key role in the optimal response condition. The model is supported by UV-vis experimental data. The approach presented in this work can be extended to other p–n heterostructures and the insights will benefit the design of more efficient chemiresistive gas sensors.Keywords:p–n junctions;ZnO;reduced graphene oxide;rGO;NO2sensing
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Xiaolong Zhang,Bo Li,Tingting Chen,Xiang Ke,Rengui Xiao
This manuscript presents a modification method by using nanofillers for simultaneously improving the barrier and corrosion inhibition in epoxy coatings. In this method, polyaniline (PANI) nanofibers are first grown on reduced graphene oxide (RGO) using an in situ polymerization reaction, and then cerium phosphate (CePO 4 ) nanograins are directly modified onto polyaniline/reduced graphene oxide (PANI/RGO) composites using a hydrothermal reaction . A new hydrophobic and corrosion-resistant PANI/RGO/CePO 4 nanocomposite is successfully prepared. Physical and chemical characterization was performed by Fourier transform infrared spectroscopy (FT-IR), ultraviolet–visible spectroscopy (UV–Vis), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (SEM). PANI/RGO/CePO 4 nanomaterials were compounded into epoxy resin and sprayed on Q235 carbon steel, and their corrosion resistance performance was tested by using AC impedance spectroscopy and salt spray tests. The results show that PANI/RGO/CePO 4 nanocomposites improve the barrier properties of epoxy resin. In addition, X-ray photoelectron spectroscopy (XPS) before and after corrosion showed that the cerium ions and phosphate ions released from CePO 4 in the composite had a corrosion inhibition effect. It forms cerium oxide and iron phosphate corrosion inhibition films on mild steel and cuts off direct contact between the electrolyte and the substrate. This nanomaterial-loaded epoxy coating can greatly improve the composite's anti-corrosion ability.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2022
·
IF 2.345
Yu Huang,Qingfang Niu,Le Jian,Wengui Zhao,Yuan Li,Wenjuan Dong,Kai Zhang,Wenting Liang,Cheng Yang
Zirconium-porphyrin metal-organic framework (PCN-224) hybridized reduced graphene oxide (PCN-224/rGO) was coupled with gold nanoparticles (Au NPs) to form a novel nanocomposite (PCN-224/rGO@Au). The PCN-224/rGO@Au has been served as a sensing interface for electrochemical determination of Cu 2+ via differential pulse voltammetry (DPV) approach. The PCN-224 contains the active site for capturing Cu 2+ and exhibits as a biomimetic catalyst to reveal a higher catalytic performance to target Cu 2+ . Simultaneously, the rGO and Au NPs provide good electrical conductivity and efficient catalytic activity as an electrochemical indicator. Under the optimized determining conditions, the peak current of Cu 2+ was linearly proportional to the concentration over the range of 5–150 µM with the LOD of 1.5 µM (S/N = 3). This approach exhibits good sensitivity, selectivity as well as great stability, which can accurately determine the content of Cu 2+ in the real water samples.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yanyan Chen,Manlin Zhang,Tiantian Chen,Ganbing Zhang,Hui Xu,Hongwei Sun,Lizhi Zhang
The application of powdered nanoscale zero-valent iron (nZVI) in conventional reactors for water treatment is limited by insufficient mass-transfer and difficult post-separation of catalysts. Herein, a novel microreactor was constructed by anchoring nZVI on the reduced graphene oxide/polypyrrole nanocomposite (rGO/PPy) substrate within the microchannel of a stainless-steel tube through two-step electrodeposition , which catalyzed the Fenton-like reaction to remove > 99% p-nitrophenol (PNP) within 50 s, outperforming traditional batch reactors. The rGO/PPy composite substrate consolidated the adhesion on steel surface, stabilized the nZVI by forming electron-transfer complex, facilitated the decomposition of H 2 O 2 to free •OH, and promoted the redox cycle of Fe(III)/Fe(II) via the electron donating capacity of rGO/PPy. Besides, the significant convection and highly-effective mass transfer within the microreactor also contributed to the ultrafast PNP removal. With acceptable durability, easy re-generation, and scalability, the rGO/PPy/nZVI microreactor is promising for the ultrafast removal of pollutants from water.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 12
·127518
·
IF 4.386
Ning Dai,Guohua Shi,Tingting Li,Nan Liu,Zhongkai Xu,Zhe Chen,Xiaohong Sun,Jiefang Sun,Ruisong Guo,Chunming Zheng
Dopamine is an important neurotransmitter for organisms and affects their function, so monitoring and detecting dopamine levels are essential. Sensitivity and selectivity of electrochemical sensors for the detection of dopamine usually rely on hybrid nanocomposites. In this context, we designed a micro-regionally restricted hybrid nanocomposite by modulating the micro-nano structure. Using functional groups on nitrogen-doped reduced graphene oxide (N-rGO) to restrict the random growth of tungsten disulfide nanosheets, we obtained a 2D layered material with bidirectional structural support to achieve high specific surface and high activity for application in robust and novel dopamine electrochemical sensors. A facile electrochemical sensor for dopamine detection was fabricated by modifying a screen-printed carbon electrode with the nanocomposite. The sensor exhibits excellent performance of dopamine detection in the wide range of 1 μmol l−1–100 μmol l−1 with a detection limit of 0.2 μmol l−1 and a high sensitivity of 0.56 μA μmol−1 l−1. The optimized sensor shows a good selectivity, satisfactory long-term stability and reproducibility towards DA and a separation of peak potential of 142 mV with uric acid. In addition, the prepared sensor provides favorable recovery in human serum and artificial cerebrospinal solution (aSCF), indicating great potentials in electrochemical detection and biological sensing applications.
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IONICS
·
2023
·Vol. 29
·期 4
·1571-1578
·
IF 2.8
Zhang Sheng-Feng,Li Jing,Wei Mei-Jie,Kong Fen-Ying,Zhang Rui,Wang Zhong-Xia,Fang Hai-Lin,Wang Wei
Herein, a fast, inexpensive, and sensitive electrochemical approach for the quantification of 6-gingerol in the ginger samples was established. Au nanoparticles-ZnO-reduced graphene oxide (AuNPs-ZnO-rGO) nanocomposites were fabricated and employed as electrode-modified materials to improve the sensitivity of the determination. UV–visible (UV–vis), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS) characterization elucidated the successful fabrication of AuNPs-ZnO-rGO nanocomposites. Voltammetry investigation demonstrated the excellent electrocatalytic activity of AuNPs-ZnO-rGO nanocomposites toward the redox reaction of 6-gingerol. Using the best experimental conditions (pH: 2.0 BR; the amount of AuNPs-ZnO-rGO suspension: 6 μL; accumulation time: 120 s), the linearity of the peak currents relied on the concentration of 6-gingerol from 0.1 to 100 μM with a detection limit of 0.03 μM (S/N = 3). The developed approach was successfully implemented for the quantification of 6-gingerol in ginger samples, with recoveries of 99.07‒102.1%.
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