JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Pulin Hao,Mingzhu Hu,Rong Xing,Wenjun Zhou
Methylparaben (MeP), as emerging contaminants widely used in pharmaceuticals and personal care products , have potential endocrine disrupting effect. In this study, the copper ferrite (CuFe 2 O 4 ) nanoparticles were uniformly distributed on graphene oxide (GO), and the performance and mechanism of CuFe 2 O 4 -rGO composites in activating persulfate (PS) for MeP degradation were comprehensively investigated. Results showed that the CuFe 2 O 4 -rGO composites exhibited much better efficiency for MeP degradation than CuFe 2 O 4 , and the synergistic effect between CuFe 2 O 4 and GO in CuFe 2 O 4 -rGO composite was also observed. The best catalytic performance of CuFe 2 O 4 -rGO composites was obtained at the mass ratio of 4:1 for CuFe 2 O 4 to GO and at neutral pH. X-ray photoelectron spectroscopy (XPS) results suggested that graphene in the composites mainly served as an electron shuttle to mediate electron transfer reactions. Electron paramagnetic resonance (EPR) and the quenching experiments further revealed that both hydroxyl and sulfate radicals were the major reactive species, and non-radical process also occurred during the reaction. Meanwhile, the degradation pathways of MeP involving hydroxylation, decarbonylation and ring opening were rationally proposed based on computational method and intermediates identification. All these results could provide insight into persulfate activation by CuFe 2 O 4 -rGO nanocomposites in environmental control applications.
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高影响因子
RSC Advances
·
2024
·Vol. 14
·期 3
·2088-2101
·
IF 3.9
Yanling Lv,Shixiang Lu,Wenguo Xu,Yulin Xin,Xiaoyan Wang,Shasha Wang,Jiaan Yu
Novel 2D material-based supercapacitors are promising candidates for energy applications due to their distinctive physical, chemical, and electrochemical properties. In this study, a dandelion-like structure material comprised of Sm2O3, Co3O4, and 2D reduced graphene oxide (rGO) on nickel foam (NF) was synthesised using a hydrothermal method followed by subsequent annealing treatment. This dandelion composite grows further through the tremella-like structure of Sm2O3 and Co3O4, which facilitates the diffusion of ions and prevents structural collapse during charging and discharging. A substantial number of active sites are generated during redox reactions by the unique surface morphology of the Sm2O3/Co3O4/rGO/NF composite (SCGN). The maximum specific capacity the SCGN material achieves is 3448 F g−1 for 1 A g−1 in a 6 mol L−1 KOH solution. Benefiting from its morphological structure, the prepared composite (SCGN) exhibits a high cyclability of 93.2% over 3000 charge–discharge cycles at 10 A g−1 and a coulombic efficiency of 97.4%. Additionally, the assembled SCGN//SCGN symmetric supercapacitors deliver a high energy density of 64 W h kg−1 with a power density of 300 W kg−1, which increases to an outstanding power density of 12 000 W kg−1 at 28.7 W h kg−1 and long cycle stability (80.9% capacitance retention after 30 000 cycles). These results suggest that the manufactured SCGN electrodes could be viable active electrode materials for electrochemical supercapacitors.
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Guoxin Ding,Chenfeng Sun,Meiyi Wang,Yuexiang Hu,Guojun Cheng,Jun Liu
The 2D nanomaterial has been widely used in the field of electromagnetic wave absorption because of its high specific surface area and special electrical properties. In this work, three 2D materials were integrated to form a unique ternary composite with Ti 3 C 2 T x MXene as the substrate, RGO as the intercalator with additional components, and CoFe-LDH loaded on the MXene/RGO surface. The interfacial and dipole polarizations were notably enhanced due to the abundant formation of heterogeneous interfaces between the three 2D materials and their corresponding abundant functional groups and defects, and the space between the 2D lamellae enabled multiple reflections of electromagnetic waves. Compared with pure MXene, the MXene/RGO/CoFe-LDH composites exhibited excellent electromagnetic wave absorption performance due to the synergy of multiple loss mechanisms, resulting in the best reflection loss value of −58.9 dB at 13.12 GHz.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Ying Yang,Qiao Liu,Xing-Pei Liu,Ping-Zhen Liu,Chang-Jie Mao,He-Lin Niu,Bao-Kang Jin,Sheng-Yi Zhang
A novel multifunctional reduced graphene oxide (RGO)/Fe 3 O 4 /PDDA/CdSe nanocomposite has been successfully prepared and used as probe for an electrochemiluminescence (ECL) immunosensor of human interleukin-6 (IL-6). The prepared RGO/Fe 3 O 4 /PDDA/CdSe nanocomposite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–vis) absorption spectroscopy , and a vibrating sample magnetometer (VSM). This nanocomposite shows magnetism, ECL properties, and good biocompatibility. Furthermore, the RGO/Fe 3 O 4 /PDDA/CdSe nanomaterial was applied to develop an ultrasensitive ECL immunosensor for detection of IL-6. The ECL intensity decreased linearly with the IL-6 concentrations in the range 0.002 to 20 ng/mL. Furthermore, the developed ECL immunosensor with high sensitivity, stability and excellent reproducibility can be used for detection of real samples, which make it possible to be used in clinical detection.
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高影响因子
Journal of Sulfur Chemistry
·
2024
·
IF 2.1
Yuyang Wang,Tao Ge,Xinju Zhan,Song Liu,Yulu Wei,Yueyue Qiao
The incomplete reduction of graphene oxide (GO) yields reduced graphene oxide (rGO), characterized by a zero band gap and intrinsic layer stacking, thus constraining its practical utility across diverse domains. Fortunately, this challenge can be effectively addressed by employing a suitable substrate for the fabrication of MoS2/rGO heterostructures. Nanocomposites of MoS2/reduced graphene oxide (MoS2/rGO-700W and MoS2/rGO-560W) were synthesized using MoS2 and GO solutions as starting materials through microwave-assisted synthesis with microwave power treatments of 700W and 560W, respectively. Structural characterization results reveal that the particle size of MoS2 within the composites is notably smaller compared to that of pure MoS2. The MoS2/rGO-700W composite demonstrates a more homogeneous dispersion of MoS2 and features a well-developed hierarchical porous structure with increased pore volume and specific surface area. The MoS2/rGO-700W composite demonstrates elevated ID/IG ratio, C/O ratio and C = C peak area, suggesting that increased microwave power enhances the removal of oxygen-containing groups from rGO. This process significantly restores the extended conjugated structure of graphene, thereby offering enhanced conductivity at the MoS2 interface. Furthermore, the proposed strategy holds considerable theoretical value and provides significant insights for the development process of novel MoS2-based composite electrode materials.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Lihong Liu,Bo Li,Ming Yang,Yannan Mu,Duo zhang,Lihua Huo
Metal oxide and graphene composite material have been a promising material for developing electrochemical sensors. In this work, we prepared graphene (rGO) doped MoO 2 hollow nanosphere composite (MoO 2 /rGO) using a simple one-step solvothermal without any template.The hollow nanosphere was constructed by nanoparticles and uniformly anchored onto graphene sheets.The dopamine (DA) sensor was constructed by modifying the MoO 2 /rGO composite to the glass carbon electrode (GCE) surface with a simple drop coating (MoO 2 /rGO/GCE), which shows high sensitivity(101.20 μA·μM -1 ·cm -2 ), low detection limit (6.8 nM), high selectivity and good stability for DA. Meanwhile, the MoO 2 /rGO/GCE demonstrates very little interference with dopamine determination when both Uric acid (UA) and ascorbic acid (AA) are present. The exceptional efficacy of the sensor is attributed to the MoO₂/rGO composite's unique attributes,which include a hollow structure, low charge transfer resistance, a large electrochemical active area, and an abundance of active sites. Furthermore, the MoO₂/rGO/GCE sensor demonstrates capabilities for the detection of minute dopamine levels in human serum, utilizing the standard addition method. This suggests its applicability in the realm of biomedical diagnostics.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dongmin An,Jialun Dai,Zongwei Zhang,Yingyue Wang,Nan Liu,Yunling Zou
In this study, series of rGO/SnO 2 nanocomposites were synthesized with hydrothermal method by mixing graphene oxide (GO) solution and pre-prepared SnO 2 quantum dot solution. The phase structure and morphology of the as-obtained rGO/SnO 2 nanocomposites were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis absorption spectrums, Raman spectroscopy, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) technique. The detailed investigation of gas-sensing properties of rGO/SnO 2 nanocomposites-based sensors exhibited that the gas response of SnO 2 -based sensors to ethanol gas increased with the addition of GO, especially when the GO dosage reached 3.3 wt%, which revealed the highest response value of 48.34–50 ppm ethanol gas at 120 °C. Besides, it also displayed an excellent selectivity, good repeatability and long-time stability. The mechanism of rGO functionalized SnO 2 and enhanced ethanol gas sensing property at relative low temperature was proposed.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Guanshu Zhao,Jing Ding,Fanyang Zhou,Qingliang Zhao,Kun Wang,Xueqi Chen,Qingwei Gao
A novel W doped BiVO 4 with rich oxygen vacancies (OVs) oriented on reduced graphene oxide (rGO) photocatalyst (W-BiVO 4-x /rGO) was developed by a simple one-step microwave hydrothermal method for efficient removal of ciprofloxacin (CIP) and chlortetracycline (CTC) under visible light. The synergistic effect of W doping, BiVO 4 with OVs, and rGO on the enhancement of photocatalytic activity was clarified from experimental and Density Functional Theory (DFT) calculations results. W doping significantly improved the density of photo-generated charge carriers. The introduction of rGO enlarged the specific surface area, expanded the light absorption range, and promoted the charge transfer of BiVO 4 . OVs both narrowed the band gap and enhanced the generation of O 2 − . W doping and OVs both enhanced the interactions between BiVO 4 and rGO. The CIP degradation rate constant of W-BiVO 4-x /rGO photocatalyst was 1.73, 5.32, 6.43, and 10.70 times higher than those of W-BiVO 4 /rGO, BiVO 4 /rGO, W-BiVO 4 , and BiVO 4 , respectively. Besides, W-BiVO 4-x /rGO photocatalyst prepared by microwave hydrothermal method exhibited higher photocatalytic activity and better combination between materials. This study offers a new strategy to address the problem of antibiotic residues in wastewater.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Shiyu Jia,Lei Zha,Xiangbo Zhao,Shouli Bai,Ke Tian,Yongjun Feng
Based on the advantages of low cost, photoelectrochemical stability and non-toxicity of BiVO 4 , we prepared BiVO 4 photoanode by the classical electrodeposition method and grew Bi 2 S 3 in situ relying on its own bismuth source to construct a type-II heterojunction. The BiVO 4 /Bi 2 S 3 /rGO ternary photoanode exhibits excellent PEC performance under the synergistic effect of rGO modification and heterojunction. The results show that the photocurrent density of the BiVO 4 /Bi 2 S 3 /rGO photoanode at 1.23 V vs RHE reaches 2.40 mA·cm -2 , which is 3.4 times higher than BiVO 4 (0.70 mA·cm -2 ), the onset potential is negatively shifted by 140 mV compared with BiVO 4 , and the highest IPCE and ABPE efficiencies reach 39.68% and 0.24%, respectively, while the charge transfer resistance R ct was reduced to 163 Ω. The enhancement is attributed to the construction of the heterojunction and its synergistic effect with rGO, which is from extending the visible light absorption of the photoanode, promoting the effective separation of carriers, and accelerating of interface charge transfer as well as providing more active sites for water oxidation.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Dong Ma,Yanxiang Zhang,Mengchun Gao,Yanjun Xin,Juan Wu,Nan Bao
A composite of reduced graphene oxide (RGO) and InVO 4 nanofiber was successfully synthesized by an electrospinning technique. The as-collected fibers were calcined at 420 °C in air and then calcined at 550 °C in nitrogen gas to remove polyvinyl pyrrolidone (PVP), which could enable InVO 4 to crystallize and protect the RGO from oxidation. The InVO 4 in the composite illustrated a hollowed-out fibrous morphology and orthorhombic phase, and RGO nanosheets were nested in the InVO 4 nanofibers. The hybrid RGO could produce more hydroxyl groups and a higher oxygen vacancy density on the surface of RGO/InVO 4 composite. Compared with pure InVO 4 , the light absorption range of the as-prepared RGO/InVO 4 composite was expanded. In Rh B degradation, the RGO/InVO 4 hybrid nanofibers displayed a higher photocatalytic activity than pure InVO 4 nanofibers. The enhanced photocatalytic activity might be ascribed to the role of RGO as an electron transporter and acceptor in the composite, which could effectively inhibit the charge recombination and facilitate the charge transfer. The exported electron could attack an O 2 molecule to facilitate the generation of •O 2 − and •OH for the photodegradation process of Rh B.
研究领域:
材料科学
·
环境科学
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 20
·3699
·
IF 5.719
Congyi Qian,Xiaohui Liang,Mei Wu,Xingxin Zhang
A lightweight microwave-absorbing material with a strong electromagnetic-absorption capability of practical significance in the field of electromagnetic compatibility was obtained by adjusting the ratio of Fe3O4and rGO. A nanoparticle material with a chain-typed structure consisting of a combination of Fe3O4and rGO was produced by a hydrothermal method under an applied magnetic field. The electromagnetic loss property of the Fe3O4@rGO composites is studied in the frequency range from 2 to 18 GHz. In addition, the reflection loss and the mechanism of microwave absorption are explored. By changing the amounts of rGO, the electromagnetic loss of the Fe3O4@rGO composites can be effectively regulated, which obtain better reflection loss. The minimum reflection loss of the Fe3O4@rGO composites is −49.4 dB at 16.2 GHz only with a thickness of 1.75 mm. Thus, the Fe3O4@rGO composites have an extremely thin thickness and a strong electromagnetic wave absorption capacity, which is a candidate for the development of lightweight magnetic absorbing materials.Keywords:magnetic composites;microwave absorption;electromagnetic loss;lightweight
研究领域:
材料科学
·
电磁学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·9640-9649
·
IF 2.478
Ding Xiao,Fan Guang,Huang Yi,Wang Jianguo
Reduced graphene oxide-molybdenum disulfide (RGO-MoS 2 ) loaded Fe 3 O 4 nanoparticles composite (RGO-MoS 2 -Fe 3 O 4 ) is prepared via two-step hydrothermal reaction. RGO-MoS 2 possesses three dimension architecture structures. This structure can prevent RGO and MoS 2 nanosheets restacked together and provide substrates for the Fe 3 O 4 nanoparticle decoration. The sizes of Fe 3 O 4 are in the range of 5–20 nm. As a microwave absorbent: the minimum reflection loss (R L ) value is -47.67 dB at 17.44 GHz when the thickness is only 1.5 mm. The absorption bandwidth (R L < −10 dB) can reach 4.72 GHz with the thickness is 1.7 mm. Compared with the previously reported literature, RGO-MoS 2 -Fe 3 O 4 nanocomposite exhibits excellent microwave absorption performance and can be served as an light-weight microwave absorber.
研究领域:
材料科学
·
电磁学
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