ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Na Han,Weijing Wang,Xingshuai Lv,Wenxin Zhang,Chao Yang,Menglu Wang,Xiaohui Kou,Wei Li,Ying Dai,Xingxiang Zhang
Due to the complexity of harmful wastewater components, environmental and multifunctional materials are required for sewage purification. In this paper, a novel kidney-bean-skin-like hydrophilic porous polyacrylonitrile/reduced graphene oxide-g-poly(amidoxime)-loaded Ag+ (H-PPAN/rGO-g-PAO@Ag+/Ag) composite nanofiber membrane was fabricated by combining electrospinning and hydrolysis methods. The spinning solution was pumped at a rate of 0.4 mL/h with the voltage set at a constant value of 23 kV. Then, some of the −CN groups switched to hydrophilic −COOH groups via a hydrolysis method, which acts as a linker of GO-g-PAN, Ag+, and the polyacrylonitrile (PAN) matrix. A further step of chelation and thermal treatment were used for generating Schottky junctions between rGO-g-PAO@Ag+ and Ag. After five-cycle tests, it exhibited outstanding mechanical properties ensuring the filtration and purification performance of the H-PPAN/rGO-g-PAO@Ag+/Ag composite nanofiber membrane (i.e., the tensile strength was still 7.21 MPa, and the elongation was 61.53%) for simulated wastewater. The methods of thermal treatment and high-pressure Hg lamp irradiation promoted the reduction of GO to rGO and Ag+ to Ag particles, which endows the final product H-PPAN/rGO-g-PAO@Ag+/Ag with excellent photocatalytic and bactericidal properties. Its catalytic efficiency for dyes benzoic acid (BA), Rhodamine B (RhB), methylene blue (MB), and methyl orange (MO) was up to 99.8, 98, 95, and 91%. The antibacterial rate was 100% against Escherichia coli and 99% against Staphylococcus aureus. More importantly, the photocatalytic and antibacterial PAN-based nanofiber membrane can be simply scaled up, which provides the membrane with great potential in highly efficient wastewater treatment and augmenting water supply.
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高影响因子
Nanoscale
·
2018
·Vol. 10
·期 37
·17647-17655
·
IF 7.233
Ke Yang,Yu Yan,Haiyang Wang,Zhixuan Sun,Wen Chen,Hongtao Kang,Yi Han,Wenquan Zahng,Xiaohua Sun,Zhenxing Li
A novel copper/copper(I) oxide@carbon (Cu/Cu2O@C) core–shell nanocomposite monodispersed on the surface of reduced graphene oxide (defined as Cu/Cu2O@C-rGO) was synthesized using a one-step calcination of Cu-based metal organic frameworks (MOFs)/graphene oxide (GO) composite structure. The size of the resultant Cu/Cu2O@C core–shell nanoparticles (NPs) on the rGO layers were mainly distributed in range of about 90–100 nm with good dispersion, which was characterized using transmission electron microscopy. X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption isotherms, X-ray photoelectron spectrometry and thermogravimetric analyses were also carried out to characterize the structure and composition of the Cu/Cu2O@C-rGO. The catalytic performance of the Cu/Cu2O@C-rGO composite was evaluated using a reduction reaction from 4-nitrophenol to 4-aminophenol. It was demonstrated that the Cu/Cu2O@C-rGO composite exhibited an excellent catalytic performance, which can reach a nearly 100% conversion rate in 90 s with 0.1 mg of catalyst. This catalyst also showed a good performance for the degradation of other organic dyes such as methylene blue, methyl orange and rhodamine B. Additionally, the core–shell structure exhibited good stability and reusability for the reduction reaction, which was because of its relatively better oxidation resistance than that of the bare Cu NPs. This research provided an efficient and stable non-noble metal-based catalyst derived from the MOF/GO structure.
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高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 45
·15836-15847
·
IF 4.029
Liguang Dou,Yanna Wang,Yangguang Li,Hui Zhang
A series of novel hierarchical nanocomposite catalysts xCu@Cu2O/MgAlO-rGO were fabricated by calcination of CuxMg3−xAl-LDH/rGO precursors (LDH: layered double hydroxide, rGO: reduced graphene oxide, and x = 0.5, 1.0, and 1.5), obtained by a facile citric acid-assisted coprecipitation route, under a N2 flow upon in situ self-reduction of lattice atomic-dispersed Cu2+ by rGO. Systematic characterization reveals highly dispersed core–shell-like Cu@Cu2O nanoparticles near the border between vertically interconnected mixed oxide MgAlO nanoplates and rGO layers. All the obtained catalysts show extraordinary catalytic performances for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) at room temperature. The 1.0Cu@Cu2O/MgAlO-rGO shows the highest activity for complete conversion of 4-NP with an apparent rate constant (kapp) of 55.3 × 10−3 s−1, a normalized rate constant (knor) of 14 497 s−1 g−1 on an active Cu content, and an unprecedented recycling stability for 25 successive cycles, which are superior to those of the recently reported Cu- and Co-based metal nanoparticles and even compared favourably with those of the most active noble metal catalysts. The superior activity of 1.0Cu@Cu2O/MgAlO-rGO can be attributed to the highly dispersed core–shell-like Cu@Cu2O nanoparticles and the greatly enhanced four-phase synergistic effect among Cu, Cu2O, MgAlO and rGO upon calcination. Moreover, 1.0Cu@Cu2O/MgAlO-rGO shows an excellent efficiency in the fixed bed system for the treatment of simulated industrial effluents containing nitrophenols and organic dyes. The present cost-effective, highly efficient and reusable non-noble metal nanocatalyst would open a new pathway for future water remediation.
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高影响因子
Gels
·
2025
·Vol. 11
·期 4
·233
·
IF 5.3
Yue Wu,Kewei Zhao,Jingliu Wang,Chunhui Li,Xubao Jiang,Yudong Wang,Xiangling Gu
The practical application of flexible sensors in sound detection is significantly hindered by challenges such as information isolation, fragmentation, and low fidelity. To address these challenges, this work developed a composite hydrogel via a one-pot method, employing polyvinyl alcohol (PVA) as the first network, polyacrylic acid (PAA) as the second network, and two-dimensional nanomaterials—reduced graphene oxide (rGO)—generated through the redox reaction of polydopamine (PDA) and graphene oxide (GO) as conductive fillers. The uniformly distributed rGO within the hydrogel forms an efficient conductive network, endowing the material with high sensitivity (GF = 0.64), excellent conductivity (8.15 S m−1), rapid response time (350 ms), and outstanding stability. The synergistic interaction between PDA and PAA modulates the hydrogel’s adhesion (0.89 kPa), enabling conformal attachment to skin surfaces. The designed rGO@PVA-PAA hydrogel-based flexible sensor effectively monitors vibrations across diverse frequencies originating from five vocal cavities (head, nasal, oral, laryngeal, and thoracic cavities) during singing. Integrated with multi-position synchronization and Bluetooth wireless sensing technologies, the system achieves coordinated and efficient monitoring of multiple vocal cavities. Furthermore, the hydrogel sensor demonstrates versatility in detecting physiological signals, including electrocardiograms, subtle vibrations, and multi-scale body movements, highlighting its broad applicability in biomedical and motion-sensing applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yu Yang,Meng Du,Jiaxin Liang,Qian Xu,Wei Liu,Ang Li
The flow-through electroactive membrane adsorption method has been proved to be a promising strategy to enrich low-concentration phosphate. However, the challenges of selective adsorption of phosphate and poor regeneration restrict its industrial application. Here, this study proposed a novel bimetallic Mg-UiO-66@rGO electrode material through the introduction of Mg(II) into UiO-66, which possessed remarkable adsorption selectivity and optimal reproducibility among the reported electrode materials. The maximum phosphate adsorption capacity of Mg-UiO-66(13)@rGO (Zr/Mg = 3:1) was 62.81 mg⋅g −1 at 3.2 V. Furthermore, it maintained the excellent adsorption properties in the presence of all competitive anions and after 30 times of continuous adsorption–desorption. In actual wastewater, Mg-UiO-66(13)@rGO still represented excellent adsorption kinetics of 0.51 mg⋅(g⋅min) −1 and equilibrium adsorption capacity of 61.2 mg⋅g −1 . The superior selectivity of Mg-UiO-66@rGO was attributed to the establishment of coordinative unsaturated metal sites (CUMSs), thus increasing the adsorption sites. The synergic effect of electric field facilitates the breaking and formation of coordination bonds between charged ions and deeper binding sites, boosting the adsorption–desorption ability. Notably, the structural stability is also a key factor in promoting repeated material regeneration. This study advances electrode material to a new level by introducing CUMSs and bimetallic synergies.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jinjing Du,Yuehao Guo,JianGuo Zhang,Dongbo Wang,Tao Zhang,Yu Zhou,Yuxiang Yangxuan,Xun Liu,Bin Wang,Qian Li
In this paper, with the goal of developing a high-performance silicon-based negative electrode through a reasonable green design using simple magnesium thermal reduction and pickling combined methods. Specifically, we utilize inexpensive photovoltaic waste silicon mud as the silicon source to synthesize porous silicon. Subsequently, we utilized self-produced porous silicon as the raw material and graphene as the coating material to fabricate a graphene-coated porous silicon-based negative electrode material with excellent cycling stability. We employ the PW91 method, which is based on density functional theory (DFT) using the generalized gradient approximation (GGA), to compute the first principles of both silicon-based materials and graphene-coated silicon/graphene composites. The study revealed that the P-Si@RGO composite exhibited excellent electrochemical properties. When adding 150 mL of graphene oxide with a concentration of 0.2 mg/mL. Even after the 100th cycle at a current density of 100 mA·g −1 , the specific discharge capacity of the P-Si@RGO electrode remains high at 1167.6 mAh·g −1 . At the same time, the results of DFT calculations also show that graphene can improve the conductivity of silicon materials. In summary, the experimental results are consistent with the results of the first-principal calculation, indicating that the computer simulation can predict the accuracy of the experiment, verify the empirical conclusions, and indicate the direction for designing the experimental scheme.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Weiping Zhang,Guiying Li,Wanjun Wang,Yaxin Qin,Taicheng An,Xinyan Xiao,Wonyong Choi
A chemically modified Ag 3 PO 4 @MS 2 (M = Mo, W)/rGO composite was firstly synthesized via a liquid-exfoliation solvothermal method. The structure, morphology, optical properties and composition were characterized by X-ray diffraction, FT-IR spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectra and X-ray photoelectron spectroscopy, respectively. The characterization results indicated that compact structure could be obtained by using this typical method due to in-situ chemical modification, which could also control the sizes of Ag 3 PO 4 nano-sheets by adding MS 2 /rGO hybrids. More importantly, the resultant Ag 3 PO 4 @MS 2 /rGO composite exhibited higher photocatalytic activity and stability toward the degradation of 4-nitrophenol than pure Ag 3 PO 4 under sunlight irradiation. The stable structure of Ag 3 PO 4 @MS 2 /rGO was closely related with Z-scheme electronic structure and electrical conductivity of MS 2 /rGO hybrids, leading to a higher consumption and transfer of photogenerated electrons. However, by controlling the amounts of MS 2 /rGO hybrids, more stable but lower photocatalytic activity composites could be obtained. Further analysis found that the holes and O 2 − were the main reactive species involved in the photocatalytic degradation of 4-nitrophenol. In addition, possible photocatalytic degradation pathways of 4-nitrophenol were also proposed based on the identified intermediates. The findings of this work may provide a new method to design efficient composites for photocatalytic degradation of organic pollutants .
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Zewei Zhang,Xiaoqi Song,Ting Yu,Xiping Lei
Thanks to their high energy density, small size, and light weight, lithium-metal batteries have been widely used over an extended period. However, lithium ions cannot be uniformly deposited, and their poor heat resistance hinders the practical application of lithium-metal batteries. Therefore, it is necessary to design a kind of separator with high electrolyte affinity and good heat resistance in order to improve the problem of a commercial separator. In this study, reduced graphene oxide (rGO) and polyphenylene terephthamide (PPTA) were combined in different ratios and coated onto one side of a commercial polypropylene (PP) separator using a feasible coating technique. A comparison of electrolyte absorptivity and flame retardancy revealed that the composite separator exhibited superior properties compared to those of a PP separator. The rGO2/PPTA3@PP separator with hierarchical porosity and flame-retardant properties, exhibited high ion conductivity (0.59 × 10−3 S cm−1) and an improved lithium-ion transfer number (0.57) at room temperature. By using the composite separator in an LiFePO4‖Li battery, the discharge specific capacity could still reach 125.6 mA h g−1 even after 100 cycles under 1C. After undergoing a high–low temperature cycle, the average discharge specific capacity could remain 151 mA h g−1 at 50 °C and 51 mA h g−1 at −10 °C. In addition, after 1100 h cycles in the assembled Li‖Li symmetric battery, no obvious lithium dendrites appeared on the lithium metal surface, indicating that the composite separator could successfully inhibit the growth of lithium dendrites. This study presents a promising approach for the large-scale production of novel composite separators with high electrochemical performance and safety.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zheng Li,Xin Song,Wenke Li,Xiaolong Ding,Lianjie Li,Meijun Liu,Lanhe Zhang,Chuntao Zhu,Zicheng Chen
A novel lithium (Li) ion-imprinted composite membrane (IIP@PPy/rGO@PVDF) was developed for the selective recovery of Li + through an external-voltage-driven process. This membrane was synthesized by integrating ion-imprinting technology with electrochemically switched ion exchange technology, presenting a highly promising technique for the efficient extraction of Li from brine. The IIP@PPy/rGO@PVDF membrane consisted of polypyrrole (PPy), reduced graphene oxide (rGO), 12-crown 4-ether (12C4), and ethylene dimethacrylate (EDGMA). Furthermore, leveraging the electric field and specific recognition of 12C4 toward Li + , the membrane exhibited excellent ionic adsorption performance, including a high adsorption capacity of 214 mg.g −1 , a superior retention ratio (Maintaining the initial value even after 10 cycles of electrochemical adsorption–desorption), a short equilibration time of <25 min, and an adsorption capacity of 98 mg.g −1 at pH = 1. Subsequently, variations in the average heat of adsorption indicated that the electric field enhanced the adsorption performance. These performances were attributable to the synergistic effects of rGO with PPy. Therefore, IIP@PPy/rGO@PVDF serves as an outstanding candidate for Li extraction in environments with high applied voltages and strong acidity.
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高影响因子
CARBON
·
2024
·
IF 10.5
Zhouai Luo,Pengju Han,Baokang Yu,Weiguang Yan,Xiaoxiao Chen,Yanlai Feng,Haimin Zheng,Hao Guo,Zhikang Cheng,Jianxin He
Textiles that exhibit electromagnetic shielding and high thermal conductivities are valuable materials. Graphene is considered the best candidate material because of its excellent thermal and electrical conductivities . However, there is a challenge that the strong interaction between the layers is easy to aggregate and affect the mechanical properties. At present, the graft modification of graphene can effectively improve its dispersion in solvents. Herein, we fabricate highly oriented composite fibers with “lotus root” structures via sol-gel wet spinning using graphene and aramid nanofiber (ANF) raw materials. The reduced graphene oxide (RGO)/ANFs composite fibers (50RGO/ANF-Ca 2+ -0.5) exhibit an excellent tensile fracture strength (304.05 MPa). The axial thermal conductivity of a single fiber is 30.42 W/(m·K) due to its highly oriented structure along the axis and dense three-dimensional network structure inside. Thermal infrared imaging shows that the 50RGO/ANF-Ca 2+ -0.5 textile has a higher surface temperature of 1.1 °C than commercial cotton fabric on human skin, and has a more significant heat dissipation capacity. The 50RGO/ANF-Ca 2+ -0.5 textiles exhibit electromagnetic shielding efficiencies of up to 49.8 dB. The composite fiber obtained via this low-cost preparation method endows textile with dual functions of thermal conductivity and electromagnetic shielding and has wide application prospects in emerging textiles.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Fan Li,Shang Sun,Lina Ma,Wenjing Zhang,Min Zhou,Yu Fu,Hengrui Guo,Xueying Su,Jinliang Shi,Hao Luo,Yang Yang
The intrinsically low electrical conductivity of elemental iodine and its slow redox kinetics represent two significant obstacles that hinder the commercialization of aqueous zinc-iodine batteries. These challenges can be addressed by modulating the adsorption-desorption equilibrium of iodide ions in the active material. This study presented a synergistic strategy of “Electronic Modulation” and “Phase Transition Engineering” to optimize the catalytic adsorption-desorption dynamics. A dual-designed Fe ions doped VO 2- x heterostructure anchored on reduced graphene oxide (Fe-VO 2- x /rGO) is demonstrated to synchronously adjust iodine adsorption and boost redox kinetics. The Fe-induced electronic structure modulation elevated the d-band center of vanadium, creating catalytic sites to promote the desorption of iodide ions and facilitate their diffusion. Concurrently, the phase transition from VO 2- x to V 2 O 5- n within the heterostructure establishes a 3D conductive network, synergizing with rGO to ensure rapid ion/electron transport. This “adsorption-catalysis-transport” collaborative mechanism enabled the Fe-VO 2- x /rGO cathode to achieve an ultrahigh capacity retention of 81.48% after 60,000 cycles at 20 A g −1 , surpassing state-of-the-art zinc-iodine systems. The work provides a paradigm for manipulating interfacial dynamics through electronic and crystallographic dual regulation in conversion-type batteries.
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RSC Advances
·
2017
·Vol. 7
·期 5
·2415-2425
·
IF 3.108
Ying Yang,Lin Zhu,Feng Xia,Baoyou Gong,Anjian Xie,Shikuo Li,Fangzhi Huang,Shaohua Wang,Yuhua Shen,David T. Weaver
In this study, a novel drug-loaded inorganic nanoparticle–biomolecule hybrid hydrogel shell containing fluorouracil (5-FU)/reduced graphene oxide (rGO)/Brassica chinensis extract (Bce) on tumor cells was firstly constructed through a facile one-step method. The Bce stems from a natural green vegetable for improving the bio-compatibility of 5-FU/rGO/Bce hydrogel and presents multi-functions in this system. As both a reducing and a cross-linking agent for GO, Bce is beneficial for the fast formation of a rGO/Bce hybrid hydrogel at body temperature (37 °C) before laser irradiation, as well as being an excellent photo-sensitizer for inducing the generation of cytotoxic singlet oxygen (1O2) to kill tumor cells by means of laser radiation. The rGO in the hybrid hydrogel possesses photothermal characteristic for the hyperthermia antitumor. After loading anticancer drugs, the formed 5-FU/rGO/Bce hybrid hydrogel shells encapsulated on the tumor cells in situ exhibit three competitive advantages, i.e., retaining the high concentration of drugs around tumor cells to enhance the localized antitumor effect, reducing the side effects by hindering drugs from migrating to normal tissue, and displaying effectively synergetic chemo/photo-thermal/photodynamic therapies. This study provides a new strategy to exploit the multi-functions of hybrid hydrogel materials for effective biomedical applications.
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