LANGMUIR
·
2024
·
IF 3.7
Haibao Zhang,Yongxing Lin,Chunhong Qiao,Liang Wang,Cheng Cai,Hui He,Xingyou Tian
Au nanotube-based composite membrane served as surface-enhanced Raman scattering (SERS) substrate with an ultralarge aspect ratio possesses an excellent flexibility and widely tunable surface plasmon resonance, and by introducing graphene oxide (GO) as a spacer layer, the SERS enhancement of the composite membrane is obviously better than those from the individual blocks of the Au nanotubes (AuNTS) membrane and the Au nanoparticle/graphene oxide (AuNP/GO) membrane. Such a “sandwich” (AuNP/GO/AuNT) structured membrane has a high SERS sensitivity and a wide tunability by controlling the size of Au nanoparticles and the thickness of graphene oxide, and the detection limits of the AuNP/GO/AuNT substrate for R6G and NBA are as low as 10–12 and 10–7 M, respectively; the large enhancement is attributed to the adsorption and chemical mechanism of graphene oxide and the physical mechanism of the Au nanoparticles and nanotubes (the electromagnetic field coupling between them).
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xia Zhan,Teng Huo,Mingxue Nie,Rui Ge,Juan Lu,Yunxuan Weng
Graphene oxide (GO) membranes show immense promise in nanofiltration separation for water purification and recycling of water resources. However, pristine GO membranes often suffer from insufficient membrane stability due to swelling and low water permeance under high operation pressure, which severely limits the real-world utilization of GO membranes. Herein, a strategy involving surface modification of GO membrane with superhydrophilic polyamide (PA) layer combined with cross-linking with biurea (BU) amine, is proposed to fabricate highly permeable and robust GO membranes for dye removal from aqueous solution. The PA layer is prepared onto BU cross-linked GO membrane by in-situ interfacial polymerization, which results in superhydrophilic and negative-charged membrane surface. Moreover, the low reactivity of 2,5-diaminobenzenesulfonic acid (DBS) monomer contributes to low cross-linking degree and loose network of PA layer. The BU cross-linked GO laminates possess multi-level interlayer spacings and sufficient covalent interaction between GO interlayer due to crosslinking with BU, which offer large and robust transport channels for water molecules. PA@BU/GO hybrid membrane shows the optimum pure water permeability of 140.2 L·m −2 ·h −1 ·bar −1 , with water permeance and TB rejection rate of 67.4 L·m −2 ·h −1 ·bar −1 and 99.9 %, respectively. Moreover, the membrane exhibits impressive dye/salt selectivity (the dye/NaCl separation factor is up to 873), long-term operation stability and good anti-fouling property, which makes it a potential candidate for the fractionation of dye/salts in textile wastewater. This work provides a promising idea for the development of high-performance 2D membranes with high-efficiency water transport channels using the synergistic effect of superhydrophilic PA Layer and robust BU cross-linked GO laminates.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Muhammad Saqib,Ali Asghar,Zhangwei Chen,Amal A. Abdel Hafez,Majed Y.A. Almashnowi,Qumail Arshad,Majed Yousef Awaji,Yasir Javad,Mohammed Kuku,Muhammad Shahid Rashid
Transition metal phosphates are gaining attention as an environmentally sustainable and high-theoretical capacity material for electrochemical energy storage devices. This study investigates the impact of adding functionalized graphene Oxide (GO) on the electrochemical sites of cobalt-phosphate (Co 3 (PO 4 ) 2 /GO composite) because of its high surface area and electrical conductivity to open up new possibilities for enhancing the performance of energy storage devices. Herein, nanoflakes like cobalt phosphate and composites with graphene oxide were synthesized using a hydrothermal approach. The crystallinity, morphological effect, and chemical compositional analysis were analyzed via XRD, SEM, and EDS. Then, the electrochemical performance is measured in two different setups, i.e., 2-electrode and 3-electrode cell assembly. In the 3-electrodes setup, the cobalt phosphate/GO composite revealed a high specific capacity of 660 C/g, corresponding to 5 mV/s compared to the individual. In the device performance, cobalt phosphate/GO is utilized as +ev electrode, whereas -ev electrode consists of activated carbon in supercapattery. In their results, the assembled devices produced a specific capacity of 458 C/g with remarkable energy and power density of 82.69 Wh/kg and 433.33 W/kg corresponding to a current density of 0.7 A/g, respectively, with good capacitive retention of 94.77 % after 6 K cycles. Moreover, the theoretical calculation measure from Dunn's model reveals a capacitive contribution increased from 35.51 % to 71.12 % with an increase in scan rates. The study offers a new avenue for advanced energy storage applications.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
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IF 2.625
Weiyi Chen,Xiaojun Niu,Jie Wang
A series of graphene oxide (GO)/Ag 3 PO 4 composites were synthesized using ion exchange-chemical precipitation method with different GO content, and the photocatalytic reduction degradation effect on decabromodiphenyl ether (BDE-209) over GO/Ag 3 PO 4 was also studied. The optimized composite exhibited superior photocatalytic activity. When the content of GO was 7%, the degradation efficiency of BDE-209 could reach 97.33% in anoxic water with methanol as electron donors after 8 h of visible light irradiation, being 3 times that over pure Ag 3 PO 4 and the BDE-209 reduction generated 3Br-8Br PBDEs congeners. The photocatalytic degradation of BDE-209 has been further investigated under different reaction conditions, such as photocatalyst dosage and pH of reaction system. According to analysis of the intermediates’s generation, accumulation and distribution, we proposed that the BDE-209 reduction mechanism was the multi-electron reduction process. GO not only trapped electrons to improve the charge separation on Ag 3 PO 4 , but also fleetingly transferred the accumulated electrons to BDE-209. This study indicates that GO/Ag 3 PO 4 could be a promising material for environmental treatment of persistent pollutants.
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Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Fazal Muhammad Khoso,Jin-Gang Yu
Background Self-assembled GO-based 3D composites with porous or layered architectures have shown distinct qualities in terms of excellent selectivity and high stability. The functionalization of GO with N- and S-rich compounds can enhance its selectivity by increasing active sites for the adsorption of Cd 2+ . Method By decorating GO with 2-mercapto-1,3,4-thiadiazole (MTD), a novel, environment-friendly, and cost-effective 3D MTD@GO 2:1/100 ° C/2 h composite with abundant active sites was successfully fabricated using a convenient facile one-step hydrothermal method. The 3D MTD@GO 2:1/100 ° C/2 h composite demonstrated exceptional selectivity and efficiency in removing Cd 2+ from aqueous solutions. Significant findings The batch adsorption studies were conducted to enhance the adsorption efficiency of 3D MTD@GO 2:1/100 ° C/2 h composite toward Cd 2+ ions, and an excellent adsorption capacity of 37.176 mg∙g -1 was obtained under optimized conditions ( t = 40 min, pH= 7, T = 298 K). The adsorption kinetic, isothermal, and thermodynamic studies showed that adsorption data were better demonstrated with the pseudo-second-order model ( R 2 = 0.999), and the Langmuir isotherm model suggested that the heterogeneous, surface chemisorption at monolayer coverage was the rate-limiting step, and the adsorption was endothermic. Analytical techniques such as SEM for morphology, elemental mapping analyses, and EDS, The Brunauer-Emmett-Teller (BET) method was used to determine the specific surface area (SSA), while the Barrett-Joyner-Halenda (BJH) method was utilized to analyse the pore size distribution., Zeta potential for surface charge, TGA for thermal stability, FT-IR for functional groups, and XPS were used to understand the adsorption mechanism and characterize the prepared 3D MTD@GO 2:1/100 ° C/2 h composite. The 3D MTD@GO 2:1/100 ° C/2 h composite with good stability also had a strong possibility of Cd 2+ ion recovery ( R = 92.94 %) from aqueous solution, and a promising ability to be reused for up to seven cycles. With these prominent qualities of selective adsorption for Cd 2+ ions, the 3D MTD@GO 2:1/100 ° C/2 h composite can be a suitable and sustainable material for wastewater treatment in practice.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Decai Yang,Yongqi Li,Fuhua Mao,Chao Qu,Lanyang Wang,Youguo Luo,Kexin Shi,Qing Ye
Recently, a visible-light-driven photocatalysis coupled peroxydisulfate (PDS) activation system was developed for improving the efficiency of antibiotics degradation in wastewater. A Z -scheme FeOOH/CNNS photocatalyst was successfully applied for tetracycline (TC) degradation. In this study, graphene oxide (GO) was introduced into the fabrication procedure of the former catalyst. The optimzed FeOOH/GO/CNNS photocatalyst achieved 98.8 % TC degradation within 40 min (k = 0.0964 min −1 ), which was 2.58 and 8.53 times compared to FeOOH/CNNS and CNNS, respectively. This significant improvement can be attributed to the fact that 2D porous CNNS and GO can increase the surface area and active sites, avoiding FeOOH aggregation. Next, narrow-bandgap FeOOH improves visible-light utilization, while GO acts as an interfacial bridge to form an all-solid-state Z -scheme heterojunction, accelerating carrier separation and inhibiting recombination. Finally, radical trapping confirms • O 2 − , • OH, SO 4 •- , and h + synergistically degrade TC. This design provides a novel strategy for PDS-based efficient photocatalytic advanced oxidation.
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Theranostics
·
2019
·
IF 8.063
Lingling Ou,Yong Lan,Zhiqiang Feng,Longbao Feng,Junjie Yang,Yu Liu,Liming Bian,Jiali Tan,Renfa Lai,Rui Guo
Evidence indicates that microRNAs (miRNAs) play vital roles in regulating osteogenic differentiation and bone formation. Methods : Here, we show that a polyethyleneimine (PEI)-functionalized graphene oxide (GO) complex efficiently loaded with the miR-214 inhibitor is assembled into silk fibroin/hydroxyapatite (SF/HAP) scaffolds that spatially control the release of the miR-214 inhibitor. Results : SF/HAP/GO scaffolds with nanosized GO show high mechanical strength, and their hierarchical microporous structures promote cell adhesion and growth. The SF/HAP/GO-PEI scaffolds loaded with mir-214 inhibitor (SF/HAP/GPM) were tested for their ability to enhance osteogenic differentiation by inhibiting the expression of miR-214 while inversely increasing the expression of activating transcription factor 4 (ATF4) and activating the Akt and ERK1/2 signaling pathways in mouse osteoblastic cells (MC3T3-E1) in vitro . Similarly, the scaffolds activated the osteoblastic activity of endogenous osteoblast cells to repair critical-sized bone defects in rats without the need for loading osteoblast cells. Conclusion : This technology is used to increase osteogenic differentiation and mineralized bone formation in bone defects, which helps to achieve cell-free scaffold-based miRNA-inhibitor therapy for bone tissue engineering.
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高影响因子
BMC Oral Health
·
2024
·Vol. 24
·期 1
·1-17
·
IF 2.6
Li Yaoyao,Huang Xinhui,Fu Weihao,Zhang Zonghao,Xiao Kuancheng,Lv Hongbing
Reduced graphene oxide (rGO) is an graphene oxide (GO) derivative of graphene, which has a large specific surface area and exhibited satisfactory physicochemical characteristics. In this experiment, GO was reduced by PDA to generate PDA-GO complex, and then PDA-GO was combined with Chitosan (CS) to synthesize PDA-GO/CS composite scaffold. PDA-GO was added to CS to improve the degradation rate of CS, and it was hoped that PDA-GO/CS composite scaffolds could be used in bone tissue engineering. Physicochemical and antimicrobial properties of the different composite scaffolds were examined to find the optimal mass fraction. Besides, we examined the scaffold’s biocompatibility by Phalloidin staining and Live and Dead fluorescent staining. Finally, we applied ALP staining, RT-qPCR, and Alizarin red S staining to detect the effect of PDA-GO/CS on the osteogenic differentiation of human dental pulp stem cells (hDPSCs). The results showed that PDA-GO composite was successfully prepared and PDA-GO/CS composite scaffold was synthesized by combining PDA-GO with CS. Among them, 0.3%PDA-GO/CS scaffolds improves the antibacterial activity and hydrophilicity of CS, while reducing the degradation rate. In vitro, PDA-GO/CS has superior biocompatibility and enhances the early proliferation, migration and osteogenic differentiation of hDPSCs. In conclusion, PDA-GO/CS is a new scaffold materialsuitable for cell culture and has promising application prospect as scaffold for bone tissue engineering.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 14
·B1293
·
IF 3.12
Yu Zhang,Qiang Xie,Zhi Xia,Guofeng Gui,Feng Deng
In this paper, a novel nanocomposite fulvic acid reduced graphene oxide (FA-rGO) and Co-phthalocyanine nanorods (CoPcNRs) was prepared and used to construct an electrochemical sensor for simultaneous detection of catechol (CC), hydroquinone (HQ), phenol (PN) and p-nitrophenol (p-NP). FA as reductant used to prepare FA-rGO nanocomposite, which fabricated by hydrothermal method and freeze-drying process. The method is environmentally friendly and realizes the gentle reduction of GO. CoPcNRs were synthesized by surfactant-assisted ultrasonic method. The microstructure and morphologies of the as-prepared materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Vis spectrophotometer. The electrochemical oxidation of CC, HQ, PN and p-NP was investigated using differential pulse voltammetry (DPV). The results show that the FA-rGO/CoPcNRs modified electrode exhibits excellent electrochemical activity toward the simultaneous redox of CC, HQ, PN and p-NP. Under optimal conditions, the linear ranges of CC, HQ, PN and p-NP were 1 μM–650 μM, 2 μM–450 μM, 2 μM–160 μM, 2 μM–140 μM, with 0.3 μM, 0.65 μM, 0.65 μM and 0.65 μM, respectively. In addition, the modified electrode showed good selectivity, sensitivity and stability. The application in real samples was also evaluated, and the recoveries suggesting that FA-rGO/CoPcNRs nanocomposites could be used as an excellent potential reaction platform for the simultaneous determination of CC, HQ, PN and p-NP in environmental samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yilin Wu,Rongxin Lin,Faguang Ma,Wendong Xing,Jia Gao,Xinyu Lin,Jian Lu,Chao Yu,Ming Yan
There has been plenty of attempts to engineer functional membranes with excellent comprehensive properties, figuring out how to both achieve excellent selectivity and permeation flux in one membrane is facing challenges. In this work, a subversive synthesis strategy with hierarchical structure was first proposed for the preparation of polymerization (PDA)-based activated carbon particles (ACPs)/GO nanocomposite imprinted membranes (P-AGNMs). A PDA-based imprinting process was initially performed on ACPs/GO surfaces to synthesize the PDA-based propranolol-imprinted sites, the P-AGNMs were then obtained through an innovative electrostatic spinning process. Based on the propranolol-imprinted PDA-ACPs/GO blended membrane structure, simultaneous benefits in both adsorption selectivity and permselectivity performance toward propranolol had been accomplished. Specifically, excellent rebinding capacity (54.9 mg g −1 ), fast adsorption kinetics and permselectivity coefficients (more that 3.5) could be easily obtained. Importantly, the optimized experimental results strongly suggested that the as-designed propranolol-imprinted sites from PDA-modified surfaces played crucial roles for obtaining increasing rebinding capacities of P-AGNMs. In addition, the as-prepared P-AGNMs were synthesized without complicated procedures and polluting the environment, which demonstrated that the as-designed synthesis methodology of P-AGNMs had great potential for applications in selective separation field.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yuhang Han,Yingyi Ma,Junming Zhang,Shun Yao,Kaizheng Xu
It is important to reduce dielectric constant while maintaining or improving water resistance and mechanical properties for the practical use of porous low-dielectric materials. Herein, a composite film in which GO and fluorinated PI (FPI) contained porous structure located on the surface of flat PI film was prepared by the simple breath figure method. The incorporation of GO/surfactant can break the design contradiction between low dielectric constant and high mechanical strength for porous structure, thereby realizing the synchronous promotion of dielectric and mechanical properties. Moreover, the water absorption of composite film was decreased significantly due to the synergy of fluorine atoms, porous structure and GO/surfactant, guarantee its high robustness to humid stress. The dielectric, water resistance and mechanical properties of the composite film could be regulated through varying the casting humidity and GO/surfactant content. A low dielectric constant of 2.3, water absorption of 0.6 % and high tensile strength of 122 MPa, with 31.11 % and 75.88 % of decrease and 26.99 % of increase compared to flat PI film was exhibited with the GO/surfactant loading of only 0.5 wt%. The dielectric constant of composite film is still below 2.5 after moisture treatment. These excellent properties facilitate the application of GO/PI composite film in microelectronics.
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Carbon Letters
·
2019
·Vol. 30
·期 4
·425-434
·
IF 1.807
Wang Jingjing,Wang Weimin,Wang Jinghua,Xu Kangzhen
For solving phase separation of nanoparticles and graphene oxide (GO) in the application process, MgWO 4 –GO nanocomposites were successfully synthesized using three different dispersants via a facile solvothermal-assisted in situ synthesis method. The structure and morphology of the prepared samples were characterized by X-ray diffraction, Scanning electron microscopy, Transmission electron microscopy, Fourier transform infrared and Raman techniques. The experimental results show that MgWO 4 nanoparticles are tightly anchored on the surfaces of GO sheets and the agglomeration of MgWO 4 nanoparticles is significantly weakened. Additionally, MgWO 4 –GO nanocomposites are more stable than self-assembly MgWO 4 /GO, which there is no separation of MgWO 4 nanoparticles and GO sheets by ultrasound after 10 min. The catalytic results show that, compared with bare MgWO 4 , MgWO 4 –GO nanocomposites present better catalytic activities on the thermal decomposition of cyclotetramethylenete tranitramine (HMX), cyclotrimethylene trinitramine (RDX) and ammonium perchlorate (AP). The enhanced catalytic activity is mainly attributed to the synergistic effect of MgWO 4 nanoparticles and GO. MgWO 4 –GO prepared using urea as the dispersant has the smallest diameter and possesses the best catalytic action among the three MgWO 4 –GO nanocomposites, which make the decomposition temperature of HMX, RDX and AP reduce by 10.71, 11.09 and 66.6 °C, respectively, and the apparent activation energy of RDX decrease by 68.6 kJ mol −1 .
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