ACS Omega
·
2023
·
IF 4.1
Jie Dong,Laixi Zhang,Wei Li,Xin Hu,Anyi Chen,Chaorui Li
In this study, a facile and cost-effective hydrothermal synthesis method was used to synthesize zinc oxide nanoflowers modified by reduced graphene oxide, and subsequently, trimetallic AuPtRu nanoparticles(AuPtRuNPs) were supported via the reduction method for high-sensitivity colorimetric detection of H2O2 in weakly acidic solutions. Compared to monometallic and bimetallic nanoparticles, trimetallic nanoparticles exhibit significant synergistic effects and enhanced catalytic activity. After providing a three-dimensional structure with multiple pores by zinc oxide and enhancing electron transfer ability by reduced graphene, the trimetallic nanocomposites (AuPtRu/ZnO-rGO) exhibited excellent peroxidase-mimicking activity, which can effectively catalyze 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue oxidation product (oxTMB) in the presence of H2O2. Compared to horseradish peroxidase (HRP), AuPtRu/ZnO-rGO demonstrated significantly enhanced catalytic velocity (Vmax = 6.16 × 10–8 M/s) and affinity (Km = 0.02) for H2O2. The study of the catalytic mechanism showed that trimetallic Au, Pt, and Ru could effectively catalyze H2O2 to produce hydroxyl radicals (•OH) to accelerate the oxidation of TMB and enhance the peroxidase-mimicking activity of the AuPtRu/ZnO-rGO nanocomposites. The results showed that the as-synthesized hydrangea-like AuPtRu/ZnO-rGO nanocomposites showed enhanced peroxidase-mimicking activity. It could be used for the colorimetric detection of H2O2 in the range 5–1000 μM with a LOD of 3.0 μM (S/N = 3), and the recoveries are 93.0–101.7%. In addition, the AuPtRu/ZnO-rGO nanocomposites have good applicability for sensitive colorimetric determination of H2O2 in milk, and it has broad application prospects as a multifunctional sensing platform in the food processing industry.
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Journal of Water Process Engineering
·
2023
·
IF 7
Fuwang Zhao,Yanling Yang,Siyang Ji,Rui Yu,Xing Li,Zhiwei Zhou
A photo-Fenton catalyst Fe‑carbon nitride (g-C3N4)/reduced graphene oxide (rGO) (labeled as FNGO) was prepared via two-step calcination thermal polymerization. rGO as a carrier of Fe-g-C3N4 accelerated the charge transfer and improved the reduction of Fe (III) as compared those of the binary Fe-g-C3N4 catalyst. The FNGO catalyst maintained a high surface area of 264.7 m2/g and its charge transfer rate was 2.77 times higher than Fe-g-C3N4. The decreasing transient photocurrent and increasing electrode resistance of FNGO, Fe-g-C3N4 and g-C3N4 confirm the positive synergistic effect of Fe N coordination and rGO in charge transfer. Under the synergistic of visible light irradiation and H2O2, the excellent degradation performance of FNGO towards rhodamine B was achieved (95.3 % removal) at Fe-doping content of 10 wt%, rGO loading content of 0.5 % and H2O2 addition of 1.5 mM. Hydroxyl radicals played a dominant role in the photocatalysis-Fenton system, which was related to the coordination of Fe N, the carrier off-domain of rGO, and the Fe (III)/Fe (II) cycle promoted by photogenerated electron and superoxide radicals. The FNGO had a high stability, a wide pH adaptation (3– 11) and a low Fe-leaching. This novel ternary light-driven photo-Fenton catalyst of FNGO enabled efficient decontamination during advanced treatment of wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ronghao Wu,Qu Zhang,Chao Xue,Zuliang Chen
17beta-estradiol (E2) is classified as an endocrine disruptor and it poses a significant threat to the environment. Despite our previous work on the preparation of green-reduced graphene immobilized Ochrobactrum sp. FJ1(FJ1@rGO) to achieve high efficiency in removing E2, the functions of strain FJ1 and rGO, as well as their removal mechanism of E2, remain not well understood. In this study, FJ1@rGO was used to remove E2 to comprehend the removal mechanism where efficiency was found to be 93.74% after 10 days of removal compared to only rGO (43.82%). This indicated that E2 degradation was based on the integration of adsorption using rGO and biodegradation through strain FJ1, as evidenced by HPLC-UV. Additionally, results confirmed that the E2 removal process by FJ1@rGO conforms to first-order degradation kinetics and pseudo-second-order kinetics, further demonstrating the synergistic effect of physical adsorption and biodegradation. LC-Q/TOF-MS analysis identified the primary degradation products as estrone (E1), 4-OH-E1, and catechol. Combining characterization analysis, rGO facilitates the transfer of electrons between cells and E2, improving the strain's tolerance of environmental changes. Finally, the assessment of various wastewaters showed that the removal efficiency was 99.76%, 96.89%, and 78.09%, respectively. Overall, the mechanism by FJ1@rGO to remove E2 was proposed here, providing new insights into green and sustainable technology for treating E2 in wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaowei Liu,Konghu Tian,Zhihong Chen,Chao Zhang,Jing Wang,Jinbo Zhu,Sheng Sun,Lixin Xu
Melamine-derived carbon foam (MDCF) and nickel–cobalt bimetallic nanosheet arrays (NiCo-BNSA) possess unique porous structures and excellent microwave absorption (MA) properties, making them potentially useful in MA applications. In this investigation, we fabricated NiCo-BNSA/reduced graphene oxide/MDCF (NiCo-BNSA/RGO/MDCF) composites utilizing a two-stage synthesis protocol. This process incorporated melamine foam (MF) pretreatment, carbonization, and a subsequent in-situ growth stage, resulting in the creation of a three-dimensional porous network structure. By adjusting the RGO volume, we were able to manipulate the structure and composition of the NiCo-BNSA/RGO/MDCF composites, leading to an enhancement in their MA performance. It was also observed that the NiCo-BNSA was evenly distributed on the surface of both the RGO and MDCF . The composites exhibited an optimal reflection loss ( RL min ) of −67.8 dB at a thickness of 2.50 mm, and by varying their thickness, the effective absorption bandwidth (EAB, RL ≤ -10 dB) extended to 9.80 GHz, encompassing the entire C and X bands. This study presents a novel approach for fabricating lightweight and efficient carbon-based MA composites.
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CHEMOSPHERE
·
2023
·
IF 8.8
Mian Hu,Zhibing Li,Xiaotong Huang,Meiqi Chen,Zhong-Ting Hu,Suqin Tang,I-Ming Chou,Zhiyan Pan,Qi Wang,Junliang Wang
To ascertain the reaction variables on o -chloroaniline ( o -ClA) mineralization, total nitrogen (TN) removal rate, and N-species distribution, o -ClA was subjected to catalytic supercritical water oxidation (CSCWO) in a fused quartz tube reactor (FQTR). The findings demonstrated that when the temperature, reaction time, and excess oxidant were 400 °C, 90 min, and 150%, respectively, the mineralization rate of o -ClA could reach more than 95%. Moreover, potential degradation pathways of o -ClA in supercritical water oxidation (SCWO) was proposed according to the GC-MS results. TN removal rate is significantly impacted by Ru/rGO, despite the fact that its catalytic effect on the mineralization of o -ClA was not particularly noteworthy. Compared with no catalyst, the TN removal rate of o -ClA obviously increased from 44.1% to 90.3% at 400 °C, 10 wt% Ru loading, 90 min and 200% excess oxidant. In addition, N-species distribution in SCWO and CSCWO were also investigated. Results indicated that the Ru/rGO catalyst could accelerate the oxidation of ammonia-N and convert it to nitrate-N, promoting N 2 generation. Finally, the possible N transformation pathway in CSCWO of o -ClA was proposed. As a result, this work offers fundamental information about o -ClA catalytic oxidation removal in the SCWO process.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jiale Zhou,Kunquan Li,Zhuohan Chen,Xiaojing Su,Huali Xie,Lei Yao,Yunhui Wu,Xiaofan Zhang,Lu Chen,Xuting Wu,Wenjian Wu
Functional membranes with electrothermal/photothermal effects are considered an effective method for separating water/viscous crude oil mixtures. However, the loading of photothermal and electrothermal particles in polymeric membranes with poor compatibility will deteriorate the membrane performance, leading to the unstable photothermal/electrothermal effects. Therefore, we prepared a hydrophobic sandwich structure polyvinylidene fluoride/reduced graphene oxide/polydimethylsiloxane (PVDF/rGO/PDMS) composite membrane using a two-step electrospinning process, which improved the binding force between the photothermal/electrothermal particles and the matrix with the composite membrane exhibiting super fast electric heating and photothermal effect. The temperature of the composite membrane surface rapidly reached to 162.5 °C within 30 s at 25 V. In addition, the addition of graphene (GO) improved the mechanical properties of the composite membrane. Meantime, the composite membrane possessed stable hydrophobicity and lipophilicity, which was beneficial for separating water/viscous crude oil mixtures. Owing to the controllable pore structure and special wetting behavior, the water-in-oil emulsion was successfully separated. Importantly, the separation rates of the water/crude oil mixtures under the electrothermal effect was 2340 kg·m −2 ·h −1 ·bar −1 . Thus, this study provides a new method for preparing hydrophobic sandwich-like PVDF/rGO/PDMS composite membrane with electrothermal/photothermal effects, which has significant potential for engineering applications in high-viscosity crude oil removal and water-in-oil emulsion separation.
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Friction
·
2023
·Vol. 11
·期 11
·2091-2106
·
IF 6.8
Zhou Yongjun,Zhang Yuanya,Liu Meng,Wang Yanling,Yuan Junya,Men Xuehu
Epoxy resin (EP) composites with satisfactory thermal and tribological performance are highly required for engineering moving components. However, the simple addition of fillers leaded to the serious filler agglomeration and limited promotion in tribological properties. In this work, we constructed a new kind of three-dimensional (3D) reduced graphene oxide (RGO)/Si 3 N 4 hybrid aerogel for EP composites, which was prepared by a facile hydrothermal self-assembly method followed by freeze-drying technique. As a result, the dispersibility of Si 3 N 4 whiskers was greatly improved through wrapping of polydopamine—polyethyleneimine copolymer (PDA—PEI) copolymer and physical spacing of 3D skeleton. Furthermore, benefiting from the synergistic effect of RGO and Si 3 N 4 @PDA—PEI in the thermal network, the thermal conductivity of RGO/Si 3 N 4 hybrid aerogel (GSiA)—EP increased by 45.4% compared to that of the neat EP. In addition, the friction coefficient and wear rate of GSiA—EP decreased by 83.7% and 35.8%, respectively. This work is significant for opening a tribological performance enhancement strategy though constructing 3D hybrid architecture.
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Environmental Science-Nano
·
2018
·Vol. 6
·期 1
·207-215
·
IF 6.087
Miao Peng,Guijian Guan,Hong Deng,Bin Han,Chen Tian,Junyang Zhuang,Yunyun Xu,Weizhen Liu,Zhang Lin
Considering p-arsanilic acid (p-ASA) as an organoarsenic pollutant, monitoring concentration of p-ASA is significant to maintain environmental security. Photoelectrochemical (PEC) detection is promisingly applied in environmental monitoring for its lower cost and simpler operation, compared to traditional techniques. However, general electrode materials of PEC sensors need to be modified with biological probes due to lack of specific binding sites to analytes, which may lead to complicated sensor fabrication and bio-recognizers inactivation during storage. Herein, a porphyrinic metal–organic framework/reduced graphene oxide (PCN-224/rGO) nanocomposite with simultaneously excellent photoelectric activity and strong binding characteristics was prepared and used to fabricate a PEC sensor for p-ASA detection avoiding the modification of bio-recognizers. Benefiting from the high conductivity of rGO, the separation efficiency of charge carriers was improved in PCN-224/rGO and thereby photocurrent gained an amplification of about 12 times. The PCN-224/rGO nanocomposite had strong affinity to p-ASA via Zr–O–As coordination and π–π stacking. Significantly, the binding of p-ASA could adjust the band position of PCN-224/rGO and facilitate oxygen reduction by releasing more photogenerated electrons, achieving photocurrent enhancement. The developed PEC sensor had a wide detection range, from 10 ng L−1 to 10 mg L−1, with a detection limit of 5.47 ng L−1. Furthermore, the sensor was successfully applied to monitor p-ASA in simulated natural water and swine manure lixivium. This study paved the way for the design of more efficient PEC sensors for environmental monitoring.
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BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Lingpu Jia,Yaxin Zhou,Kaipeng Wu,Qingling Feng,Chunming Wang,Ping He
A flexible acetylcholinesterase (AChE) film biosensor, based on a AuNPs-MoS 2 -reduced graphene oxide/polyimide flexible film (rGO/PI) electrode, has been synthesized for paraoxon detection. In this study, the rGO/PI film acts as the flexible substrate and AuNPs are reduced by monolayer MoS 2 under illumination. Transmission electron microscopy revealed that AuNPs are uniformly dispersed on the MoS 2 -rGO/PI electrode surface with a diameter ~10 nm. X-ray photoelectron spectroscopy indicated that a strong binding force exists between reduced AuNPs and monolayer MoS 2 . The AChE modified AuNPs-MoS 2 -rGO/PI flexible film biosensor is used to hydrolyze acetylcholine chloride and obtain a large current response at 0.49 V by differential pulse voltammetry , demonstrating successful immobilization of AChE. In view of the inhibition of paraoxon on the AChE, under optimal conditions, the AChE/AuNPs-MoS 2 -rGO/PI film biosensor shows a linear response over a concentration range 0.005–0.150 μg/mL, a sensitivity of 4.44 uA/μg/ mL, a detection limit of 0.0014 μg/mL, acceptable reproducibility and stability to paraoxon. The flexible film biosensor has also proved used for detection of paraoxon in real samples.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Xiao Zhou,Shaoqi Zhou,Fuzhen Ma,Yanbin Xu
Graphene oxide was prepared using the modified Hummers method and reduced graphene oxide (rGO) - titanium dioxide (TiO 2 ) nanocomposite was synthesised using the one-step hydrothermal treatment . The synergistic effects on adsorption and photocatalytic properties of the rGO-TiO 2 nanocomposite for the humic acid removal were systematically investigated. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman and infrared (IR) spectroscopy indicate that GO was partially reduced to reduced graphene oxide (rGO) in the hydrothermal synthesis process and anatase TiO 2 nanoparticles uniformly grew on the surface of rGO. The photoelectron and photohole generated under visible light irradiation were effectively separated on the surface of rGO-TiO 2 . The rGO-TiO 2 nanocomposite exhibited higher photocatalytic activity as a result of the synergistic effects of surface functional groups for adsorption and the excellent conductivity for photocatalytic reaction. The effect of rGO-TiO 2 nanocomposite dosage, light intensity and system temperature on the removal of humic acid solution was investigated. The results show that the removal efficiency of humic acid increased with system temperature and light intensity. When the dosage of rGO-TiO 2 nanocomposite was 1.2 g/L, the temperature, the light intensity and the pH of this system was 303 K, 4.37 Wm −2 and 7, respectively, the removal efficiency of humic acid reached 88.7% under visible light irradiation.
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RSC Advances
·
2019
·Vol. 9
·期 8
·4180-4189
·
IF 3.049
Yuzhou Li,Yufan Zhang,Haoran Zhang,Tie-ling Xing,Guo-qiang Chen
In recent years, the energy supply problem of wearable electronic equipment has become a topic of increasing concern. It is necessary to develop energy storage equipment with environmental protection, flexibility, a light quality and excellent performance. In this work, a solid, flexible and symmetrical supercapacitor based on graphene coated cotton fabric was fabricated. The flexible electrode materials were prepared through an environmentally friendly “dry-coating” method and subsequent “two step reduction” method of chemical and microwave reduction, the method is simple and convenient. The morphology and structure of prepared flexible electrode materials were characterized by scanning electron microscopy, X-ray diffraction, and Raman spectrometry. The supercapacitor was assembled in a sandwich structure and packaged and its electrochemical performance was investigated. The flexible sandwich structure (FSS) supercapacitor exhibits high capacitance (464 F g−1 at 0.25 A g−1), good cycling stability (91.6% capacitance retention after 1000 charge and discharge cycles) and excellent electrochemical stability. This supercapacitor with easy fabrication, flexible and excellent electrochemical performance has potential to be used as a wearable device.
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JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Bangrun Wang,Jun Jin,Kun Rui,Chenxi Zhu,Zhaoyin Wen
The hierarchical porous germanium/reduced graphene oxide (Ge/rGO) microspheres are synthesized through an industrially scalable spray drying technique using commercial germanium dioxide (GeO 2 ) as raw material. The Ge/rGO microspheres architecture with Ge nanoparticles homogeneously embedded in the three-dimensional (3D) interconnected conductive rGO network. When employed as anode for lithium ion batteries (LIBs), the as-obtained Ge/rGO microspheres exhibit excellent electrochemical performance with a high reversible capacity (811 mAh g −1 after 1000 cycles), ultra-long cycling life (over 80% capacity retention from the 6th to 1000 th cycles at 1 C), and high rate capability (380 mAh g −1 at 20 C). In addition, the full cell consisting of Ge/rGO-2 anode and LiFePO 4 cathode also delivers good cycling stability with high energy density . The 3D conductive rGO network provides the pathway for electron transportation and promotes to form stable solid electrolyte interphase (SEI) layer. Furthermore, the void space deduced from the porous structure can effectively accommodate volume changes and enhance the structural integrity of Ge/rGO microspheres. This facile and scalable synthetic strategy is beneficial for large-scale production of Ge-based electrode materials for further application in high energy and power density LIBs.
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