Environmental Science-Nano
·
2019
·Vol. 6
·期 12
·3670-3683
·
IF 7.704
Hui Li,Fang Deng,Yang Zheng,Li Hua,Chunhua Qu,Xubiao Luo
Fabrication of Z-scheme heterojunctions and crystal facet engineering are effective strategies for enhancing visible-light photocatalytic redox ability. Visible-light-responsive Z-scheme reduced graphene oxide (rGO)/Bi2S3–BiOBr heterojunctions with a tunable exposed BiOBr (102) facet and high stability were prepared by a one-pot solvothermal strategy. A graphene oxide (GO) solution acts as a rGO precursor and crystal facet controlling agent of BiOBr (102). The optimized 1% rGO/Bi2S3–BiOBr catalyst shows a much higher photocatalytic activity in degrading a single-component 2-nitrophenol (2NP) solution and a reducing single-component Cr(VI) solution than Bi2S3, BiOBr and Bi2S3–BiOBr. In the mixture solution of 2NP and Cr(VI), 2NP degradation and Cr(VI) reduction occur simultaneously, and the Cr(VI) reduction efficiency and 2NP degradation efficiency reached 95% and 67%, respectively. The synergism of rGO/Bi2S3–BiOBr for simultaneous 2NP degradation and Cr(VI) reduction can be attributed to the efficient production of electrons and reactive oxygen species. This work sheds light on the design of facet-dependent Z-scheme photocatalysts to advance photocatalytic redox capability.
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Nano Research
·
2023
·
IF 9.9
Chen Tanlin,Tian Yingrui,Guo Zihao,Chen Yao,Qi Qing,Meng Fanbin
In order to meet the requirements of the marine environment for microwave absorption (MA) materials, we put forward the strategy of constructing multi-functional composite materials, which integrate microwave absorption, anti-corrosion, and antibacterial properties. Herein, graphene oxide (GO) was used as a template to induce the growth of zeolitic imidazolate framework-8 (ZIF-8), simultaneously as a two-dimensional (2D) nanocontainers to load corrosion inhibitors to achieve pH-responsive and self-healing properties. Finally, quaternary ammonium salt (dimethyl octadecyl(3-trimethoxylsilyl propyl) ammonium chloride (DMAOP)) and sodium ascorbate (VCNa) were introduced to achieve synergistic antibacterial activity and the reduction of GO. The 2D strip-like structure of ZIF-8 was due to the confined growth induced by the electrostatic attraction between ZIF-8 and GO sheets. The as-obtained reduced GO (RGO)/ZIF-8/DMAOP 5 exhibited excellent microwave absorption (MA) properties, with a minimum reflection loss (RL) value of −47.08 dB at 12.73 GHz when the thickness was 2.8 mm. Moreover, the effective absorption bandwidth reached 6.84 GHz. After soaking in 3.5% NaCl solution for 35 days, the RGO/ZIF-8/DMAOP 5 −0.7% coating still achieved an impedance value of 4.585 × 10 7 Ω·cm 2 and a protective efficiency of 99.994%, providing superior anti-corrosion properties. In addition, fantastic antibacterial activity was obtained, with the antibacterial rates of RGO/ZIF-8/DMAOP 10 reaching 99.39% and 100% against Escherichia coli and Staphylococcus aureus . This work could open new avenues towards the development of a new generation of multifunctional MA materials.
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Analytical Methods
·
2023
·Vol. 15
·期 36
·4758-4766
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IF 3.1
Qiang Wang,Yulin Nie,Zhibin Wu,Yuan Yang
We developed an approach of magnetic dispersive solid-phase extraction (MSPE) based on magnetic graphene nanocomposite rGO/Fe3O4 for the determination of trace Sb(III) and Sb(V) using inductively coupled plasma mass spectrometry (ICP-MS). Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) were used to characterize the sorbent. The adsorption behavior of Sb(III) and Sb(V) on rGO/Fe3O4 was investigated. The results showed that the adsorption capacity of Sb(V) was nearly zero at pH = 9, while Sb(III) could be well adsorbed on rGO/Fe3O4. The magnetic SPE parameters including pH, adsorbent dosage, eluent type, and volume were optimized. The detection limit of Sb(III) under ideal conditions was 6 ng L−1, and the relative standard deviation was 7.6% (c = 1 g L−1, n = 7). The technique was used to identify Sb(III) at trace levels in environmental water samples, and its validity was examined by recovery experiments and the examination of an approved reference material.
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PubMed
高影响因子
TALANTA
·
2023
·
IF 6.1
Fatemeh Maleki,Mohammad-Reza Rashidi,Habib Razmi,Marjan Ghorbani
A novel electrochemical immunosensor was developed for ultrasensitive determination of the hormone insulin-like growth factor 1 (IGF-1) based on immobilization of a specific monoclonal antibody on the electrospun nanofibers of Polyacrylonitrile (PAN)/Zein-reduced graphene oxide (rGO) nanoparticle . The nanofibers deposited on glassy carbon electrode (GCE) showed good electrochemical behaviors with synergistic effects between PAN, Zein, and rGO. PAN/Zein nanofibers were used due to flexibility, high porosity, good mechanical strength, high specific surface area, and flexible structures, while rGO nanoparticles were used to improve the detection sensitivity and anti-IGF-1 immobilizing. Different characterization techniques were applied consisting of FE-SEM, FT-IR, and EDS for the investigation of morphological features and nanofiber size. The redox reactions of [Fe(CN) 6 ] 4−/3− on the modified electrode surface were probed for studying the immobilization and determination processes, using differential pulse voltammetry (DPV) and cyclic voltammetry (CV). Under optimal conditions, LOD (limit of detection) and LOQ (limit of quantification) were obtained as 55.72 fg/mL and 185.73 fg/mL respectively, and sensitivity was acquired 136.29 μA/cm 2 .dec. Moreover, a wide linear range was obtained ranging from 1 pg/mL to 10 ng/mL for IGF-1. Furthermore, the proposed method was applied for the analysis of IGF-1 in several human plasma samples with acceptable results, and it also exhibited high selectivity, stability, and reproducibility.
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高影响因子
MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Jiaodi Li,Linzi Huang,Minghui Huang,Yaqi Yang,Zhifang Liu,Chenxi Wang,Yixi Xie,Pengcheng Zhao,Junjie Fei
Copper (II) ion (Cu 2+ ) is a typical heavy metal ion that not only harms the soil and water environment, but also causes neurological disorders, liver cirrhosis and other diseases. Here, we have successfully synthesized three-dimensional CdS/rGO@Au heterojunction using a simple physical mixing technique, characterized the material synthesis by X-ray diffraction spectroscopy (XRD), Transmission electron microscopy (TEM), and finally used it for selective photoelectrochemical detection of Cu 2+ . In this system, the synergistic interaction of the three creates a channel that is ideal for charge carrier separation and transfer. The cauliflower-shaped CdS possesses a large surface area and acts as a Cu 2+ probe. rGO@Au acts as a sensitizer and amplifies the current change. The photocurrent of the CdS/rGO@Au heterojunction is 7 times higher than that of CdS, indicating that CdS/rGO@Au has a good photoresponse intensity. Under the optimized detection conditions, the proposed photoelectrochemical sensor was able to detect Cu 2+ concentration in the range of 5 nM to 4 μM with a very low limit of detection (LOD) of 2.88 nM. Moreover, the application feasibility of the developed CdS/rGO@Au heterojunction sensor was verified by the detection of Cu 2+ in real water samples.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Zhi-Chao Xiao,Yan Li,Cheng-Lu Liang,Yang Liu,Rui-Ying Bao,Ming-Bo Yang,Wei Yang
For lithium ion batteries (LIBs), a high cell capacity, which requires both a high capacity and a high loading mass of active materials, is crucial for practical application. However, how to fabricate efficient anodes with high cell capacity and high areal capacity remains a challenge. To solve this issue, we design a structure of porous building block composed of multi-functional carbon integrated rGO-Fe 3 O 4 @C composites. The carbon shell of Fe 3 O 4 @C derived from polydopamine (PDA) acts as an artificial solid electrolyte interface (SEI) film to avoid the excessive SEI formation, within which there are sufficient lithium ion diffusion pathways derived from the spaces between Fe 3 O 4 nanocrystals. The carbon derived from the in-situ polymerized polyacrylamide and rGO act as a glue to integrate the as-obtained Fe 3 O 4 @C composites to form the porous building blocks. Due to the compact stacking of building blocks, the composite electrode achieves a high active material loading mass of 5.94 mg (5.25 mg cm −2 ), while maintains a satisfying capacity (685 mAh g −1 after the 100th cycle at 0.5 A g −1 ) and good rate performance (440 mAh g −1 at 3 C). Therefore, a high cell capacity (4.02 mAh) and a high areal capacity (3.6 mAh cm −2 ) at 2.62 mA cm −2 in a single CR2032 coin cell are achieved.
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JOURNAL OF CATALYSIS
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2017
·
IF 6.844
Wen-Hua Dong,Dan-Dan Wu,Jin-Min Luo,Qiu-Ju Xing,Hui Liu,Jian-Ping Zou,Xu-Biao Luo,Xiao-Bo Min,Hui-Long Liu,Sheng-Lian Luo,Chak-Tong Au
For the first time, a novel strategy is developed to couple photocatalytic oxidation with photocatalytic reduction to achieve one-pot conversion of rhodamine (RhB) to methanol and ethanol by using rGO/SrTi 0.95 Fe 0.05 O 3− δ photocatalyst. In the approach, RhB was photocatalytically degraded to CO 2 and water, and then the as-obtained CO 2 was converted into CH 3 OH and C 2 H 5 OH by means of photocatalytic reduction under simulated sunlight irradiation. Photocatalytic experimental results show the 1%rGO/SrTi 0.95 Fe 0.05 O 3− δ has the best photocatalytic activity among the as-prepared catalysts and the corresponding product rate of CH 3 OH and C 2 H 5 OH is 10.76 and 6.14 μmol g −1 h −1 , respectively, with a 1.53% apparent quantum efficiency. Furthermore, a photocatalytic mechanism was proposed to explain the detailed process of one-pot conversion of RhB into hydrocarbons. The present work gives a good example to combine the photodegradation of RhB with photoreduction of CO 2 and proposes a new method to simultaneously tackle the problems of environmental pollution and energy crisis.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-10
·
IF 5.479
Zhao Yanan,Zhou Juan,Jia Zimu,Huo Danqun,Liu Qingyan,Zhong Dengqin,Hu Yu,Yang Mei,Bian Minghong,Hou Changjun
A glassy carbon electrode was modified with a 3D-networked nanostructure composed of MoS 2 , reduced graphene oxide and gold nanoparticles (3D-MoS 2 /rGO/Au). The composites were prepared through in-situ growth of gold nanoparticles on 3D-MoS 2 /rGO nanosheets via a hydrothermal method. The morphology and electrochemical features of the composite were investigated. The 3D-MoS 2 /rGO/Au sensor exhibits excellent electrocatalytic activity for simultaneous detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The oxidation potentials are well separated at around −0.05 V for AA, 0.06 V for DA and 0.2 V for UA, respectively. The detection limits for individual detection and simultaneous detection (S/ N = 3) are 0.93 μM and 1.46 μM for AA, 0.11 μM and 0.15 μM for DA, and 0.74 μM and 0.29 μM for UA. The method was applied to the quantitative analysis of AA, DA, and UA in spiked serum samples with satisfying results.
In-situ growth of gold nanoparticles on 3D-networked MoS 2 /rGO nanocomposite for individual and simultaneous determination of ascorbic acid, dopamine and uric acid.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Baogui Ye,Zhongwei Zhao,Hongmei Liu
Construction of multi-interface contact step-scheme photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photodegradation Estrone and Congo red (CR). In this work, g-C 3 N 4 was selected as the main component, CeO 2 nanosheets with unique Ce 4+ →Ce 3+ conversion property and M-rGO were loaded on the surface of g-C 3 N 4 to construct magnetic photocatalyst, whose structure imparted reusability by magnetic retrieval and at the same time M-rGO acted as an efficient host for g-C 3 N 4 /CeO 2 composite photocatalyst. The photocatalytic performances were investigated with Estrone and CR, and the results showed that the composite photocatalyst g-C 3 N 4 /CeO 2 /M-rGO could degrade 71% of Estrone and 92% of CR. Free radical scavenger test showed that superoxide and hydroxyl radical species played a major role in the degradation. Furthermore, it was demonstrated that the magnetic photocatalyst g-C 3 N 4 /CeO 2 /M-rGO possessed strong antibacterial properties against Proteus mirabilis. A three-factor-three-level Box-Behnken design (BBD) was selected to optimize three greatly influential parameters: light irradiation time (min), the mass of photocatalyst (mg) and pollution concentration (ppm) by responding surface methodology. It was expected that the g-C 3 N 4 /CeO 2 /M-rGO can be used as a magnetic photocatalyst to achieve its valorization, which has very broad development prospects in the field of environmental remediation or catalysis.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19915-19926
·
IF 3.925
Xuhong Jiang,Mengmeng Sun,Zhuoyuan Chen
Clean and sustainable photoelectric technology has been developed rapidly in many fields. One of which is the novel marine corrosion protection technology that directly utilizes the abundant solar energy falling on the ocean to provide photoinduced cathodic protection for metallic structures, and has received increasing attention year by year. Improving the photoelectrochemical conversion and photoelectric cathodic protection performance for metals under sunlight is vital for achieving effective protection. In particular, optimizing the multi-dimensional nanostructured photoanode to accelerate the collection and transfer of photogenerated electrons and to improve the photoelectric and cathodic protection performance is a promising method. Here, an ultrafine branched anatase TiO2 nanolawn (NL) photoanode co-decorated with CdS nanoparticles and reduced graphene oxide quantum dots (rGO QDs) was prepared. Compared with single CdS modified TiO2 NL, the three-phase junction CdS/rGO QDs/TiO2 NL shows further enhanced photoelectrochemical conversion performance under simulated sunlight and visible light irradiation, increased by 66.7% and 83.3% compared to that of CdS/TiO2 NL, respectively. The rGO QDs, which acted as a high-efficiency electron transporter, are uniformly deposited on the TiO2 NL, and further promote the transport efficiency of photogenerated electrons. CdS as a visible-light responder is responsible for broadening the spectral response, and the ultrafine branched TiO2 NL substrate greatly expands the photon capture area and increases the electron collection sites. Finally, the synergy of the above three aspects ensures that the ternary CdS/rGO QDs/TiO2 NL photoanode exhibits further enhanced simulated sunlight-driven and visible light-driven photoelectric conversion efficiency and a photoinduced cathodic protection effect on 316L stainless steel and pure copper.
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Analytical Methods
·
2019
·Vol. 11
·期 11
·1475-1482
·
IF 2.378
Xiaoyan Mo,Zunyi Wu,Jianfeng Huang,Guangying Zhao,Wenchao Dou
A sensitive and quantitative sandwich electrochemical immunosensor was constructed for the detection of Escherichia coli O157:H7 (E. coli O157:H7) using immune gold@platinum nanoparticles (Au@Pt), neutral red (NR), reduced graphene oxide nanocomposite (rGO) and regenerative leucoemeraldine base polyaniline (PANI)/gold nanoparticles (AuNPs) modified screen-printed carbon electrode (SPCE). The batch production advantages of the SPCE were retained, its disposable characteristic was replaced by the possibility for reuse. The anti-E. coli O157:H7 monoclonal antibody (Ab1) was automatically adsorbed on the SPCE-PANI-AuNPs platform through the amino and AuNPs interaction. rGO-NR-Au@Pt as the non-enzyme signal label can enhance the performance of the immunoassay for the catalytic reduction of H2O2 and amplify the current signal. All characterization steps were monitored by cyclic voltammetry (CV). Based on electrochemical detection of E. coli O157:H7, the linear range was from 8.9 × 103 to 8.9 × 109 CFU mL−1, and limit of detection (LOD) was 2.84 × 103 CFU mL−1. To ensure that the immunosensor can be used repeatedly, ultrasound sonication was used to remove as many surface-bound antibodies as possible. This allows Ab1 to bind to the SPCE-PANI-AuNPs again after the electrode was re-incubated with the antibody solution, and hence, the displacement assay can be repeated and the sensor reused. Furthermore, it was demonstrated that the microchips can be regenerated and reused at least 5 times.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Shaoming Fang,Xiaodong Dong,Shunli Liu,Donglai Penng,Linghao He,Minghua Wang,Guodong Fu,Xiaozhong Feng,Zhihong Zhang
In this paper, we report a novel label-free electrochemical aptasensor for detecting proteins in whole blood based on a three-component nanocomposite , in which ferriferrous oxide and three-dimensional graphene nanocomposite were modified with the plasma-polymerized 4-vinyl pyridine (Fe 3 O 4 @3D-rGO@PP4VP). In this novel sensing strategy, large amounts of amino groups in PP4VP facilitated the immobilization of aptamer strands via the strong electrostatic interaction between positively charged ammonium groups of the nanocomposites and negatively charged phosphate groups of aptamers. In the presence of thrombin, LYS (LYS), and platelet-derived growth factor-BB (PDGF-BB), the adsorbed aptamer strands on the developed nanocomposite surface caught the targeted proteins at the electrode interface. The aptamer preferred to be a barrier for electrons and inhibited electron transfer, leading to the decreased peak current of cyclic voltammetry measurements and the increased electron transfer resistance of electrochemical impedance spectroscopy . The determination of the thrombin, PDGF-BB, and LYS concentrations with this novel strategy showed low detection limits of 4.5, 29.4, and 14 pg·mL −1 , and the analytical ranges extend from 0.01 to 50, 0.1 to 100, and 0.1 to 200 ng·mL −1 , respectively. The resultant aptasensor exhibited high selectivity, acceptable reproducibility, and stability toward thrombin. The aptasensor could be used to detect thrombin in whole blood samples, thereby suggesting its possible application in clinical settings.
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