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g-C3N4 nanosheet/graphene oxide composite material and preparation method and application thereof

A technology of nano-sheets and composite materials, applied in chemical instruments and methods, analytical materials, nitrogen compounds, etc., can solve the problems of high cost, complicated detection technology operation, time-consuming, etc., and achieve convenient operation, good anti-interference ability, and simple method Effect

Inactive Publication Date: 2020-04-10
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of g-C 3 N 4 Nano flake / graphene oxide composite material and its preparation method, and the material is modified on the electrode as an electrochemical sensor, and then realizes simultaneous rapid, highly sensitive, and highly selective detection of AC and LEV to overcome the existing detection Disadvantages such as complicated technical operation, time-consuming and high cost

Method used

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  • g-C3N4 nanosheet/graphene oxide composite material and preparation method and application thereof

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Embodiment 1

[0034] A preparation method of CNNS / GO nano composite material, comprising the following steps:

[0035] 1) g-C 3 N 4 Preparation of Nanosheets (CNNS):

[0036] g-C 3 N 4 The preparation of nanosheets (CNNS) is divided into two steps. In the first step, Bulk-g-C was first synthesized by pyrolysis 3 N 4 , in short, put 5g of melamine in a corundum crucible and place it in a muffle furnace at 550°C with a heating rate of 2°C min -1 Heating in atmospheric environment for 2h. The resulting product was ground into powder and then further heated at 540 °C for 4 h. In the second step, CNNS was synthesized by ultrasound-assisted method. The yellow powder was dispersed in distilled water, followed by continuous sonication for 16 hours. The initially formed white suspension was then centrifuged at 4500 rpm to remove residual unstripped g-C 3 N 4 CNNS suspensions were obtained and used for further studies.

[0037] 2) Preparation of graphene oxide (GO) dispersion:

[0038] Gra...

Embodiment 2

[0044] One with g-C 3 N 4 The method for simultaneously detecting acetaminophen and levofloxacin by nano flakes / graphene oxide composite material comprises the following steps:

[0045] (1) The bare GCE surface was polished with 0.05 μm alumina particles, and carefully rinsed with ultrapure water and ethanol until a mirror surface was obtained and dried. Pipette 8 μL of CNNS / GO (1 mg / mL) prepared in Example 1 ) composite material was drip-coated on the surface of glassy carbon electrode (GCE), and fully dried under infrared light to obtain CNNS / GO modified electrode (CNNS / GO / GCE). As controls, CNNS / GCE, GO / GCE were prepared using the same method.

[0046] (2) Immerse GCE, CNNS / GCE, GO / GCE and CNNS / GO / GCE in the mixed solution of PBS (pH 5) containing AC (50 μM) and LEV (25 μM) respectively, and record the difference by differential pulse voltammetry. The oxidation peak current corresponding to the electrode. Such as image 3 As shown, there are two obvious oxidation peaks...

Embodiment 3

[0051] The present invention uses the electrode modified by the prepared CNNS / GO composite material to test the AC and LEV in the water sample of Fenhe River.

[0052] In order to evaluate the practicability of this sensor in actual sample analysis, water from the Fen River in Shanxi was selected for analysis to study the AC and LEV levels in the samples. The electrochemical response of DPV was recorded after adding quantitative amounts of AC and LEV to river water in the linear concentration range. First, the sewage sample is filtered through ordinary filter paper to remove suspended particles and other solid impurities. The filtrate is filtered through a 0.22 μm filter membrane and diluted 100 times. Add 0.8+1, 5+3, 28+10mol L -1 Three different concentrations of AC+LEV standard solutions were used for standard recovery determination, such as Figure 6 As shown in the DPV diagram, the sensor can realize the analysis of real samples.

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Abstract

The invention relates to a g-C3N4 nanosheet / graphene oxide composite material and a preparation method and application thereof. According to the composite material, Bulk-g-C3N4 is synthesized througha pyrolysis method, then g-C3N4 nanosheets are synthesized through an ultrasonic-assisted method and finally the g-C3N4 nanosheets are fixed on the surface of graphene oxide through an ultrasonic method to obtain the composite material. The composite material is modified on the surface of a glassy carbon electrode to prepare a novel sensor for simultaneous, rapid and real-time detection of acetaminophen and levofloxacin. Results show that the sensor has a wide linear range, a low detection limit and high sensitivity for detection of two substances. High-sensitivity detection and analysis of acetaminophen and levofloxacin can be realized and high selectivity can be obtained in the complex environment medium. Meanwhile, the composite material has the advantages of being simple in instrumentand equipment, low in analysis cost, rapid, simple, convenient and the like, and a new detection method can be provided for evaluating residual pollution of acetaminophen and levofloxacin in the environment.

Description

technical field [0001] The invention belongs to nanocomposite materials and electrochemical detection, in particular to a carbon nanocomposite material and its preparation method and application. Background technique [0002] Acetaminophen (AC, N-acetyl-para-aminophenol) or paracetamol is an analgesic and antipyretic drug widely used to treat pain, cold, runny nose, nasal congestion and fever. AC is generally considered safe, and there are no significant side effects from consuming AC in prescribed doses. However, overdose of AC can lead to accumulation of toxic metabolites, which may cause blurred vision, dizziness, liver toxicity and nephrotoxicity. Levofloxacin (LEV) is a third-generation fluoroquinolone antibiotic that is effective against Gram-positive and Gram-negative bacteria and can be used to treat bacterial infections of the sinuses, skin, kidneys, prostate, or bladder. LEV and AC are widely used drugs in many countries. Considered as emerging environmental pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082C01B32/198G01N27/30G01N27/48
CPCC01B21/0605C01B21/082C01B32/198G01N27/308G01N27/48C01P2004/80
Inventor 李忠平伊雯雯郭玉晶董川
Owner SHANXI UNIV
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