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Method for preparing black phosphorus nano-sheets through low-temperature mediation

A technology of nanosheets and black phosphorus, which is applied in the field of environmental pollutant removal, can solve the problems of low cost and low yield, and achieve the effect of large specific surface area, high efficiency and low cost preparation, and simple low temperature treatment process by adding liquid nitrogen

Active Publication Date: 2020-01-10
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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Problems solved by technology

[0004]The liquid phase exfoliation method is a widely used method to prepare ultrathin two-dimensional nanosheets from layered bulk crystal materials. Low cost, efficient and large-scale preparation of ultra-thin two-dimensional black phosphorus nanomaterials in solution, but the low yield is a problem that cannot be ignored

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  • Method for preparing black phosphorus nano-sheets through low-temperature mediation
  • Method for preparing black phosphorus nano-sheets through low-temperature mediation
  • Method for preparing black phosphorus nano-sheets through low-temperature mediation

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Embodiment 1

[0020] Such as figure 1 The preparation method of the shown two-dimensional black phosphorus nanosheets

[0021] 1) Grind blocky black phosphorus into powder in a mortar, immerse black phosphorus powder in liquid nitrogen for 3 hours (temperature is -196°C), then weigh 50 mg of black phosphorus powder treated with liquid nitrogen in 40 mL of brown Then add 30mL of anaerobic water to the brown bottle to form a black phosphorus powder dispersion.

[0022] 2) The obtained black phosphorus powder dispersion is passed through an ice pack water bath, and the probe is ultrasonicated for 6 hours, and the temperature is controlled below 10°C. After ultrasonication, the supernatant was obtained by centrifugation (rotating speed was 1000rpm, and centrifugation time was 20min), that is, the target suspension containing two-dimensional black phosphorus nanosheets was obtained, and the concentration was 235.8±12.2mg / L (see figure 2 ).

[0023] The anaerobic water needs to be dissolved i...

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Abstract

The invention relates to an environmental pollutant removal technology, particularly to a method for preparing black phosphorus nano-sheets through low-temperature mediation. The method comprises: soaking grinded black phosphorus powder in excessive liquid nitrogen (with a temperature of -196 DEG C), carrying out low-temperature freezing treatment for 0.5-6 h, dispersing the treated black phosphorus powder in oxygen-free water, performing water bath ultrasonic treatment after dispersion, performing centrifugal separation, and collecting the supernatant, ie., the suspension containing the two-dimensional black phosphorus nano-sheets. According to the method of the invention, by combining the liquid nitrogen low-temperature mediated pretreatment and the liquid probe ultrasonic method, the supernatant is collected in a centrifugal separation mode, so that the two-dimensional black phosphorus nano-sheets can be prepared efficiently at low cost, and the environmental pollutant removal effect is remarkable.

Description

technical field [0001] The invention relates to a technology for removing environmental pollutants, in particular to a method for preparing black phosphorus nanosheets mediated by low temperature. Background technique [0002] Since black phosphorus was successfully stripped in 2014, it has attracted worldwide attention. Two-dimensional black phosphorus has many excellent properties, such as high carrier mobility and on-off ratio, photo / electrical anisotropy, photothermal effect, photodynamic effect, excellent biocompatibility, and large specific These characteristics make two-dimensional black phosphorus show great potential application value in field effect transistors, thermoelectric materials, optical monitoring devices, sensors and biomedicine. [0003] The development of facile, efficient, and practical methods for preparing 2D black phosphorus nanosheets is crucial for studying their properties and applications. At present, the existing two-dimensional black phospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/02B82Y30/00B82Y40/00
CPCC01B25/02B82Y30/00B82Y40/00
Inventor 赵青马微张雪娇张思玉李登宇吴丰昌
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI