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Carbon nitride/tungsten oxide composite hollow microsphere and preparation method thereof

A technology of hollow microspheres and carbon nitride, applied in nitrogen compounds, chemical instruments and methods, nitrogen and non-metallic compounds, etc., can solve the complex preparation process of tungsten oxide spheres, small specific surface area of ​​composite materials, and weak visible light response ability and other problems, to achieve the effect of improving absorption and utilization capacity, improving photoelectric performance, and good uniformity

Active Publication Date: 2016-08-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of the tungsten oxide ball is complex and requires a special spray drying device
Patent CN102266783A discloses an iron-doped tungsten trioxide photocatalyst and its preparation method, which uses tungsten-containing and iron-containing compounds as precursors, and through the processes of mixing the two, grinding, and high-temperature calcination, the raw materials are finally converted into WO 3 Iron-doped tungsten trioxide can be prepared in the form of iron oxide and iron oxide, but the specific surface area of ​​the composite material is small, the morphology has no outstanding features, and the visible light response ability is not strong.

Method used

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  • Carbon nitride/tungsten oxide composite hollow microsphere and preparation method thereof
  • Carbon nitride/tungsten oxide composite hollow microsphere and preparation method thereof
  • Carbon nitride/tungsten oxide composite hollow microsphere and preparation method thereof

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Effect test

Embodiment 1

[0026] 0.330 g (1.0 mmol) of Na 2 WO 4 ·2H 2 O, 4.504g (25mmol) glucose and 0.336g (8mmol) cyanamide were dissolved in 50ml deionized water, sonicated and stirred for 30min to form a homogeneous solution. The above-mentioned mixed solution was transferred to a stainless steel hydrothermal kettle, heated to 200°C at 2°C / min in a muffle furnace, and kept for 20 hours. After natural cooling, centrifugation, repeated washing with distilled water and absolute ethanol for 3 times, and vacuum drying at 60 °C to obtain WO 3 -CN composite carbon ball. The obtained composite carbon spheres were heated to 500 ℃ at 2 ℃ / min in a tube furnace, calcined for 2 hours, and cooled naturally to finally obtain carbon nitride / tungsten oxide composite hollow microspheres.

Embodiment 2

[0028] 0.330 g (1.0 mmol) of Na 2 WO 4 ·2H 2 O, 4.504g (25mmol) glucose and 0.252g (2mmol) melamine were dissolved in 50ml deionized water, ultrasonicated and stirred for 30min to form a homogeneous solution. The above-mentioned mixed solution was transferred to a stainless steel hydrothermal kettle, heated to 200°C at 2°C / min in a muffle furnace, and kept for 20 hours. After natural cooling, centrifugation, repeated washing with distilled water and absolute ethanol for 5 times, and vacuum drying at 60 °C to obtain WO 3 -CN composite carbon ball. The obtained composite carbon spheres were heated to 500 °C at 5 °C / min in a tube furnace, calcined for 2 hours, and naturally cooled to finally obtain carbon nitride / tungsten oxide composite hollow microspheres.

Embodiment 3

[0030] 0.330 g (1.0 mmol) of Na 2 WO 4 ·2H 2 O, 4.504g (25mmol) glucose and 0.481g (8mmol) urea were dissolved in 50ml deionized water, ultrasonicated and stirred for 30min to form a homogeneous solution. The above mixed solution was transferred to a stainless steel hydrothermal kettle, heated to 200°C at 2°C / min in a muffle furnace, and kept for 24 hours. After natural cooling, centrifugation, repeated washing with distilled water and absolute ethanol for 4 times, and vacuum drying at 60 °C to obtain WO 3 -CN composite carbon ball. The obtained composite carbon spheres were heated to 550 °C at 5 °C / min in a tube furnace, calcined for 5 hours, and naturally cooled to finally obtain carbon nitride / tungsten oxide composite hollow microspheres.

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Abstract

The invention discloses a carbon nitride / tungsten oxide composite hollow microsphere and a preparation method thereof. The microsphere is a hollow spherical shell layer jointly formed by carbon nitride and tungsten oxide. The microsphere is prepared by adopting tungstate and a carbon nitride precursor as raw materials and glucose sintered carbon spheres as structural templates and adopting a hydrothermal method and high-temperature calcination. The carbon nitride / tungsten oxide composite hollow microsphere has the beneficial effects that the microsphere has a hollow inner cavity; the shell is simultaneously formed by carbon nitride and tungsten oxide uniformly in a certain proportion, thus showing good uniformity; the hollow microsphere has larger specific surface area; the hollow inner cavity can provide more electromagnetic wave reflection paths, thus improving the external radiation energy absorption and utilization capabilities of the material.

Description

technical field [0001] The invention belongs to the technical field of semiconductor composite materials, in particular to a carbon nitride / tungsten oxide composite hollow microsphere and a preparation method thereof. Background technique [0002] Tungsten oxide inorganic semiconductor materials have received extensive attention due to their unique physical and chemical properties. At present, tungsten oxide semiconductors have been applied in the fields of photocatalysis, photochromism, gas sensing, electrochromism, and field emission. Researchers can prepare a variety of tungsten oxide micro-nano materials with different sizes and morphologies through various methods, such as nanosheets, nanorods and hollow spheres. Among them, hollow spherical tungsten oxide has attracted much attention because of its unique morphology. It has the advantages of high specific surface area, excellent load-bearing capacity and low density, which makes tungsten oxide have a wider application...

Claims

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Application Information

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IPC IPC(8): C01G41/02C01B21/082
CPCC01B21/0605C01G41/02C01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2004/34C01P2004/61
Inventor 杨勇肖婷婷张肖阳
Owner NANJING UNIV OF SCI & TECH
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