Hexagonal boron-nitride material, preparation method and application of hexagonal boron-nitride material

A technology of hexagonal boron nitride and boron nitride, which is applied in the field of hexagonal porous boron nitride material and its preparation, can solve the problem of uneven structure of boron nitride pore, uncontrollable morphology of boron nitride, controllable adjustment of precursor, etc. problem, to achieve the effect of improving the adsorption effect, improving the adsorption, and increasing the specific surface area

Active Publication Date: 2017-11-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this scheme is that the shape of the precursor is not controllable during the preparation of the precursor, and the shape of the obtained boron nitride is uncontrollable, only fibrous; and it uses a one-step direct heating The calcination method

Method used

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  • Hexagonal boron-nitride material, preparation method and application of hexagonal boron-nitride material

Examples

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Embodiment 1

[0088] This embodiment provides a method for preparing the hexagonal boron nitride material provided by the application, and the specific method is as follows:

[0089] (1) Dissolve 15.3g of boric acid and melamine in 250ml of water at a molar ratio of 4:1, adjust the pH of the solution to 10 with sodium hydroxide, heat to 90°C and fully stir for 4h, then cool and crystallize at 25°C for 12h Filtrate, wash the separated solid, and dry in a drying oven at 60°C to obtain precursor C 3 N 6 h 6 · 2H 3 BO 3 ;

[0090] (2) Under pure ammonia atmosphere, the precursor C obtained in step (1) 3 N 6 h 6 2H 3 BO 3 First heat up to 600°C for 2 hours at a rate of 3°C / min, then heat up to 700°C for 3 hours at a rate of 4°C / min, and obtain the hexagonal boron nitride material after reduction and nitriding.

[0091] figure 1 It is the X-ray diffraction (XRD) pattern of the precursor prepared by step (1) of the present embodiment, precursor C 3 N 6 h 6 2H 3 BO 3 It is not a sim...

Embodiment 2

[0098] This embodiment provides a method for preparing the hexagonal boron nitride material provided by the application, and the specific method is as follows:

[0099] (1) Dissolve 6.3 g of boric acid and melamine in 250 ml of water at a molar ratio of 2:1, adjust the pH of the solution to 5 with hydrochloric acid, and take the total mass of boric acid, melamine and optional surfactants as 100%, add 15wt% surfactant DTAC, heated to 90°C and fully stirred for 5h until the solution became transparent, cooled and crystallized at 25°C for 20h, filtered, washed the separated solid, and dried in a drying oven at 60°C to obtain precursor C 3 N 6 h 6 2H 3 BO 3 ;

[0100] (2) Under the atmosphere of pure ammonia and nitrogen 1:1, the precursor C obtained in step (1) 3 N 6 h 6 · 2H 3 BO 3 First heat up to 600°C for 3 hours at a rate of 3°C / min, then heat up to 800°C for 3 hours at a rate of 3°C / min, and obtain the hexagonal boron nitride material after reduction and nitriding....

Embodiment 3

[0104] This embodiment provides a method for preparing the hexagonal boron nitride material provided by the application, and the specific method is as follows:

[0105] (1) Dissolve 12.6g of boric acid and melamine in 2:1 molar ratio in total in 500ml of water, adjust the pH of the solution to 8 with sodium hydroxide, heat to 88°C and fully stir for 6h, cool and crystallize at 25°C for 18h Filtrate, wash the separated solid, and dry in a drying oven at 80°C to obtain precursor C 3 N 6 h 6 · 2H 3 BO 3 ;

[0106] (2) Under the atmosphere of pure ammonia and nitrogen 2:1, the precursor C obtained in step (1) 3 N 6 h 6 · 2H 3 BO 3 First heat up to 500°C for 2 hours at a rate of 5°C / min, then heat up to 1000°C for 3 hours at a rate of 4°C / min, and obtain the hexagonal boron nitride material after reduction and nitriding.

[0107] Figure 7 It is the SEM photo of the hexagonal boron nitride material prepared in this example. It can be seen that the hexagonal boron nitride...

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Abstract

The invention provides a hexagonal boron-nitride material, a preparation method and application of hexagonal boron-nitride material. The hexagonal boron-nitride material is of an assembling structure consisting of porous boron-nitride whiskers and porous boron-nitride piece layers, or a porous boron-nitride whisker structure distributed with mesopores and macropores and with the specific surface area reaching 420m<2>/g. The preparation method comprises the following steps: (1) adding boric acid, melamine and optional surface active agent into water, mixing, heating, adjusting pH value of solution to be 3-11, crystallizing, and separating solid and liquid to obtain precursor; and (2) carrying out two-section type calcining reduction on the precursor in the step (1) under the atmosphere of ammonia gas or the mixed atmosphere containing the ammonia gas to obtain the hexagonal boron-nitride material. The hexagonal boron-nitride material can be used as an absorbing agent for absorbing metal ions and/or organic matters. The invention also provides a cyclic regeneration method of the hexagonal boron-nitride material. The hexagonal boron-nitride material is an excellent absorbing agent, is excellent in absorbing performance and cyclic regeneration performance, and has good application prospect in the field of water treatment.

Description

technical field [0001] The invention belongs to the fields of preparation of applied materials and environmental protection, and relates to a hexagonal boron nitride material and its preparation method and application, in particular to a hexagonal porous boron nitride material composed of sheets and whiskers or composed of whisker structures. Boron material and its preparation method and use. Background technique [0002] Wastewater containing heavy metals, oils and organic matter produced by human production and living activities is discharged into the natural environment without treatment or treatment up to standard for some reasons. The resulting water pollution has already caused serious damage to the ecological environment, public health and social economy sustainable development poses a serious threat. Various treatment technologies and methods for effectively removing heavy metals and organic matter in water have attracted great attention from governments and researc...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/28B01J20/30B01J20/34C02F1/28C02F101/30
CPCB01J20/0248B01J20/28059B01J20/28061B01J20/28083B01J20/28085B01J20/3433B01J20/3483C02F1/281C02F2101/30
Inventor 张红玲张晶庆朋辉唐海燕徐红彬曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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