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A preparation method of iron@bcn ceramics for photocatalytic hydrogen production

A photocatalytic and ceramic technology, applied in the field of preparation of iron@BCN ceramics for photocatalytic hydrogen production, can solve the problems of material inactivity, low hydrogen evolution efficiency, limited hydrogen evolution efficiency, etc., and achieve the effect of low cost and easy processing.

Active Publication Date: 2022-08-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current BCN ceramics have achieved certain results in the desorption of hydrogen from light water, the hydrogen evolution efficiency of BCN ceramics is limited because the hydrogen evolution of BCN ceramics relies on its own adjustable band gap and has not formed a metal@BCN heterojunction structure. There are also high requirements on the wavelength of light. The hydrogen evolution effect is obvious only under the irradiation of ultraviolet light. Under the condition of visible light irradiation, the hydrogen evolution efficiency is very low, and some materials have no activity.

Method used

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  • A preparation method of iron@bcn ceramics for photocatalytic hydrogen production
  • A preparation method of iron@bcn ceramics for photocatalytic hydrogen production
  • A preparation method of iron@bcn ceramics for photocatalytic hydrogen production

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of iron@BCN ceramics with 1:3:1 molar ratio of boric acid, urea and sodium alginate:

[0024] 1. Weigh 3.983g (0.01 mol) of sodium alginate (carbon source) in a beaker, add 30 mL of water, put it into a magnetic stirrer and stir for 12 hours to ensure that sodium alginate is fully dissolved in water, then weigh 0.618 g (0.01 mol) boric acid (boron source) and 1.8 g (0.03 mol) urea (nitrogen source) in a beaker, add 30 mL of water, sonicate for 1 h to fully dissolve it, add it to the sodium alginate solution after dissolving, continue to stir in a magnetic stirrer Stir for 12h to form a homogeneous mixed solution;

[0025] 2. Preparation of ferric chloride solution: prepare iron ion solution, wherein the mass of iron element is 1% of the total mass of boric acid, urea and sodium alginate. Weigh 0.3090g of ferric chloride hexahydrate (containing 0.0640g of iron) in a beaker, add 60mL of water, and sonicate for 30min;

[0026] 3. Add the prepared ferric chlor...

Embodiment 2

[0032] Preparation of iron@BCN ceramics with boric acid, urea and sodium alginate molar ratio of 1:6:1:

[0033]1. Weigh 3.983g (0.01 mol) of sodium alginate (carbon source) in a beaker, add 30 mL of water, put it into a magnetic stirrer and stir for 12 hours to ensure that sodium alginate is fully dissolved in water, then weigh 0.618 g (0.01 mol) boric acid (boron source) and 3.6g (0.06 mol) urea (nitrogen source) in a beaker, add 30 mL of water, sonicate for 1 h to make it fully dissolved, add it to the sodium alginate solution after dissolving, continue to stir in a magnetic stirrer Stir for 12h to form a homogeneous mixed solution.

[0034] 2. Preparation of ferric chloride solution: prepare iron ion solution, wherein the mass of iron element is 1% of the total mass of boric acid, urea and sodium alginate. Weigh 0.3958g of ferric chloride hexahydrate (containing 0.0820g of iron) in a beaker, add 60mL of water, and sonicate for 30min;

[0035] 3. Add the prepared ferric c...

Embodiment 3

[0040] Preparation of iron@BCN ceramics with a molar ratio of boric acid, urea and sodium alginate of 1:9:1:

[0041] 1. Weigh 3.983g (0.01 mol) of sodium alginate (carbon source) in a beaker, add 30 mL of water, put it into a magnetic stirrer and stir for 12 hours to ensure that sodium alginate is fully dissolved in water, then weigh 0.618 g (0.01 mol) boric acid (boron source) and 5.4 g (0.09 mol) urea (nitrogen source) in a beaker, add 30 mL of water, ultrasonicate for 1 h to fully dissolve it, add it to the sodium alginate solution after dissolving, continue to stir in a magnetic stirrer Stir for 12h to form a homogeneous mixed solution.

[0042] 2. Preparation of ferric chloride solution: prepare iron ion solution, wherein the mass of iron element is 1% of the total mass of boric acid, urea and sodium alginate. Weigh 0.4827g of ferric chloride hexahydrate (containing 0.1000g of iron) in a beaker, add 60mL of water, and sonicate for 30min;

[0043] 3. Add the prepared fe...

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Abstract

The present invention is a method of preparing iron @BCN ceramics with photocatalytic hydrogen -produced hydrogen.This method includes the following steps: (1) Add sodium alginate, boric acid, and urea to dissolve in water to obtain a hybrid solution; (2) add iron ion solution to the hybrid solution to obtain the cross -linking solution;The solution is frozen and dry; (4) at the temperature of 1100 to 1200 ° C in the tube furnace, it is cracked by 4 to 5 hours at high temperature and obtained iron @BCN ceramics.The iron @BCN ceramics prepared by the present invention under the condition of ultraviolet light, the efficiency of the original BCN ceramic hydrogen analysis is increased by 1 to 2 times; under the condition of visible light, the efficiency of the original BCN ceramic hydrogen analysis is improved by 2 ~3 times.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic hydrolysis of hydrogen production, and specifically relates to the introduction of iron ions into BCN ceramics by utilizing the principle that sodium alginate and iron ions can undergo cross-linking between ionic bonds to form an iron@BCN metal-semiconductor heterojunction, And BCN ceramics have small pore size, adjustable band gap, high specific surface area, and high crystallinity, so as to improve the ability of photocatalytic hydrogen production. Background technique [0002] Hydrogen production methods mainly include electrolysis of water to produce hydrogen, reaction conversion of fossil fuels to produce hydrogen, high temperature decomposition of compounds to produce hydrogen, separation of hydrogen-rich industrial gas mixtures to produce hydrogen, biological hydrogen production and solar hydrogen production. With the progress of research, a novel hydrogen production method using pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277B01J35/61B01J35/39Y02E60/36
Inventor 安玉民王天一王广宇程业红韩旭
Owner HEBEI UNIV OF TECH
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