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Sewage purifying photolysis water hydrogen generation double-function environment-friendly carbon nitride photocatalyst and preparation method and application thereof

An environmentally friendly technology for hydrogen production by photolysis of water, which is applied in the direction of light water/sewage treatment, hydrogen production, etc. simple effect

Inactive Publication Date: 2019-05-10
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many shortcomings in these traditional semiconductor photocatalysts: 1. These inorganic semiconductors mainly use ultraviolet light, and there are no photocatalytic materials with high visible light utilization rate and high quantization efficiency
2. Most of these semiconductor materials contain expensive rare metal elements, it is difficult to realize the large-scale application of photocatalytic technology in practical engineering
However, removing the template (SiO 2 ) The etchant (HF) used in the process will not only cause secondary pollution, but also cause damage to the catalyst structure; on the other hand, because the templating agent (surfactant / block copolymer) will introduce Impurity carbon, resulting in carbon enrichment in the catalyst, which will cause a decline in catalyst performance

Method used

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  • Sewage purifying photolysis water hydrogen generation double-function environment-friendly carbon nitride photocatalyst and preparation method and application thereof
  • Sewage purifying photolysis water hydrogen generation double-function environment-friendly carbon nitride photocatalyst and preparation method and application thereof
  • Sewage purifying photolysis water hydrogen generation double-function environment-friendly carbon nitride photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Mixing of precursor and templating agent

[0047] Mix 1g of dicyandiamide and 1g of MgO in a certain ratio of 1:1, then grind and mix evenly.

[0048] (2) The first high-temperature roasting of the mixture

[0049] Transfer the well-mixed mixture to a crucible, put it into a tube furnace, and put it under nitrogen (N 2) conditions, first, pass nitrogen at room temperature for half an hour, remove the air in the tube, then raise the temperature from room temperature to 400 °C at a rate of 5 °C / min, then keep the temperature for 2 hours, then cool down to room temperature naturally, and remove it for use.

[0050] (3) Removal of templating agent

[0051] Grind the mixture after the first high-temperature roasting evenly, then add excess dilute acid solution, stir for 20 hours, and remove the template. Then, it was centrifugally washed with distilled water until the supernatant was neutral, and finally washed with ethanol, put into an oven, and dried at 80°C.

[00...

Embodiment 2

[0057] (1) Mixing of precursor and templating agent

[0058] Mix 1g of dicyandiamide and 2g of MgO in a certain ratio of 1:2, then grind and mix evenly.

[0059] (2) The first high-temperature roasting of the mixture

[0060] Transfer the well-mixed mixture to a crucible, put it into a tube furnace, and put it under nitrogen (N 2 ) conditions, first, pass nitrogen at room temperature for half an hour, remove the air in the tube, then raise the temperature from room temperature to 400 °C at a rate of 5 °C / min, then keep the temperature for 2 hours, then cool down to room temperature naturally, and remove it for use.

[0061] (3) Removal of templating agent

[0062] Grind the mixture after the first high-temperature roasting evenly, then add excess dilute acid solution, stir overnight, and remove the template. Then, it was centrifugally washed with distilled water until the supernatant was neutral, and finally washed with ethanol, put into an oven, and dried at 80°C.

[0063...

Embodiment 3

[0068] (1) Mixing of precursor and templating agent

[0069] Mix 1g of dicyandiamide and 4g of MgO in a certain ratio of 1:4, then grind and mix evenly.

[0070] (2) The first high-temperature roasting of the mixture

[0071] Transfer the well-mixed mixture to a crucible, put it into a tube furnace, and put it under nitrogen (N 2 ) conditions, first, pass nitrogen at room temperature for half an hour, remove the air in the tube, then raise the temperature from room temperature to 400 °C at a rate of 5 °C / min, then keep the temperature for 2 hours, then cool down to room temperature naturally, and remove it for use.

[0072] (3) Removal of templating agent

[0073] Grind the mixture after the first high-temperature roasting evenly, then add excess dilute acid solution, stir overnight, and remove the template. Then, it was centrifugally washed with distilled water until the supernatant was neutral, and finally washed with ethanol, put into an oven, and dried at 80°C.

[0074...

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Abstract

The invention relates to a sewage purifying photolysis water hydrogen generation double-function environment-friendly carbon nitride photocatalyst and a preparation method and application thereof. Thecatalyst is prepared by taking a cyanamide compound or a nitrogen-enriched carbon-containing substance as a precursor and micro / nano inorganic salt as a template agent. The preparation method includes: physically mixing the precursor with the template agent different in proportion, and performing high-temperature calcining, template moving, washing and calcining to obtain a porous-structure catalyst. The catalyst is environment-friendly, low in cost, high in chemical and thermal stability and high in pollutant extruding efficiency.

Description

technical field [0001] The invention relates to a dual-functional friendly carbon nitride photocatalyst for sewage purification / photolysis of water to produce hydrogen and its preparation method and application, which belongs to the fields of green environmental protection catalytic materials, sewage treatment and renewable clean energy, and is especially suitable for domestic and industrial sewage Purified and all-solid-state visible light-responsive device energy source. Background technique [0002] Energy is the material basis for human survival and an important material guarantee for sustainable social and economic development. In recent years, with the rapid development of the world economy and the rapid development of modern industrialization, people's demand for energy is increasing day by day. In order to meet the ever-increasing demand for energy, a large amount of non-renewable fossil energy such as coal, oil, and natural gas has been consumed, causing serious en...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04C02F1/30
Inventor 王建海徐鑫沈岳松古飒飒
Owner NANJING UNIV OF TECH
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