Preparation method of acid-modified silicate mineral-loaded graphite-phase carbon nitride photocatalyst

A technology based on silicate minerals and phase carbon nitride, which is applied in the field of photocatalytic materials and can solve the problems of high cost, long preparation period and complicated process

Pending Publication Date: 2021-04-20
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently preparing g-C with large specific surface area 3 N 4 Usually soft / hard template method, strong acid etching method, or ultrasonic stripping method are used, although the obtained large specific surface area g-C 3 N 4 It has good photocatalytic performance, but it needs to use a large amount of strong acid or strong base, long-term hydrothermal or ultrasonic treatment in the synthesis process, the process is complicated, the cost is expensive, the preparation cycle is long, and it cannot be produced on a large scale

Method used

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  • Preparation method of acid-modified silicate mineral-loaded graphite-phase carbon nitride photocatalyst
  • Preparation method of acid-modified silicate mineral-loaded graphite-phase carbon nitride photocatalyst
  • Preparation method of acid-modified silicate mineral-loaded graphite-phase carbon nitride photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Prepare 150mL of aqueous solution of 1M hydrochloric acid and 5mL of aqueous solution of 1M sodium hydroxide, stir and disperse evenly;

[0031] (2) Weigh 15 g of sepiolite powder, add 150 mL of hydrochloric acid obtained in step (1) into the sepiolite powder, stir at room temperature for 48 h, and then centrifuge to remove the supernatant. Then add deionized water to the sepiolite powder and stir for 30min to make it evenly dispersed, remove the supernatant after centrifugation, and repeat washing with deionized water for 4 times; after adding deionized water for the 5th time, use step (1) Sodium hydroxide solution adjusted the pH to about 7, centrifuged to remove the supernatant, added deionized water and repeated centrifuged for 3 times, dried the precipitate in a blast drying oven at 60°C for 12 hours, and prepared acid-modified sepiolite powder precursor after grinding body;

[0032] (3) 500 mg of the precursor and 1 g of melamine prepared in step (2) were dis...

Embodiment 2

[0035] (1) Prepare 150mL of aqueous solution of 1M hydrochloric acid and 5mL of aqueous solution of 1M sodium hydroxide, stir and disperse evenly;

[0036] (2) Weigh 15 g of talc powder, add 150 mL of hydrochloric acid obtained in step (1) into the talc powder, stir at room temperature for 48 h, and then centrifuge to remove the supernatant. Then add deionized water to the talc powder and stir for 30min to make it evenly dispersed, remove the supernatant after centrifugation, and repeat washing with deionized water for 4 times; after adding deionized water for the 5th time, use the hydrogen Sodium oxide solution adjusted the pH to about 7, centrifuged to remove the supernatant, added deionized water and repeated centrifuged 3 times, dried the precipitate in a blast drying oven at 60°C for 12 hours, and prepared the acid-modified talc powder precursor after grinding;

[0037] (3) 500 mg of the precursor and 1 g of melamine prepared in step (2) were dispersed in 30 ml of absolut...

Embodiment 3

[0039] (1) Prepare 150mL of aqueous solution of 1M hydrochloric acid and 5mL of aqueous solution of 1M sodium hydroxide, stir and disperse evenly;

[0040] (2) Weigh 15 g of kaolin powder, add 150 mL of hydrochloric acid obtained in step (1) into the kaolin powder, stir at room temperature for 48 h, and then centrifuge to remove the supernatant. Then add deionized water to the kaolin powder and stir for 30 minutes to make it evenly dispersed, remove the supernatant after centrifugation, and repeat washing with deionized water for 4 times; after adding deionized water for the 5th time, use the hydroxide Adjust the pH to about 7 with the sodium solution, remove the supernatant by centrifugation, add deionized water and repeat the centrifugation for 3 times, dry the precipitate in a blast drying oven at 60°C for 12 hours, and prepare the acid-modified kaolin powder precursor after grinding;

[0041] (3) 600 mg of the precursor and 1 g of melamine prepared in step (2) were dispers...

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Abstract

The invention discloses a preparation method of an acid modified silicate mineral loaded graphite phase carbon nitride photocatalyst. Different acid modified silicate mineral powder precursors and nitrogen-rich precursors are calcined in a muffle furnace to prepare acid modified silicate mineral loaded graphite phase carbon nitride photocatalyst solid powder, namely AS (acid modified sepiolite) / g-C3N4, AT (acid modified talcum powder) / g-C3N4 and AK (acid modified kaolin) / g-C3N4. the preparation method has the advantages of low cost, low energy consumption, simple synthesis process and large specific surface area of the catalyst. The prepared acid-modified silicate mineral-loaded graphite-phase carbon nitride photocatalyst has relatively strong visible light absorption, shows good stability and relatively high visible light catalytic activity when being applied to photocatalytic decomposition of water to produce hydrogen and reduce carbon dioxide, and has higher scientific significance and application value in the field of new energy development.

Description

technical field [0001] The invention relates to a photocatalytic material, in particular to a method for preparing an acid-modified silicate mineral-loaded graphite-phase carbon nitride photocatalyst. Background technique [0002] Facing the current global energy and environmental problems, there is an urgent need to develop clean and renewable energy. Photocatalytic water splitting and reduction of carbon dioxide is a technology that can efficiently convert solar energy into chemical energy, and has become a research hotspot in the field of new energy. The development of cheap, efficient and stable photocatalytic materials is the key to this technology. [0003] Graphite carbon nitride (g-C 3 N 4 ), as a new type of non-metallic semiconductor photocatalytic material, has a series of advantages such as cheap raw materials, simple synthesis, non-toxic and pollution-free, relatively small band gap and stable optical properties, and has become a popular material in the field...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04C01B32/40
CPCY02E60/36
Inventor 刘冀锴陈云辉罗和安
Owner XIANGTAN UNIV
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