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Magnetic nano-carbon nitride photocatalyst capable of removing algae and preparation method thereof

A magnetic nano-catalyst technology, used in physical/chemical process catalysts, herbicides and algicides, chemical instruments and methods, etc., can solve the problems of low recovery rate, limited scope of application, expensive photocatalysts, etc. The effect of promoting and reducing secondary pollution and improving the activity of photocatalyst

Pending Publication Date: 2021-08-31
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the high cost and low recovery rate of photocatalyst itself, its application scope is limited.

Method used

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  • Magnetic nano-carbon nitride photocatalyst capable of removing algae and preparation method thereof
  • Magnetic nano-carbon nitride photocatalyst capable of removing algae and preparation method thereof
  • Magnetic nano-carbon nitride photocatalyst capable of removing algae and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a magnetic nano-carbon nitride photocatalyst capable of removing algae, the specific steps are as follows:

[0030] Weigh 10.0g of dicyandiamide, grind it evenly, place it in a 50mm crucible, cover the crucible, put it into a box-type atmosphere furnace, heat it to 500°C at a heating rate of 10°C / min, and calcinate at 500°C for 2h , heated to 550°C at a heating rate of 5°C / min, and after calcination at 550°C for 2 hours, the crucible was taken out and cooled to room temperature naturally; after the sample in the crucible was ground evenly, light yellow carbon nitride particles were obtained. During the preparation process of the carbon nitride particles, nitrogen gas is introduced to isolate oxygen.

[0031] 0.3g nanoscale Fe 3 o 4 Put 1.2g of carbon nitride particles into a 50mm crucible, and add 10ml of absolute ethanol to sonicate for 30min. After sonication, put it in a 60℃ oven to dry for 2h, and then grind it evenly. After passing through...

Embodiment 2

[0033]Use the magnetic nano-carbon nitride photocatalyst prepared in Example 1 to carry out the algae inhibition test, and the specific process is as follows:

[0034] The magnetic nano-carbon nitride photocatalyst (0.5g Fe 3 o 4 -Pd / g-C 3 N 4 particles) into a beaker containing 250ml of algae liquid (the initial value of OD680 is 0.3), and a 500W xenon lamp is equipped at a distance of 15cm from the beaker as a light source, and the light intensity is set to 2mW / cm 2 , The xenon lamp is equipped with an ultraviolet filter, and the photocatalytic reaction is carried out for 6 hours under the condition that the magnetic stirrer rotates at a speed of 200r / min. Collect 10ml samples of algae liquid every 1h for the determination of algae cell density and chlorophyll a content.

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Abstract

The invention discloses a magnetic nano-carbon nitride photocatalyst capable of removing algae and a preparation method thereof. The photocatalyst takes graphite-phase carbon nitride as a carrier to load noble metal palladium Pd, so the photocatalytic activity of the photocatalyst is improved. The precious metal palladium Pd improves the separation efficiency of photo-generated charge carriers of the semiconductor photocatalyst by capturing electrons, and the surface plasmon resonance (SPR) effect of palladium atoms can greatly improve the visible light absorption rate of the photocatalyst, accelerate the generation of free radicals and promote the growth of photocatalytic oxidation algae. Meanwhile, nano-Fe3O4 is loaded in the photocatalyst provided by the invention, so the photocatalyst has good magnetism, and recovery is completed through a magnetic attraction effect. Therefore, the development of the photocatalyst has important significance on the removal work of harmful algae.

Description

technical field [0001] The invention belongs to the preparation technology of nanometer catalytic materials, is applied to the field of photocatalytic algae removal, and specifically relates to a magnetic nanometer carbon nitride photocatalyst capable of removing algae and a preparation method thereof. Background technique [0002] With the development of social economy, industrial wastewater, domestic sewage and farmland runoff bring a large amount of nitrogen and phosphorus into the water body for enrichment, resulting in eutrophication of the water body. Under the influence of environmental factors such as suitable temperature, a large number of cyanobacteria in the water body grow, forming a cyanobacteria bloom that is visible to the naked eye, causing adverse effects on the ecological environment of the water body, resulting in huge economic losses, and directly or indirectly affecting human beings. Health has become one of the major environmental problems prevailing al...

Claims

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Application Information

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IPC IPC(8): B01J27/24A01N59/16A01N59/00C02F1/30C02F1/50A01P13/00
CPCB01J27/24A01N59/16A01N59/00C02F1/30C02F1/50C02F1/505C02F2305/10C02F2305/023B01J35/33B01J35/39
Inventor 张杭君卢诗焕丁佳锋
Owner HANGZHOU NORMAL UNIVERSITY
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