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A kind of carbon nitride photocatalytic material and preparation method thereof

A catalytic material, carbon light technology, applied in chemical instruments and methods, physical/chemical process catalysts, water treatment parameter control, etc., can solve problems such as unreported, and achieve reduced recycling and processing capacity, good degradation performance, and economical preparation. and the effect of running costs

Active Publication Date: 2022-07-29
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many studies on the extraction of nitrogen and phosphorus from urine, but there are no reports on the preparation of carbon nitride photocatalytic materials through sludge activation as raw materials.

Method used

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  • A kind of carbon nitride photocatalytic material and preparation method thereof
  • A kind of carbon nitride photocatalytic material and preparation method thereof
  • A kind of carbon nitride photocatalytic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] This embodiment provides a method for preparing carbon nitride photocatalytic material by utilizing sludge modified concentrated urine, and the specific preparation steps are as follows:

[0045] Step 1: Urine concentration and sludge drying and dewatering:

[0046] Use a distillation flask and a reflux condenser to distill the collected urine (containing 3% urea by mass), and control the temperature to 100 ° C until the urine is evaporated to dryness to obtain a white crystal-like substance, which is urea; The sludge was centrifuged at 4000rpm for 5min, the obtained solid was placed in an oven, the ambient temperature was controlled to 105°C, and dried for 24h to obtain dry sludge;

[0047] Step 2: Grind and Mix:

[0048] Weigh 30 g of urea obtained in step 1 and mix with 20 g of dry sludge, place it in an agate mortar and grind to fully mix, obtain a sludge-activated urea precursor, and move it into a crucible with a lid;

[0049] Step 3: Pyrolysis:

[0050] Put the ...

Embodiment 2

[0054] This embodiment provides a method for preparing carbon nitride photocatalytic material by utilizing sludge modified concentrated urine, and the specific preparation steps are as follows:

[0055] Step 1: Urine concentration and sludge drying and dewatering:

[0056] Use a distillation flask and a reflux condenser to distill the collected urine (containing 3% urea by mass fraction), and control the temperature to 100 ° C until the urine is evaporated to dryness to obtain a white crystalline substance, which is urea; The sludge was centrifuged at 4000rpm for 5min, the obtained solid was placed in an oven, the ambient temperature was controlled to 105°C, and dried for 24h to obtain dry sludge;

[0057] Step 2: Grind and Mix:

[0058] Weigh 30 g of urea obtained in step 1 and mix with 15 g of dry sludge, place in an agate mortar and grind until fully mixed to obtain a sludge-activated urea precursor, and move it into a crucible with a lid;

[0059] Step 3: Pyrolysis:

[...

Embodiment 3

[0064] This embodiment provides a method for preparing carbon nitride photocatalytic material by utilizing sludge modified concentrated urine, and the specific preparation steps are as follows:

[0065] Step 1: Urine concentration and sludge drying and dewatering:

[0066] Use a distillation flask and a reflux condenser to distill the collected urine (containing 3% urea by mass fraction), and control the temperature to 100 ° C until the urine is evaporated to dryness to obtain a white crystalline substance, which is urea; The sludge was centrifuged at 4000rpm for 5min, the obtained solid was placed in an oven, the ambient temperature was controlled to 105°C, and dried for 24h to obtain dry sludge;

[0067] Step 2: Grind and Mix:

[0068] Weigh 20 g of urea obtained in step 1 and mix with 20 g of dry sludge, place it in an agate mortar and grind until fully mixed to obtain a sludge-activated urea precursor, and move it into a crucible with a lid;

[0069] Step 3: Pyrolysis: ...

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Abstract

The invention provides a carbon nitride photocatalytic material and a preparation method thereof, which are characterized by comprising the following steps: Step 1: distilling collected urine to obtain urea; centrifugally separating sewage sludge from a municipal sewage treatment plant to obtain solid Put it into an oven, control the ambient temperature to 100-110°C, and dry it for 12-24 hours to obtain dry sludge; Step 2: Mix the urea and dry sludge obtained in step 1 at a mass ratio of 1:0.5-1:1, and grind to obtain The sludge-activated urea precursor is moved to a crucible with a lid; Step 3: Put the lidded crucible containing the sludge-activated urea precursor into a muffle furnace, and the temperature is raised to 400°C for the first-stage pyrolysis for 2 hours. The second-stage pyrolysis is carried out at 500-550° C. for 2 hours; Step 4: Cool the muffle furnace to room temperature, take out the crucible, and the obtained product is the sludge-modified carbon nitride photocatalytic material. The degradation efficiency of the present invention is high.

Description

technical field [0001] The invention relates to the technical field of high-concentration organic wastewater treatment, in particular to a preparation method for preparing carbon nitride photocatalytic materials by utilizing sludge modified and concentrated urine. Background technique [0002] In recent years, with the increase in the amount of municipal sewage and industrial sewage treatment in my country, the amount of sludge produced has also increased sharply. At present, the disposal methods for sludge at home and abroad mainly include sludge landfill, sludge incineration, marine landfill, sludge composting and other sludge with high moisture content, and contain a large number of toxic and harmful pathogenic microorganisms and heavy metals. , arbitrary disposal will lead to serious environmental pollution. [0003] Sewage sludge is mainly composed of inorganic substances and organic components mainly composed of microorganisms. Sewage sludge can be carbonized during ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/32C02F101/30C02F101/38
CPCB01J27/24C02F1/32C02F2305/10C02F2101/308C02F2209/08C02F2101/40B01J35/61B01J35/39
Inventor 谷麟董光霞章凯俞海祥乔兴博闻海峰
Owner UNIV OF SHANGHAI FOR SCI & TECH
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