Nitrogen-doped porous nano biochar, preparation method and application thereof

A nitrogen-doped and biochar technology is applied in the field of agricultural and forestry waste resource utilization and environmental treatment, which can solve problems such as pollution, waste of resources and the environment, and achieve the effects of cumbersome operation process, high preparation cost, and abundant active centers.

Pending Publication Date: 2022-06-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, usually a large number of discarded apple leaves are directly discarded, incinerated or landfilled without recycling and efficient utilization, resulting in a great waste of resources and serious environmental pollution.

Method used

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  • Nitrogen-doped porous nano biochar, preparation method and application thereof
  • Nitrogen-doped porous nano biochar, preparation method and application thereof
  • Nitrogen-doped porous nano biochar, preparation method and application thereof

Examples

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preparation example Construction

[0037] A method for synthesizing nitrogen-doped porous nano-biochar of the present invention comprises the following steps:

[0038] The discarded apple leaves collected in the farmland are cleaned, dried and ground into powder. Then, the leaf powder and NaOH are mixed evenly in a ratio of 1:3 by mass and spread in a porcelain boat. 2 Under the protection of the atmosphere, it was heated to 400 °C for 2 hours in a muffle furnace at a rate of 3 to 5 °C / min to make it fully carbonized, and then heated to 500 to 700 °C at the same heating rate for 2 to 3 hours. The sample reacts with NaOH at high temperature. At this stage, NaOH can be used as an activator to increase the porosity and specific surface area of ​​biochar. When the temperature of the muffle furnace drops to room temperature, the black reactants after sintering are collected, and then 1 mol / The nitrogen-doped porous nano-biochar was obtained by washing the black samples after washing with 1 L of HCl solution twice,...

example 1

[0041] 1), will be as figure 1 The discarded apple leaves shown were collected, washed with deionized water, dried in an oven at 80° C. for 24 h, and then ground into powder with a mortar.

[0042] 2), then mix 1g of leaf powder with 3g of NaOH and spread it in the porcelain boat. 2 Under the protection of the atmosphere, in a muffle furnace at a heating rate of 5 °C / min, heat to 400 °C for 2 h.

[0043] 3), then heat up to 500°C at a heating rate of 5°C / min, and keep the temperature for 3h. When the temperature of the muffle furnace drops to room temperature, collect the black reactants after sintering, then wash with 1 mol / L HCl twice, and then wash twice with deionized water, collect the black samples after cleaning, and dry them at 80 °C spare.

[0044] 4), figure 2 It can be seen that the SEM photograph of BC-500 °C shows that it is a 3D porous sheet-like structure with a sheet thickness of about 45 nm. Figure 5 It can be seen that C at BC-500°C 1s The XPS spectr...

example 2

[0046] 1), will be as figure 1 The discarded apple leaves shown were collected, washed with deionized water, dried in an oven at 80° C. for 24 h, and then ground into powder with a mortar.

[0047] 2), mix 1g leaf powder and 3g NaOH evenly and spread in the porcelain boat, in N 2 Under the protection of the atmosphere, in a muffle furnace at a heating rate of 5 °C / min, heat to 400 °C for 2 h.

[0048] 3), then heat up to 600°C at a heating rate of 5°C / min, and keep the temperature for 3h. When the temperature of the muffle furnace drops to room temperature, collect the black reactants after sintering, then wash with 1 mol / L HCl twice, and then wash twice with deionized water, collect the black samples after cleaning, and dry them at 80 °C spare.

[0049] 4), image 3 It can be seen that the SEM image of BC-600 °C shows that it is a 3D porous sheet-like structure with a sheet thickness of about 30 nm. Figure 5 It can be seen that C at BC-600°C 1s The XPS spectrum is com...

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Abstract

The invention provides nitrogen-doped porous nano biochar as well as a preparation method and application thereof, and the method comprises the following steps: step 1, carrying out heat preservation treatment on a mixture of apple leaf powder and (KOH or NaOH and the like) under the protection of inert gas or N2 atmosphere at 500-700 DEG C to obtain a reactant; and step 2, removing by-products and impurities in the reactants, and drying to obtain the nitrogen-doped porous nano biochar. The waste apple leaves are used as a carbon source, the process is simple, the cost is low, and the obtained biochar has a large specific surface area, rich surface functional groups and a nanoscale 3D porous lamellar structure, can adsorb and activate PDS to synergistically remove organic pollutant tetracycline in water as a pollution-free carbon functional material, and has potential practical application value.

Description

technical field [0001] The invention relates to the fields of agricultural and forestry waste resource utilization and environmental treatment, in particular to a nitrogen-doped porous nano biochar, a preparation method and an application thereof. Background technique [0002] With the rapid development of the chemical industry, the production, use and discharge of tens of thousands of chemicals have increased environmental burdens and health risks. Among them, pharmaceuticals and personal care products (PPCPs) are a class of chemicals that are used in large quantities and are widely used. , in recent years, it has been continuously discharged into environmental water bodies through human activities. Due to the low biochemical degradation rate of PPCPs, traditional sewage treatment plants cannot completely remove these compounds. The accumulation of PPCPs in natural aquatic environments has a range of potential adverse effects on human health and ecosystems. Therefore, it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/38C02F101/34
CPCB01J20/20B01J20/02B01J20/28054B01J20/2808C02F1/283B01J2220/4825C02F2101/38C02F2101/34Y02E60/13
Inventor 王传义任海涛王慧
Owner SHAANXI UNIV OF SCI & TECH
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