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Method for producing nitrogen-doped porous biochar from waste biomass and application of nitrogen-doped porous biochar

A technology for waste biomass and biomass charcoal, which is applied in the field of environmental materials and biomass recycling, can solve problems such as pollution and heavy metal pollution, and achieve the effects of wide sources, high adsorption performance, and difficulty in secondary pollution.

Inactive Publication Date: 2019-08-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems of heavy metal pollution and high-efficiency resource utilization of biomass solid waste, the present invention aims at providing a method for efficient resource utilization of biomass solid waste for heavy metals such as lead, copper, chromium, and cadmium in water bodies, while solving heavy metal pollution question

Method used

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  • Method for producing nitrogen-doped porous biochar from waste biomass and application of nitrogen-doped porous biochar
  • Method for producing nitrogen-doped porous biochar from waste biomass and application of nitrogen-doped porous biochar
  • Method for producing nitrogen-doped porous biochar from waste biomass and application of nitrogen-doped porous biochar

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1: This example provides a method for preparing a nitrogen-doped porous biomass carbon material that adsorbs heavy metals

[0033] (1) Dry the mangosteen bark first, then grind it into powder with a crusher and a ball mill, weigh 1 g of the powder, add 10 mL of an aqueous solution containing 0.2 g of urea, 5 mL of an ethanol solution containing 0.02 g of P123, and ultrasonically After 1 h, stir for 12 h.

[0034] (2) The solution in step (1) was transferred to a hydrothermal reactor for hydrothermal treatment at 140 °C and maintained for 6 h. After taking it out, it was cooled to room temperature and the mixture was dried in a vacuum oven.

[0035] (3) Cool the solid in step (2) to room temperature, grind it into powder, and then raise the temperature to 400 °C at a rate of 2 °C / min under nitrogen atmosphere, keep it for 2 h, and then cool it to room temperature.

[0036] (4) The sample was ground into powder, washed three times with ethanol and water respecti...

Embodiment 2

[0037] Example 2: This example provides a method for preparing a nitrogen-doped porous biomass carbon material that adsorbs heavy metals

[0038] It includes the following steps:

[0039] (1) Dry the lemon peel first, then grind it into a powder with a crusher and a ball mill, weigh 1 g of the powder, add 10 mL of an aqueous solution containing 0.5 g of urea, 5 mL of an ethanol solution of 0.05 g P123, and sonicate for 1 h and then stirred for 12 h.

[0040] (2) The solution in step (1) was transferred to a hydrothermal reactor for hydrothermal treatment at 140 °C and maintained for 6 h. After taking it out, it was cooled to room temperature and the mixture was dried in a vacuum oven.

[0041] (3) The solid in step (2) was cooled to room temperature, ground into powder, and then heated to 400 °C at a heating rate of 5 °C / min under nitrogen atmosphere, kept for 2 h, and then cooled to room temperature.

[0042] (4) The sample was ground into powder, washed three times with e...

Embodiment 3

[0043] Example 3: This example provides a method for preparing a nitrogen-doped porous biomass carbon material that adsorbs heavy metals

[0044] It includes the following steps:

[0045] (1) Dry the watermelon rind first, then grind it into powder with a crusher and a ball mill, weigh 1 g of the powder, add 10 mL of an aqueous solution containing 0.5 g of ethylenediamine, 5 mL of an ethanol solution containing 0.02 CTAB, Sonicate for 1 h and then stir for 12 h.

[0046] (2) The solution in step (1) was transferred to a hydrothermal reactor for hydrothermal treatment at 140 °C and maintained for 6 h. After taking it out, it was cooled to room temperature and the mixture was dried in a vacuum oven.

[0047] (3) The solid in step (2) was cooled to room temperature, ground into powder, and then heated to 700 °C at a heating rate of 10 °C / min under nitrogen atmosphere, kept for 2 h, and then cooled to room temperature.

[0048] (4) The sample was ground into powder, washed three ...

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Abstract

The invention discloses a method for producing nitrogen-doped porous biochar from waste biomass and application of the nitrogen-doped porous biochar. The material produced by using a wide range of biomass of mangosteen peel, lemon peel, watermelon peel, banana peel and the like as raw materials through a template method and a hydrothermal method can efficiently remove heavy metal in water. The method for producing the nitrogen-doped porous biochar from the waste biomass comprises the following steps of (1) thoroughly washing, drying and crushing the peel, sequentially adding an aqueous solution in which a nitrogen source is dissolved and an ethanol solution in which a template agent is dissolved, and conducting stirring after ultrasonic treatment is conducted; (2) transferring a solution in the step (1) into a hydrothermal reactor, heating the hydrothermal reactor to 140 DEG C, maintaining the temperature for 6 h, and after a mixture is taken out, conducting cooling and vacuum drying;(3) grinding solid into powder, then heating the powder to 400-700 DEG C in a nitrogen atmosphere at the heating speed of 2-10 DEG C / min, maintaining the temperature for 2 h, and then cooling the powder to room temperature; and (4) washing a sample with ethyl alcohol three times, then washing the sample with water three times, and conducting vacuum drying to obtain the nitrogen-doped biochar material high in adsorption performance. According to the material, a production cycle is short, the process is simple and convenient, when the material is used for adsorbing the heavy metal of lead (Pb[II]), copper (Cu[II]), chromium (Cr[VI]), cadmium (Cd[II]) and the like, the adsorption efficiency is high, and the material can be recycled.

Description

technical field [0001] The invention belongs to the technical field of environmental materials and the field of biomass resource utilization, and specifically relates to a method for preparing nitrogen-doped porous biochar by using waste biomass and its application in adsorbing heavy metals. Background technique [0002] As a large industrial country, my country's annual industrial wastewater discharge has reached more than 20 billion tons, many of which contain heavy metal ions in the wastewater, such as electroplating wastewater containing a large amount of heavy metals such as Cd(II) and Pb(II); leather industry Among them, the wastewater in the tanning stage contains a large amount of Cr(VI); the acid mine wastewater contains more heavy metal Cu(II). If these heavy metal wastewater is not treated, it will endanger the aquatic ecology, and rely on the earth's ecological cycle to enter the soil and atmosphere, and ultimately endanger human health. Heavy metals are extremel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20C02F1/281C02F2101/20
Inventor 严凯李瑞琪仇荣亮
Owner SUN YAT SEN UNIV
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