Activation method and application of biomass liquefaction residue

A technology of liquefaction residue and activation method, applied in the field of environmental protection and comprehensive utilization of resources, can solve the problems of no adsorption effect, low specific surface area, difficult separation and recovery, etc., and achieve the effects of easy magnetic separation, simple preparation process, and avoidance of resource waste.

Inactive Publication Date: 2013-11-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The carbon material obtained from biomass liquefaction has an aromatic core-shell structure and has certain activity; however, its specific surface area is low, so it has almost no adsorption effect on organic pollutants such as dyes; in addition, it also has the disadvantage of being difficult to separate and recover , easy to cause waste of resources and secondary pollution
Therefore, biochar materials cannot be directly used as adsorption materials for wastewater treatment.

Method used

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  • Activation method and application of biomass liquefaction residue
  • Activation method and application of biomass liquefaction residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Dry Salix salix biomass hydrothermal liquefaction residue, sieve 20 mesh; add the sieved residue to K 2 CO 3 Soak in aqueous solution for 24 hours, dry, the material and K 2 CO 3 The mass ratio is 1:2. Put the dried biochar material into the porcelain week, put it in a high-temperature box furnace, and raise the temperature to 700°C at a rate of 4°C / min under the protection of nitrogen atmosphere, and maintain it for 90min. After the temperature is cooled to room temperature, take it out, wash with water, and dry to obtain activated carbon particles AC-1. Measured by the specific surface area measuring instrument, its specific surface area is 1230m 2 / g, the pore volumes of total pores and micropores are 0.81 and 0.55cm 3 g -1 .

Embodiment 2

[0019] (2) Dry rice straw biomass hydrothermal liquefaction residue, sieve 20 mesh; add the sieved residue to K 2 CO 3 Soak in aqueous solution for 24 hours, dry, the material and K 2 CO 3 The mass ratio is 1:2. Put the dried biochar material into the porcelain week, put it in a high-temperature box furnace, and raise the temperature to 700°C at a rate of 4°C / min under the protection of nitrogen atmosphere, and maintain it for 90min. After the temperature is cooled to room temperature, take it out, wash with water, and dry to obtain activated carbon particles AC-2. Measured by the specific surface area measuring instrument, its specific surface area is 1334m 2 / g, the pore volume of total pores and micropores is 1.07 and 0.50cm 3 g -1 .

Embodiment 3

[0021] Activated carbon particles AC-1, sieved to 20 mesh, added to the iron salt solution, the mass ratio of activated carbon to iron oxide is 1:1, and the iron salt solution is FeCl 3 and FeSO 4 . 7H 2 For the mixed solution of O, the molar ratio is preferably 1:1. Under a water bath at 70°C, 100 mL of 5 mol / L NaOH solution was added dropwise with stirring, and aged for 3 hours. After the solid material is filtered, washed with water and dried, the magnetic carbon material M-1 is obtained. Measured by the specific surface area measuring instrument, its specific surface area is 673m 2 / g, the pore volumes of total pores and micropores are 0.65 and 0.28cm 3 g -1 . The prepared magnetic carbon material was measured by a vibrating sample magnetometer, and the saturation magnetic strength was 38.5 emu / g.

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Abstract

The invention belongs to the technical fields of environmental protection and comprehensive utilization of resources, and particularly relates to a biomass liquefaction residue activation method for recycling a biomass hydrothermal liquefaction residue and application of the biomass liquefaction residue. The specific process comprises the following steps: (1) activating a biomass liquefaction residue with acid or alkali to generate activated carbon particles; (2) performing in-situ synthesis on the activated carbon particles to generate magnetic particles, wherein the magnetic carbon material has high specific surface area, high pore volume and high magnetic intensity, and can be magnetically separated from a water solution; and (3) removing organic dye pollutants in wastewater with the magnetic carbon material. The invention has important promotion action on development of the biomass industry. The preparation method has the advantages of low energy consumption, environment friendliness, mild conditions, simple process, high adsorption capacity for dye organic pollutants, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource comprehensive utilization, specifically relates to the resource utilization of biomass hydrothermal liquefaction residue, and is a method for activating biomass liquefaction residue and its application. Background technique [0002] At present, the large-scale exploitation and utilization of fossil energy and the existence of problems such as environmental pollution and global warming caused by it make biomass utilization occupy an increasingly important position in the energy consumption structure. my country is rich in biomass resources, and a large amount of them are discarded or incinerated, causing serious environmental pollution. Hydrothermal liquefaction of biomass can convert it into liquid bio-oil and solid biochar materials, which is an efficient way of biomass utilization. The carbon material obtained from biomass liquefaction has an aromatic core-shell st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/48
Inventor 张士成朱向东刘雨辰周超陈建民
Owner FUDAN UNIV
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