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Preparation method of biomass-based magnetic biochar

A biochar and biomass technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of cumbersome preparation process and long production cycle of biomass-based magnetic biochar, and achieve strong reaction selectivity and easy centralized recovery. Utilization, low cost effect

Inactive Publication Date: 2014-07-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing biomass-based magnetic biochar that aims to solve the defects of the prior art that the preparation process is cumbersome and the production cycle is long in order to overcome the defects of the above-mentioned prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The prepared biochar was sieved with 30 meshes and washed with acid; 1g of biochar was weighed and placed in 300mL ethylene glycol solution, ultrasonicated for 5min; then 2g of iron acetylacetonate (Fe(acac) 3 ), heated to 180°C for 0.5h under magnetic stirring and nitrogen flow, continued to heat to 275°C for 0.5h, cooled, cleaned, dried, and then sintered at 100°C under nitrogen protection.

Embodiment 2

[0027] Sieve the prepared biochar to 60 mesh, pickle; weigh 1g of biochar and place it in 150mL ethylene glycol solution, ultrasonicate for 5min; then add 2g of iron acetylacetonate Fe(acac) 3 , heated to 180°C for 0.5h under the condition of magnetic stirring and flowing nitrogen, continued heating to 275°C for 0.5h, cooled, washed, dried, and then sintered at 200°C under nitrogen protection.

Embodiment 3

[0029] Sieve the prepared biochar to 90 mesh and pickle; weigh 1g of biochar and place it in 100mL ethylene glycol solution, ultrasonicate for 5min; then add 2g of iron acetylacetonate Fe(acac) 3 , heated to 180°C for 0.5h under magnetic stirring and nitrogen flow, continued to heat to 275°C for 0.5h, cooled, washed, dried, and then sintered at 300°C under nitrogen protection.

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Abstract

The invention relates to a preparation method of biomass-based magnetic biochar. According to the preparation method, forestry and agricultural waste materials are taken as raw materials; biochar prepared via oxygen-limited pyrolysis or hydrothermal carbonization is taken as a substrate; magnetic nano-material Fe3O4 is obtained via iron precursor pyrolysis, loading of magnetic nano-material Fe3O4 onto the biochar substrate is realized in a polyhydric alcohol solution, and an obtained product is subjected to sintering under nitrogen protection so as to obtain stable magnetic nano particles with high crystallinity. Compared with existing technology, loading of in-situ synthesized Fe3O4 onto the surface of biochar is realized via pyrolysis; reaction selectivity and efficiency are high; size of the Fe3O4 nano particles and loading area on the surface of biochar are controllable; and operation is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of secondary resource utilization of agricultural and forestry waste, and in particular relates to a preparation method of biochar, in particular to a preparation method of biomass-based magnetic biochar. Background technique [0002] Biochar is a carbon-rich solid produced by low-temperature pyrolysis of biomass under oxygen-limited conditions. Its raw materials come from a wide range of sources, including rice husks, camphor tree branches, bamboo, livestock and poultry manure, and many other agricultural and forestry wastes. Unlike other carbonization materials (such as activated carbon), biochar is mainly used as a soil additive to improve soil fertility and increase soil carbon sinks, which can affect the migration and transformation behavior and bioavailability of toxic and harmful pollutants such as heavy metals and organic pollutants. However, biochar is often difficult to separate and recover after a...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/32
Inventor 李良严丽丽沈国清
Owner SHANGHAI JIAO TONG UNIV
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