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Biochar-based nanometer zero-valent iron material and preparation method thereof

A nano-zero valent iron and biochar technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as energy consumption, environmental pollution, poor material performance, etc. The effect of causing environmental pollution and enhancing the removal performance

Active Publication Date: 2019-06-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are several significant problems in this method: 1) The nano-zero-valent iron in the biochar-based nano-zero-valent iron material is mostly covered on the surface of the bio-char, and seldom can be wrapped into the interior of the bio-char, which will lead to material 2) sodium borohydride reduction method belongs to pure chemical method, which will cause environmental pollution and energy consumption

Method used

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  • Biochar-based nanometer zero-valent iron material and preparation method thereof
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  • Biochar-based nanometer zero-valent iron material and preparation method thereof

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preparation example Construction

[0028] The invention provides a preparation method of biochar-based nanometer zero-valent iron material, which comprises the following steps:

[0029] S1) dissolving the iron salt in water, and adding nitric acid to adjust the pH to less than 4.0;

[0030] S2) Add the ground and sieved biochar into the iron salt solution, and magnetically stir to obtain the composite material; the mass ratio of biochar to iron salt is 1:(2~3);

[0031] S3) drying the composite material, the dried composite material is subjected to a carbon thermal reduction reaction under the protection of nitrogen, and the biochar-based nanometer zero-valent iron material is obtained after cooling; the condition of the carbon thermal reduction reaction is 8-12 ° C. min -1 Heating at a rate of 600-800°C and keeping it for 1-2 hours.

[0032] Preferably, the iron salt is ferric nitrate or ferrous sulfate, and the concentration of the nitric acid is 2mol / L;

[0033] Preferably, in step S2, the biochar is prep...

Embodiment 1

[0038] The present embodiment provides a preparation method of biochar-based nanometer zero-valent iron material, which comprises the following steps:

[0039] S1) dissolving ferric nitrate in water, and adding 2mol / L nitric acid to adjust the pH to less than 4.0;

[0040] S2) Add the ground and sieved biochar into the iron salt solution, and stir magnetically for 9 hours to obtain the composite material; the biochar is prepared by pyrolyzing poplar leaves, rice husks, straw, corncobs or fruit husks at 300°C, The mass ratio of biochar to iron salt is 1:2;

[0041] S3) Dry the composite material. The drying method of the composite material is to dry at 105°C for 48 hours; put the dried composite material into a quartz boat (10cm×3cm), and place it in a tube furnace for charcoal thermal reduction under the protection of nitrogen. After cooling, the biochar-based nano-zero-valent iron material can be obtained; the condition of charcoal thermal reduction reaction is 10℃·min -1 T...

Embodiment 2

[0043] The present embodiment provides a preparation method of biochar-based nano zero-valent iron material, which comprises the following steps:

[0044] S1) dissolving ferric nitrate in water, and adding 2mol / L nitric acid to adjust the pH to less than 4.0;

[0045] S2) Add the ground and sieved biochar into the iron salt solution, and stir magnetically for 9.5 hours to obtain the composite material; the biochar is prepared by pyrolyzing poplar leaves, rice husks, straw, corncobs or fruit shells at 600 °C , the mass ratio of biochar to iron salt is 1:2.5;

[0046] S3) Dry the composite material. The drying method of the composite material is to dry at 105°C for 48 hours; put the dried composite material into a quartz boat (10cm×3cm), and place it in a tube furnace for charcoal thermal reduction under the protection of nitrogen. After cooling, the biochar-based nano-zero-valent iron material can be obtained; the condition of charcoal thermal reduction reaction is 8°C·min -1...

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Abstract

The invention discloses a biochar-based nanometer zero-valent iron material and a preparation method thereof, and belongs to the technical field of environmental protection materials. The preparationmethod comprises the following steps: dissolving an iron salt in water, and adding nitric acid to adjust pH; adding grinded and sieved biochar into the iron salt solution, performing magnetic stirringto obtain a composite material; and performing drying on the composite material, carrying out the carbothermal reduction reaction of the dried composite material under nitrogen protection, and performing cooling to obtain the biochar-based nanometer zero-valent iron material. The interior of the biochar-based nanometer zero-valent iron material is coated with a large amount of nanometer zero-valent iron, so that the removal performance of the biochar-based nanometer zero-valent iron material is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials, and in particular relates to a biochar-based nanometer zero-valent iron material and a preparation method thereof. Background technique [0002] Biochar is a new type of adsorbent with wide sources, low cost and environmental friendliness, which is a research hotspot in recent years. Current research shows that biochar has limited ability to remove heavy metals. Therefore, biochar needs to be modified to increase its specific surface area and the number of functional groups. Using biochar as a carrier and loading nano-iron particles with reduction catalytic ability is a composite material that can effectively remove pollutants. [0003] At present, biochar-based nano-zero-valent iron materials are mainly prepared by sodium borohydride reduction method. This method is to reduce the iron salt mixed with biochar into iron element through the strong reducibility of sodium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/30
Inventor 仇荣亮赵庭婕赵楠倪卓彪章卫华
Owner SUN YAT SEN UNIV
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