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Porous biochar/zinc ferrite composite material as well as preparation method and application thereof

A composite material and biochar technology, applied in the field of environmental functional materials and water treatment, can solve problems such as preparation process optimization, and achieve the effects of increasing the number of adsorption sites, reducing preparation costs, and high product recovery rate

Active Publication Date: 2021-02-23
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of most zinc ferrite composite materials only adds iron source and zinc source, and the preparation process is not optimized.

Method used

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  • Porous biochar/zinc ferrite composite material as well as preparation method and application thereof
  • Porous biochar/zinc ferrite composite material as well as preparation method and application thereof
  • Porous biochar/zinc ferrite composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Abandoned corn stalks were collected as biochar precursors in rural areas around Baotou City, Inner Mongolia Autonomous Region. Take it back, wash it, air-dry it, and then crush it. After sieving, the obtained powder is bagged for later use. First, take 20g corn stalk powder, choose it and ZnCl 2 The mass ratio is 1.5:1, put it in a beaker, add a small amount of deionized water, then perform magnetic stirring for 30 minutes, soak for 20 hours, and dry at 80°C for 24 hours. Subsequently, the mixture was pyrolyzed in a tube furnace at 600 °C for 1 h, and the heating rate during the pyrolysis was 10 °C min -1 , N 2 The purge rate is 200mL min -1 , and finally wash the pyrolysis product with deionized water to neutrality, and dry it to obtain porous biochar.

[0041] Take 1.36g (0.01mol) ZnCl 2 (AR) and 5.41g (0.02mol) FeCl 3 ·6H 2 O(AR), were dissolved in 15.0ml ultrapure water, and magnetically stirred for 10 minutes to make it evenly mixed. Then add 4g (0.02mol) ...

Embodiment 2

[0047] Utilizing the magnetic porous biochar zinc ferrite composite material of Example 1 of the present invention to adsorb radioactive thorium in the aqueous solution comprises the following steps:

[0048] Using the magnetic porous biochar zinc ferrite composite material obtained in Example 1 of the present invention to adsorb radioactive thorium in the aqueous solution comprises the following steps:

[0049] Get 25ml of thorium-containing solution whose initial concentration is 20~300mg / L, add the magnetic porous biochar / zinc ferrite composite material adsorbent that embodiment 1 makes, the consumption of this adsorbent is 1.2g / L, in constant temperature shaker After 4 hours, use a magnet to separate the adsorbent from the waste water, and use a UV spectrophotometer to measure the content of thorium in the solution that is not adsorbed by the magnetic composite material at 660nm. The calculated adsorption results are shown in Table 1. shown.

[0050] Table 1: Adsorption d...

Embodiment 3

[0055] In order to evaluate the reusability of the magnetic porous biochar zinc ferrite composite material, the present invention uses 25mL 0.05mol L -1 Citric acid desorbed 0.05g of thorium-adsorbed composite material for 6h, and carried out 5 cycles of adsorption-desorption cycle research under the same conditions, and the initial concentration of thorium in the adsorption experiment process was 50mg / L.

[0056] Table 2: Adsorption data of thorium by adsorbent in 5 desorption cycles

[0057]

[0058] It can be seen from Table 2 that under certain conditions, the adsorption capacity of the adsorbent still reaches 39.98 mg / g after 3 desorption cycles, and its adsorption capacity can reach 35.14 mg / g after 5 cycles. It shows that the magnetic porous biochar zinc ferrite composite material of the present invention has a good recycling effect.

[0059] Figure 7 It is the FT-IR diagram before and after 5 times analysis of the composite material in the embodiment of the prese...

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Abstract

The invention generally relates to the technical field of environmental functional materials and water treatment, and provides a porous biochar / zinc ferrite composite material; porous biochar serves as a matrix, magnetic zinc ferrite particles are loaded on the surface, and the particle size of the magnetic zinc ferrite particles is 50-400 nm; the mass ratio of the porous biochar to the zinc ferrite nanoparticles is (1:1) to (1:2); the specific surface area of the porous biochar is 1000-1200 m<2>*g<-1>, the pore volume is 0.40-0.50 cm<3>*g<-1>, and the pore diameter is 3.00-3.50 nm. Crop strawis used as a raw material for preparing the porous biochar, ZnCl2 analytically pure and FeCl3.6H2O analytically pure are used for preparing zinc ferrite, nitrilotriacetic acid is used for modification in the compounding process of the zinc ferrite and the porous biochar, and the obtained porous biochar / zinc ferrite composite material can be used for adsorbing heavy metals in water and enhancing the adsorption effect of the zinc ferrite; and an adsorbing material can be recycled by magnetic separation.

Description

technical field [0001] The invention generally relates to the technical fields of environmental functional materials and water treatment, and in particular to a porous biochar / zinc ferrite composite material and its preparation method and application. Background technique [0002] Due to the rapid development of industry and commerce in my country and the gradual improvement of living standards, the discharge of industrial, commercial and domestic sewage has increased year by year, and the heavy metal pollution has become increasingly serious. Among them, machinery manufacturing, steel production, textile factories, food The pollution discharge from factories and other industrial production is the main source of heavy metal pollution in water. Heavy metals are easy to accumulate, difficult to degrade and highly toxic, seriously endangering human health and the growth and development of animals and plants, and the structure and function of the ecosystem are also greatly affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/34C02F1/28C02F1/48C02F101/20
CPCB01J20/20B01J20/28009B01J20/3085B01J20/3078B01J20/3475C02F1/288C02F1/488B01J2220/4825C02F2101/20C02F2101/006C02F2303/16
Inventor 韩剑宏张连科王维大孙鹏李玉梅焦坤灵
Owner INNER MONGOLIA UNIV OF SCI & TECH
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