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Mg/Al hydrotalcite modified charcoal composite material and preparation method and application thereof

A composite material, hydrotalcite technology, applied in the field of biochar composite materials and its preparation, to achieve the effects of reduced preparation costs and time, environmental friendliness, and high removal efficiency

Active Publication Date: 2016-05-25
湖南飞博环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to develop a low-cost, high-efficiency Mg / Al hydrotalcite-modified biochar composite material that can be used to adsorb and treat dye pollutants.

Method used

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  • Mg/Al hydrotalcite modified charcoal composite material and preparation method and application thereof
  • Mg/Al hydrotalcite modified charcoal composite material and preparation method and application thereof
  • Mg/Al hydrotalcite modified charcoal composite material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0027] A kind of preparation of the biochar composite material modified by Mg / Al hydrotalcite of the present invention, the raw material of biochar selects the ramie stalk that leaves and bark are removed for use, and concrete preparation method is as follows:

[0028] The ramie stalks with leaves and skins removed were cleaned with deionized water, then dried at 80°C for 24 hours, the dried ramie stalks were pulverized, and passed through a 2mm sieve to obtain ramie stalk powder; 2.4g of AlCl 3 ·6H 2 O and 6.1 g of MgCl 2 ·6H 2 O was added to 400mL of ultrapure water, then the ramie stalk powder was added to the solution, and the mixed suspension was vibrated for 24 hours in a constant temperature water bath oscillation box (26°C) at a speed of 130 rpm to obtain suspension A, and then Take another 16.0g of NaOH and 13.25g of Na 2 CO 3 Add to 500mL of ultrapure water to obtain solution B; add suspension A and solution B to a three-necked flask at the same time and drop by ...

Embodiment 2

[0032] The biochar composite material modified by Mg / Al hydrotalcite of the present invention treats the crystal violet in waste water, comprises the following steps:

[0033]Take 50mL of crystal violet solution with an initial concentration of 5-500mg / L, add the biochar composite material modified by Mg / Al hydrotalcite prepared in Example 1, the amount of the adsorbent is 0.1g, and place in a constant temperature shaker in a water bath at 26°C Carry out oscillating adsorption reaction, separate this adsorbent from waste water by filtration after 24 hours, measure the content of unadsorbed crystal violet in waste water with spectrophotometer at 592nm place, the calculated adsorption amount result is as shown in table 1:

[0034] Table 1: Adsorption capacity data of adsorbents under different initial concentrations of crystal violet

[0035]

[0036] It can be seen from Table 1 that the adsorbent has an adsorption capacity of 24.75 mg / g when the initial concentration is 50 m...

Embodiment 3

[0038] The biochar composite material modified by Mg / Al hydrotalcite of the present invention treats the crystal violet in waste water, comprises the following steps:

[0039] Get 50mL of crystal violet solution with an initial concentration of 200mg / L, add the biochar composite material modified by Mg / Al hydrotalcite prepared in Example 1, and adjust the pH to 2.0~6.0. The amount of the adsorbent is 0.1g. ℃ water bath constant temperature oscillator for oscillating adsorption reaction. After 24 hours, the adsorbent was separated from the wastewater by filtration, and the content of unadsorbed crystal violet in the wastewater was measured at 592nm with a spectrophotometer. The calculated adsorption results are shown in the table 2 shows:

[0040] Table 2: Adsorption data of adsorbents on crystal violet under different pH conditions

[0041] pH

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Abstract

The invention relates to an Mg / Al hydrotalcite modified charcoal composite material and a preparation method and application thereof. According to the composite material, charcoal is used as a substrate, and roasted Mg / Al hydrotalcite is loaded on the surface of the substrate. The preparation method comprises the specific steps that biomass powder is soaked with an Mg / Al water solution at first, then, a composite of Mg / Al hydrotalcite and biomass is prepared, and finally the composite of Mg / Al hydrotalcite and biomass is pyrolyzed through a tubular atmosphere furnace in N2 atmosphere to obtain the product. In the preparation process of the Mg / Al hydrotalcite modified charcoal composite material, biomass pyrolysis and hydrotalcite roasting are carried out in one heat treatment process, the preparation cost is reduced, and the preparation time is shortened. The structure of the roasted Mg / Al hydrotalcite can be partially recovered to be hydrotalcite of an orderly stratified structure after the roasted Mg / Al hydrotalcite makes contact with the water. The Mg / Al hydrotalcite modified charcoal composite material has the good adsorption effect on dye in waste water.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and specifically relates to a biochar composite material modified by Mg / Al hydrotalcite and its preparation method and application. Background technique [0002] The discharge of industrial dye wastewater to water bodies has caused great harm to the environmental ecosystem. With the rapid development of industries such as textiles, printing, plastics, leather, and food production, a large amount of dye pollutants are discharged into water bodies. These pollutants are large in quantity, slow in degradation, and have toxic effects on humans and animals. Therefore, it is necessary to explore a cost-effective decolorization technology for industrial wastewater before discharge. General dye wastewater treatment methods include adsorption, catalytic degradation, biodegradation and membrane filtration. Among them, adsorption is a simple operation, ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/08B01J20/20C02F1/288C02F2101/308
Inventor 谭小飞刘云国顾岩岭曾光明刘少博胡新将王慧周璐李婷婷江卢华
Owner 湖南飞博环保科技有限公司
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