Preparation method and application of biological carbon-based iron carrying composite material

A composite material, biochar technology, applied in chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve problems such as difficulty in recycling, and achieve the effects of low cost and simple preparation process

Active Publication Date: 2019-11-15
HUNAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Facing the shortage of existing technical means to prepare magnetic biochar, simplifying the preparation process, improving the ability of biochar to absorb heavy metals, and solving the problems of difficult recovery in the process of biochar utilization, it is necessary to develop a more efficient and simple magnetic biochar preparation method

Method used

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  • Preparation method and application of biological carbon-based iron carrying composite material
  • Preparation method and application of biological carbon-based iron carrying composite material
  • Preparation method and application of biological carbon-based iron carrying composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Transplant pokeweed with a plant height of 10cm-20cm, and the pot culture soil is vermiculite. Spray Hoagland nutrient solution at the initial stage of cultivation, spray 2 times a day, once every 12 hours, spray 20mL-100mL Hoagland nutrient solution each time, continuously Spray for 10 days;

[0025] (2) Apply FeSO-containing 4 and Fe 2 (SO 4 ) 3 The nutrient solution mixed with iron salts, the Fe concentration is 400mg / L; spray 3 times a day, with an interval of 8 hours between each time, and spray continuously for 40 days;

[0026] (3) Collect Phytolacca plants, dry them at room temperature, and store them as biomass raw materials;

[0027](4) Use the microwave digestion method to determine the Fe content of pokeweed biomass raw materials as shown in Table 1.

[0028] Table 1 Fe content of pokeweed biomass

[0029] sample Fe (mg / g) pokeweed stem 1.675±0.154 Phytolacca 2.356±0.173 Shanglugen 1.965±0.185

Embodiment 2

[0031] (1) Take the dried FeSO 4 For the irrigated pokeweed leaf biomass, add an appropriate amount of deionized water to cover the leaves, put it into a high-pressure reactor, add NaOH at a concentration of 10 mg / mL, and add hydrazine hydrate at a volume ratio of 1:10;

[0032] (2) Add magnetic beads of appropriate size to the inner tank of the autoclave, put the autoclave into a collector type constant temperature heating magnetic stirrer, set the temperature at 180°C, the speed at 50rmp, and the reaction time at 12h;

[0033] (3) After cooling to room temperature, take out the autoclave, vacuum filter the mixed solution in the liner, and separate the solid biochar-based iron-carrying composite material;

[0034] (4) Remove 500mg / L of Cd with 300mg / L of biochar-based iron-loaded composite material 2+ With 30mg / L Cr 6+ ;

[0035] (5) After 10 minutes of adsorption, Cd 2+ The removal rate is 85.3%, Cr 6+ The removal rate is 77.5%;

[0036] (6) For adsorbed Cd 2+ The bio...

Embodiment 3

[0038] (1) Take the dried FeCl 3 For the irrigated pokeweed leaf biomass, add an appropriate amount of deionized water to cover the leaves, put it into a high-pressure reactor, add NaOH at a concentration of 10 mg / mL, and add hydrazine hydrate at a volume ratio of 1:20;

[0039] (2) Add magnetic beads of appropriate size to the inner tank of the autoclave, put the autoclave into a collector type constant temperature heating magnetic stirrer, set the temperature at 200°C, the speed at 100rmp, and the reaction time at 12h;

[0040] (3) After cooling to room temperature, take out the autoclave, vacuum filter the mixed solution in the liner, and separate the solid biochar-based iron-carrying composite material;

[0041] (4) Remove 500mg / L of Cd with 500mg / L of biochar-based iron-loaded composite material 2+ With 40mg / L Cr 6+ ;

[0042] (5) After 30 minutes of adsorption, Cd 2+ The removal rate is 98.7%, Cr 6+ The removal rate was 95.6%.

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Abstract

The invention relates to a preparation method and application of a biological carbon-based iron carrying composite material. The method mainly comprises the following steps of culturing pokeberry, solanum nigrum or polygonum hydropiper plants with a plant nutrient solution for 10-20 days, then continuing application of the iron-containing nutrient solution for 30-90 days, and harvesting the plants; drying the plants, and then carbonizing the plants by means of a hydrothermal method to prepare the biological carbon-based iron carrying composite material. The prepared biological carbon-based iron carrying composite material is simple in process and low in cost and can be used for adsorbing and removing heavy metals in water, and high-efficiency magnetic recovery is achieved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to the preparation of a biochar-based iron-carrying composite material and its application to the removal of heavy metal pollutants in water. Background technique [0002] Heavy metal pollutants in water seriously threaten the safety of water environment and endanger the health of water environment. The efficient and rapid removal of heavy metal pollutants in water is conducive to ensuring water safety and protecting people's health. At present, the main technologies for removing heavy metals in water include chemical precipitation, membrane separation, ion exchange, biological treatment, and adsorption. The chemical precipitation method has the disadvantages of high reagent consumption and easy to produce secondary pollution. The operation of the ion exchange method is too complicated and the cost is high. In the membrane separation method, the effect of microfiltration and ultrafi...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/0229B01J20/20B01J20/28009C02F1/283C02F2101/20
Inventor 陈章刘涛付豪冯涛陈国梁李志贤周剑林
Owner HUNAN UNIV OF SCI & TECH
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