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Preparation method and application of a magnetic rape straw adsorption material

A technology of rape stalks and adsorption materials, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problems of restricting large-scale promotion and use, high preparation costs, and environmental pollution etc. to achieve good physical and chemical stability, low production cost and simple process

Active Publication Date: 2017-12-15
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these preparation methods, some methods have high processing costs and use toxic reagents such as toluene and isopropanol, which will pollute the environment; in addition, some methods have high preparation costs, which limits large-scale promotion and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of composite adsorbent.

[0027] (1) Crushing of raw materials: Cut the rape stalks into 3-5 cm, wash them with tap water, dry them, crush them with a grinder, and pass them through a 100-mesh sieve.

[0028] (2) Pretreatment with mixed lye: Soak 400 g of 100-mesh rape straw powder in 1000 mL of 10% NaOH ethanol solution for dewaxing, stir for 2 h, filter and drain, and keep the rape straw powder.

[0029] (3) Preparation of bark extract: put 15 g of pine bark; 5 g of oak bark; 5 g of larch into a 2000 mL large beaker and add 1000 mL of distilled water. Place the beaker in an ultrasonic extraction device for 3 h, filter and drain, and keep the filtrate for later use. The leaching solution contains tannin and polyphenols.

[0030] (4) Preparation of magnetic-egg white-rape straw powder mixture: add 400 g of rape straw powder prepared in step (2) in step (3), stir at 1500 r / min for 2 h, then add 5 g of magnetic Fe 3 o 4 and 30 g of fresh egg white were d...

Embodiment 2

[0035] 1. Preparation of composite adsorbent

[0036] (1) Crushing of raw materials: Cut the rape stalks into 3-5 cm, wash them with tap water, dry them, crush them with a pulverizer, and pass them through a 60-mesh sieve.

[0037] (2) Pretreatment with mixed lye: Soak 500 g of 60-mesh rape straw powder in 1000 mL of 5% NaOH ethanol solution, stir for 1.5 h, filter and drain, and keep the rape straw powder.

[0038] (3) Preparation of bark extract: put 10 g of pine bark; 15 g of oak bark; 10 g of larch into a 2000 mL large beaker and add 1000 mL of distilled water. Place the beaker in an ultrasonic extraction device for leaching for 2.5 h, filter and drain, and keep the filtrate for later use. The leaching solution contains tannin and polyphenols.

[0039] (4) Preparation of magnetic-egg white-rape straw powder mixture: add 500 g of rape straw powder prepared in step (2) in step (3), stir at 1500 r / min for 1.5 h, and then add 4 g of magnetic Fe 3 o 4 and 20 g of fresh egg ...

Embodiment 3

[0044] 1. Preparation of composite adsorbent

[0045] (1) Crushing of raw materials: Cut the rape stalks into 3-5 cm, wash them with tap water, dry them, grind them with a pulverizer, and pass them through a 150-mesh sieve.

[0046] (2) Pretreatment with mixed lye: Soak 600 g of 100-mesh rape straw powder in 1000 mL of 8% NaOH ethanol solution, stir for 2.5 h, filter and drain, and keep the rape straw powder.

[0047] (3) Preparation of bark extract: 10 g of pine bark; 20 g of oak bark; 5 g of larch in a 2000 mL large beaker, add 1000 mL of distilled water, and place the beaker in an ultrasonic extraction device for leaching After 3 hours, filter and drain, and keep the filtrate for later use. The leaching solution contains tannic acid and polyphenols.

[0048] (4) Preparation of magnetic-egg white-rape straw powder mixture: add 600 g of rape straw powder prepared in step (2) in step (3), stir at 1500 r / min for 1 h, then add 3 g of magnetic Fe 3 o 4 and 25 g of fresh egg wh...

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Abstract

The invention relates to a preparation method for a magnetic rape stalk adsorbing material and application; the preparation method is used for adsorbing heavy metal elements in wastewater and belongs to the technical field of environment protection. The method comprises the following steps: 1) crushing rape stalks to 60 to 150 meshes, and dewaxing in an alkaline solution; 2) mixing the dewaxed rape stalk powder and a bark extraction solution, and stirring; 3) adding magnetic Fe3O4 and an egg white solution, and carrying out ultrasonic dispersion; 4) dropwise adding a 3 to 7% glutaraldehyde solution, and heating, stirring and cross-linking at 60 to 80 DEG C to form a magnetic adsorbing material; 5) separating the product with a magnet, and then washing and drying to obtain the magnetic rape stalk powder compound heavy metal adsorbing material. The method disclosed by the invention is simple in process, low in production cost and is conductive to recovery of an absorbent because an external magnetic field is added for solid-liquid separation in the use process, and has a favorable application prospect in the aspect of treating wastewater polluted by heavy metals, namely lead, cadmium and nickel.

Description

technical field [0001] The invention relates to a preparation method and application of a magnetic / rape straw adsorption material, in particular to a preparation method of a heavy metal adsorption material, which is used for adsorption and removal of heavy metal ions in sewage, and belongs to the technical field of environmental protection. Background technique [0002] With the development of industrialization and urbanization, industrial "three wastes", domestic garbage, sewage irrigation, transportation, and unreasonable use of chemical fertilizers and pesticides have led to the accumulation of heavy metals in the soil and water environment year by year, and the pollution area has expanded year by year. However, heavy metals in soil are difficult to be chemically or biologically degraded in a short period of time, and are easy to accumulate through the biological chain, which will cause great harm to the natural environment, ecosystem and human health. Therefore, the cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30B01J20/28C02F1/28C02F101/20
CPCB01J20/06B01J20/24B01J20/28009B01J2220/46B01J2220/485C02F1/28C02F2101/20
Inventor 程先忠胡黎明张瑞华周国庆
Owner WUHAN POLYTECHNIC UNIVERSITY