Magnetic biochar material for heavy metal waste water treatment and preparation method of magnetic biochar material

A biochar, heavy metal technology, applied in the directions of alkali metal compounds, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of difficult solid-liquid separation and difficult recycling of materials, and achieve good photocatalytic performance and excellent adsorption. Effects, effects that are easy to mass produce

Active Publication Date: 2018-07-24
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For adsorption materials, the adsorption efficiency is generally related to the specific surface area. In order to improve the adsorption capacity of the material, the specific s

Method used

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  • Magnetic biochar material for heavy metal waste water treatment and preparation method of magnetic biochar material
  • Magnetic biochar material for heavy metal waste water treatment and preparation method of magnetic biochar material
  • Magnetic biochar material for heavy metal waste water treatment and preparation method of magnetic biochar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A magnetic biochar material of the present invention is characterized in that the crosslinked chitosan gel is used as a carrier, and the gel is evenly loaded with magnetic BiFeO 3 Materials and molecules of kenaf biochar with high porosity. The magnetic biochar material is prepared by the following method:

[0021] (1) Weigh 0.08mol of ferric nitrate, 0.08mol of bismuth nitrate and 0.08mol of citric acid, the ratio is 1:1:1, dissolve the weighed solid ferric nitrate and bismuth nitrate in 200mL of ethylene glycol methyl Add 0.2 mL of nitric acid solution with a molar concentration of 0.1 mol / L to the ether, dissolve the weighed citric acid in 100 mL of ethylene glycol, mix the two solutions evenly, place the container containing the mixed solution in water at a temperature of 60°C Heating in a water bath for 1 hour, the obtained black solution was heated at a temperature of 100°C for 10 hours to obtain a light brown gel, which was put into a crucible and placed in a mu...

Embodiment 2

[0026] The magnetic biochar material of the present invention is used to remove hexavalent chromium ions in wastewater, comprising the following steps:

[0027]Take five parts of wastewater with a mass concentration of hexavalent chromium ions of 50mg / L, each with a volume of 50mL, put them in a clean Erlenmeyer flask, and adjust the pH to 2, 4, 6, 8, 10 with hydrochloric acid and sodium hydroxide solution, respectively. After labeling, the magnetic biochar material prepared in Example 1 is added to the waste water sample, and the dosage of the material in every liter of waste water is 4g, and the sealed Erlenmeyer flask is placed in a rotating speed of 150rpm as a reactor. In the constant temperature oscillation box, the temperature in the box was maintained at 30°C, and after 4 hours of oscillation reaction, the material was separated from the solution with a magnet, and the adsorption treatment of hexavalent chromium ions in the wastewater sample was completed. Adopt diphen...

Embodiment 3

[0032] The magnetic biochar material of the present invention is used to remove hexavalent chromium ions in wastewater, comprising the following steps:

[0033] Get three parts of hexavalent chromium concentration and be respectively 10mg / L, 50mg / L, 100mg / L waste water test solution, be placed in clean Erlenmeyer flask, adjust pH to be 2 with hydrochloric acid solution, after labeling is finished, embodiment 1 is made The magnetic biochar material is added to the wastewater sample, and the dosage of the material per liter of wastewater is 4g. The sealed Erlenmeyer flask is used as a reactor and placed in a constant temperature oscillation box with a rotation speed of 150rpm, and the temperature in the box is maintained at 30°C, oscillating for 4 hours and then using a magnet to separate the material from the solution to complete the adsorption treatment of hexavalent chromium ions in the wastewater sample. Adopt diphenylcarbazide spectrophotometry to measure the amount of unad...

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Abstract

The invention relates to a magnetic biochar material for heavy metal waste water treatment as well as a preparation method and a use of the magnetic biochar material. The material is prepared by taking kenaf biochar with large specific surface area and strong adsorption ability as a main body, combining the kenaf biochar with a bismuth ferrite material with the magnetism through chitosan, and performing crosslinking with glutaraldehyde. The preparation method concretely comprises the following steps of adding bismuth ferrite and the kenaf biochar material in thoroughly dissolved chitosan solution, enabling the three of the bismuth ferrite, the kenaf biochar material and the chitosan solution to be fully combined with mechanical stirring, using the glutaraldehyde as a crosslinking agent toenable the mechanical strength of the material to be strengthened, and grinding the dried materials to enable the specific surface area of the material to be further increased finally. The material has good adsorption effect to hexavalent chromium ions in heavy metal waste water, is strong in adsorption ability, liable in separation and recovery, low in preparation cost and simple in technology and is suitable for removal of the hexavalent chromium ions in waste water including smelting waste water, mine waste water, printing and dyeing waste water, chemical waste water and electroplating waste water.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and in particular relates to a preparation method and application of a magnetic biochar material. Background technique [0002] With the rapid development of economy, the problem of water pollution in our country is becoming more and more serious. Chromium exists in the form of hexavalent chromium and trivalent chromium in water. Due to the strong toxicity of hexavalent chromium, it has carcinogenic, mutagenic and cytogenetic toxicity, which can cause serious harm to human and animal bodies and even cause death. Therefore, wastewater with high chromium content, such as electroplating wastewater, mineral wastewater, metallurgical and chemical wastewater, etc., needs to be strictly treated, and can only be discharged after reaching the national standard. At present, the main methods for treating hexavalent chromium ions include electrolytic red...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/48C02F1/66C02F101/22
CPCB01J20/0229B01J20/0259B01J20/20B01J20/24B01J20/28009C02F1/281C02F1/283C02F1/286C02F1/488C02F1/66C02F2101/22
Inventor 胡新将周代玺赵运林束文圣邱国强王卫轩靳琦姬懿
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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