Alkali-modified charcoal loaded zero-valent iron composite material as well as preparation method and application thereof

A technology of composite materials and biochar, applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of high cost and complicated preparation conditions, and achieve low cost, simple operation, The effect of increasing aroma

Pending Publication Date: 2022-04-01
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first two methods of loading zero-valent iron have high cost and complicated preparation conditions, and are generally used for laboratory-scale research, and the above methods inevitably produce pollution during the loading process

Method used

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  • Alkali-modified charcoal loaded zero-valent iron composite material as well as preparation method and application thereof
  • Alkali-modified charcoal loaded zero-valent iron composite material as well as preparation method and application thereof
  • Alkali-modified charcoal loaded zero-valent iron composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation steps of an alkali-modified biochar-loaded zero-valent iron composite material and a method for removing chlorinated hydrocarbons in sewage by using the composite material of the present invention specifically include the following steps:

[0059] Step (a): washing the wheat straw with ultrapure water, drying it in a 105°C oven for 24h for later use;

[0060] Step (b): pulverize the dried wheat straw with a pulverizer and pass through a 10-mesh sieve;

[0061] Step (c): put the wheat straw powder in step (b) in a ceramic crucible, cover with a lid, place it in a muffle furnace, adopt an oxygen-limiting method, and heat up to 700°C at a heating rate of 10°C / min, and the residence time is 10°C. After 2 hours, the heating was stopped until the muffle furnace was naturally cooled to room temperature and then taken out, sealed and stored to obtain the original biochar;

[0062] Step (d): grinding the original biochar in step (c) with an agate mortar and pass...

Embodiment 2

[0072] The preparation steps of an alkali-modified biochar-loaded zero-valent iron composite material and a method for removing chlorinated hydrocarbons in sewage by using the composite material of the present invention specifically include the following steps:

[0073] Step (a): washing the wheat straw with ultrapure water, drying it in an oven at 80°C for 20h for use;

[0074] Step (b): pulverize the dried wheat straw with a pulverizer and pass through a 10-mesh sieve;

[0075] Step (c): put the wheat straw powder in step (b) in a ceramic crucible, cover with a lid, place it in a muffle furnace, adopt an oxygen-limiting method, and heat up to 300 °C at a heating rate of 8 °C / min, and the residence time for 1.5h, then stop heating until the muffle furnace is naturally cooled to room temperature, then take it out, seal it and store it to obtain the original biochar;

[0076] Step (d): grinding the original biochar in step (c) with an agate mortar and passing through a 50-mesh s...

Embodiment 3

[0083] The preparation steps of an alkali-modified biochar-loaded zero-valent iron composite material and a method for removing chlorinated hydrocarbons in sewage by using the composite material of the present invention specifically include the following steps:

[0084] Step (a): washing the wheat straw with ultrapure water, drying it in an oven at 100°C for 18h for later use;

[0085] Step (b): pulverize the dried wheat straw with a pulverizer and pass through a 10-mesh sieve;

[0086] Step (c): put the wheat straw powder in step (b) in a ceramic crucible, cover with a lid, place it in a muffle furnace, adopt an oxygen-limiting method, and heat up to 500 °C at a heating rate of 9 °C / min, and the residence time is 9 °C / min. for 1.5h, then stop heating until the muffle furnace is naturally cooled to room temperature, then take it out, seal it and store it to obtain the original biochar;

[0087] Step (d): grinding the original biochar in step (c) with an agate mortar and passi...

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Abstract

The invention discloses an alkali-modified charcoal loaded zero-valent iron composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing original biochar from a biochar raw material by using a pyrolysis carbonization method, carrying out alkaline solution impregnation modification on the original biochar, stirring and fully contacting, washing with ultrapure water until the pH value is neutral, carrying out suction filtration, and drying to prepare alkali modified biochar; and the alkali modified biochar and zero-valent iron are subjected to ball milling, and the alkali modified zero-valent iron loaded composite material is prepared. The composite material prepared by the invention has a higher specific surface area, can effectively load zero-valent iron, and has better adsorption capacity and removal effect on chlorohydrocarbon in water. Adsorbed chlorinated hydrocarbon can be reduced by zero-valent iron, and secondary desorption is avoided. The composite material can be used for effectively adsorbing, reducing and removing chlorohydrocarbon in water, and has the characteristics of easiness in operation, high efficiency, greenness and the like.

Description

technical field [0001] The invention belongs to the comprehensive application field of environmental protection and waste recycling, and relates to an alkali-modified biochar-loaded zero-valent iron composite material, a preparation method thereof, and an application in removing chlorinated hydrocarbons in water. Background technique [0002] Pollution Status of Chlorinated Hydrocarbons [0003] Chlorinated hydrocarbons can be used as dry cleaning agents, extractants, chemical raw materials, etc., and are commonly used organic solvents in chemical, pharmaceutical, pesticide and other industries. Due to improper use of chlorinated hydrocarbons, chlorinated hydrocarbons contaminate water bodies and soil environment. Chlorinated hydrocarbons are usually denser than water, so they tend to infiltrate into soil and contaminate groundwater. When the amount of chlorinated hydrocarbons entering the water environment exceeds the self-purification capacity of the water environment, i...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F101/36
Inventor 陆海楠郭琳李青青刘芳曹卫承朱江黄宇皎周栋李晓曼徐佳成杨洁
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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