Micron zero-valent iron-loaded biochar for removing hexavalent chromium, and preparation method and application thereof

A technology of biochar and zero-valent iron, applied in chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve the problems of complex preparation conditions and high cost, and achieve the effect of simple process, low cost and stable source

Inactive Publication Date: 2021-07-27
CHANGZHOU UNIV
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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

Method used

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  • Micron zero-valent iron-loaded biochar for removing hexavalent chromium, and preparation method and application thereof
  • Micron zero-valent iron-loaded biochar for removing hexavalent chromium, and preparation method and application thereof
  • Micron zero-valent iron-loaded biochar for removing hexavalent chromium, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Micron-loaded zero-valent iron biochar material: wash rice straw with deionized water, dry it in an oven at 90°C for 12 hours, cut it into pieces with a diameter of 1-2 mm, grind and pass through a 100-mesh sieve to obtain rice straw powder, Put 3g of rice straw powder into a tube furnace, heat up to 500°C at a rate of 10°C / min under vacuum, and continue to calcine at this temperature for two hours, and then cool to room temperature to obtain rice straw biochar BC Get 2gBC and 8g3000 order mZVI to mix and place in the stainless steel vacuum ball mill jar, add 500g stainless steel balls in the ball mill jar simultaneously, the mass ratio that diameter is 15mm, 5mm, 3mm stainless steel ball is 2:5:3. The ball mill jar was fixed with a cover, and sealed after evacuating for 30 minutes. The ball mill jar was fixed in a ball mill, the rotation speed was set at 400 rpm / min, and the ball milling time was 1.5 h to obtain mZVI-BC-1.

[0020] The XRD analysis results of mZVI-BC ...

Embodiment 2

[0022] Micron-loaded zero-valent iron biochar material: wash rice straw with deionized water, dry it in an oven at 90°C for 12 hours, cut it into pieces with a diameter of 1-2 mm, grind and pass through a 100-mesh sieve to obtain rice straw powder, Put 3g of rice straw powder into a tube furnace, heat up to 500°C at a rate of 10°C / min under vacuum, and continue to calcine at this temperature for two hours, and then cool to room temperature to obtain rice straw biochar BC Get 4gBC and 6g3000 order mZVI to mix and place in the stainless steel vacuum ball mill jar, add 500g stainless steel balls in the ball mill jar simultaneously, the mass ratio that diameter is 15mm, 5mm, 3mm stainless steel ball is 2:5:3. The ball mill jar was fixed with a cover, and sealed after evacuating for 30 minutes. The ball mill jar was fixed in a ball mill, the rotation speed was set at 400 rpm / min, and the ball milling time was 1.5 h to obtain mZVI-BC-2.

Embodiment 3

[0024] Micron-loaded zero-valent iron biochar material: wash rice straw with deionized water, dry it in an oven at 90°C for 12 hours, cut it into pieces with a diameter of 1-2mm, grind and pass through a 100-mesh sieve to obtain rice straw powder, Put 3g of rice straw powder into a tube furnace, heat up to 500°C at a rate of 10°C / min under vacuum, and continue to calcine at this temperature for two hours, and then cool to room temperature to obtain rice straw biochar BC Get 5gBC and 5g3000 order mZVI to mix and place in the stainless steel vacuum ball mill jar, add 500g stainless steel balls in the ball mill jar simultaneously, the mass ratio that diameter is 15mm, 5mm, 3mm stainless steel ball is 2:5:3. The ball mill jar was fixed with a cover, and sealed after evacuating for 30 minutes. The ball mill jar was fixed in a ball mill, the rotation speed was set at 400 rpm / min, and the ball milling time was 1.5 h to obtain mZVI-BC-3.

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Abstract

The invention discloses a micron zero-valent iron-loaded biochar for removing hexavalent chromium, and a preparation method and application thereof, and belongs to the field of environmental functional materials and biomass resource utilization. The preparation method comprises the following steps: drying, grinding and sieving rice straws, and calcining at high temperature in a vacuum tubular furnace to obtain rice straw biochar BC; and mixing micron zero-valent iron (mZVI) with the particle size of 3000 meshes and the BC according to a mass ratio of 1: (0.25-4), putting the mixture into a stainless steel vacuum ball milling tank, putting stainless steel ball milling balls, covering and fixing, vacuumizing for 30 minutes, sealing, and operating a ball milling device for 0.5-2 hours to obtain the micron zero-valent iron loaded biochar material mZVI-BC. The technology is simple, the preparation raw materials have the advantages of being stable in source, low in cost and the like, high-concentration hexavalent chromium in the water body can be efficiently and rapidly removed, and meanwhile a new way is provided for resource utilization of the rice straw.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and biomass resource utilization, and specifically relates to a preparation method and application of micron-loaded zero-valent iron biochar for removing high-concentration hexavalent chromium. Background technique [0002] In the environment, chromium mainly exists in the oxidation state of hexavalent chromium (Cr(VI)) and the less toxic trivalent chromium (Cr(III)). Compared with Cr(III), Cr(VI) is more harmful to public health and Environmental hazards are greater. Cr(VI) will be produced in electroplating, leather tanning, dyeing and wood preservation industries, and the discharge of Cr(VI) industrial waste into rivers and surface water will seriously pollute human drinking water, causing serious damage to the human nervous system, liver and brain. serious health problems. Therefore, promoting more efficient and non-secondary pollution methods to remove Cr(VI) in water has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/28B01J20/20B01J20/02B01J20/28B01J20/30C02F101/22
CPCC02F1/00C02F1/281C02F1/285C02F1/705B01J20/20B01J20/02B01J20/28007C02F2101/22
Inventor 周四海王利平蒋善庆张亚楠康旭栋
Owner CHANGZHOU UNIV
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