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Method of preparing hexavalent chromium biological adsorption material by taking lotus seedpod as material

A technology of biological adsorption and hexavalent chromium, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc.

Active Publication Date: 2016-02-03
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific surface area of ​​the biochar prepared in this way is not high, and the heavy metal adsorption performance is affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (3) HNO with a mass fraction of 30% 3 , the temperature is 90 o Under the condition of C, after reacting for 10 h, wash with deionized water until the pH value is neutral.

[0018] (4) Under the condition that the mass fraction is 2% HCl, add 5mg / mL nano-iron powder with a diameter of 200nm, 60 o Under the condition of C, after reacting for 5 hours, wash with deionized water until the pH value is neutral.

[0019] (5) The sample is slowly immersed in liquid nitrogen at a speed of 1cm / min, and maintained in liquid nitrogen for 30 minutes.

[0020] (6) Take out the sample and freeze-dry for 48 hours.

[0021] (7) The prepared 2g / L biosorbent material was applied to remove 50mg / L hexavalent chromium in water, and the removal rate of hexavalent chromium was 96.4%.

[0022] Example 2

[0023] (1) Core-removed lotus pod shells were heated at room temperature for 25 o Dry under C condition for 15 days, chop, grind, and sieve with a sieve size of 15 mesh.

Embodiment 2

[0025] (3) HNO with a mass fraction of 50% 3 , the temperature is 90 o Under the condition of C, after reacting for 20 h, wash with deionized water until the pH value is neutral.

[0026] (4) Under the condition that the mass fraction is 2% HCl, add 10mg / mL nano-iron powder with a diameter of 500nm, 80 o Under the condition of C, after reacting for 10 h, wash with deionized water until the pH value is neutral.

[0027] (5) The sample is slowly immersed in liquid nitrogen at a speed of 1cm / min, and maintained in liquid nitrogen for 60 minutes.

[0028] (6) Take out the sample and freeze-dry for 48 hours.

[0029] (7) The prepared 5g / L biosorbent material was applied to remove 50mg / L hexavalent chromium in water, and the removal rate of hexavalent chromium was 98.7%.

[0030] Example 3

[0031] (1) Core-removed lotus pod shells were heated at room temperature for 30 o Dry for 15 days under the condition of C, chop, grind, and sieve with a sieve size of 20 mesh.

Embodiment 3

[0033] (3) HNO with a mass fraction of 40% 3 , the temperature is 100 o Under the condition of C, after reacting for 20 h, wash with deionized water until the pH value is neutral.

[0034] (4) Under the condition that the mass fraction is 5% HCl, add 10mg / mL nano-iron powder with a diameter of 200nm, 80 o Under the condition of C, after reacting for 10 h, wash with deionized water until the pH value is neutral.

[0035] (5) The sample is slowly immersed in liquid nitrogen at a speed of 1cm / min, and maintained in liquid nitrogen for 60 minutes.

[0036] (6) Take out the sample and freeze-dry for 48 hours.

[0037] (7) The prepared 5g / L biosorption material was applied to remove 150mg / L hexavalent chromium in water, and the removal rate of hexavalent chromium was 95.2%.

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Abstract

The invention discloses a method of preparing a hexavalent chromium biological adsorption material by taking lotus seedpod as a raw material. The lotus seedpod is dried at room temperature and then is prepared into carbon xerogel by using a hydrothermal process; under an acidic condition, the carbon xerogel is oxidated; under an acidic condition, the oxidated carbon xerogel is reduced by using nanometer iron powder, and magnetic carbon xerogel is prepared; the magnetic carbon xerogel is immersed into liquid nitrogen, and a sample is freeze-dried to be prepared into a heavy-metal adsorption material. The method is applied to heavy-metal hexavalent chromium adsorption in water.

Description

technical field [0001] The invention relates to a method for preparing hexavalent chromium bioabsorption material from lotus pods Background technique: [0002] As an important economic crop, lotus pods are widely planted in Hunan, Hubei and other places. The remaining lotus pod shells after processing lotus pods are non-edible parts. It is discarded as waste, causing waste of resources and pollution of the environment. In recent years, the research and application of heavy metal biosorption materials prepared by using agricultural and forestry crop biomass materials has attracted extensive attention. The application of remaining biomass materials after agricultural and forestry crop processing saves resources and reduces environmental pollution. At present, the use of residual biomass materials after processing agricultural and forestry crops, such as crop straw, rice husk, wood fiber, etc., to prepare biochar for heavy metal adsorption is mainly to carbonize biological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
Inventor 陈章李志贤陈国梁朱佳文
Owner HUNAN UNIV OF SCI & TECH
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