Preparation method of phosphorus-nitrogen co-doped biomass base porous carbon material for hexavalent chromium adsorption

A biomass and co-doping technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc. Low cost, easy industrial production, simple preparation steps and equipment

Inactive Publication Date: 2018-01-30
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low specific surface area of ​​unactivated biochar and the lack of functional groups make it impossible to graft PEI efficiently.

Method used

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  • Preparation method of phosphorus-nitrogen co-doped biomass base porous carbon material for hexavalent chromium adsorption
  • Preparation method of phosphorus-nitrogen co-doped biomass base porous carbon material for hexavalent chromium adsorption
  • Preparation method of phosphorus-nitrogen co-doped biomass base porous carbon material for hexavalent chromium adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix the precursor porous carbon with the PEI solution at a mass volume ratio of 1g:5ml, then put the mixed solution into a shaker, shake at 160rpm at 30°C for 24 hours; then add 1% glutaraldehyde solution, and continue to It was shaken for 30 minutes under the same conditions; after fully washing with deionized water, it was dried at 80 °C for 12 hours, and named as PPAB10. Table 1 lists the performance parameters of Example 1.

[0032] PPAB10 performance parameter in the embodiment 1 of table 1

[0033]

Embodiment 2

[0035] Using the preparation conditions of Example 1, the difference is that the mass volume ratio of the precursor porous carbon to PEI is 1g:0.5ml, and then add a 0.1% concentration of glutaraldehyde solution, then wash with deionized water, dry, and name it PPAB1 . Table 2 lists the performance parameters of Example 2.

[0036] PPAB1 performance parameter in the embodiment 2 of table 2

[0037]

Embodiment 3

[0039] Using the preparation conditions of Example 1, the difference is that the mass volume ratio of the precursor porous carbon to polyethyleneimine is 1g:1ml, and then add a 0.2% glutaraldehyde solution correspondingly, then wash with deionized water, dry, and name for PPAB2. Table 3 lists the performance parameters of Example 3.

[0040] PPAB2 performance parameter among the table 3 embodiment 3

[0041]

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Abstract

A preparation method of a phosphorus-nitrogen co-doped biomass base porous carbon material for hexavalent chromium adsorption includes the steps: premixing plant source biomass with phosphoric acid inproportion, stirring mixture in a 75-85 DEG C oil bath pan for 2 hours, increasing temperature to 130-150 DEG C, transferring the mixture into a muffle furnace, leading in nitrogen, carbonizing the mixture at the temperature of 450-550 DEG C for 2 hours and then cooling the mixture to room temperature; sufficiently washing the mixture by deionized water and drying the mixture at the temperature of 80 DEG C for 12-24 hours to obtain a miscellaneous phosphorus-carbon precursor; mixing the precursor and polyethyleneimine according to the mass volume ratio of 1kg:0.5-5L, placing the mixture intoa shaker at the temperature of 30 DEG C at 160rpm, vibrating the mixture for 24 hours, adding glutaraldehyde solution with the mass concentration of 0.1-1%, vibrating the mixture for 30 minutes, washing the mixture by the deionized water and drying the mixture at the temperature of 80 DEG C for 12-24 hours. The material has a hierarchical porous structure and rich nitrogen-containing phosphorus-containing functional groups, is large in hexavalent chromium adsorption quantity, wide in raw material source and low in cost, the preparation method is environmentally friendly, reaction conditions are mild, and industrial production is easily realized.

Description

technical field [0001] The invention relates to a heteroatom-containing multi-level porous material and a preparation method thereof, specifically a phosphoric acid-activated biomass as a carbonaceous precursor grafted with a nitrogen-containing functional group and used for the adsorption of hexavalent chromium. Preparation method of nitrogen co-doped biomass-based porous carbon material. Background technique [0002] Hexavalent chromium (Cr(VI)) is a priority pollutant of major concern in the environment. It is mutagenic and potentially carcinogenic. Chromium polluted water poses a major threat to public health. Therefore, effective removal of harmful Cr(VI) from wastewater Method development is an important task for healthy living. Adsorption is the most common method for removing Cr(VI) because of its simple operation and high removal efficiency. Compared with other adsorption materials, biomass-based carbon materials have attracted extensive attention due to their env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/22
Inventor 王珺陈世霞邓曙光
Owner NANCHANG UNIV
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