K monatomic doped biomass charcoal adsorption material as well as preparation method and application thereof

A technology of adsorption material and biomass charcoal, applied in the field of environmental engineering, can solve problems such as inability to effectively remove water bodies, and achieve the effect of low cost and wide sources

Active Publication Date: 2022-07-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing technology cannot effectively remove the environmental concentration of PFOA and PFOS in the water body, K single atoms are introduced into the biochar substrate to construct non-equivalent double adsorption sites, form effective electron transfer channels, and enhance the charge transfer ability. Furthermore, the adsorption performance of the material is increased to achieve effective adsorption of target pollutants. The present invention discloses a K single-atom-doped biomass carbon adsorption material, a preparation method and its application. The technical scheme is as follows:

Method used

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  • K monatomic doped biomass charcoal adsorption material as well as preparation method and application thereof

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preparation example Construction

[0022] Based on the above-mentioned K single-atom-doped biomass carbon adsorption material, the present invention discloses a preparation method of the K single-atom-doped biomass carbon adsorption material, which is characterized by comprising the following steps:

[0023] Step 1: Use deionized water to prepare a KOH solution with a concentration of 1-4mol / L, put the dried coconut shells into the KOH solution, the mass ratio of coconut shells to KOH is 2:1-1:3, and stir at room temperature for 12-24h ; Among them, when the KOH concentration is lower than 1 mol / L, the lignin components in the coconut shell cannot be effectively removed; when the KOH concentration is higher than 4 mol / L, excessive KOH will cause excessive hydrolysis of the cellulose components in the coconut shell, Influence the subsequent single-atom loading and product adsorption performance.

[0024] Step 2: put the solution into an oven, bake at a certain temperature, and ripen; then take out the coconut sh...

Embodiment 1

[0033] Preparation of K single-atom-doped biomass carbon adsorption materials:

[0034] Prepare 200 mL of 3 mol / L KOH solution with deionized water, put 20 g of dried coconut shells into the KOH solution, and stir at room temperature for 24 h. After that, the solution was put into an oven at 60° C. for 72 hours of aging. Then take out the coconut shell from the reaction solution, put it into a crucible, and dry it in an oven at 60°C. After it is completely dried, the matured coconut shell is weighed to 15 g, and 2 g of KOH is poured into the bottom of the crucible. On top of KOH, place the crucible in a tube furnace, under N 2 Calcined in the atmosphere, the heating rate was 5 °C / min, the gradient was heated, and the temperature was maintained at 300, 500, 700 and 1000 °C for 1 h, respectively. After the reaction, it was naturally cooled to room temperature and taken out. Prepare 130mL of 0.5mol / L HCl aqueous solution, crush the calcined material, pour it into the HCl aqueou...

Embodiment 2

[0037] Ambient concentration PFOA / PFOS adsorption method in deionized water: 1 μg / L PFOA and PFOS were prepared in deionized water, respectively, and BC-K 1 -2 Grind the material, sieve it with a 40-mesh sieve, add the sieved powder to a filter column with a diameter of 0.8cm, fill the filter column, add sand filter plates before and after the filter column to prevent the leakage of the adsorbent, fix the cock, and put it into the dynamic adsorption test system , the test temperature was 25°C, the deionized water of 1 μg / L PFOA and PFOS were used as the influent water, and BC-K was used. 1 -2 removal by dynamic adsorption system, continuous operation for 48h, take 50ml of effluent per hour as the test sample, after the test sample is filtered with a 0.22μm filter membrane, put it in a plastic sample bottle at 60°C to evaporate the water, and use 2mL of HPLC grade methanol to elute the sample bottle, rinsed 3 times, and reserved for instrument testing.

[0038]The concentratio...

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Abstract

The invention relates to a K monatomic doped biomass charcoal adsorption material as well as a preparation method and application thereof. Clt; ct; 1 [mu] g/L) perfluorooctanoic acid (PFOS) and perfluorooctane sulfonic acid (PFOS) are efficiently adsorbed and removed. Dry coconut shells and KOH are used as precursors, and the K monatomic doped coconut shell carbon adsorption material is prepared through a curing-induced calcination method. The local charge density of the substrate can be changed through doping of K monatomic, and an effective electron migration channel is constructed; the adsorption capacity and the adsorption stability of the BC-K1 on PFOA and PFOS can be remarkably enhanced through the synergistic effect of non-equivalent double sites formed by K single atoms and adjacent C. According to the invention, environmental concentrations PFOA and PFOS in deionized water, tap water and lake water are adsorbed in a dynamic adsorption system, the adsorption rate reaches 96% or above, and the concentration of target pollutants in effluent can be maintained to be 70 ng/L or below.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and particularly relates to the innovation of the efficient adsorption method of perfluorinated compounds with environmental concentration in water by using the material, and relates to K single-atom doped biomass carbon adsorption material, preparation method and application. Background technique [0002] Perfluorinated compounds in water are typical persistent organic pollutants, which seriously threaten the ecological environment and human health. The U.S. Environmental Protection Agency (USEPA) has set the combined upper limit of health recommendations for two typical perfluorinated compounds perfluorooctanoic acid (PFOS) and perfluorooctane sulfonic acid (PFOS) in drinking water to 70ng / L (C PFOA+PFOS <70ng / L), such as prior art: USEPA, Fact sheet: PFOA&PFOS drinking water health advisories, 2016. https: / / www.epa.gov / groundwater-and-drinking-water / drinking-water-heal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/36
CPCB01J20/041B01J20/20C02F1/281C02F1/283C02F2101/36
Inventor 于明川周玉菲牛军峰赵坤
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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