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

A technology of biomass charcoal and adsorption material, applied in the field of environmental engineering, can solve the problems of inability to effectively remove drinking water degrading organic matter, increase adsorption performance and adsorption stability, etc., and achieve easy large-scale production, increase adsorption performance and adsorption stability. Effective and efficient removal

Pending Publication Date: 2022-07-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0018] In order to solve the problem that the existing technology cannot effectively remove the refractory organic matter in the environmental concentration of drinking water, a transition metal or rare earth metal single atom is introduced into the carbon-based material structure to construct a metal single atom adsorption site; the second shell of the metal single atom C atoms can effectively activate the outer electronic orbitals of metal atoms, which can form a strong interaction and enhance the electron migration ability, which can further increase the adsorption performance and adsorption stability of this type of material for target pollutants.

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

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preparation example Construction

[0034] Based on the above-mentioned metal single-atom-doped biomass carbon adsorption material, the present invention also discloses a preparation method of a metal single-atom-doped biomass carbon adsorption material, characterized in that the steps are as follows:

[0035] Step 1: First put the dry biomass into a 4mol / L sodium hydroxide solution, the mass ratio of the dry biomass and sodium hydroxide is 2:1-1:2, carry out the pretreatment process, and stir at room temperature for 12-36h. (Among them, too much sodium hydroxide dosage will cause excessive hydrolysis of cellulose components in the biomass material, which in turn affects the single-atom loading; too little sodium hydroxide dosage will cause lignin in the biomass structure to be removed. Insufficient hydrolysis of the components affects the structural rearrangement of carbon in the subsequent calcination process.) After that, the reaction solution is put into an oven, and the temperature is adjusted to 60-80° C. f...

Embodiment 1

[0039] Preparation of metal single-atom doped biomass carbon adsorption materials:

[0040] Preferably coconut shell is used as biomass material, first put 10g dry coconut shell into 4mol / L sodium hydroxide solution, the mass ratio of dry coconut shell and sodium hydroxide is 1:1, carry out the pretreatment process, stir at room temperature for 36h, After that, the reaction solution was put into an oven, and the temperature was adjusted to 60° C. to react for 24 hours. Take out the coconut shell after pretreatment, and clean the residual alkaline solution on the surface. It was then put into a 0.03 mol / L ferric chloride aqueous solution, the molar amount of ferric chloride added was 0.02 times the molar amount of sodium hydroxide added, and the mixture was stirred at room temperature for 24 hours. After that, the reaction solution was placed in a 60° C. oven until the reaction solution was completely dried, and then placed in a corundum porcelain boat. Take 1g of sodium hydr...

Embodiment 2

[0043] The adsorption performance ratio of different metal single-atom doped biomass carbon materials: using perfluorooctanoic acid (PFOA), ciprofloxacin (CIP) and tris(2-chloroethyl) phosphate (TCEP) as target pollutants, respectively, prepared with tap water The 1 μg / L aqueous solution was used as the influent, and the BC-Fe 1 , BC-Cu 1 , BC-Ni 1 , BC-Sc 1 , BC-Mn 1 , BC-V 1 , BC-Ti 1 , BC-Sm 1 , BC-Er 1 , BC-Ce 1 , BC-Eu 1 and BC-Nd 1 The material is ground, sieved with a 40-mesh sieve, filled with a filter column after sieving, and placed in a dynamic adsorption test system, the test temperature is 25 ° C, and the continuous operation is 48 hours. After filtration through the filter membrane, put it in a plastic sample bottle at 60°C to evaporate the water, elute the sample bottle with 2 mL of ultrapure water, rinse it three times, and then use solid-phase extraction to extract the organic matter in it for testing.

[0044] The PFOA in the samples was determined...

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Abstract

The invention relates to a metal monatomic doped biomass charcoal adsorption material, a preparation method and application thereof. The metal monatomic doped biomass charcoal adsorption material has the advantages that the environmental concentration in drinking water is 0.3 mu g / Llt; clt; ct; 1 [mu] g / L) difficult-to-degrade organic matters are efficiently adsorbed and removed. An atomic-scale heterojunction interface exists in the material, so that an effective interface electric field can be formed, a monatomic structure is combined, an effective electron migration channel is constructed, and the electron migration capability is enhanced. In the process of adsorbing the organic matters with the environment concentration difficult to degrade in the water body, metal monatomic atoms generate relatively strong coulomb force and can attract a part with heterogeneous charges in a target object; c atoms in the second shell layer belonging to metal single atoms can effectively activate electrons in electron orbits on the outer layers of the metal atoms, and strong interaction between the C atoms and the electrons can further improve the adsorption performance and the adsorption stability, so that high-efficiency removal of environment-concentration refractory organics in drinking water is realized. In addition, the adsorption material is simple in preparation process, wide in raw material source, low in price and easy for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, relates to the research on the preparation technology of transition metal and rare earth metal single-atom doped biomass carbon materials, and particularly relates to the innovation of the high-efficiency adsorption method for refractory organic matter in drinking water by applying such materials. Background technique [0002] In recent years, refractory organic matter has been frequently detected in surface water and groundwater, so it has gradually attracted extensive attention of researchers. Such substances generally have the characteristics of genotoxicity, persistence, bioaccumulation and long-distance migration. There are a wide variety of refractory organic pollutants, including persistent organic pollutants, environmental endocrine disruptors, and pharmaceuticals and personal care products. Even the environmental concentration level (0.3μg / L<c<1μg / L) of these pol...

Claims

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Application Information

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IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J20/20B01J20/06C02F1/281C02F1/283C02F2101/36C02F2101/34C02F2101/30C02F2101/38
Inventor 牛军峰于明川周玉菲赵坤
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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