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Modified hydrated iron oxide adsorbent, preparation method and application thereof

A technology of hydrated iron oxide and adsorbent, which is applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of low adsorption capacity, high cost of adsorbent, and difficulty in meeting market demand.

Inactive Publication Date: 2021-06-18
ANHUI AGRICULTURAL UNIVERSITY
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Problems solved by technology

Among all adsorbents, most adsorbents have high cost or low adsorption capacity, which is difficult to meet the market demand

Method used

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  • Modified hydrated iron oxide adsorbent, preparation method and application thereof

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Embodiment Construction

[0012] The specific technical solutions of the present invention are described with reference to the embodiments.

[0013] Dissolve 0, 0.2, 0.4, 0.8 and 1 g of chitosan in a 4% aqueous acetic acid solution (100 mL), then add 10 g of ferric chloride hexahydrate respectively, and stir with a magnetic stirrer for one hour until the mixture is completely dissolved. 0.1 mol / L NaOH was added to the mixture to adjust the pH to 7. After aging at room temperature for 24 hours, the precipitated particles were collected by centrifugation, and then washed with ultrapure water several times to remove residual ions. Finally, the precipitated particles were lyophilized, ground through a 200-mesh sieve in an agate mortar, and the resulting precipitated particles were collected and stored in a brown glass bottle.

[0014] The chitosan contents of 0, 0.2, 0.4, 0.8, 1 g were named as 0% C-mHFO, 2% C-mHFO, 4% C-mHFO, 6% C-mHFO, 8% C-mHFO and 10% C-mHFO, respectively C-mHFO.

[0015] The adsorp...

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Abstract

The invention provides a preparation method of a modified hydrated iron oxide adsorbent. The method comprises the following steps: dissolving 0.2-1g of chitosan in 100 mL of acetic acid aqueous solution with a mass concentration of 4%, then respectively adding 10 g of ferric chloride hexahydrate, and stirring for one hour by using a magnetic stirrer until the mixture is completely dissolved; adding 0.1 mol / L NaOH into the mixture to adjust the pH value to 7; aging at room temperature for 24 hours, centrifugally collecting precipitate particles, and washing with ultrapure water multiple times to remove residual ions; and finally, freeze-drying the precipitate particles, grinding in an agate mortar, sieving with a 200-mesh sieve, collecting the obtained precipitate particles, and storing in a brown glass bottle. According to the invention, ferric oxide hydrate is modified by chitosan, so that the adsorption capacity of the ferric oxide hydrate is improved, and the removal of pollutants, namely perfluorooctane sulfonic acid (PFOS), is facilitated.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a modified hydrated iron oxide adsorbent and a preparation method and application thereof. Background technique [0002] Perfluorooctane sulfonic acid (PFOS) is a stable fluorosurfactant widely used in carpet surface protectants, firefighting foams, food wrapping paper packaging and semiconductor industries. The molecular chain of PFOS is composed of a long hydrophobic fluorocarbon chain and a hydrophilic sulfonic acid group, which makes it have good hydrophobicity and hydrophilicity, which makes it more soluble in water than traditional hydrophobic pollutants. In the report, both groundwater and drinking water were polluted by PFOS to varying degrees. In recent years, a great deal of research has been carried out to effectively remove PFOS from water, mainly including adsorption, membrane filtration, sonochemical pyrolysis, advanced oxidation, etc. However...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30C02F101/34C02F101/36
CPCB01J20/06B01J20/24C02F1/288C02F2101/301C02F2101/34C02F2101/36C02F2101/40
Inventor 唐俊臧纪范世锁谢正鑫潘丹丹张丽君何宇婷
Owner ANHUI AGRICULTURAL UNIVERSITY
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