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Method for preparing chitosan-ferric oxide composite absorption arsenic removal material

A composite adsorption, iron oxide technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve the effects of good biocompatibility, wide distribution, and strong adsorption selectivity

Inactive Publication Date: 2010-01-13
SHANDONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Aiming at the limitations and defects of existing adsorption materials, the present invention provides a chitosan-iron oxide composite adsorption with large adsorption capacity, high adsorption efficiency, stable adsorption effect, strong adsorption selectivity, strong acid resistance and easy solid-liquid separation. Preparation method of arsenic removal material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Preparation of gel balls: 1g chitosan is dissolved in 50mL volume fraction of 2% acetic acid solution to obtain chitosan gel solution; chitosan gel solution is added dropwise to 3% NaOH solution After standing for 3 hours, wash to neutral.

[0013] (2) load iron: soak the chitosan gel ball obtained in 0.5mol / L FeSO 4 solution for 12 hours, then soaked in 4mol / L NaOH solution for 20 minutes, and washed until neutral.

[0014] (3) glutaraldehyde cross-linking: the gained iron-loaded chitosan pellet is immersed in a glutaraldehyde solution with a volume fraction of 2%, shakes at a constant temperature at 40° C. for 12 hours, and cleans the pellet with deionized water for 3 to 3 hours. 5 times to get the finished product.

[0015] Experiments show that iron oxide accounts for 56% of the dry weight of the adsorbent; for 50mL of 10mg / L As(III) and As(V) solutions, the adsorption capacity of 1.2g adsorbent particles is 0.33mg / (g wet particles) and 0.29 mg / (g wet granule...

Embodiment 2

[0017] (1) Preparation of gel balls: 1.5g chitosan is dissolved in 50mL volume fraction of 5% acetic acid solution; Wash to neutral after hours.

[0018] (2) load iron: soak the chitosan gel ball obtained in 0.5mol / L FeSO 4 solution for 12 hours, then soaked in 4mol / L NaOH solution for 20 minutes, and washed until neutral.

[0019] (3) glutaraldehyde cross-linking: the gained iron-loaded chitosan pellets are immersed in a 4% glutaraldehyde solution by volume fraction, shaken at a constant temperature at 40°C for 12 hours, and the pellets are cleaned with deionized water for 3- 5 times to get the finished product.

[0020] Experiments show that iron oxide accounts for 70% of the dry weight of the adsorbent; for 50mL of 10mg / L As(III) and As(V) solutions, the adsorption capacity of 1.2g adsorbent particles is 0.39mg / (g wet particles) and 0.37 mg / (g wet granules).

Embodiment 3

[0022] (1) Preparation of gel balls: 1g chitosan is dissolved in 50mL volume fraction of 2% acetic acid solution; the obtained chitosan gel solution is added dropwise to 3% NaOH solution and left to stand for 3 hours Post wash to neutral.

[0023] (2) load iron: soak the obtained chitosan gel ball in 0.25mol / L FeSO 4 solution for 18 hours, then soaked in 4mol / L NaOH solution for 20 minutes, and washed until neutral.

[0024] (3) glutaraldehyde cross-linking: the gained iron-loaded chitosan pellets are immersed in a 4% glutaraldehyde solution by volume fraction, shaken at a constant temperature at 40°C for 12 hours, and the pellets are cleaned with deionized water for 3- 5 times to get the finished product.

[0025] Experiments show that iron oxide accounts for 59% of the dry weight of the adsorbent; for 50mL of 10mg / L As(III) and As(V) solutions, the adsorption capacity of 1.2g adsorbent particles is 0.34mg / (g wet particles) and 0.31 mg / (g wet granules).

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Abstract

The invention relates to a method for preparing chitosan-ferric oxide composite absorption arsenic removal material, belonging to the technical field of water treatment. Based on the preparation of chitosan aquogel, gel balls of the chitosan aquogel are taken as matrix which is loaded with ferric oxide, and crosslinking treatment is carried out, so that the novel organic and inorganic composite material which is the chitosan-ferric oxide composite absorption arsenic removal material can be obtained. The composite absorption arsenic removal material has large adsorption capacity, high adsorption efficiency, strong adsorption selectivity and acid resistance as well as convenient solid-liquid separation, thus being an environment-friendly material which can be easily obtain and has low price and better application prospect.

Description

technical field [0001] The invention relates to a preparation method of a chitosan-iron oxide compound adsorption material for removing arsenic, which belongs to the technical field of water treatment. Background technique [0002] In recent years, the problem of arsenic pollution and arsenic poisoning in drinking water has attracted more and more attention, and related environmental pollution accidents have also occurred frequently. . At present, the methods used to remove arsenic at home and abroad mainly include coagulation precipitation, adsorption, ion exchange and chemical precipitation. Among them, the adsorption method has low cost, simple process and high efficiency, and is an ideal method for purifying trace arsenic pollution. Commonly used adsorbents for arsenic removal include titanium dioxide, activated alumina, hydrated iron oxide, manganese oxide, activated carbon, etc. In view of the more urgent requirements for the purification of arsenic pollution, it is...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/06C02F1/28C02F1/58
Inventor 王曙光孙雪菲李道波张成禄
Owner SHANDONG UNIV
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