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Nanometer cerium oxide hydrate-based arsenic removing material, preparation method thereof and application in arsenic removing

A cerium oxide and hydration technology, applied in the field of nano-hydrated cerium oxide-based adsorption materials and their preparation, can solve problems such as excessive arsenic in water, and achieve the effects of wide applicable pH range, stable performance and high adsorption capacity

Inactive Publication Date: 2012-07-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a simple and efficient nano-hydration cerium oxide-based arsenic-removing material and its preparation method and application for arsenic removal. The cerium-based arsenic-removing material has a simple preparation process and convenient operation, and can efficiently remove arsenic in water. Any pretreatment is required, which can effectively solve the current problem of excessive arsenic in water

Method used

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  • Nanometer cerium oxide hydrate-based arsenic removing material, preparation method thereof and application in arsenic removing
  • Nanometer cerium oxide hydrate-based arsenic removing material, preparation method thereof and application in arsenic removing
  • Nanometer cerium oxide hydrate-based arsenic removing material, preparation method thereof and application in arsenic removing

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Dissolve 2.17g of cerium nitrate hexahydrate in 200ml of absolute ethanol solution, add 0.8g of sodium hydroxide after stirring for 10 minutes, then stir for 20 minutes, the precipitate turns from dark brown to bright yellow. The obtained precipitate was washed to neutrality with secondary deionized water, then soaked in absolute ethanol, stirred to remove water, and then dried at 100° C. for 10 hours to obtain arsenic-removing nano-hydrated cerium oxide material. From figure 1 As can be seen from the shown XRD result, what the present invention makes is hydrated cerium oxide, and particle diameter is about 4nm, and figure 2 The high-resolution TEM results shown are consistent.

[0034] image 3 It is the nitrogen adsorption-desorption curve of the nano hydrated cerium oxide prepared by the present invention, and the specific surface area obtained by the test is 198m 2 / g.

[0035] The obtained nano-hydrated cerium oxide was used to make the arsenic adsorption isot...

Embodiment 2

[0038] Dissolve 2.17g of cerium nitrate hexahydrate in 200ml of absolute ethanol solution, add 0.8g of sodium hydroxide after stirring for 10 minutes, then stir for 20 minutes, the precipitate turns from dark brown to bright yellow. Wash the obtained precipitate with deionized water to neutrality, soak the precipitate in absolute ethanol, stir to remove water, and dry at 100° C. for 10 hours to obtain a cerium-based arsenic-removing material. The cerium-based arsenic-removing material was ultrasonically dispersed in 200 mL of deionized water, and the glass fiber cloth was soaked in it for about 1 minute, then taken out, and dried at 100°C for 3 hours to obtain the glass fiber cloth loaded with cerium oxide, and the obtained glass fiber cloth loaded with cerium oxide The cloth is impregnated several times to obtain the glass fiber cloth loaded with cerium oxide for many times. Weighing the glass fiber cloth before and after loading can calculate the loading capacity of the mate...

Embodiment 3

[0046] Soak activated alumina (spherical, diameter 3-5mm) in different concentrations of cerium nitrate aqueous solution (0.1M, 0.2M, 0.5M, 2M) for 5 hours, remove activated alumina and dry at 60°C for 12 hours, 450 ℃ for 1 hour to obtain activated alumina loaded with cerium oxide.

[0047] Table 2. Loading capacity and specific surface area of ​​activated alumina loaded with cerium oxide

[0048] al 2 o 3

0.1M

0.2M

0.5M

2M

load (%)

0

4.8

7.6

13.7

15.6

Specific surface area (m 2 / g)

231.7

215.4

210.8

180.8

146.7

[0049] The sample with 15.6% loading of cerium oxide in this example is used for dynamic penetration test, and the activated alumina loaded with cerium oxide is filled into a glass tube (Φ10×150cm), the flow rate is controlled at 2ml / min, and the initial arsenic The concentration is 60ppb. The effluent was collected at regular intervals, and the...

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Abstract

The invention belongs to the inorganic non-metal nanometer material preparation and the environmental friendliness field of water purification, in particular relates to a nanometer cerium oxide hydrate-based adsorbing material with a high specific surface area, a preparation method of the adsorbing material and application in removing arsenic. By using the nanometer cerium oxide hydrate-based adsorbing material, trivalent arsenic and pentavalent arsenic in the water can be removed at one step and the current problem that the content of arsenic in water exceeds the standard can be effectively solved. The cerium oxide hydrate-based adsorbing material is obtained by the steps of depositing a cerium salt (or a mixture of a cerium salt and other metal salt) by an alkali in water (or a non-aqueous solvent) and drying the product. The preparation method is simple in process; the obtained cerium oxide hydrate-based adsorbing material is large in specific surface area, strong in arsenic removing ability, wide in pH applicable range and stable in performance, and the arsenic pollution in a natural water area can be simply and efficiently removed by loading the adsorbing material with no need of pre-treatment, so as to provide a novel arsenic removing material for purification of arsenic-containing sewage and environment friendliness.

Description

technical field [0001] The invention belongs to the fields of preparation of inorganic non-metallic nanometer materials and environmental protection of water purification, and specifically relates to a nano-hydration cerium oxide-based adsorption material with high specific surface area, a preparation method thereof and an application in arsenic removal. Background technique [0002] Arsenic is widely distributed in the atmosphere, water, soil, rocks and organisms. In natural water bodies, dissolved arsenic generally exists in the form of inorganic arsenate, arsenite or methylated arsenic compounds. Currently, arsenic pollution has been found in surface water in many countries and regions. In my country's Inner Mongolia, Xinjiang, Taiwan and other places, the arsenic content in drinking water is as high as 0.2-2.0 mg / L in some areas. [0003] my country's drinking water standard GB5749-2006 stipulates that the mass concentration of arsenic should not exceed 10 ppb, and the ...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/08B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 李荣辉李琦高世安尚建库
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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