Composite absorption material for removing arsenic from water and its prepn. method

A composite adsorption material and water removal technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve the effects of simple process, improved adsorption and arsenic removal efficiency, and high mechanical strength

Active Publication Date: 2006-03-29
SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there is no arsenic-removing adsorbent that can meet the above-mentioned requirements at the same time.

Method used

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  • Composite absorption material for removing arsenic from water and its prepn. method
  • Composite absorption material for removing arsenic from water and its prepn. method
  • Composite absorption material for removing arsenic from water and its prepn. method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for preparing composite adsorbent material (iron oxide / activated carbon) of the present invention is as follows:

[0024] The first step: activated carbon pretreatment, select the coal-based steam activation method activated carbon produced in Datong, the specification is 12X40, weigh two parts of activated carbon (one of which is used as a comparison), and put 20g of each part in two beakers, add to The ionized water was repeatedly washed three times, and the activated carbon after the water washing was put into a drying oven for drying (preserved at 90° C. for 24 hours) for use.

[0025] The second step: Activated carbon surface treatment, add one of the activated carbons treated in the first step to 1N100ml nitric acid (HNO 3 ) solution, stirred evenly, stood for 4 hours, washed three times with deionized water, and dried at 95-100°C for 24 hours before use.

[0026] The third step: preparation of iron oxide suspension, 7.2g of FeSO 4 ·7H 2 O and 9.8 g ...

Embodiment 2

[0029] The first step and the second step of preparing the composite adsorbent material of the present invention are the same as in Example 1.

[0030] The third step: the preparation of iron oxide suspension, 36g of FeSO 4 ·7H 2 O and 65g FeCl 3 ·6H 2 O is mixed and added to 80ml of water and heated to 60-70°C to completely dissolve, then add 80ml of NaOH with a concentration of 5mol / l, and stir rapidly to form iron oxide precipitate at a constant temperature of 70°C. Titrate with NaOH until the solution is basic (pH=9-11). Wash it with water to remove remaining salts. In order to prevent the flocculation and deposition of the product, effectively inhibit the growth of particles, and obtain fine particles with uniform distribution, add 1.6g of surfactant lauric acid, and add 6 drops of 5mol / l NaOH solution to increase its solubility. Stir for 10 minutes (min), put it into a container and heat to 90°C, and keep the temperature constant for 30min. Add HCl to adjust the pH...

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Abstract

A composite adsorption material for removing As from water is prepared from activated carbon and iron oxide through washing activated carbon by water, heating, drying, adding it to nitric acid, stirring, laying aside, water washing, drying, dissolving FeSO4*7H2O in water, adding it to NaOH solution, stirring to generate iron oxide deposit, using NaOH to regulate pH=9-10, water washing, adding lauric acid, dripping NaOH while stirring, heating to make pH=4-5, mixing said activated carbon with the suspension of iron oxide, and stirring. It has high capacity, selectivity, adsorptivity and mechanical strength.

Description

technical field [0001] The invention relates to an adsorbent for removing arsenic, in particular to a composite adsorbent material capable of effectively removing arsenic in water. The present invention further relates to the preparation method of this composite adsorption material. Background technique [0002] In 1993, the World Health Organization announced that the content of arsenic in drinking water ranged from 7-10ppb in consideration of human health. According to the "Drinking Water Hygienic Standards" promulgated and implemented in 1986, the arsenic content should not exceed 50ppb. However, in the groundwater in the middle and lower reaches of the Yangtze River in my country, the content of arsenic, iron and manganese is often high, and some even exceed the standard obviously. Therefore, the problem of treating high-arsenic drinking water to reduce its content is of great practical significance. The traditional way of removing arsenic in w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28
Inventor 张巧丽高乃云乐林生徐斌戴婕陈明吉
Owner SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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