Method for preparing load type nano arsenic-removing sorbent for drinking water

A nano-adsorption and drinking water technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of increasing costs, achieve low cost, good application prospects, and overcome high loss rates.

Inactive Publication Date: 2009-01-21
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some adsorbents are mixed with rare elements or transition elements to improve the adsorption performance, which not only increases the cost, but also the health risks of rare elements and transition elements need to be further evaluated

Method used

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  • Method for preparing load type nano arsenic-removing sorbent for drinking water
  • Method for preparing load type nano arsenic-removing sorbent for drinking water
  • Method for preparing load type nano arsenic-removing sorbent for drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The selected materials are: choose different matrix activated carbon: coconut shell carbon (pore volume is 0.326cm 3 / g), coal-based carbon (pore volume is 0.145cm 3 / g), bone charcoal (pore volume is 0.250cm 3 / g); ferric chloride, potassium borohydride, organic solvents (common), monoalcohols (C 1 -C 10 ), low-carbon polyol series (C 1 -C 10 ), polyethylene glycol series (200-40000), anaerobic water, inert gas (common), etc.

[0033] The specific steps are:

[0034] (1) select commercially available coconut shell charcoal (the pore volume is 0.326cm 3 / g), coal-based carbon (pore volume is 0.145cm 3 / g), bone charcoal (pore volume is 0.250cm 3 / g) and other activated carbon materials, washed 3 times with deionized water, and then ultrasonically treated for 30min;

[0035] (2) At room temperature, in a 250ml three-neck flask equipped with a magnetic stirrer, activated carbon, and a dropping funnel, add 30 ml of 0.15M ferric chloride solution (coconut shell cha...

Embodiment 2

[0041] The selected material is: activated carbon (obtained from coal-based carbon treatment, the pore volume is 0.168cm 3 / g), ferrous sulfate, potassium borohydride, organic solvent (common), ethanol, glycerin, polyethylene glycol 200, polyethylene glycol 4000, anaerobic water, inert gas (common), etc.

[0042] The specific steps are:

[0043] (1) Select the pore volume as 0.168cm 3 / g of commercially available coal-based activated carbon, washed 3 times with deionized water, and then sonicated for 30 min;

[0044](2) At room temperature, in a 250ml there-necked flask equipped with a magnetic stirrer, gac, and dropping funnel, add 30 milliliters of 0.2M ferrous sulfate solution (soak the coal-based charcoal in advance for 60 minutes with ferrous sulfate), Then 45 ml of dispersant (ratio 1 of ethanol, glycerol, polyethylene glycol 200 and 4000 is 1:1:1, ratio 2 is 2:2:0.5, ratio 3 is 2:1:0.1) is added.

[0045] (3) Under the protection of inert gas (flow rate 60 ml / min), p...

Embodiment 3

[0050] The selected material is: activated carbon (obtained from coal-based carbon treatment, the pore volume is 0.214cm 3 / g), iron salt (ferric chloride, ferrous sulfate, ferric sulfate), potassium borohydride, organic solvent (common), ethanol, glycerin, polyethylene glycol series 200, anaerobic water, inert gas (common )Wait.

[0051] The specific steps are:

[0052] (1) Select the pore volume as 0.214cm 3 / g of commercially available coal-based activated carbon, washed 3 times with deionized water, and then sonicated for 30 min;

[0053] (2) At room temperature, in a 250ml three-neck flask equipped with a magnetic stirrer, activated carbon, and dropping funnel, add 0.1M ferric chloride, ferric sulfate, and ferrous sulfate solution 30ml iron salt for 60 minutes), and then add 60 milliliters of dispersant (ethanol, glycerin, polyethylene glycol 4000 ratio 2:1:0.1).

[0054] (3) Under the protection of nitrogen gas (flow rate 60 ml / min), potassium borohydride solution wa...

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Abstract

The invention relates to the elimination of the arsenic in drinking water, in particular to a preparation method of a supported type nano-adsorbent for removing arsenic from drinking water; the method includes the following steps: (1) activated carbon material with pore volume of 0.100-0.500cm<3> / g is selected for pretreatment; (2) soluble ferric salt solution is firstly used for soaking the activated carbon for 10-120 min; (3) alcoholic solution is taken as a dispersant to be added into the ferric salt solution; (4) under the protection of inert gases at room temperature, a strong reductant, potassium borohydride or sodium borohydride, is used for titrating the ferric salt, and agitation is carried out under the protection of inert gases; after the titration of potassium borohydride or sodium borohydride solution, agitation lasts for 10-120 min; (5) after agitation, centrifugation is carried out; oxygen-free water is firstly used for washing for 1-3 times, then organic solvent is adopted for washing for 1-3 times, and vacuum drying is done at 40-100 DEG C for 12-48h to obtain the product. The adsorbent of the invention has large adsorption capacity and small volume and is safe, stable and easy to store and transport.

Description

technical field [0001] The invention relates to the removal of arsenic in drinking water, in particular to a preparation method of a loaded drinking water arsenic-removing nano-adsorbent. Background technique [0002] Arsenic is one of the highly toxic elements. In recent years, the pollution of arsenic in groundwater has aroused widespread concern. The content of arsenic in the groundwater of Taiwan, Xinjiang and Inner Mongolia in my country seriously exceeds the standard, and the arsenic content can reach up to 2000 μg L -1 ; Internationally, countries with serious arsenic pollution in groundwater include India, Bangladesh, Vietnam, Argentina, Chile, Mexico, and Hungary. Long-term arsenic exposure can cause cancer of the skin, lungs, liver, kidneys and bladder. The World Health Organization revised the maximum allowable concentration of arsenic in drinking water in 1993 and determined it to be 10 μg L -1 . The European Union and the United States have re-established th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/32C02F1/28
Inventor 贾永锋朱慧杰
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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