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Ultrafine arsenic removal adsorbent and preparation method thereof, and arsenic removal method

A technology of adsorbent and surfactant, which is applied in the field of ultrafine arsenic removal adsorbent and its preparation, can solve the problems of difficult arsenic removal, low arsenic content, etc., and achieve increased arsenic removal effect, high specific surface area, and reaction The effect of increased active sites

Active Publication Date: 2020-05-01
安徽海螺材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]However, the arsenic content in domestic water is low, and it is more difficult to remove arsenic than in industrial wastewater

Method used

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  • Ultrafine arsenic removal adsorbent and preparation method thereof, and arsenic removal method
  • Ultrafine arsenic removal adsorbent and preparation method thereof, and arsenic removal method
  • Ultrafine arsenic removal adsorbent and preparation method thereof, and arsenic removal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method of an ultrafine arsenic-removing adsorbent, comprising the following steps:

[0046] 1) take by weighing the calcium chloride of 2.22g, the sodium metaaluminate of 0.55g, 0.47g sodium sulfate (Ca 2+ :Al 3+ :SO 4 2- The molar ratio is 6:2:1), the three raw materials were dissolved in 200ml deionized water respectively, and then the obtained three solutions were mixed, and 5% of the total mass of the raw materials (calcium chloride, sodium metaaluminate and sodium sulfate) was added EDTA disodium, using NaOH solution to adjust the pH value of the mixed solution to 11.5;

[0047] 2) Seal the solution prepared in step 1), heat and adjust the temperature to 90°C, and stir magnetically under this condition for 12 hours, then filter the synthesized suspension solution and wash the precipitate until neutral, vacuum-dry at 50°C for 24 hours, and store in a sealed container. Standby, denoted as AFm-1, the scanning electron microscope appearance is as foll...

Embodiment 2

[0049] A preparation method of an ultrafine arsenic-removing adsorbent, comprising the following steps:

[0050] 1) Weigh 3.33g of calcium chloride, 0.83g of sodium metaaluminate, and 0.71g of sodium sulfate, dissolve the three kinds of raw materials in 200ml of deionized water respectively, then mix the obtained three kinds of solutions, add the total amount of raw materials 5 % of disodium edetate, using NaOH solution to adjust the pH value of the mixed solution to 11.5;

[0051] 2) Seal the solution prepared in step 1), seal it, heat and adjust the temperature to 90°C, and stir it magnetically for 12 hours under this condition, then filter the synthesized suspension solution and wash the precipitate to neutrality, vacuum-dry it at 50°C for 24 hours, and seal it Storage, standby, recorded as AFm-2, scanning electron microscope appearance as figure 2 shown.

Embodiment 3

[0053] A preparation method of an ultrafine arsenic-removing adsorbent, comprising the following steps:

[0054] 1) Weigh 3.33g of calcium chloride, 0.825g of sodium metaaluminate, and 0.71g of sodium sulfate, dissolve the three kinds of raw materials in 200ml of deionized water respectively, then mix the obtained three kinds of solutions, add the total amount of raw materials 5 % of disodium edetate, use the configured NaOH solution to adjust the pH value of the mixed solution to 11.5;

[0055] 2) Seal the solution prepared in step 1), seal it, heat it to adjust the temperature to 90°C, and stir it magnetically for 24 hours under this condition, then filter and wash the synthesized suspension solution until it is neutral, vacuum-dry it at 50°C for 24 hours, and store it sealed , spare, denoted as AFm-3, scanning electron microscope appearance as image 3 shown.

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Abstract

The invention provides an ultrafine arsenic removal adsorbent and a preparation method thereof, and an arsenic removal method. The preparation method comprises: adding a surfactant into a solution containing Ca<2+>, Al<3+> and SO4<2->, then adjusting the pH to 10.6-12.9; and carrying out a heating stirring reaction, filtering, washing, and drying to obtain the ultrafine arsenic removal adsorbent.The ultrafine arsenic removal adsorbent prepared by the invention is monosulfur hydrated calcium sulphoaluminate (AFm), has a chemical formula of 3CaO.Al2O3.CaSO4.nH2O, belongs to a trigonal system, and is of a layered structure. Compared with the arsenic removal adsorbent in the prior art, the arsenic removal adsorbent of the invention has the following characteristics that the raw materials areeasy to obtain, the coat is low, arsenic ions in domestic water are adsorbed through solid, a solidified product formed after adsorption removal is still solid and is easy to separate, and the arsenicremoval adsorbent is environmentally friendly and free of secondary pollution. The prepared ultrafine arsenic removal adsorbent is solid, is convenient to transport, convenient to use and easy to popularize, and can be used in daily life of residents.

Description

technical field [0001] The invention belongs to the field of arsenic adsorption, and in particular relates to an ultrafine adsorbent for removing arsenic, a preparation method thereof, and a method for removing arsenic. Background technique [0002] With the rapid development of industry and agriculture, the situation of environmental pollution caused by arsenic has become more and more serious. There have been many reports on arsenic pollution in water bodies. Arsenic (As) is a highly toxic substance that is extremely harmful to the human body. [0003] The inorganic form of arsenic in natural waters is dominant, and the main forms are arsenite (As(III)) and arsenate (As(V)), rarely in the form of elemental arsenic, while As(V ) mainly exists in the form of arsenate. [0004] Many methods have been used to deal with arsenate pollution in water, including chemical precipitation, ion exchange, membrane separation, electrochemical and adsorption. The chemical precipitation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/28B01J20/30C01F7/76C02F1/28C02F101/10
CPCB01J20/08C01F7/767B01J20/2804B01J20/28057C02F1/281C01P2002/60C01P2002/22C02F2101/103Y02P10/20
Inventor 曹卫华许庚友宋南京曾君司宏振姚杰黄传良陶超超张磊姜标刘修青李明洋
Owner 安徽海螺材料科技股份有限公司
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