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Schwertmannite for removing pollution of As (III) and Cr (VI)

A technology of Shishi's minerals and hexavalent chromium, which is applied in the field of pollution control, can solve the problems of strong mobility, high toxicity, difficult adsorption and removal, etc., and achieves the effects of convenient operation, low production cost and good removal effect.

Active Publication Date: 2020-01-21
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Arsenic exists mainly in two forms of As(III) and As(V) in natural water. The former is 60 times more toxic than the latter, and has strong mobility and is not easily removed by adsorbents.

Method used

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  • Schwertmannite for removing pollution of As (III) and Cr (VI)
  • Schwertmannite for removing pollution of As (III) and Cr (VI)
  • Schwertmannite for removing pollution of As (III) and Cr (VI)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Heat 1 L of deionized water to 60 °C, then add 5.4 g of FeCl 3 ·6H 2 O and 1.5g Na 2 SO 4 , heat the mixed solution at 60°C for 12 minutes, cool the precipitate obtained after the reaction to room temperature, transfer it to a dialysis bag, and dialyze it for 7 days until the conductivity is lower than 100 μs cm -1 , Centrifugal drying that is Shi's minerals.

Embodiment 2

[0021] Heat 1 L of deionized water to 50 °C, then add 3 g of FeCl 3 ·6H 2 O and 2g Na 2 SO 4 , heat the mixed solution at 50°C for 12 minutes, cool the precipitate obtained after the reaction to room temperature, transfer it to a dialysis bag, and dialyze it for 7 days until the conductivity is lower than 100 μs cm -1 , Centrifugal drying that is Shi's minerals.

Embodiment 3

[0023] Heat 1 L of deionized water to 70 °C, then add 7 g of FeCl 3 ·6H 2 O and 1g Na 2 SO 4 , heat the mixed solution at 70°C for 12 minutes, cool the precipitate obtained after the reaction to room temperature, transfer it to a dialysis bag, and dialyze it for 7 days until the conductivity is lower than 100 μs cm -1 , Centrifugal drying that is Shi's minerals.

[0024] Phase identification: The obtained mineral XRD pattern is as follows figure 1 As shown, the characteristic peaks in the figure are the same as the mineral characteristic peaks reported in the past, and it is determined to be Shi's mineral, and its specific surface area is determined to be 185m 2 g -1 (Table 1). Scanning electron microscope picture as figure 2 As shown, the prepared Shi's mineral is an agglomerated sphere structure with needle-like protrusions on the surface, and the shape is similar to sea urchin.

[0025] Table 1 is the chemical composition and specific surface area of ​​Shi's minera...

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Abstract

The invention discloses Schwertmannite for simultaneously removing pollution of As (III) and Cr (VI). The preparation method comprises the following steps: heating deionized water to 50-70 DEG C; thenadding FeCl3.6H2O and Na2SO4 and stirring the mixture to uniformity; then performing heat preservation and stirring on mixed solution for 5-20 min, cooling a precipitate formed in the reaction to theroom temperature and then transferring the precipitate into a dialysis bag; and dialyzing the precipitate for 5-10 days until the conductivity is lower than 100 [mu]s / cm, and performing centrifugal drying to prepare the powder with the specific surface area being 100-300 m<2> / g. The Schwertmannite has a good removal effect on arsenic and chromium in an As (III) and Cr (VI) binary pollutant coexistence system, and the removal shows a redox-adsorption combined effect, so that the toxicity of two pollution elements can be further reduced while the concentrations of arsenic and chromium in a water body are reduced.

Description

technical field [0001] The invention belongs to the field of pollution control, and in particular relates to a Shi's mineral used for removing pollution of trivalent arsenic and hexavalent chromium, and also relates to a method for removing pollution of trivalent arsenic and hexavalent chromium in water bodies. [0002] technical background [0003] With the rapid development of industrial technology, heavy metal pollution caused by industrial waste water, pesticides and medical waste has gradually become a global environmental problem. Among them, the heavy metal arsenic is one of the elements that are extremely harmful to the human body, and it cannot be degraded, and it is easy to accumulate continuously through the food chain and geochemical cycle, posing a great threat to the ecosystem. Arsenic exists in natural water mainly in two forms, As(III) and As(V). The former is 60 times more toxic than the latter, and has strong mobility, which is not easily removed by adsorben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/70C02F1/72C02F101/10C02F101/22
CPCC02F1/281C02F1/70C02F1/72C02F2101/103C02F2101/22
Inventor 王小明应虹黄坤冯雄汉严玉鹏刘凡
Owner HUAZHONG AGRI UNIV
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