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A kind of straw activated carbon adsorbent and application thereof modified by iron and manganese for as(Ⅲ) adsorption

A straw activated carbon and adsorbent technology, which is applied in the direction of adsorption of water/sewage treatment, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of unusable arsenic-containing waste residue, difficult treatment, secondary pollution, etc., and achieve The effect of rich raw materials, simple operation method and short processing cycle

Active Publication Date: 2018-01-02
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coagulation method requires a large amount of coagulant, and produces a large amount of arsenic-containing waste residue that cannot be used, and is difficult to handle. Long-term accumulation will easily cause secondary pollution. Therefore, this method is subject to certain restrictions in practical application.

Method used

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  • A kind of straw activated carbon adsorbent and application thereof modified by iron and manganese for as(Ⅲ) adsorption
  • A kind of straw activated carbon adsorbent and application thereof modified by iron and manganese for as(Ⅲ) adsorption
  • A kind of straw activated carbon adsorbent and application thereof modified by iron and manganese for as(Ⅲ) adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 A Fe-Mn-modified straw activated carbon adsorbent (Fe-Mn-Ac) for As(Ⅲ) adsorption

[0031] (1) The preparation method is as follows

[0032] 1) Preparation of straw activated carbon (Ac): Grind the straw into powder, put it into a tube furnace, raise the temperature to 350 °C at a rate of 10 °C / min, keep it in the tube furnace for 2 hours, cool down to room temperature, and take out , add 0.5mol·L according to the ratio of solid to liquid 1:3 -1 KOH, stirred for 30min, then dried in a vacuum drying oven at 80°C for 2.5h; then put it into a tube furnace, heated to 800°C at a speed of 15°C / min, in the tube furnace Keep it for 1h, cool down to room temperature, take it out, add 30ml of 5% HCl and stir for 30min, wash with water until neutral, filter, and dry at 50°C in a drying oven to obtain straw activated carbon (Ac).

[0033] 2) Acidification of straw activated carbon: add 2 g of straw activated carbon (Ac) to 100 mL of 68% nitric acid, react at room temper...

Embodiment 2

[0043] Example 2 Comparison of the adsorption performance of Fe-Mn-Ac adsorbent and Fe-Ac adsorbent on As(Ⅲ)

[0044] (1) React 10 mg of Fe-Mn-Ac adsorbent with 10 mL of a solution of 20 ppm As(Ⅲ) at different pH (pH=3, 4, 6, 8, 9, 10, 11, 12); Shake at 180r / min in a shaking box at 30°C for 24h.

[0045] (2) Comparative test

[0046] 10 mg of adsorbent Fe-Ac was reacted with 10 mL of 20 ppm As(III) solution at different pH (pH=3, 4, 6, 8, 9, 10, 11, 12). Shake it at 180r / min in a shaking box at 30°C for 24h.

[0047] The adsorption rate was measured as Figure 4 ,Depend on Figure 4 It can be seen that the comparison of Fe-Mn-Ac adsorbent with Fe-Ac adsorbent shows that Fe-Mn-Ac adsorbent has a maximum adsorption rate of 85% for As(Ⅲ) at pH=3, while Fe- When Ac is at pH=9, the maximum adsorption rate of As(Ⅲ) is only 57%. Therefore, Fe-Mn-Ac adsorbent can be used to extract As(Ⅲ) in As(Ⅲ) waste liquid under the condition of pH=3.

Embodiment 3

[0048] Example 3 Application of Fe-Mn Modified Activated Carbon Adsorbent to the Separation and Enrichment of As(Ⅲ)

[0049] Take 200ppm As(Ⅲ) solution, adjust the pH of the solution to pH=3, add 200 mg of Fe-Mn-Ac adsorbent to 200 mL of As(Ⅲ) solution, shake for 24 hours, and remove As(Ⅲ) in the solution Adsorption, after filtration, the adsorbent loaded with As(Ⅲ) was eluted with 0.05% NaOH solution, and the calculated recovery rate was 98%.

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Abstract

The invention relates to an iron-manganese modified straw activated carbon adsorbent used for As(III) adsorption and application thereof. The technical scheme adopted is: making straw activated carbon into straw, adding it to nitric acid for acidification treatment to obtain acidified straw activated carbon, adding the acidified straw activated carbon into the mixed solution of metal iron salt and HCl, and reacting at room temperature for 22‑24 hours , heated to 95-105°C, reacted for 6-7h to obtain iron-modified activated carbon; mixed metal manganese salt with iron-modified activated carbon, reacted at 75-85°C, and then added the mixed aqueous solution of KMnO4 and KOH, 75-85 The reaction was refluxed at ℃, and the product was washed to obtain the target product. The straw activated carbon adsorbent modified by iron and manganese of the present invention can selectively recover As(Ⅲ) from a solution containing As(Ⅲ) ions and impurity metal ions, and has the advantages of low cost, high selectivity, and large adsorption capacity. .

Description

technical field [0001] The invention belongs to the technical field of effective extraction of As(Ⅲ) and preparation of green adsorbent, in particular to a straw activated carbon adsorbent modified by iron and manganese, which can be selectively extracted from a solution containing As(Ⅲ) ions and impurity metal ions As(III) is recovered. Background technique [0002] Arsenic is a toxic element, and its compounds are trivalent and pentavalent, and trivalent arsenic is more toxic. The lethal dose of pentavalent arsenic to rats and mice is 100 mg / kg, while that of trivalent arsenic is 10 mg / kg, a difference of 10 times. Both natural groundwater and surface water may contain arsenic. In addition to originating from the earth's crust, arsenic pollution also comes from pesticide factories, glass factories and mine drainage. The content of arsenic in groundwater is higher than that in surface water. Arsenic can enter the human body through the respiratory tract, food or skin cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 熊英佟强张鹏单炜军娄振宁
Owner LIAONING UNIVERSITY
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