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Modified biochar material for removing arsenic, and preparation and application thereof

A biochar and biomass raw material technology, applied in the field of arsenic pollution treatment, can solve the problems of rare earth element lanthanum, such as high cost, unsuitable for popularization and utilization, complicated preparation process, etc. The effect of simple process

Inactive Publication Date: 2017-02-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention uses nano-magnetite as one of the raw materials, which has high cost and complicated preparation process, which is not conducive to large-scale application.
Chinese patent application (publication number CN104815613A) discloses a preparation method and application of a lanthanum-loaded biochar arsenic-removing adsorbent, which is used to treat pentavalent arsenic ions in waste water, but the cost of rare earth element lanthanum is expensive, which is not suitable for practical promotion use

Method used

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  • Modified biochar material for removing arsenic, and preparation and application thereof
  • Modified biochar material for removing arsenic, and preparation and application thereof
  • Modified biochar material for removing arsenic, and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The red mud-based biochar material used for removing arsenic of the present embodiment is prepared by the following steps:

[0035] 1) Wash the rice straw to remove impurities, air-dry it, crush it, pass it through a 200-mesh sieve, and set it aside.

[0036] 2) Take a certain amount of red mud and add it to distilled water (the solid-to-liquid ratio of red mud and distilled water is 1:250g / mL), and apply ultrasonic waves for 1 hour to prepare a red mud suspension.

[0037] 3) Add the rice straw powder obtained in step 1) to the red mud suspension obtained in step 2), the mass ratio of rice straw to red mud is 5:1 (the red mud is calculated on a dry basis), stir well, and stir for 3 hours, Stand still and separate again, filter off the water.

[0038] 4) Put the product obtained in step 3) into a muffle furnace for anaerobic roasting, raise the temperature to 600°C at a heating rate of 5°C / min, keep at this temperature for 6h, cool to room temperature, and take out the...

Embodiment 2

[0065] This example is the effect of pH on the adsorption performance of unmodified biochar and red mud-based biochar on As(V) and As(III). The unmodified biochar and red mud-based biochar prepared in Example 1 were used.

[0066] Weigh 0.12g of unmodified biochar and red mud-based biochar into a 50mL centrifuge tube, then add 30mL of 10mg / L As(V) and As(III) solutions respectively, and use 0.1mol·L -1 Adjust the pH of the solution with HCl or NaOH to different pH values ​​(2, 4, 6, 8, 10, 12), and place it in a constant temperature air shaker at room temperature (25±1°C) at a speed of 200rpm / min Shake for 24h. After the shaking was completed, it was filtered, and the concentration of arsenic in the filtrate was determined by atomic fluorescence.

[0067] Depend on Figure 4 .a It can be seen that when pH=2, red mud-based biochar adsorbs As(V) to the maximum adsorption capacity, and the adsorption capacity is 1622.51 μg·g -1 . When pH=6, the unmodified biochar adsorbed As...

Embodiment 3

[0069] This example is a fitting curve of kinetic adsorption of unmodified biochar and red mud-based biochar on As(V) and As(III). The unmodified biochar and red mud-based biochar prepared in Example 1 were used.

[0070] Weigh 0.12g of unmodified biochar and red mud-based biochar into a 50mL centrifuge tube, then add 30mL of 10mg / L As(V) and As(III) solutions respectively, and use 0.1mol·L -1 HCl or NaOH adjusted the optimal adsorption pH. Place in a constant temperature air shaker, and shake for different times (0.5, 1, 2, 4, 8, 12, 16 and 24h) at room temperature (25±1°C) at a speed of 200rpm / min. After the shaking was completed, it was filtered, and the concentration of arsenic in the filtrate was determined by atomic fluorescence.

[0071] Depend on Figure 5 It can be seen that the adsorption of As(V) and As(III) by unmodified biochar and red mud-based biochar reached equilibrium within 24 hours. Using pseudo-first-order and pseudo-second-order kinetics and Elovich m...

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Abstract

The invention relates to a modified biochar material for removing arsenic, and preparation and application thereof. The preparation method comprises the following steps: adding biomass raw material powder into an ultrasonically-dispersed suspension of red mud and water, stirring the suspension to mix uniformly, and performing solid-liquid separation; roasting a obtained mixture of biomass and the red mud in a non-oxidizing atmosphere at the roasting temperature of 550 to 650 DEG C to obtain a carbonized product, namely, the modified biochar material. The modified biochar material is wide in raw material source, is convenient to prepare, has relatively high adsorption performance for arsenic-containing wastewater, is easy for large-scale production, and has a good application prospect.

Description

technical field [0001] The invention relates to arsenic pollution treatment technology, in particular to a modified biochar material for arsenic removal, its preparation and application. Background technique [0002] Arsenic (As) is a "carcinogenic" metalloid element, which has an important impact on human health. In recent years, incidents of arsenic pollution and arsenic poisoning in water bodies in some areas of my country have been frequently reported. At present, the arsenic removal methods at home and abroad mainly include: adsorption, ion exchange, electrocoagulation, membrane treatment, reverse osmosis and biological methods. Among them, the adsorption method is currently relatively mature, simple, and widely used in the treatment of arsenic pollution in water environment. The adsorption method is to use solid materials with large specific surface area and porous structure to fix arsenic pollutants in water by physical adsorption, chemical adsorption and ion exchan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/20B01J20/041B01J2220/4825C02F1/281C02F2101/20
Inventor 吴川薛生国黄柳史力争崔梦倩
Owner CENT SOUTH UNIV
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