Aluminum modified straw biomass charcoal as well as preparation method and application thereof on removing arsenic in water body

A biomass carbon, aluminum modification technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as weak anion adsorption capacity

Inactive Publication Date: 2013-01-16
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of biochar is generally negatively charged, and has a high adsorption capacity for cations such as heavy metals, but its adsorption capacity for anions is weak.

Method used

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  • Aluminum modified straw biomass charcoal as well as preparation method and application thereof on removing arsenic in water body
  • Aluminum modified straw biomass charcoal as well as preparation method and application thereof on removing arsenic in water body
  • Aluminum modified straw biomass charcoal as well as preparation method and application thereof on removing arsenic in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Comparison of As(V) adsorption capacity and removal effect of biochar modified with different initial concentrations of aluminum solutions.

[0028] Biochar was prepared from air-dried soybean straw under anaerobic conditions of 350 °C. The specific steps are as follows: the soybean stalks are air-dried, ground and passed through a 1mm sieve. A ceramic crucible filled with soybean straw was placed in a muffle furnace, and the temperature was raised to 350°C at a rate of 20°C / min. After maintaining for 4 hours, the power was turned off, and the soybean straw charcoal was taken out after the temperature of the muffle furnace dropped to room temperature. Add 20 g of soybean straw charcoal to 200 mL of AlCl with an initial concentration of 0.3 mol / L under magnetic stirring conditions 3 In the solution, the pH was adjusted to 7.0 with 0.5 mol / L NaOH and maintained for 2 hours. Place in a constant temperature incubator at 25°C for 48 hours, then centrifuge, wash once with d...

Embodiment 2

[0032] Comparison of the adsorption capacity and removal effect of aluminum-modified peanut straw charcoal and rice straw charcoal on As(V).

[0033] According to the method in Example 1, the peanut straw charcoal and rice straw charcoal prepared at 350°C were reacted with 0.6 mol / L aluminum solution to prepare aluminum-modified biochar. Then according to the method in Example 1, the adsorption capacity and removal rate of Al-modified biochar to As(V) were studied. image 3 is the adsorption capacity of two kinds of aluminum-modified biochars for As(V). Similar to soybean straw charcoal modified with 0.6 mol / L aluminum solution, aluminum-modified rice straw charcoal and peanut straw charcoal also have high adsorption capacity for As(V), the maximum adsorption capacity can reach 655 and 627mmol / kg, respectively. Figure 4 is the removal rate of As(V) by two kinds of aluminum-modified straw biochars. When the initial concentrations of As(V) were 0.3, 0.4 and 0.5 mmol / L, the re...

Embodiment 3

[0036] Adsorption capacity of Al-modified biochar for As(V) at different pH.

[0037] Prepare an As(V) solution with an initial concentration of 0.8 mmol / L, adjust the pH of the solution to a range of 3.5 to 6.5 with HCl and NaOH, and then study the effect of aluminum-modified biochar on As(V) according to the method in Example 1. adsorption capacity. Figure 5 is the adsorption capacity of three kinds of Al-modified biochars for As(V) at different pH. The adsorption capacity of Al-modified biochar on As(V) decreased with the increase of system pH, but the Al-modified biochar had higher adsorption capacity on As(V) in the acidic range. Since the arsenic-containing wastewater produced by metal ore mining and smelting is mostly acidic and strongly acidic, this provides favorable conditions for the adsorption and removal of As(V) by aluminum-modified biochar. However, when the pH of the arsenic-containing wastewater is lower than 4.0, it is necessary to add an appropriate amoun...

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Abstract

The invention discloses aluminum modified straw biomass charcoal as well as a preparation method and an application thereof on removing arsenic in a water body. The straw biomass charcoal is formed by 350DEG C oxygen-controlled pyrolysis of peanut straws, soybean straws, rape straws, straws or other crop straws. The aluminum modified straw biomass charcoal is prepared by mixing and alkalifying straw biomass charcoal and 0.6mol/L of aluminum solution. A method for removing As (V) in the water body by the aluminum modified straw biomass charcoal comprises the following steps of: mixing the aluminum modified straw biomass charcoal with arsenic containing solution at the ratio of 1g/L in a reaction tank; continuously stirring for 2 hours; standing for 20 hours; stirring for 0.5 hours; after standing for 1.5 hours, separating the aluminum modified biomass charcoal from mixed liquor by a sand filtering device; discharging clear liquid; burning the biomass charcoal used for processing waste water after the biomass charcoal is subjected to air drying; and recovering ash contents and residues. The method is cheap and efficient and is free from secondary pollution.

Description

[0001] technical field [0002] The invention belongs to the technical field of purification and treatment of arsenic-containing wastewater, and relates to an aluminum-modified straw biomass charcoal, a preparation method thereof and an application for removing arsenic in water bodies. [0003] Background technique [0004] Arsenic is a highly toxic metalloid element with carcinogenicity and is listed as the first class of pollutants. Arsenic pollution mainly comes from industrial and agricultural production activities, such as semiconductor industry, metal mining and smelting, and arsenic-containing "three wastes" discharged from manufacturing industries that use arsenic as raw materials; arsenic-containing pesticides, disinfectants, and fungicides used in agricultural activities , herbicides and feed additives. Many countries have established strict control standards for arsenic content in drinking water. In the "Drinking Water Sanitation Standard" (GB5749-2006) promulg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58
Inventor 钱薇赵安珍徐仁扣
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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