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Method for preparing load type zero valent iron for water processing

A load-type, zero-valent iron technology, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, and other chemical processes, can solve difficult solid-liquid separation, decrease in degradation efficiency, and reduce the adsorption sites of nano-sized zero-valent iron particles and other issues to achieve the effect of cheap

Inactive Publication Date: 2012-11-07
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the effect of the surface energy of nano-zero-valent iron particles, it is easy to cause agglomeration, which reduces the adsorption points of nano-zero-valent iron particles, reduces the effective contact area with pollutants, and reduces the degradation efficiency; at the same time, dispersed nano-zero-valent iron particles Iron is difficult to separate from solid and liquid after treatment in wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The concentration is 0.8mol / L FeCl 3 The solution was stirred in a water bath at 65°C while Na was added dropwise to the solution 2 CO 3 solution such that OH - :Fe 3+ = 1.0 (molar ratio), after the dropwise addition, continue stirring under the same conditions at 65°C for 2.5 hours, and then age for 24 hours to obtain a hydroxy-iron pillar solution; take the above-mentioned hydroxy-iron pillar solution, add to it, dry and pulverize it for 150 For mineralized waste with a landfill age of 15 years, the amount of the above-mentioned hydroxyl iron pillaring solution required per gram of mineralized waste is 3 mL, stirred for 8 hours, aged for 24 hours, washed with distilled water for 5 times, and dried at 120 °C After 4 hours, the powder was obtained by grinding; the above powder was added to deionized water, and 15g of the above powder was added to every 100mL of deionized water. 2 Stir under protection, then add KBH with a concentration of 1mol / L 4 Add the solution ...

Embodiment 2

[0021] With a concentration of 0.4mol / L Fe(NO 3 ) 3 The solution was stirred in a water bath at 60 °C, and Na was added dropwise to the solution at the same time 2 CO 3 solution such that OH - :Fe 3+ =1:1.2 (molar ratio), after the dropwise addition, continue to stir for 2 hours under the same conditions at 60°C, and then age for 48 hours to obtain the hydroxyl iron pillar liquid; take the above hydroxyl iron pillar liquid, add dried and pulverized For mineralized waste with a landfill age of 8 years on a 60-mesh sieve, the amount of the above-mentioned hydroxyl iron pillaring liquid required for each gram of mineralized waste is 1 mL, stirred for 6 hours, aged for 48 hours, washed with distilled water for 3 times, at 105 °C Dry for 3 hours, and grind to obtain powder; take the above powder and add it to deionized water, add 10g of the above powder per 100mL of deionized water, and put it under N 2 Stir under protection, then add NaBH with a concentration of 0.5mol / L 4 T...

Embodiment 3

[0024] With a concentration of 0.5mol / L Fe(NO 3 ) 3 The solution was stirred in a water bath at 65°C while Na was added dropwise to the solution 2 CO 3 solution such that OH - :Fe 3+ = 1.0 (molar ratio), after the dropwise addition, continue stirring under the same conditions at 65°C for 2.5 hours, and then age for 24 hours to obtain a hydroxy-iron pillar solution; take the above-mentioned hydroxy-iron pillar solution, add to it, dry and pulverize it for 150 For mineralized waste with a landfill age of 10 years on the mesh screen, the amount of the above-mentioned hydroxyl iron pillar liquid required for each gram of mineralized waste is 3 mL, stirred for 8 hours, aged for 48 hours, washed with distilled water for 5 times, and dried at 120 °C After 4 hours, the powder was obtained by grinding; the above powder was added to deionized water, and 15g of the above powder was added to every 100mL of deionized water. 2 Stir under protection, and then add NaBH with a concentrati...

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Abstract

The invention provides a method for preparing load type zero valent iron for water processing. The method comprises the steps of 1), stirring a trivalence iron solution in a water bath, adding a weak base solution into the solution dropwise, enabling that OH-: Fe3+=(1:1)-(1:1.2), stirring continuously after addition, and aging to obtain a hydroxy iron pillar solution; 2), extracting the iron carbonyl column supporting liquid, adding dry ground mineralized garbage with landfill age of 8-15 years, stirring, aging, cleaning precipitates with water, drying and grinding to obtain powder; and 3), adding the powder into deionized water, under protective gases, stirring, a KBH4 solution or a NaBH4 solution is added into a stirred powder solution, and stirring continuously for 30-40 min; and 4), separating the solution, cleaning by using deoxidized deionized water, and under the protection of protective gases, drying at the constant temperature of 60-70 DEG C for 5-6 h to obtain the load type zero valent iron for waste water processing.

Description

technical field [0001] The invention relates to the field of new materials for environmental pollution control, in particular to a preparation method of loaded zero-valent iron for water treatment. Background technique [0002] Nanoscale zero-valent iron has shown superior performance in solving a series of environmental problems such as organic pollution, heavy metal pollution, and environmental pollution remediation. Nano zero-valent iron has strong reducing activity, unstable chemical properties and easy to be oxidized. However, due to the effect of the surface energy of nano-zero-valent iron particles, it is easy to cause agglomeration, which reduces the adsorption points of nano-zero-valent iron particles, reduces the effective contact area with pollutants, and reduces the degradation efficiency; at the same time, dispersed nano-zero-valent iron particles Iron is difficult to separate from solid and liquid after treatment in wastewater. Therefore, the development of n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 马建锋邹静李定龙姚超
Owner CHANGZHOU UNIV
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