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Method for loading nanoscale zero-valent iron on surface of quartz sand

A nano-zero-valent iron, surface-loaded technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve problems such as unfavorable electrolyte adsorption, low charge density, weak free radicals, etc., and achieve low cost. , strong permeability, the effect of improving the charge density

Inactive Publication Date: 2016-05-11
WUXI HUANCHUANG ENVIRONMENT TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ability to decompose hydrogen peroxide to generate free radicals under alkaline conditions is very weak. For some carriers, the surface charge density is low after the surface is treated in this way, which is not conducive to the subsequent adsorption of electrolytes.

Method used

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  • Method for loading nanoscale zero-valent iron on surface of quartz sand
  • Method for loading nanoscale zero-valent iron on surface of quartz sand
  • Method for loading nanoscale zero-valent iron on surface of quartz sand

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Embodiment 1

[0035] Preparation of zero valent iron

[0036] 1) Prepare pH 2, 20g / L Na in advance 2 S 2 o 8 solution and pH 12, 20g / L Na 2 S 2 o 8 solution.

[0037] 2) Prepare PAA and PAH solutions with a concentration of 1g / L and 0.1mol / L FeSO 4 solution, and adjust the pH to 3.0 with 0.1 mol / L HCl and NaOH solution.

[0038]3) Preheat the ultrasonic machine to 70°C, weigh 200-mesh quartz sand and immerse it in pH 2, 20g / L Na 2 S 2 o 8 Solution, ultrasonic at 70°C for 10 minutes, pour out the waste liquid after taking it out, wash with water 3 times, 2 minutes each time.

[0039] 4) Immerse in pH12, 20g / L Na 2 S 2 o 8 Solution, ultrasonic at 70°C for 10 minutes, pour out the waste liquid after taking it out, wash with water 3 times, 2 minutes each time.

[0040] 5) Soak in 1g / LPAH for 5min, wash with water 3 times, 2min each time.

[0041] 6) Soak in 1g / LPAA for 5min, wash with water 3 times, 2min each time.

[0042] 7) Repeat steps 4 and 5 above for m times (m=3, 6, 9, 1...

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Abstract

The invention discloses a method for loading nanoscale zero-valent iron on the surface of quartz sand. The method comprises the steps of carrier pretreatment, electrolyte membrane assembling, ferrous ion uploading and reducing. The carrier pretreatment process particularly comprises the following steps that the quartz sand is weighed and immersed into a 15-30 g / L sodium persulfate solution with the pH ranging from 2 to 3, ultrasonic treatment is conducted at 60-70 DEG C, the treated quartz sand is cleaned with deionized water and then immersed into a 15-30 g / L sodium persulfate solution with the pH ranging from 12 to 13, ultrasonic treatment is conducted at 60-70 DEG C, and the treated quartz sand is cleaned with deionized water. According to the method for loading the nanoscale zero-valent iron on the surface of the quartz sand, the loading capacity and the particle size of the nanoscale zero-valent iron can be controlled, the reaction activity of the zero-valent iron can be effectively enhanced, and the method is suitable for restoration of groundwater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, relates to groundwater pollution restoration, in particular to a method for loading nanometer zero-valent iron on the surface of quartz sand. Background technique [0002] Zero-valent iron (ZVI) has strong reducibility and can be used to degrade organic chlorine solvents, polychlorinated biphenyls, etc., and has a wide range of applications in the field of groundwater remediation. Nano-zero-valent iron (NZVI) refers to zero-valent iron particles with a particle size in the range of 1-100nm, which is characterized by a large specific surface area. According to calculations, the specific surface area of ​​nano-iron is 40m 2 / g, while ordinary iron powder is only 0.9m 2 / g. Due to the surface effect of nanomaterials, the number of active centers increases with the increase of surface area, so nano-iron exhibits stronger reducibility [5], which has unique advantages and broad application pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/70
Inventor 陆隽鹤孔德洋宦志荣
Owner WUXI HUANCHUANG ENVIRONMENT TECH DEV
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