Method for efficiently reducing and removing pollutants based on boronized zero-valent iron

A zero-valent iron, boric acid technology, applied in the field of environmental chemistry, to achieve the effect of good reduction and removal capacity, low price, and low consumption of boric acid

Pending Publication Date: 2019-12-24
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to improve the activity of removing pollutants by changing the su

Method used

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  • Method for efficiently reducing and removing pollutants based on boronized zero-valent iron
  • Method for efficiently reducing and removing pollutants based on boronized zero-valent iron
  • Method for efficiently reducing and removing pollutants based on boronized zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 ball milling preparation of borated zero-valent iron and effect diagram of hexavalent chromium in the treatment of polluted water;

[0032] Put 5.6g of zero-valent iron (150 μm in particle size) and a certain amount of boric acid into a ball mill jar, the rotating speed is 550r / min, and the ball milling time is 2h, after which the sample is washed with alcohol and vacuum-dried to obtain borated zero-valent iron x%B- ZVI (x% is the molar ratio of boric acid to zero-valent iron). Use 30mL of hexavalent chromium solution with a concentration of 2mg / L to simulate chromium wastewater, the pH of the solution is 7, and the temperature is 25°C, add 0.1g of B-ZVI sample, put it in a shaker with a rotation speed of 100r / min, and regularly test the hexavalent chromium in the solution. Chromium concentration, see results image 3 . The ability of borated zero-valent iron to remove hexavalent chromium is stronger than that of non-borated zero-valent iron, and the removal...

Embodiment 2

[0033] Embodiment 2 Ball milling prepares borated zero-valent iron and controls nickel effect diagram in polluted water;

[0034] Put 5.6g (particle size: 80μm) of zero-valent iron and 0.250g of boric acid into a ball mill jar at a speed of 200r / min and a ball milling time of 10h to obtain borated zero-valent iron 4.0% B-ZVI. Simulate nickel wastewater with a nickel concentration of 10mg / L and a volume of 100mL. The pH of the solution is 4 and the temperature is 50°C. Add 0.5g of B-ZVI sample, put it in a shaker with a rotation speed of 200r / min, and measure the nickel in the solution by spectrophotometry. concentration, the result is as Figure 4 . The non-borated zero-valent iron only removed 60% within 90 minutes, while the borated zero-valent iron almost removed nickel within 40 minutes, so the borated zero-valent iron can improve the removal of nickel.

Embodiment 3

[0035] Example 3 ball milling preparation of borated zero-valent iron and control effect diagram of lead in polluted water;

[0036] Put 5.6g (particle size: 150μm) of zero-valent iron and 0.5g of boric acid (the molar ratio of boric acid to zero-valent iron is 8.0%) into the ball mill jar, the rotating speed is 800r / min, and the ball milling time is 4h to obtain borated zero Valence Iron 8.0% B-ZVI. Concentration is 5mg / L volume is 50mL lead waste water, solution pH is 10, temperature is 10 ℃, add B-ZVI sample 0.2g, put into the shaker that rotating speed is 250r / min, the lead concentration in the solution is measured by atomic adsorption method, the result Such as Figure 5 . Non-borated zero-valent iron only removed 20% of lead within 90 minutes, while borated zero-valent iron removed lead within 30 minutes, so borated zero-valent iron can improve the removal of lead.

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Abstract

The invention relates to a method for efficiently reducing and removing pollutants based on boronized zero-valent iron. Boronized zero-valent iron is added into the pollutant solution for pollutant removal; wherein the boronized zero-valent iron is zero-valent iron of which part of hydroxyl groups on the surface of the zero-valent iron are substituted by -OB(OH)2 groups. The method for efficientlyreducing and removing pollutants based on boronized zero-valent iron provided by the invention has relatively good reduction and removal capability on different heavy metal ions, organic pollutants and the like. The method for preparing the borated zero-valent iron by the borated modified zero-valent iron ball milling method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, specifically relates to the control and restoration of heavy metal ions and chlorine (nitro) organic matter in water bodies, and is suitable for the treatment of waste water in the fields of printing and dyeing, industry and the like. Background technique [0002] In recent years, the pollution of heavy metal ions and chlorine (nitro) organic compounds is often reported, because of its easy accumulation, irreversibility, high toxicity, slow metabolism and easy enrichment, etc., it seriously endangers human health. Due to its low price and environmental friendliness, zero-valent iron can realize the reduction and fixation of heavy metals and the dechlorination / denitration of chlorine / nitro compounds, and is widely used in the treatment of polluted groundwater. [0003] However, the surface of zero-valent iron is easily oxidized, and the surface is covered with a layer of iron oxide, and thes...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/20C02F101/36C02F101/38
CPCC02F1/70C02F2101/20C02F2101/36C02F2101/38
Inventor 张礼知胡月
Owner HUAZHONG NORMAL UNIV
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