Method for removing hexavalent chromium in water by using biochar-loaded nanometer iron-nickel composite material

A composite material and nano-iron technology, which is applied in the field of heavy metal pollution restoration in water bodies, can solve the problems of high cost and complicated preparation process, and achieve the effect of low cost, simple operation and no secondary pollution

Inactive Publication Date: 2020-02-04
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research mainly uses the liquid phase reduction method to prepare bimetallic materials such as supported nano-Fe-Ni, and most of them use NaBH 4 , hydrazine hydrate and other strong reducing agents, the preparation process is complicated and the cost is high

Method used

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  • Method for removing hexavalent chromium in water by using biochar-loaded nanometer iron-nickel composite material
  • Method for removing hexavalent chromium in water by using biochar-loaded nanometer iron-nickel composite material
  • Method for removing hexavalent chromium in water by using biochar-loaded nanometer iron-nickel composite material

Examples

Experimental program
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Effect test

example 1

[0027] (1) The corn stalks are dried, pulverized by a pulverizer, and passed through a 50-100 mesh sieve;

[0028] (2) Take 8.1g Fe(NO 3 ) 3 ‧9H 2 O and 0.3, 0.6, 1.5g Ni(NO 3 ) 2 ‧6H 2 O, dissolved in 100mL water to prepare three mixed salt solutions with different iron-nickel molar ratios.

[0029] (3) Take 10 g of corn stalk powder and soak them in the above-mentioned three iron-nickel mixed salt solutions, and after ultrasonic treatment for 40 minutes, place them in an oven for 48 hours to dry at 80°C to obtain biomass powders impregnated with different iron-nickel molar ratios.

[0030] (4) Put the biomass powder impregnated with three kinds of iron and nickel in a tube furnace, and heat up to 800 °C at a rate of 5 °C / min under the condition of continuous nitrogen flow in the tube furnace. Keep the temperature for 2 hours, and cool to room temperature naturally. Three biochar-supported nano-iron-nickel bimetallic composites were prepared.

[0031] The product char...

example 2

[0035] (1) Bagasse is dried, pulverized by a pulverizer, and passed through a 50-100 mesh sieve;

[0036] (2) Take 16.2g Fe(NO 3 ) 3 ‧ 9 h 2 O and 1.2g Ni(NO 3 ) 2 ‧6H 2 O was dissolved in 100mL of water to prepare an iron-nickel mixed salt solution.

[0037](3) Soak 20g of bagasse powder in the above-mentioned iron-nickel mixed salt solution, ultrasonically treat for 60min, and then put it into an oven for 48 hours at 100°C to dry to obtain iron-nickel-impregnated biomass powder.

[0038] (4) Place the biomass powder impregnated with iron and nickel in a tube furnace, and heat up to 760 °C at a rate of 3 °C / min under the condition of continuous nitrogen flow in the tube furnace. Keep the temperature for 2 hours, and cool to room temperature naturally. The biochar-supported nano-iron-nickel bimetallic composite was prepared.

[0039] Take 0.12g of the prepared biochar-loaded nano-iron-nickel bimetallic composite material, put it in 100mL of 10mg / L Cr(VI) solution with...

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Abstract

The invention discloses a method for removing hexavalent chromium in water by using a biochar-loaded nanometer iron-nickel composite material, and relates to a remediation method for heavy metal pollution in a water body. According to the invention, the biochar-loaded nanometer zero-valent iron-nickel bimetallic composite material is prepared in one step by using a simplified biochar-supported bimetallic material preparation process without the use of a high-cost strong reducing agent, and is applied to removal of Cr (VI) in water, so that the problems of easy surface passivation, low reactionactivity and low utilization rate in the treatment of heavy metals in a water body with nanometer zero-valent iron; and the method has advantages of low cost, simple operation and no secondary pollution, and the Cr (VI) removal activity and the stability of the biochar-loaded iron-nickel bimetallic material are higher than the Cr (VI) removal activity and the stability of the biochar-loaded nanometer zero-valent iron material.

Description

technical field [0001] The invention relates to a method for repairing heavy metal pollution in water bodies, in particular to a method for removing hexavalent chromium in water by biochar-loaded nano-iron-nickel composite materials. Background technique [0002] In recent years, with the continuous acceleration of industrialization, water pollution, especially heavy metal pollution, has become increasingly serious, which significantly threatens human health and survival. Among them, the chromium pollution situation in industrial wastewater discharge is particularly serious. The rapid expansion of heavy metal-related industries has caused the total discharge of heavy metal pollutants represented by chromium to remain at a high level, and the environmental safety hazards of heavy metal-related enterprises are still relatively prominent. The main forms of chromium in industrial wastewater discharge are Cr(VI) and Cr(III), among which Cr(VI) is more toxic and mobile. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/22
CPCC02F1/705C02F2101/22
Inventor 李士凤孙洪刚姚淑华臧淑艳
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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