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In-situ preparation method for Ni/Fe bimetal material by repairing nickel ion polluted waste water

An in-situ preparation and bimetallic technology, applied in water pollutants, water/sewage treatment, metal processing equipment, etc., to achieve low energy consumption, fast speed, and good stability

Active Publication Date: 2018-02-23
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there have been no literature reports and patent publications to prepare highly active Ni / Fe bimetallic materials in situ by using zero-valent iron to remediate Ni(II) pollution in wastewater.

Method used

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  • In-situ preparation method for Ni/Fe bimetal material by repairing nickel ion polluted waste water
  • In-situ preparation method for Ni/Fe bimetal material by repairing nickel ion polluted waste water
  • In-situ preparation method for Ni/Fe bimetal material by repairing nickel ion polluted waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) in N 2 Under protection, 0.5g / L sodium bentonite, 0.05mol / L FeSO 4 ·7H 2 O and 0.1mol / L NaBH 4 Mix and stir for 2 hours, wash with deoxygenated water and ethanol, and vacuum freeze-dry to prepare bentonite-supported nanometer zero-valent iron.

[0030] (2) Weigh the bentonite loaded with zero-valent iron (25 mg iron content) prepared in step (1) and add it to the wastewater containing 200 mg / L Ni(II) (adjust the pH to 6). in N 2 Under protection, shake the reaction for 2 hours (150 rpm, 25°C). After the reaction, the solid was obtained by centrifugation, and the residual Ni(II) in the supernatant was determined to be zero, and the removal rate of Ni(II) was 100%. The solid was washed, vacuum freeze-dried, and determined by XPS to contain zero-valent nickel active components such as figure 1 As shown, the results confirm that the Fe / Ni(II) bimetal was indeed formed during the treatment of Ni(II) with zero-valent iron loaded on bentonite.

[0031] (3) Add the N...

Embodiment 2

[0033] (1) Bentonite loaded with zero-valent iron was prepared according to the method of step (1) in Example (1).

[0034](2) Weigh the bentonite loaded with zero-valent iron (15 mg iron content) prepared in step (1) and add it to the waste water containing 100 mg / L Ni(II) (adjust the pH to 5). 2 Under protection, shake the reaction for 2 hours (150 rpm, 25°C). After the reaction, the Ni / Fe bimetallic material was obtained by centrifugation, and the residual Ni(II) in the supernatant was determined to be zero, and the removal rate of Ni(II) was 100%.

[0035] (3) Add the Ni / Fe bimetallic material obtained in step (2) and the Ni / Fe bimetallic material prepared by conventional methods (the iron content of the two materials are the same), respectively, into Benzene wastewater (pH 6), N 2 Shake the reaction under protection for 2 hours (150 rpm, 25°C). After the reaction, the products and their concentrations in the wastewater were measured respectively. The results showed th...

Embodiment 3

[0037] (1) Bentonite loaded with zero-valent iron was prepared according to the method of step (1) in Example (1).

[0038] (2) Weigh the bentonite loaded with zero-valent iron (10 mg iron content) prepared in step (1) and add it to the wastewater containing 50 mg / L Ni(II) (adjust the pH to 6.5). 2 Under protection, shake the reaction for 1 hour (150 rpm, 25°C). After the reaction, the Ni / Fe bimetallic material was obtained by centrifugation, and the residual Ni(II) in the supernatant was determined to be zero, and the removal rate of Ni(II) was 100%.

[0039] (3) Add the Ni / Fe bimetallic material obtained in step (2) to the wastewater containing 20 mg / L p-chlorophenol (pH 6), N 2 Shake the reaction under protection for 2 hours (150 rpm, 25°C). After the reaction, the products and their concentrations in the wastewater were measured respectively. The results show that the Ni / Fe bimetallic material has completely reduced p-chlorophenol to phenol, indicating that the chlorine...

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Abstract

The invention relates to an in-situ preparation method for a Ni / Fe bimetal material by repairing nickel ion polluted waste water. The in-situ preparation method comprises the following steps that (1)bentonite, FeSO4.7H2O and NaBH4 are mixed for reaction and then are washed through deoxygenated water and ethylalcohol, vacuum freeze-drying is conducted, and bentonite load zero-valent iron is obtained; (2) the pH of the waste water containing heavy metal Ni (II) ions is adjusted to be 3-7; (3) the prepared bentonite load zero-valent iron and the waste water containing the heavy metal Ni (II) ions are mixed in an inert gas-protected oscillator; (4) after reaction is finished, washing and vacuum freeze-drying are conducted, and the nickel-iron bimetal material is obtained. The in-situ preparation method for the Ni / Fe bimetal material by repairing the nickel ion polluted waste water is simple in process and low in cost, simple, effective and environment-friendly, and does not generate secondary pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of material processing and preparation and environmental protection engineering, and specifically relates to a method for using bentonite to load zero-valent iron to repair Ni(II) pollution in wastewater, and to prepare a highly active Fe / Ni bimetallic material in situ, so as to achieve variable The purpose of turning waste into treasure. Background technique [0002] Nano-zero-valent iron has the characteristics of large specific surface area and high reactivity, and is widely used in the removal of heavy metals in environmentally polluted water bodies and the degradation of organic compounds such as nitrobenzene compounds. However, because zero-valent iron is easy to agglomerate and the surface is easy to passivate, the dechlorination and degradation effect of zero-valent iron on highly toxic chlorinated organic compounds such as chlorinated phenols and chlorinated hydrocarbons is not good. In contrast, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02C02F1/70C02F101/36
CPCC02F1/705B22F9/24C02F2101/36B22F1/17
Inventor 董华平李益民栗占峰黄琎
Owner SHAOXING UNIVERSITY
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