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Method for in-situ preparation of nickel-iron bimetallic materials by repairing nickel ion polluted wastewater

An in-situ preparation, bimetallic technology, applied in water pollutants, metal processing equipment, water/sewage treatment, etc., to achieve the effects of low energy consumption, fast speed, and mild reaction conditions

Active Publication Date: 2019-08-30
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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  • Method for in-situ preparation of nickel-iron bimetallic materials by repairing nickel ion polluted wastewater
  • Method for in-situ preparation of nickel-iron bimetallic materials by repairing nickel ion polluted wastewater
  • Method for in-situ preparation of nickel-iron bimetallic materials by repairing nickel ion polluted wastewater

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 a method for preparing Ni / Fe bimetallic materials in situ by repairing nickel ion polluted wastewater, comprising the following steps: (1) Bentonite loaded with zero-valent iron is composed of bentonite, FeSO 4 ·7H 2 O and NaBH 4 Mix and react together, wash with deoxygenated water and ethanol, and prepare by vacuum freeze-drying; (2) adjust the pH of wastewater containing heavy metal Ni(II) ions to 3-7; (3) combine the prepared bentonite loaded with zero-valent iron with Wastewater containing heavy metal Ni(II) ions was mixed in an oscillator protected by an inert gas; (4) After the reaction was completed, the Ni / Fe bimetallic material was prepared by washing and vacuum freeze-drying. The invention has simple process, low cost and no secondary pollution to the environment, and is a simple, effective, low-cost and green method for preparing Ni / Fe bimetallic materials.

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 Patents(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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