Nano zero-valent iron manganese bi-metal and preparation method and application thereof

A nano-zero-valent iron and bimetal technology, applied in metal processing equipment, nanotechnology, nanotechnology, etc., can solve the problems of toxicity, environmental protection, and precious metals showing no economic value, and achieve simple and fast operation and simple preparation , Increase the effect of the ability to degrade pollutants

Active Publication Date: 2020-10-23
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some precious metals and other metal elements used in the research process are partially toxic and not environmentally friendly, and precious metals do not show improvement in economic value

Method used

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  • Nano zero-valent iron manganese bi-metal and preparation method and application thereof
  • Nano zero-valent iron manganese bi-metal and preparation method and application thereof
  • Nano zero-valent iron manganese bi-metal and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0046] Preparation of nanometer zero-valent iron-manganese bimetallic: Weigh 2.782g FeSO 4 ·7H 2 O is dissolved in the alcohol-water system, and 1.5134g NaBH 4 Dissolve in 100mL deionized water and add dropwise into a three-necked flask using a dropper. The reaction lasts for 30min to ensure that iron ions are reduced to zero-valent iron; then add different masses of MnSO 4 ·H 2 O, so that the mass ratio of Fe:Mn is 5:1, 10:1, 15:1, 20:1 respectively, adding MnSO 4 ·H 2 After O, continue to stir for 20 minutes to ensure that the solution is completely mixed, and then add 1.5134g NaBH 4 Dissolve in 100mL deionized water and add dropwise into a three-necked flask using a dropper, and continue stirring for 30min after the dropwise addition. The reaction was mechanically stirred in a three-necked flask, and N was introduced during the reaction. 2Perform reaction protection. The prepared nano-zero-valent iron-manganese bimetallic metal was separated from solid and liquid by ...

Embodiment 2

[0053] The nanometer zero-valent iron-manganese bimetal prepared by the present invention is subjected to the degradation experiment of tetracycline under the action of various common ions in groundwater as follows:

[0054] The water used in the experiment is configured by ourselves to simulate the concentration of the eight major anions and cations contained in groundwater. where Na + The concentration is 20mg / L, K + The concentration is 30mg / L, Ca + The concentration is 25mg / L, Mg + The concentration is 5mg / L, Cl - The concentration is 10mg / L, The concentration is 20mg / L, Concentration is 88mg / L, The concentration is 5mg / L and the pH is 6.78. When the five anions Cl - , and When the concentration of Fe / Mn is 5.0mg / L, the degradation efficiency of Fe / Mn bimetal to tetracycline decreases from 99.05% to 71.57%, 66.79%, 76.63%, 83.64% and 98.54% in turn, in the whole reaction process, the anion pair system The order of magnitude of impact is: It can be seen ...

Embodiment 3

[0056] The migration ability of the nanometer zero-valent iron-manganese bimetal prepared in the present invention in the water-soil medium can affect the contact condition between the restoration material and the pollutant, forming a reaction zone within a certain range. Nano-restoration materials have strong migration ability in water and soil media, which can better repair groundwater pollution, and finally achieve a better repair effect on tetracycline-contaminated groundwater. The experiment is as follows:

[0057] The material used in the column experiment is plexiglass, with a length of 50cm and an inner diameter of 3.0cm. Set up a sampling port every 10cm, a total of 5. A peristaltic pump was used to control the liquid flow rate. Simulate the real groundwater environment. Sieve the purchased quartz sand according to fine sand, medium sand and coarse sand, soak it with 3M HCl for 30 minutes under ultrasonic conditions, wash it with ultrapure water for many times unti...

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Abstract

The invention discloses nano zero-valent iron manganese bi-metal and a preparation method and application thereof. The nano zero-valent iron manganese bi-metal is prepared by two-step liquid-phase reduction with divalent iron salt as an iron source and divalent manganese salt as a manganese source. According to the preparation method, the technology is simple, raw materials are easy to obtain, requirements for equipment are low, the process is simple, the controllability of reaction conditions is high, the dispersion of the nano zero-valent iron can be effectively improved by the addition of Mn, agglomeration of the nano zero-valent iron is prevented, meanwhile the passivation of the nano zero-valent iron is slowed down, and the prepared nano zero-valent iron manganese bi-metal has excellent reaction activity; and the nano zero-valent iron manganese bi-metal prepared by the preparation method has high catalytic oxidation reducing capacity, and has good removal effect on organic pollutants, meanwhile good migration and distribution characteristics and good degradation ability are achieved in simulated groundwater environment, and the nano zero-valent iron manganese bi-metal can be applied to the degradation and removal of organic pollutants in surface water or groundwater.

Description

technical field [0001] The invention belongs to the field of nano-material environmental restoration, and in particular relates to a nano-scale zero-valent iron-manganese bimetal and its preparation method and application. Background technique [0002] In recent years, nano-zero-valent iron has shown superior performance in solving organic pollution in surface water or groundwater. It is also one of the most widely developed and perfect technologies for in-situ chemical redox of groundwater pollution. standard technology. Nano-sized zero-valent iron has strong reducing activity, wide sources, and is not easy to cause secondary pollution. However, in the application process of zero-valent iron, there are problems such as easy agglomeration, easy oxidation and passivation, and poor electron selectivity. A lot of research has been done on the modification of zero-valent iron, and all of them are quite effective. Among them, the use of bimetallic doping can increase the reactiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00C02F1/70C02F101/30
CPCB22F9/24B82Y40/00B82Y30/00C02F1/70B22F1/054
Inventor 廖兵卢涛刘国刘静徐芬
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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