Magnetic fly ash adsorption material as well as preparation method and application thereof

An adsorption material and fly ash technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as easy agglomeration of adsorption liquid, uncontrollable magnetic fly ash process, and decreased adsorption capacity

Active Publication Date: 2021-07-06
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the current process of preparing magnetic fly ash is uncontrollable, the obtained magnetic fly ash is a ferromagnetic material, does not have magnetic separability, and is easy to agglomerate in the adsorption liquid, resulting in a greatly reduced adsorption capacity , and further provide a magnetic fly ash adsorption material and its preparation method and application

Method used

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  • Magnetic fly ash adsorption material as well as preparation method and application thereof
  • Magnetic fly ash adsorption material as well as preparation method and application thereof
  • Magnetic fly ash adsorption material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Pretreatment of fly ash

[0032] ①Acid modification: Take 40g of raw fly ash with a size of 5 microns and disperse them in 200mL of 1M hydrochloric acid solution, stir mechanically at room temperature for 30min, then filter, wash with water until neutral, and ultrasonically Disperse and then freeze-dry to obtain acid-modified fly ash.

[0033] ②Surface state modification: Take 0.5g of the acid-modified fly ash powder obtained in step ① and disperse it in 500mL PVP (polyvinylpyrrolidone, molecular weight: Mw=20000) solution with a mass fraction of 5%. After ultrasonic treatment for 30min, maintain the temperature at 30 Under the condition of ℃, stir mechanically for 20 hours, and finally wash the excess PVP surfactant by centrifuging with water to obtain a PVP-modified fly ash material.

[0034] (2) Preparation of fly ash@MIL-88B composite

[0035] Add 0.5g of the fly ash material obtained in process ② in step (1) to 100mL of the Pluronic F127 aqueous solution with...

Embodiment 2

[0041] (1) Pretreatment of fly ash

[0042] ①Acid modification: Take 12g of raw fly ash with a size of 5 microns and disperse it in 200mL of 1M hydrochloric acid solution, stir mechanically at room temperature for 20min, then filter, wash with water until neutral, and ultrasonically Disperse and then freeze-dry to obtain acid-modified fly ash.

[0043] ②Surface state modification: Take 0.3g of the acid-modified fly ash powder obtained in step ① and disperse it in 500mL PVP (polyvinylpyrrolidone, molecular weight: Mw=15000) solution with a mass fraction of 0.1%. After ultrasonic treatment for 30min, maintain the temperature at 20 Under the condition of ℃, stir mechanically for 10 h, and finally wash the redundant PVP surfactant with water centrifugation to obtain the fly ash material modified by PVP.

[0044] (2) Preparation of fly ash@MIL-88B composite

[0045]Add 0.28g of the fly ash material obtained in the process ② in step (1) to 100mL of the Pluronic F127 aqueous soluti...

Embodiment 3

[0051] (1) Pretreatment of fly ash

[0052] ①Acid modification: Take 35g of raw fly ash with a size of 10 microns and disperse it in 200mL of 2M hydrochloric acid solution, stir mechanically at room temperature for 40min, then filter, wash with water until neutral, and sonicate in an ultrasonic cleaner. Disperse and then freeze-dry to obtain acid-modified fly ash.

[0053] ②Surface state modification: Take 1g of the acid-modified fly ash powder obtained in step ① and disperse it in 500mL PVP (polyvinylpyrrolidone, molecular weight: Mw=25000) solution with a mass fraction of 5%, and after ultrasonic treatment for 40min, maintain the temperature at 40°C Under the condition of mechanical stirring for 15 hours, finally the excess PVP surfactant was washed by centrifugation with water to obtain a PVP-modified fly ash material.

[0054] (2) Preparation of fly ash@MIL-88B composite

[0055] The fly ash material of process 2. gained in 0.8g step (1) is joined in the Pluronic F127 aq...

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Abstract

The invention relates to a magnetic fly ash adsorption material as well as a preparation method and application thereof, and aims to solve the technical problems that the process of preparing magnetic fly ash at present is uncontrollable, and the obtained magnetic fly ash is a ferromagnetic material, does not have magnetic separability and is easy to agglomerate in an adsorption solution, so that the adsorption capacity is greatly reduced. A fly ash material subjected to surface physicochemical modification is used as a carrier, the fly ash / ferric oxide composite material is obtained through controllable growth and pyrolysis conversion of a metal organic framework material (MOFs), ferric oxide in the composite material is assembled and arranged on the surface of fly ash through interaction among particles, and the total radial thickness of a ferric oxide assembly is 50 to 80 nanometers. The synthesis method is simple and good in controllability, and the prepared magnetic fly ash adsorption material is clear in structure and excellent in performance, has superparamagnetic characteristics, can ensure the dispersity of the material in the adsorption process, has double characteristics of adsorption and magnetic separation, and can be applied to the field of water pollution control.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, and in particular relates to a magnetic fly ash adsorption material and its preparation method and application. Background technique [0002] Fly ash is one of the main solid waste by-products of coal combustion, with an annual output of several tons. Its storage and disposal have caused great environmental problems. . The main components of fly ash are silicon, aluminum oxide and a small amount of iron, calcium, magnesium metal compounds. It has a large specific surface area, and it is formed under high temperature and high pressure. It has a stable structure and is a good adsorption material. As an adsorption material, fly ash is widely used in the adsorption and treatment of organic pollutants and heavy metal ions in water through reasonable physical and chemical treatment. However, in the current application process of water treatment, there are problems of high energy consumpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28
CPCB01J20/06B01J20/103B01J20/08B01J20/041B01J20/28009C02F1/281
Inventor 张晗璐刘雪峰芦冬涛郭晨夫董川
Owner SHANXI UNIV
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