Preparation method of superparamagnetic bentonite-based water treatment agent

A superparamagnetic, water treatment agent technology, applied in adsorption water/sewage treatment, chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult separation of liquid and solid, poor adsorption and purification of industrial wastewater, and inconvenient use. , to achieve the effect of facilitating solid-liquid separation and good adsorption and purification of industrial wastewater

Active Publication Date: 2016-01-06
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the defects of the above-mentioned prior art that it is difficult to separate liquid from solid in practical application, the effect of adsorption and purification of industrial wastewater is not good, and the use is inconvenient, the present invention provides a method for preparing a superparamagnetic bentonite-based water treatment agent

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  • Preparation method of superparamagnetic bentonite-based water treatment agent

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Effect test

Embodiment 1

[0033]Embodiment 1 (co-precipitation method): the preparation method of this kind of superparamagnetic bentonite-based water treatment agent, its specific production steps are: Step 1: put 1.5g of calcium-based bentonite into a 250ml flask, add 40ml of Ionized water was mechanically stirred for 1.5h.

[0034] Step 2: Prepare FeCl containing 1.39g respectively 2 ﹒ 4H 2 O and 3.77 g FeCl 3 ·6H 2 20 mL of acidic mixed solution of O and 2 g of NH 4 HCO 3 , 10 g of Na 2 CO 3 , an alkaline mixed solution of 40 mL of hydrazine hydrate of 5 grams;

[0035] Step 3: Fill the flask with N 2 Finally, with the ratio of acidic solution: alkaline solution = 1:2, the acidic solution and the alkaline solution were added to the flask containing the bentonite suspension at a simultaneous drop rate, and heated in a water bath for 2 hours.

[0036] Step 4: stop heating and cool to room temperature, perform magnetic separation and wash with absolute ethanol for 3 to 5 times.

[0037] Ste...

Embodiment 2

[0040] Example 2 (co-precipitation method): the preparation method of superparamagnetic bentonite-based water treatment agent, its specific production steps are: Step 1: Add 30mL of deionized water to a 250mL flask containing 1g of calcium-based bentonite, and mechanically stir for 1h for later use.

[0041] Step 2: prepare FeSO containing 1.94g respectively 4 ·7H 2 O and 3.77 g FeCl 3 ·6H 2 20mL acidic mixed solution of O and 8.0g of Na 2 CO 3 , 40mL alkaline mixed solution of 0.5g NaOH;

[0042] Step 3: Fill the flask with N 2 Finally, the acid-base solution was simultaneously added to the flask containing the bentonite suspension at a rate of 1:2, while heating in a water bath for 2 hours.

[0043] Step 4: stop heating and cool to room temperature, perform magnetic separation and wash with absolute ethanol for 3 to 5 times.

[0044] Step 5: After washing, vacuum-dry at 60° C. for 3-6 hours, grind and pass through a 120-mesh sieve to obtain a superparamagnetic benton...

Embodiment 3

[0047] Embodiment three (thermal decomposition method): the preparation method of superparamagnetic bentonite-based water treatment agent, its specific preparation steps are:

[0048] Weigh 4.0g of Fe(NO 3 ) 3 ﹒ 9H 2 O joins N 2 Dissolve 20mL of absolute ethanol in a protected autoclave, add 3.6g of urea, stir for 20min, add 0.5g of oleic acid, heat up to 100°C, then add 0.5g of calcium-based bentonite, take it out and dry it in vacuum at 60°C for 6h , then heated up to 200°C for 5 hours, cooled to room temperature, washed with absolute ethanol for 3 to 5 times, and then subjected to magnetic separation. Vacuum dry at 60°C for 3-6 hours, grind and pass through a 120-mesh sieve to obtain a superparamagnetic bentonite-based water treatment agent with a saturation magnetization of about 88emu / g.

[0049] Taking methylene blue as the simulated wastewater, the concentration of methylene blue is 4.0mg / L. Add 0.5g of magnetic bentonite sample to 50mL of wastewater, shake it bac...

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Abstract

The invention discloses a preparation method of a superparamagnetic bentonite-based water treating agent and belongs to the field of environmental protection and adsorbing-method water treatment. The preparation method comprises the following steps: (1) preparing modified bentonite suspension; (2) preparing a mixed aqueous solution of deionized water or distilled water of an inorganic or organic iron source containing Fe<2+> and Fe<3+>; (3) preparing an alkaline-substance aqueous solution; (4) carrying out synthesis in a reaction container; and (5) cleaning, drying and grinding. The preparation method disclosed by the invention has the advantages that the adsorptivity is good, the magnetic separation and recycling are easy, the preparation process is simple, materials are easily available, the reaction is mild and the effect of adsorbing coal slime and other impurities in coal-slime water is relatively good.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment, and in particular relates to a preparation method of a superparamagnetic bentonite-based water treatment agent. Background technique [0002] The wastewater pollutants produced in the process of modern industrial production have always been a problem of concern to many domestic environmental protection workers and management departments. Especially in the mining and metallurgical industry, the treatment of mineral wastewater is the key to the normal production of enterprises, and the recycling of tailings concentrate also affects the economic benefits of enterprises. How to effectively and economically treat industrial wastewater has always been a hot spot in the research of water treatment in various countries. [0003] In recent years, magnetic nanotechnology has received widespread attention in the field of environmental restoration. Magnetic nanoparticles can not only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28
Inventor 马建超原林虎原申惠章青芳肖宇强张朵朵张继龙马清亮
Owner TAIYUAN UNIV OF TECH
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