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Preparation method of superparamagnetic bentonite-based water treating agent

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

Active Publication Date: 2014-12-03
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 treating agent

Examples

Experimental program
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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 , 40 mL of alkaline mixed solution of 5 grams of hydrazine hydrate;

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

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

Embodiment 2

[0040] Embodiment two (co-precipitation method): the preparation method of superparamagnetic bentonite-based water treatment agent, its concrete preparation steps are: step one: the deionized water of 30 mL is added in the flask containing 1g calcium-based bentonite in 250 mL, mechanically Stir for 1 h and set aside.

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

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 4.0 g of Fe(NO 3 ) 3 ﹒ 9H 2 O joins N 2 Dissolve 20 mL of absolute ethanol in a protected autoclave, add 3.6 g of urea, stir for 20 min, add 0.5 g of oleic acid, heat up to 100 °C, then add 0.5 g of calcium-based bentonite, take out the vacuum at 60 °C Dry for 6 h, then raise the temperature to 200 °C for 5 h, cool to room temperature, wash with absolute ethanol for 3 to 5 times, and perform 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 88 emu / g.

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

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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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IPC IPC(8): B01J20/12B01J20/30C02F1/28
Inventor 马建超王玲玲马清亮章青芳张朵朵张继龙
Owner TAIYUAN UNIV OF TECH
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