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Method for synthesizing iron-modified bentonite

A technology of bentonite and iron synthesis, applied in the field of environmental pollution control, can solve problems such as insufficient exchange of iron-modified bentonite, and achieve high-quality results

Active Publication Date: 2014-04-30
江阴智产汇知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is: to overcome the deficiencies such as insufficient exchange of iron-modified bentonite in the prior art, and to provide a method for synthesizing iron-modified bentonite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The anode electrode of the electrolytic cell is an iron sheet electrode, and the cathode electrode is a graphite electrode. The cathode and the anode are separated by a microporous filter membrane. Deionized water is added to the electrolytic cell, and then dry bentonite crushed through a 100-mesh sieve is added to the anode area. The solid-to-liquid ratio of bentonite and water is 1:100 (mass ratio). Set stirring in the anode area. The stirring speed is 150r / min. Connect the electrolytic cell with a current of 5mA. After 5h, the precipitate is separated, and the bentonite obtained by precipitation is baked at 110°C. dry to obtain iron-modified bentonite. After the product was digested, the iron content of the modified bentonite was measured by atomic absorption spectrometry to be 30.2%.

[0018] The obtained iron-modified bentonite is used as a catalyst to treat waste water, and in the dye orange II waste water of 25mg / L, the modified bentonite 1g and 0.1mL of H are ad...

Embodiment 2

[0021] The anode electrode of the electrolytic cell is an iron sheet electrode, and the cathode electrode is a graphite electrode. The cathode and the anode are separated by a microporous filter membrane. Deionized water is added to the electrolytic cell, and then dry bentonite crushed through a 50-mesh sieve is added to the anode area. The solid-to-liquid ratio of bentonite and water is 1:50 (mass ratio), and agitation is set in the anode area, the stirring speed is 50r / min, the current of the electrolytic cell is connected to 40mA, and after 4 hours, precipitation is separated, and the bentonite obtained by precipitation is baked at 105°C. After drying, iron-modified bentonite is obtained. After the product was digested, the iron content of the modified bentonite was measured by atomic absorption spectrometry to be 31.7%.

[0022] The obtained iron-modified bentonite is used as a catalyst to treat waste water, and in 1L concentration of dyestuff acid scarlet wastewater, add ...

Embodiment 3

[0025] The anode electrode of the electrolytic cell is an iron sheet electrode, and the cathode electrode is a graphite electrode. The cathode and the anode are separated by a microporous filter membrane. Deionized water is added to the electrolytic cell, and then dry bentonite crushed through an 80-mesh sieve is added to the anode area. The solid-to-liquid ratio of bentonite and water is 1:50 (mass ratio), and agitation is set in the anode area, the stirring speed is 150r / min, and the current of the electrolytic cell is 40mA. After 5h, the precipitation is separated, and the bentonite obtained by precipitation is baked at 110°C. After drying, iron-modified bentonite is obtained. After the product was digested, the iron content of the modified bentonite was measured by atomic absorption spectrometry to be 35.2%.

[0026] The obtained iron-modified bentonite is used as an adsorbent to treat wastewater, and 2 g of the modified bentonite is added to 1 L of wastewater containing c...

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Abstract

The invention discloses a method for synthesizing iron-modified bentonite, which comprises the steps of: taking an iron sheet electrode as a positive electrode of an electrolytic cell and a graphite electrode as a negative electrode of the electrolytic cell, and isolating the negative electrode and the positive electrode by a microporous membrane; adding de-ionized water into the electrolytic cell, and adding dried bentonite into the positive electrode zone; stirring in the positive electrode zone at a stirring rate of 50-150r / min; conducting current of 5-40mA to the electrolytic cell; precipitating and separating for 4-5h; and drying the bentonite which is obtained by precipitation at 105-110 DEG C, to obtain the iron-modified bentonite. In the electrolysis process, the iron electrode is gradually oxidized into iron ions which enter into a solution, and iron ions are moved towards the negative electrode under function of an electric field and are adsorbed among layers of the bentonite during moving. Since the existence of the electric field in the exchange process, the ions are rapidly moved under the function of the electric field, so that the modification is complete and absolute. The iron-modified bentonite obtained from the modification is better in uniformity and quality.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a method for synthesizing iron-modified bentonite. Background technique [0002] Bentonite is a clay rock with Montmorillonite as the main mineral. Montmorillonite is a hydrated layered aluminosilicate mineral, composed of two silicon-oxygen tetrahedrons sandwiching an aluminum (magnesium) oxygen (oxygen) octahedron, belonging to a 2:1 type three-layer clay mineral. The distance between crystal layers is 0.96~2.14nm, and these nanosheets are agglomerated together to form clay particles of hundreds of nanometers to several micrometers. Due to the strong hydrophilicity of the silicon-oxygen structure on the surface of bentonite and the hydrolysis of interlayer cations, the performance of unmodified bentonite for adsorption and treatment of organic pollutants is very poor. However, bentonite has a strong cation exchange capacity, and under certain physical-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28
Inventor 马建锋邹静姚超李定龙
Owner 江阴智产汇知识产权运营有限公司
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