CN102895941A - Method for synthesizing iron-aluminum modified bentonite - Google Patents
Method for synthesizing iron-aluminum modified bentonite Download PDFInfo
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- CN102895941A CN102895941A CN201210329781XA CN201210329781A CN102895941A CN 102895941 A CN102895941 A CN 102895941A CN 201210329781X A CN201210329781X A CN 201210329781XA CN 201210329781 A CN201210329781 A CN 201210329781A CN 102895941 A CN102895941 A CN 102895941A
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Abstract
The present invention provides a method for synthesizing iron-aluminum modified bentonite. The method comprises the following steps: arranging two anodes on an electrolyte tank, wherein the two anodes respectively are an iron electrode and an aluminum electrode, a cathode electrode is a graphite electrode, a cathode and an anode are separated by using a microporous filtration membrane, water and ions can pass through the membrane, and solid particles can not pass through the membrane; adding deionized water to the electrolyte tank; adding dried bentonite to the anode region, and arranging stirring in the anode region; switching on an electrolyte tank current; after 4-5 h, carrying out precipitation separation; and drying the obtained bentonite from precipitation to obtain the iron-aluminum modified bentonite. According to the present invention, during electrolysis, the iron electrode and the aluminum electrode are gradually oxidized to generate iron ions, the iron ions enter the solution and are subjected to exchange with calcium ions between the bentonite layer of the anode region under an electric field force effect, the calcium ions move towards the cathode under the electric field effect, the iron ions are absorbed between the bentonite layer during the movement process, the electric field exists during the exchange process, and the ions move quickly due to the electric field effect, such that the modification is complete and thorough.
Description
Technical field
The present invention relates to the environmental pollution control technique field, relate in particular to a kind of synthesizing ferrum-aluminium method for preparation of modified bentonite.
Background technology
Bentonite is the clay rock take montmorillonite (Montmorillonite) as essential mineral.Montmorillonite is a kind of moisture layer aluminosilicate mineral, forms by aluminium of two silicon-oxy tetrahedron therebetween (magnesium) oxygen (hydrogen-oxygen) are octahedra, belongs to the three-layer clay mineral of 2:1 type.Lattice spacing is from being 0.96 ~ 2.14nm, and these nanoscale twins are reunited together, forms the clay particle that the hundreds of nanometer arrives several microns.Since the hydrophily that bentonite surface silicon oxide structure is extremely strong and the hydrolysis of interlayer cation, the non-constant of performance of the bentonite adsorption treatment organic pollution of non-modified.But bentonite has very strong cation exchange capacity (CEC), under certain physical-chemical condition, can and Fe
3+, Ca
2+, Mg
2+, Na
+, K
+Deng mutually exchange.It is large that the modified alta-mud that exchange obtains through iron and aluminum ions has specific area, the characteristics that absorption property is good, and bentonitic reserves are abundant, the source is wide, processing cost is low, therefore with the pollutant in the modified alta-mud removal waste water, have huge economic results in society and ecological environment benefit.(iron carbonyl aluminium pillared bentonite Treatment of Wastewater in Coking, Yunnan chemical,, the 1st phase, 30-32 page or leaf in 2011).Larger than the obvious change of original soil through the bentonitic interlamellar spacing of pillared modification, adsorption capacity to phosphorus under experiment condition is: iron aluminium pillared bentonite〉iron prop support swelling〉the pillared swelling of the aluminium (performance study of hydroxy metal pillared bentonite Phosphate Sorption, nonmetallic ore, 2006,29 volumes, the 5th phase, the 44-46 page or leaf).
Traditional method of modifying is with the dissolving of iron and aluminium salt, synthesis of hydroxy iron or hydroxy Al, adding bentonite, vibrates, leaves standstill, filters, washs, dries, grinds, sieves.This process is comparatively loaded down with trivial details, and the halfway phenomenon of exchange can occur because stirring action power is weak, can affect product quality.
Summary of the invention
The technical problem to be solved in the present invention is: overcome that iron aluminium modified alta-mud exchanges insufficient deficiency in the prior art, a kind of synthetic iron method for preparation of modified bentonite is provided.
For solving the problems of the technologies described above the technical solution used in the present invention be: a kind of synthetic iron method for preparation of modified bentonite, step is as follows:
Electrolytic cell arranges two anodes, be respectively the ferroelectric utmost point and aluminium electrode, cathode electrode is graphite electrode, separates with miillpore filter between negative electrode and the anode, adds deionized water in the electrolytic cell, add again bentonite in the anode region, in the anode region stirring is set, connects electrolytic cell currents, electrolysis finishes postprecipitation and separates, the bentonite drying that precipitation obtains namely obtains iron aluminium modified alta-mud.
Described bentonite was for pulverizing 50 ~ 100 mesh sieves and dry bentonite.
The solid-liquid mass ratio of described bentonite and deionized water is 1:50 ~ 100.
Described speed of agitator is 50 ~ 150r/min.
Described electrolytic cell total current is 15 ~ 40mA, electrolysis 4 ~ 5h.
Described two anodes can be controlled respectively electric current, and the current ratio behind the connection electrolytic cell currents between aluminium electrode and the ferroelectric utmost point is 1:2 ~ 1:4.
Described bake out temperature is 105 ~ 110 ℃.
The invention has the beneficial effects as follows:
(1) iron in the electrolysis, aluminium electrode are produced iron ion by oxidation progressively and aluminium ion enters solution, and the calcium ion between the bentonite bed of anode region exchanges under the effect of electric field force, to movable cathode, iron ion and aluminium ion are attracted between bentonite bed in mobile process calcium ion under electric field action.
(2) exchange process is owing to there is electric field to exist, and ion is subjected to electric field action, and is rapidly mobile, so that modification comparatively fully, thoroughly.The product that modification obtains is more even, and quality is higher.
The specific embodiment
3 embodiment of the present invention below further are provided:
Embodiment 1
Electrolytic cell arranges two anodes, be respectively iron plate electrode and aluminium flake electrode, two electrodes can be controlled respectively electric current, cathode electrode is graphite electrode, separate with miillpore filter between negative electrode and the anode, water and ion can pass through, solid particulate matter can't pass through, add deionized water in the electrolytic cell, add the dry bentonite of pulverizing 100 mesh sieves in the anode region again, the solid-to-liquid ratio of bentonite and water is the 1:100(mass ratio), in the anode region stirring is set, speed of agitator is 150r/min, and connecting the electrolytic cell currents total current is 40mA, and the current ratio between aluminium anodes and the iron anode is 1:4, through 4h, precipitate and separate, the bentonite that precipitation obtains obtains iron aluminium modified alta-mud through 110 ℃ of oven dry.Product is cleared up and is got bentonitic aluminium after the modification and the content of iron is respectively 5.4% and 17.7% with Atomic Absorption Spectrometry afterwards.
The iron aluminium modified alta-mud that obtains is used for processing waste water as adsorbent, adds the bentonite 4g that this precipitation obtains in the 1L waste water that to contain orange II dye strength be 40mg/L, stir 2h, precipitate and separate is analyzed pollutant levels, and clearance reaches 93.5%.
For same waste water, add conventional method (iron, the dissolving of aluminium salt are without electric field action) the iron aluminium modified alta-mud that modification obtains of same amount, under same treatment conditions, in the identical processing time, orange II clearance is 72.8%.
Embodiment 2
Electrolytic cell arranges two anodes, be respectively iron plate electrode and aluminium flake electrode, two electrodes can be controlled respectively electric current, cathode electrode is graphite electrode, separate with miillpore filter between negative electrode and the anode, water and ion can pass through, solid particulate matter can't pass through, add deionized water in the electrolytic cell, add the dry bentonite of pulverizing 50 mesh sieves in the anode region again, the solid-to-liquid ratio of bentonite and water is the 1:50(mass ratio), in the anode region stirring is set, speed of agitator is 50r/min, and connecting the electrolytic cell currents total current is 15mA, and the current ratio between aluminium anodes and the iron anode is 1:2, through 5h, precipitate and separate, the bentonite that precipitation obtains obtains iron aluminium modified alta-mud through 105 ℃ of oven dry.Product is cleared up the rear content that gets the bentonitic iron aluminium after the modification with Atomic Absorption Spectrometry and is respectively 7.4% and 15.7%.
The iron aluminium modified alta-mud that obtains is used for processing waste water as adsorbent, adds the bentonite 4g that this precipitation obtains in the waste water that the phosphorous acid group concentration of 1L is 40mg/L, stir 2h, precipitate and separate is analyzed pollutant levels, and clearance reaches 95.1%.
For same waste water, add conventional method (iron, the dissolving of aluminium salt are without electric field action) the iron aluminium modified alta-mud that modification obtains of same amount, under same treatment conditions, in the identical processing time, the phosphate radical clearance is 75.6%.
Embodiment 3
Electrolytic cell arranges two anodes, be respectively iron plate electrode and aluminium flake electrode, two electrodes can be controlled respectively electric current, cathode electrode is graphite electrode, separate with miillpore filter between negative electrode and the anode, water and ion can pass through, solid particulate matter can't pass through, add deionized water in the electrolytic cell, add the dry bentonite of pulverizing 50 mesh sieves in the anode region again, the solid-to-liquid ratio of bentonite and water is the 100(mass ratio), in the anode region stirring is set, speed of agitator is 100r/min, and connecting the electrolytic cell currents total current is 30mA, and the current ratio between aluminium anodes and the iron anode is 1:2, through 4h, precipitate and separate, the bentonite that precipitation obtains obtains iron aluminium modified alta-mud through 110 ℃ of oven dry.Product is cleared up the rear content that gets the bentonitic iron aluminium after the modification with Atomic Absorption Spectrometry and is respectively 8.1% and 16.2%.
The iron aluminium modified alta-mud that obtains is used for processing waste water as adsorbent, adds the bentonite 4g that this precipitation obtains in the waste water that the phosphorous acid group concentration of 1L is 40mg/L, stir 2h, precipitate and separate is analyzed pollutant levels, and clearance reaches 96.3%.
For same waste water, add conventional method (iron, the dissolving of aluminium salt are without electric field action) the iron aluminium modified alta-mud that modification obtains of same amount, under same treatment conditions, in the identical processing time, the phosphate radical clearance is 76.3%.
Claims (7)
1. synthesizing ferrum-aluminium method for preparation of modified bentonite, it is characterized in that: step is as follows:
Electrolytic cell arranges two anodes, be respectively the ferroelectric utmost point and aluminium electrode, cathode electrode is graphite electrode, separates with miillpore filter between negative electrode and the anode, adds deionized water in the electrolytic cell, add again bentonite in the anode region, in the anode region stirring is set, connects electrolytic cell currents, electrolysis finishes postprecipitation and separates, the bentonite drying that precipitation obtains namely obtains iron aluminium modified alta-mud.
2. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1 is characterized in that: described bentonite was for pulverizing 50 ~ 100 mesh sieves and dry bentonite.
3. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1, it is characterized in that: the solid-liquid mass ratio of described bentonite and deionized water is 1:50 ~ 100.
4. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1, it is characterized in that: described speed of agitator is 50 ~ 150r/min.
5. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1, it is characterized in that: described electrolytic cell total current is 15 ~ 40mA, electrolysis 4 ~ 5h.
6. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1, it is characterized in that: described two anodes can be controlled respectively electric current, connect that the current ratio between the aluminium electrode and the ferroelectric utmost point is 1:2 ~ 1:4 behind the electrolytic cell currents.
7. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1, it is characterized in that: described bake out temperature is 105 ~ 110 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630437A (en) * | 2017-09-11 | 2018-01-26 | 武汉农尚环境股份有限公司 | A kind of man-made lake polycrystalline substance for improving water body self-purification ability |
| CN109295471A (en) * | 2018-09-26 | 2019-02-01 | 上海电力学院 | A method of iron aluminum hydrotalcite is prepared using sacrificial anode protection |
| CN110407668A (en) * | 2018-04-27 | 2019-11-05 | 中国石油化工股份有限公司 | A kind of method of iron tramp in removing aluminum alkoxide |
| CN112371078A (en) * | 2020-07-23 | 2021-02-19 | 江南大学 | Phosphate removal method based on activated load bentonite |
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| CN102001729A (en) * | 2009-09-03 | 2011-04-06 | 湖州四方格林自动化技术有限公司 | Electrolytic treatment method of heavy metal-containing wastewater |
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| CN102070230A (en) * | 2010-12-10 | 2011-05-25 | 华中师范大学 | Method for removing organic matters in water by utilizing three-dimensional electrode electro-fenton and device thereof |
| US20110160512A1 (en) * | 2011-03-09 | 2011-06-30 | Mehran Ghiaci | METHOD OF PREPARATION OF ZnS AND CdS NANOPARTICLES FOR DECHLORINATION OF POLYCHLOROBIPHENYLS IN OILS |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630437A (en) * | 2017-09-11 | 2018-01-26 | 武汉农尚环境股份有限公司 | A kind of man-made lake polycrystalline substance for improving water body self-purification ability |
| CN110407668A (en) * | 2018-04-27 | 2019-11-05 | 中国石油化工股份有限公司 | A kind of method of iron tramp in removing aluminum alkoxide |
| CN110407668B (en) * | 2018-04-27 | 2021-12-17 | 中国石油化工股份有限公司 | Method for removing iron impurities in alkoxy aluminum |
| CN109295471A (en) * | 2018-09-26 | 2019-02-01 | 上海电力学院 | A method of iron aluminum hydrotalcite is prepared using sacrificial anode protection |
| CN112371078A (en) * | 2020-07-23 | 2021-02-19 | 江南大学 | Phosphate removal method based on activated load bentonite |
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Effective date of registration: 20201218 Address after: No.13 caodang Road, Changshu City, Suzhou City, Jiangsu Province Patentee after: Changshu intellectual property operation center Co.,Ltd. Address before: Gehu Lake Road Wujin District 213164 Jiangsu city of Changzhou province No. 1 Patentee before: CHANGZHOU University |
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Address after: 215500 5th floor, building 4, 68 Lianfeng Road, Changfu street, Changshu City, Suzhou City, Jiangsu Province Patentee after: Changshu intellectual property operation center Co.,Ltd. Address before: No.13 caodang Road, Changshu City, Suzhou City, Jiangsu Province Patentee before: Changshu intellectual property operation center Co.,Ltd. |
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