CN102895941B - Method for synthesizing iron-aluminum modified bentonite - Google Patents
Method for synthesizing iron-aluminum modified bentonite Download PDFInfo
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- CN102895941B CN102895941B CN201210329781.XA CN201210329781A CN102895941B CN 102895941 B CN102895941 B CN 102895941B CN 201210329781 A CN201210329781 A CN 201210329781A CN 102895941 B CN102895941 B CN 102895941B
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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 environmental pollution control technique field, particularly relate to a kind of synthesizing ferrum-aluminium method for preparation of modified bentonite.
Background technology
The clay rock that bentonite is is essential mineral with montmorillonite (Montmorillonite).Montmorillonite is a kind of moisture layer aluminosilicate mineral, is made up of, belongs to the three-layer clay mineral of 2:1 type two silicon-oxy tetrahedron therebetween aluminium (magnesium) oxygen (hydrogen-oxygen) octahedron.Lattice spacing is from being 0.96 ~ 2.14nm, and these nanoscale twins are reunited together, forms hundreds of nanometer to the clay particle of several microns.The hydrophily extremely strong due to bentonite surface silicon oxide structure and the hydrolysis of interlayer cation, the non-constant of performance of the bentonite adsorption process organic pollution of non-modified.But bentonite has very strong cation exchange capacity (CEC), under certain physical-chemical conditions, can and Fe
3+, Ca
2+, Mg
2+, Na
+, K
+deng exchange mutually.Exchanging through iron and aluminum ions the modified alta-mud obtained, to have specific area large, the feature that absorption property is good, and bentonitic rich reserves, source is wide, processing cost is low, therefore removes the pollutant in waste water with modified alta-mud, there is 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 in 2011).Interlamellar spacing through pillared modified montmorillonite is larger than the obvious change of original soil, to the adsorption capacity of phosphorus be under experimental conditions: the pillared swelling of the iron aluminium pillared bentonite > iron prop support swelling > aluminium (performance study of hydroxy metal pillared bentonite Phosphate Sorption, nonmetallic ore, 2006,29 volumes, 5th phase, 44-46 page).
Traditional method of modifying is by iron and the dissolving of aluminium salt, synthesis of hydroxy iron or hydroxy Al, adds bentonite, vibrates, leaves standstill, filters, washs, dries, grinds, sieves.This process is comparatively loaded down with trivial details, and there will be the halfway phenomenon of exchange 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 iron aluminium modified alta-mud in prior art and exchange insufficient deficiency, provides a kind of synthesis iron method for preparation of modified bentonite.
For solving the problems of the technologies described above the technical solution used in the present invention be: a kind of synthesis iron method for preparation of modified bentonite, step is as follows:
Electrolytic cell arranges two anodes, be respectively iron electrode and aluminium electrode, cathode electrode is graphite electrode, separates, add deionized water in electrolytic cell between negative electrode and anode with miillpore filter, bentonite is added again in anode region, arrange stirring in anode region, connect electrolytic cell currents, electrolysis terminates postprecipitation and is separated, precipitate the bentonite drying obtained, namely obtain iron aluminium modified alta-mud.
Described bentonite was for pulverizing the bentonite of 50 ~ 100 mesh sieves and drying.
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.
Two described anodes can control electric current respectively, and the electric current after connecting electrolytic cell currents between aluminium electrode and iron electrode is than being 1:2 ~ 1:4.
Described bake out temperature is 105 ~ 110 DEG C.
The invention has the beneficial effects as follows:
(1) iron in electrolysis, aluminium electrode are progressively oxidized and are produced iron ion and aluminium ion enters solution, with the calcium ion between the bentonite bed of anode region exchanges under the effect of electric field force, calcium ion is to movable cathode under electric field action, and iron ion and aluminium ion are attracted between bentonite bed in the process of movement.
(2) exchange process exists owing to there being electric field, and ion is by electric field action, rapidly mobile, makes modification comparatively completely, thoroughly.The product that modification obtains is relatively more even, and quality is higher.
Detailed description of the invention
3 embodiments of the present invention are below provided further:
Embodiment 1
Electrolytic cell arranges two anodes, be respectively iron plate electrode and aluminium flake electrode, two electrodes can control electric current respectively, cathode electrode is graphite electrode, separate with miillpore filter between negative electrode and anode, water and ion can pass through, solid particulate matter cannot pass through, deionized water is added in electrolytic cell, the dry bentonite pulverizing 100 mesh sieves is added again in anode region, the solid-to-liquid ratio of bentonite and water is 1:100(mass ratio), in anode region, stirring is set, speed of agitator is 150r/min, connecting electrolytic cell currents total current is 40mA, electric current between aluminium anodes and iron anode is than being 1:4, through 4h, precipitate and separate, the bentonite that precipitation obtains is through 110 DEG C of oven dry, obtain iron aluminium modified alta-mud.Product is cleared up the content that rear Atomic Absorption Spectrometry obtains modified bentonitic aluminium and iron and is respectively 5.4% and 17.7%.
Be used for processing waste water as adsorbent by the iron aluminium modified alta-mud obtained, be add the bentonite 4g that this precipitation obtains in the waste water of 40mg/L at 1L containing orange II dye strength, stir 2h, precipitate and separate, analyze pollutant levels, clearance reaches 93.5%.
For same waste water, add conventional method (iron, aluminium salt dissolve, 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 control electric current respectively, cathode electrode is graphite electrode, separate with miillpore filter between negative electrode and anode, water and ion can pass through, solid particulate matter cannot pass through, deionized water is added in electrolytic cell, the dry bentonite pulverizing 50 mesh sieves is added again in anode region, the solid-to-liquid ratio of bentonite and water is 1:50(mass ratio), in anode region, stirring is set, speed of agitator is 50r/min, connecting electrolytic cell currents total current is 15mA, electric current between aluminium anodes and iron anode is than being 1:2, through 5h, precipitate and separate, the bentonite that precipitation obtains is through 105 DEG C of oven dry, obtain iron aluminium modified alta-mud.Product is cleared up the content that rear Atomic Absorption Spectrometry obtains modified bentonitic iron aluminium and is respectively 7.4% and 15.7%.
Be used for processing waste water as adsorbent by the iron aluminium modified alta-mud obtained, be add the bentonite 4g that this precipitation obtains in the waste water of 40mg/L in the phosphorous acid group concentration of 1L, stir 2h, precipitate and separate, analyze pollutant levels, clearance reaches 95.1%.
For same waste water, add conventional method (iron, aluminium salt dissolve, 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, 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 control electric current respectively, cathode electrode is graphite electrode, separate with miillpore filter between negative electrode and anode, water and ion can pass through, solid particulate matter cannot pass through, deionized water is added in electrolytic cell, the dry bentonite pulverizing 50 mesh sieves is added again in anode region, the solid-to-liquid ratio of bentonite and water is 100(mass ratio), in anode region, stirring is set, speed of agitator is 100r/min, connecting electrolytic cell currents total current is 30mA, electric current between aluminium anodes and iron anode is than being 1:2, through 4h, precipitate and separate, the bentonite that precipitation obtains is through 110 DEG C of oven dry, obtain iron aluminium modified alta-mud.Product is cleared up the content that rear Atomic Absorption Spectrometry obtains modified bentonitic iron aluminium and is respectively 8.1% and 16.2%.
Be used for processing waste water as adsorbent by the iron aluminium modified alta-mud obtained, be add the bentonite 4g that this precipitation obtains in the waste water of 40mg/L in the phosphorous acid group concentration of 1L, stir 2h, precipitate and separate, analyze pollutant levels, clearance reaches 96.3%.
For same waste water, add conventional method (iron, aluminium salt dissolve, 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, phosphate radical clearance is 76.3%.
Claims (5)
1. a synthesizing ferrum-aluminium method for preparation of modified bentonite, is characterized in that: step is as follows:
Electrolytic cell arranges two anodes, be respectively iron electrode and aluminium electrode, cathode electrode is graphite electrode, separates, add deionized water in electrolytic cell between negative electrode and anode with miillpore filter, bentonite is added again in anode region, arrange stirring in anode region, connect electrolytic cell currents, electrolysis terminates postprecipitation and is separated, precipitate the bentonite drying obtained, namely obtain iron aluminium modified alta-mud;
Described electrolytic cell total current is 15 ~ 40mA, electrolysis 4 ~ 5h; Two described anodes can control electric current respectively, and the electric current after connecting electrolytic cell currents between aluminium electrode and iron electrode is than being 1:2 ~ 1:4.
2. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1, is characterized in that: described bentonite is the bentonite pulverizing 50 ~ 100 mesh sieves and drying.
3. synthesizing ferrum-aluminium method for preparation of modified bentonite according to claim 1, 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, 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, is characterized in that: described bake out temperature is 105 ~ 110 DEG C.
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| 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 |
| 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 |
Citations (3)
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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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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 |
Non-Patent Citations (1)
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| 《镁铝双氢氧化物和镁铁铝改性蒙脱土去除水体中磷的吸附效果研究》;张文豪 等;《农业环境科学学报》;20111031;第30卷(第10期);第2062页最后1行-2063页第5行 * |
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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. |