CN101543767A - Method for preparing lead ion adsorbent by using aluminum sulfate to modify natural kaolin - Google Patents
Method for preparing lead ion adsorbent by using aluminum sulfate to modify natural kaolin Download PDFInfo
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- CN101543767A CN101543767A CN200910111661A CN200910111661A CN101543767A CN 101543767 A CN101543767 A CN 101543767A CN 200910111661 A CN200910111661 A CN 200910111661A CN 200910111661 A CN200910111661 A CN 200910111661A CN 101543767 A CN101543767 A CN 101543767A
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Abstract
The invention relates to a method for preparing a lead ion adsorbent by using aluminum sulfate to modify natural kaolin. The technical proposal comprises the following steps: weighing the natural kaolin, preliminarily grinding the kaolin into powder, adding the aluminum sulfate into the kaolin powder according to a weight proportion of the natural kaolin to the aluminum sulfate of 10:1.8-3.2, fully mixing the aluminum sulfate and the kaolin powder, adding distilled water into the mixture, and stirring the mixture evenly to form a paste mixture; after keeping the paste mixture stand for 20 to 30 minutes, placing the paste mixture into a thermostatic oven, gradually raising the temperature to between 85 and 110 DEG C, and preserving the heat for 1 hour; transferring the mixture into a muffle furnace, gradually raising the temperature to between 245 and 285 DEG C, and baking the mixture for 0.5 to 1.8 hours to modify; and after the mixture is naturally cooled, grinding the mixture, and sieving the mixture by a 300-mesh sieve to obtain the special adsorbent capable of adsorbing lead ions. The modified kaolin preparation method is simple, has low preparation cost and is suitable for industrialized production. The adsorbing capacity of the kaolin modified by the method is remarkably increased for Pb2+, and is 4 to 5 times of the natural kaolin; and the modified kaolin can be used in a wide pH range.
Description
Technical field
The present invention relates to a kind of preparation of adsorbent method, relate to a kind of aluminum sulfate (Al that utilizes specifically
2(SO
4)
3.18H
2O) natural kaolin is carried out the method that modification prepares adsorbents for lead ion pyrolytic.
Technical background
Lead is toxic pollutant important in the environment, and each state of the world today is all paid much attention to the harm of human health damage, especially children's health due to the environment lead contamination, and lead contamination not only influences health, and influences child intelligence and grow.It is reported, owing to plumbously in the water body, soil, air shifted to organism, cause that lead tolerance average scope is 0.1 ~ 1mgkg in the various plant foods in the whole world by bio-absorbable
-1, must take measures, prevent and treat its harm.Tradition effluent containing heavy metal ions processing method has chemical method and bioanalysis etc., all exists various drawbacks, cost height for example, and the cycle is long, the regeneration difficulty.Therefore, efficient cheapness of exploitation and the easy adsorbents for lead ion pyrolytic of regeneration and correlation technique have become one of urgent task in environmental protection field, and kaolin is increasing as the concern that a kind of resourceful natural minerals is subjected in environmental protection.
Because the natural kaolin interlamellar spacing is less, cation exchange capacity is low, and adsorption capacity is difficult to reach and directly applies to the requirement that water pollutes processing, is restricted on actual scale is used.But its particle is trickle, has bigger incomplete surface, the interlayer adhesion a little less than, and exist the unsaturated filling distortion of layer inner structure, these characteristics provide Applied Physics and chemical treatment method to change the possibility of its structure and character.Therefore, effectively kaolin is processed processing, change kaolinic surface nature or interior layer aggregated(particle) structure,, just become in recent years relatively one of popular topic to prepare the kaolin raw material that is suitable for various application purposes.
Summary of the invention
The objective of the invention is to utilize aluminum sulfate (Al
2(SO
4)
3.18H
2O) natural kaolin is carried out modification, be prepared into method the special-purpose adsorbent of adsorpting lead ion in the aqueous solution.
For realizing that the technical scheme that purpose of the present invention adopts is: take by weighing natural kaolin, after tentatively being ground into powder, according to natural kaolin: aluminum sulfate is 10: 1.8～3.2 part by weight, the aluminum sulfate that adds, after fully mixing, add distilled water again and stir and make it become pasty mixture; After this pasty mixture left standstill 20～30min, place constant temperature oven to be warming up to 85～110 ℃ gradually, insulation 1h; Then move in the Muffle furnace, be warming up to 245 ℃～285 ℃ gradually and carry out modification by calcination, roasting time is 0.5～1.8h; Treat that grinding 300 orders after the nature cooling sieves, promptly prepare can adsorpting lead ion special-purpose adsorbent.
For investigating special-purpose adsorbent that can adsorpting lead ion of the present invention to the adsorption effect of heavy metal ion lead in the actual waste water, this research Electroplate Factory in the ocean, Fuzhou City fetches actual heavy metal wastewater thereby sample and handles.Electroplate Factory mainly manages Treatment of Metal Surface and heat treatment process in the ocean, contains a certain amount of various heavy metal ion in the waste water that is produced, as Pb, Cr, Cu, Zn etc., unprocessed before, be light yellow, pH value of solution is 2.7.After measured, get in the waste water sample and contain Pb
2+Concentration is about 9.6mgL
-1About.For investigate natural and modified kaolin to high, normal, basic variable concentrations Pb
2+Absorption property, adopt the way add the standard plumbi nitras, make Pb in the actual waste water
2+Concentration is respectively 9.6mgL
-1, 48mgL
-1And 155mgL
-1The lead waste water of high, normal, basic concentration, and respectively be equipped with two parts, volume all is 20mL, place the 50mL plastic centrifuge tube respectively, respectively add 1g, 1g, 0.5g modified kaolin in the corresponding high, normal, basic concentration, mixing is placed in the 150rpm shaking table, centrifugal dilution metering is taken out in vibration absorption after 1 hour.Be simultaneously the contrast experiment of natural kaolin absorption under the same conditions, the results are shown in following table:
Tab·3-10Adsorption?of?Pb
2+from?actual?waste?water?by?natural?and?modified?kaolin
By data in the table as can be seen, after natural and modified kaolin are handled, Pb in the waste water
2+Concentration all decreases.Work as Pb
2+Concentration is contained concentration 9.6mgL in the real solution
-1The time, be reduced to 1.52 and 0.73mgL after treatment respectively
-1, clearance is 84% and 92%, can directly discharge after modified kaolin is handled.Pb in waste water
2+Mark-on concentration is 48mgL
-1, after natural and modified kaolin is handled through 1g, Pb
2+Concentration is reduced to 20.2 and 8.5mgL respectively
-1, clearance is respectively 58% and 82%.Though all do not reach discharge standard, the modified kaolin adsorption effect is significantly better than natural kaolin.Pb in actual waste water
2+Mark-on concentration is up to 155mgL
-1The time, modified kaolin does not fall counter increasing to its adsorbance, and clearance reaches 98%, and the clearance of natural kaolin only is 58% at this moment.Than natural kaolin, the modified kaolin adsorbance is obviously bigger, and adsorption capacity obviously is eager to excel, and to high Pb concentration
2+Waste water has remarkable feature absorption property.
Contain Zn, Cd plasma in the actual waste water simultaneously, concentration is respectively 172mgL
-1And 68mgL
-1Experiment showed, waste water after natural kaolin is handled, residual concentration is respectively 168mgL
-1And 64mgL
-1, change not quite, and after modified kaolin was handled, the concentration of two kinds of ions all decreased, and reduces to 157mgL respectively
-1And 52mgL
-1As seen, modified kaolin also has certain adsorption effect to heavy metal ion such as Zn, Cd.
Modified kaolin preparation method of the present invention is simple, and preparation cost is low, is fit to suitability for industrialized production.Obviously increase through the modified kaolin of this method modification adsorbance Pb2+, be natural kaolin 4-5 doubly, can in wider pH range, use.
Description of drawings
Fig. 1 has shown the natural kaolin microscopic appearance of the non-modified of utilizing environmental scanning electronic microscope mensuration.
Fig. 2 has shown the modified kaolin microscopic appearance that utilizes the aluminum sulfate modification of the present invention that utilizes environmental scanning electronic microscope to measure.
Fig. 1, Fig. 2 instrument are Dutch Philips-FEIXL30ESEM-TMP analyzer.
As seen from Figure 1, the natural kaolin laminated structure is obvious, and stacking closely interlamellar spacing is littler, so its Specific area is also lower. Although and Fig. 2 shows kaolin after the sulfate modification still take laminated structure as main, But the surface is obviously fluffy, and fragment and acicular texture increase, and hole increases, and specific area increases (BET surface area Measurement result is 9.53m2·g
-1), so its counterweight metal biosorption amount also obviously increases than natural kaolin.
The specific embodiment
Embodiment 1
Take by weighing natural kaolin 100 grams, after tentatively being ground into powder, place the china bowl of 500ml, add the aluminum sulfate (Al of 18 grams
2(SO
4)
3.18H
2O), after mixing, progressively add distilled water, the limit edged stirs, and makes it become pasty mixture; After this pasty mixture left standstill 30min, move in the constant temperature oven and be warming up to 80 ℃ gradually, insulation 1h; Then move in the Muffle furnace again, be warming up to 285 ℃ of modification by calcination gradually, roasting time is 1h; Treat that grinding 300 orders after the nature cooling sieves, promptly prepare can adsorpting lead ion special-purpose adsorbent.
Embodiment 2
Take by weighing natural kaolin 100 grams, after tentatively being ground into powder, place the china bowl of 500ml, add the aluminum sulfate (Al of 22 grams
2(SO
4)
3.18H
2O), after mixing, progressively add distilled water, the limit edged stirs, and makes it become pasty mixture; After this pasty mixture left standstill 20min, move in the constant temperature oven and be warming up to 110 ℃ gradually, insulation 1h; Then move in the Muffle furnace again, be warming up to 245 ℃ of modification by calcination gradually, roasting time is 1.8h; Treat that grinding 300 orders after the nature cooling sieves, promptly prepare can adsorpting lead ion special-purpose adsorbent.
Embodiment 3
Take by weighing natural kaolin 100 grams, after tentatively being ground into powder, place the china bowl of 500ml, add the aluminum sulfate (Al of 28 grams
2(SO
4)
3.18H
2O), after mixing, progressively add distilled water, the limit edged stirs, and makes it become pasty mixture; After this pasty mixture left standstill 25min, move in the constant temperature oven and be warming up to 98 ℃ gradually, insulation 1h; Then move in the Muffle furnace again, be warming up to 260 ℃ of modification by calcination gradually, roasting time is 0.8h; Treat that grinding 300 orders after the nature cooling sieves, promptly prepare can adsorpting lead ion special-purpose adsorbent.
Embodiment 4
Take by weighing natural kaolin 100 grams, after tentatively being ground into powder, place the china bowl of 500ml, add the aluminum sulfate (Al of 18 grams
2(SO
4)
3.18H
2O), after mixing, progressively add distilled water, the limit edged stirs, and makes it become pasty mixture; After this pasty mixture left standstill 30min, move in the constant temperature oven and be warming up to 100 ℃ gradually, insulation 1h; Then move in the Muffle furnace again, be warming up to 270 ℃ of modification by calcination gradually, roasting time is 1.8h; Treat that grinding 300 orders after the nature cooling sieves, promptly prepare can adsorpting lead ion special-purpose adsorbent.
Claims (5)
1, a kind of aluminum sulfate that utilizes carries out the method that modification prepares adsorbents for lead ion pyrolytic to natural kaolin, it is characterized in that taking by weighing natural kaolin, after tentatively being ground into powder, the aluminum sulfate of adding, after fully mixing, add distilled water again and stir and make it become pasty mixture; After leaving standstill, place constant temperature oven to be incubated 1h earlier; Then move into and carry out modification by calcination in the Muffle furnace, roasting time is 0.5～1.8h; Treat that grinding 300 orders after nature cools off sieves.
2, the aluminum sulfate that utilizes according to claim 1 carries out the method that modification prepares adsorbents for lead ion pyrolytic to natural kaolin, and the aluminum sulfate addition that it is characterized in that described adding is according to natural kaolin: aluminum sulfate is that 10: 1.8～3.2 part by weight adds.
3, the aluminum sulfate that utilizes according to claim 1 carries out the method that modification prepares adsorbents for lead ion pyrolytic to natural kaolin, it is characterized in that described is 20～30min with this pasty mixture time of repose.
4, the aluminum sulfate that utilizes according to claim 1 carries out the method that modification prepares adsorbents for lead ion pyrolytic to natural kaolin, and the temperature when it is characterized in that being incubated in the described temperature baking oven is 85～110 ℃.
5, the aluminum sulfate that utilizes according to claim 1 carries out the method that modification prepares adsorbents for lead ion pyrolytic to natural kaolin, and the temperature that it is characterized in that carrying out in the described Muffle furnace modification by calcination is 245 ℃～285 ℃.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102423700A (en) * | 2011-10-17 | 2012-04-25 | 湖南大学 | Method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt |
| CN102786818A (en) * | 2012-06-29 | 2012-11-21 | 赵曰浩 | Method for whitening kaolin by using surface cladding method |
| CN104556081A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Modified kaolin as well as preparation method and application thereof |
| CN106552585A (en) * | 2016-12-02 | 2017-04-05 | 郑州源冉生物技术有限公司 | Heavy metal lead ion adsorbent prepared by a kind of utilization Cortex Ailanthi and preparation method thereof |
| CN106552579A (en) * | 2017-01-07 | 2017-04-05 | 北京源清益壤环保科技有限公司 | For removing modified kaolin adsorbent of lead in polluted-water and preparation method thereof |
| CN106732354A (en) * | 2016-12-02 | 2017-05-31 | 郑州源冉生物技术有限公司 | A kind of heavy metal lead ion adsorbent and preparation method thereof |
| CN112266041A (en) * | 2020-11-02 | 2021-01-26 | 江西省环境保护科学研究院 | Water purification material with kaolin as matrix and preparation method and application thereof |
-
2009
- 2009-05-06 CN CN200910111661A patent/CN101543767A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102423700A (en) * | 2011-10-17 | 2012-04-25 | 湖南大学 | Method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt |
| CN102423700B (en) * | 2011-10-17 | 2013-09-25 | 湖南大学 | Method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt |
| CN102786818A (en) * | 2012-06-29 | 2012-11-21 | 赵曰浩 | Method for whitening kaolin by using surface cladding method |
| CN102786818B (en) * | 2012-06-29 | 2014-02-19 | 赵曰浩 | Method for whitening kaolin by using surface cladding method |
| CN104556081A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Modified kaolin as well as preparation method and application thereof |
| CN104556081B (en) * | 2013-10-28 | 2016-05-04 | 中国石油化工股份有限公司 | A kind of modified kaolin and its preparation method and application |
| CN106552585A (en) * | 2016-12-02 | 2017-04-05 | 郑州源冉生物技术有限公司 | Heavy metal lead ion adsorbent prepared by a kind of utilization Cortex Ailanthi and preparation method thereof |
| CN106732354A (en) * | 2016-12-02 | 2017-05-31 | 郑州源冉生物技术有限公司 | A kind of heavy metal lead ion adsorbent and preparation method thereof |
| CN106552579A (en) * | 2017-01-07 | 2017-04-05 | 北京源清益壤环保科技有限公司 | For removing modified kaolin adsorbent of lead in polluted-water and preparation method thereof |
| CN112266041A (en) * | 2020-11-02 | 2021-01-26 | 江西省环境保护科学研究院 | Water purification material with kaolin as matrix and preparation method and application thereof |
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Open date: 20090930 |