CN104096532A - Application of magadiite in adsorption of heavy metal ions - Google Patents
Application of magadiite in adsorption of heavy metal ions Download PDFInfo
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- CN104096532A CN104096532A CN201410270666.9A CN201410270666A CN104096532A CN 104096532 A CN104096532 A CN 104096532A CN 201410270666 A CN201410270666 A CN 201410270666A CN 104096532 A CN104096532 A CN 104096532A
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Abstract
The invention discloses application of magadiite in adsorption of heavy metal ions. The method for adsorption of heavy metal ions by magadiite provided by the invention includes: dissolving synthesized magadiite with a pH value of 8-9 in deionized water, dropping a proper amount of acid into the solution to make the solution neutral, conducting filtering and drying, then performing grinding to obtain powder, and adding the powder into a heavy metal solution. According to the invention, magadiite is adopted as an adsorbent for zinc ions, lead ions, chromium ions and cadmium ions in wastewater. Compared with other layered silicate adsorbents, magadiite has the advantages of no need for special pretreatment, low cost, and simple operation. Magadiite has excellent adsorption performance on toxic heavy metal ions at normal temperature, and can reach adsorption equilibrium within a short time. Through comprehensive consideration of the raw material cost, the treatment cost and the adsorption performance, the magadiite adsorbent has great potential practical application value.
Description
Technical field
The present invention relates to the application of adsorbent in Adsorption of Heavy Metal Ions, be specifically related to the application of magadiite in Adsorption of Heavy Metal Ions.
Background technology
Zinc ion, lead ion, chromium ion and cadmium ion are the elements that industrial quarters is often used.Along with the development of industrial technology, it is day by day serious that the heavy-metal pollution in industrial wastewater becomes.Its soluble salt makes ocean, rivers, farmland of occurring in nature etc. enjoy pollution along with the discharge of sewage, and may enter human body by the enrichment of food chain.If do not controlled, will threaten the mankind's healthy and existence.
At present, the method for processing heavy-metal pollution both at home and abroad has a variety of, as chemical precipitation method, hyperfiltration, electroosmose process and absorption method etc.Chemical precipitation method is generally used for the heavy metal ion of absorption high concentration, and need focus on, and is not suitable for the purification of low-concentration heavy metal ions; Reverse osmosis method need to be used permeable membrane, and permeable membrane is very expensive and easily broken, and cost is high; Although electroosmose process adsorption efficiency is high, need to consume very high electric energy, cost is also higher.And absorption method not only has economy, the advantage such as simple, processing low-concentration heavy metal ions and be often subject to the shortcoming of the restriction of process conditions and cost of material but also can overcome additive method.In numerous adsorbents, silicates mineral have abundant raw material, with low cost, advantages of environment protection and receive much concern with it again.But most silicate mineral adsorbents need to pass through complicated modification, just can reach instructions for use, this has just increased cost, has a greatly reduced quality to its cheap property.As modification infusorial earth [Luo Daocheng, Liu Junfeng. modification infusorial earth is to Pb in waste water
2+, Cu
2+, Zn
2+the research of absorption property. Chinese Mining Industry .2005,14 (7), 69-71] and modified alta-mud [Li Hujie, Liu Aiping, Yi Chengfa, Bai Ping. bentonite is to Cd
2+suction-operated and influence factor. Chinese Mining Industry .2004,13 (11), 79-81.] and PERFORMANCE OF MODIFIED VERMICULITE [Liu Yun, Wu Pingxiao, Dang Zhi. the experimental study of pillared vermiculite Adsorption heavy metal ions in wastewater. Minerals And Rocks .2006,26 (4), 8-13.] for to the isoionic absorption of zinc ion, lead ion, copper ion and chromium ion.Therefore find a kind of with low costly, pretreatment is easy, and adsorption rate silicates adsorbent high and that can adsorb contents of many kinds of heavy metal ion is very necessary.
Summary of the invention
Object of the present invention is mainly to overcome deficiency of the prior art, and the application of magadiite in Adsorption of Heavy Metal Ions is provided.
For achieving the above object, the technical solution used in the present invention is as follows.
The magadiite deionized water dissolving that is 8-9 by pH value, splashing into acid, to make solution be neutral, filter, dry after grind into powder join containing in heavy metal water body; Described heavy metal ion comprises more than one in zinc ion, lead ion, chromium ion and cadmium ion; Described heavy metal ion exists with the form of soluble salt or slightly soluble salt.
Preferably, described is normal temperature containing heavy metal water temperature.
Preferably, described heavy metal Heavy Metals in Waters ion initial concentration scope is 0.5～10000mg/L.
Preferably, described heavy metal water body, for containing heavy metal ion solution, adds magadiite after heavy metal ion solution adsorption time 30-60 minute.
Preferably, magadiite is added containing after heavy metal ion solution, adjusting water pH value is 5-7.
The method of magadiite Adsorption of Heavy Metal Ions of the present invention, adopts static adsorptive method, and the detecting step of its adsorption rate is as follows:
Use after magadiite Adsorption of Heavy Metal Ions, filter, in filtrate, residual concentration of heavy metal ion adopts atomic spectrophotometer to measure, and then calculates the adsorption rate of adsorbent according to (1) formula, calculates the adsorption capacity of heavy metal ion according to formula (2).
Q: heavy metal ion adsorbed rate;
Q: the adsorption capacity (mg/g) of heavy metal ion;
C
0: initial concentration of heavy metal ion (mg/L);
C: residual concentration of heavy metal ion (mg/L) after absorption;
V: containing heavy metal ion liquor capacity (mL);
W: the weight (g) that adds magadiite.
Adsorption rate while adsorbing certain density heavy metal ion according to magadiite and adsorption capacity are over time, can draw out the time dependent relation curve of adsorption rate and adsorption capacity, thus obtained equilibration time can characterize the absorption speed degree of ABSORBENTS ABSORPTION metal ion.
Compared with prior art, tool of the present invention has the following advantages and technique effect: magadiite in the time of Adsorption of Heavy Metal Ions without special pre-treatment, with low cost, simple to operate, just poisonous heavy metal ion is had to good absorption property at normal temperatures, in the short time, can arrive adsorption equilibrium.In the time processing the zinc ion, lead ion, chromium ion of low concentration or cadmium ion, adsorption rate is up to 100%.Consider cost of material, processing cost and absorption property, magadiite adsorbent has very large potential actual application value.
Brief description of the drawings
Fig. 1 is the affect figure of the measured adsorption time of embodiment 1 on zinc ion absorption property, and wherein solid line is Zn (II) adsorption rate (%), and dotted line is Zn (II) adsorption capacity (mg/g);
Fig. 2 is the affect figure of the measured adsorption time of embodiment 4 on lead ion absorption property, and wherein solid line is Pb (II) adsorption rate (%), and dotted line is Pb (II) adsorption capacity (mg/g);
Fig. 3 is the affect figure of the measured adsorption time of embodiment 5 on chromium ion absorption property, and wherein solid line is Cr (III) adsorption rate (%), and dotted line is Cr (III) adsorption capacity (mg/g);
Fig. 4 is the affect figure of the measured adsorption time of embodiment 6 on cadmium ion adsorption, and wherein solid line is Cd (II) adsorption rate (%), and dotted line is Cd (II) adsorption rate (%).
Detailed description of the invention
Below by embodiment in detail the present invention is described in detail, but protection scope of the present invention is not limited to these embodiment.
It is by [the dagger-axe Chen Meng that becomes clear that the present invention's wheat hydroxyl silicon used is received stone, the preparation of magadiite and sign. silicate journal .2013,41 (12), 1704-1708] in method synthetic, wherein n (SiO2): n (NaOH+Na2CO3): n (H2O)=5:1:100, crystallization temperature and time are respectively 160 DEG C and 36h.
Embodiment 1
Get 0.050g magadiite and put in the 50mL zinc nitrate solution that initial concentration is 20mg/L at normal temperatures stirring and adsorbing 30 minutes, after filtration, by residual zinc ion content in atomic spectrophotometer measurement solution, result shows, under this kind of situation, adsorption rate is 98%, and adsorption capacity is 19.6mg/g.Under similarity condition, change adsorption time 5 minutes, 10 minutes, 20 minutes, 60 minutes, 120 minutes respectively, gained adsorption rate is respectively 84%, 89%, 94%, 100%, 100%, and adsorption capacity data refer to table 1.
As can be seen from Figure 1, adsorption rate and adsorption capacity all first significantly increase with the increase of adsorption time at 0-30min, increase afterwards more slow, in 60min, reach 100% adsorption equilibrium, until adsorption equilibrium is not broken when 120min, illustrate that absorption is later very stable, do not separate suction phenomenon and occur, can obtain thus magadiite absorption initial concentration and be 20mg/L zinc ion time, the equilibrium adsorption time is 60 minutes.
The impact of table 1 adsorption time on zinc ion absorption property
Embodiment 2
Get 0.050g magadiite and put in the 50mL zinc nitrate solution that pH=7, initial concentration are 20mg/L at normal temperatures stirring and adsorbing 60 minutes, after filtration, by residual zinc ion content in atomic spectrophotometer measurement solution, result shows, under this kind of situation, adsorption rate is 100%, and adsorption capacity is 20.0mg/g.Under similarity condition, change pH difference 2,3,4,5,6, gained adsorption rate is respectively 68%, 80%, 90%, 99%, 100%, and adsorption capacity data refer to table 2.
Can obtain thus magadiite absorption initial concentration and be 20mg/L zinc ion time, optimal pH is 5-7.
The impact of table 2 pH on zinc ion absorption property
Embodiment 3
Get 0.050g magadiite and put in the 50mL zinc nitrate solution that initial concentration is 20mg/L at normal temperatures stirring and adsorbing 60 minutes, after filtration, by residual zinc ion content in atomic spectrophotometer measurement solution, result shows, under this kind of situation, adsorption rate is 100%, and adsorption capacity is 20mg/g.Under similarity condition, change magadiite consumption 0.025,0.100,0.200,0.400 minute respectively, gained adsorption rate is respectively 94%, 100%, 100%, 100%, 100%, and adsorption capacity data refer to table 3.
Can obtain thus magadiite absorption initial concentration and be 20mg/L zinc ion time, the optimum value of adsorbent addition is 0.050g.
The impact of table 3 adsorbent addition on zinc ion absorption property
Embodiment 4
Get 0.05g magadiite and put in the 50mL lead nitrate solution that initial concentration is 20mg/L at normal temperatures stirring and adsorbing 30 minutes, after filtration, with residual lead ion content in atomic spectrophotometer measurement solution, result shows, under this kind of situation, adsorption rate is 100%, and adsorption capacity is 20.0mg/g.Under similarity condition, change adsorption time 5 minutes, 10 minutes, 20 minutes, 60 minutes, 120 minutes respectively, gained adsorption rate is respectively 86%, 90%, 96%, 100%, 100%, and adsorption capacity data refer to table 4.
As can be seen from Figure 2, increase in time of adsorption rate and adsorption capacity and significantly increasing, reaches 100% absorption to 30min, until be in adsorption equilibrium state when 120min always, does not separate suction phenomenon to occur, and illustrate after adsorbing stable especially.Can obtain thus, when magadiite absorption initial concentration is 20mg/L zinc ion, the equilibrium adsorption time is 30 minutes.
The impact of table 4 adsorption time on lead ion absorption property
Embodiment 5
Get 0.05g magadiite and put in the 50mL chromium nitrate solution that initial concentration is 20mg/L at normal temperatures stirring and adsorbing 30 minutes, after filtration, with residual content of chromium ion in atomic spectrophotometer measurement solution, result shows, under this kind of situation, adsorption rate is 97%, and adsorption capacity is 19.4mg/g.Under similarity condition, change adsorption time 5 minutes, 10 minutes, 20 minutes, 60 minutes, 120 minutes respectively, gained adsorption rate is respectively 82%, 87%, 93%, 100%, 100%, and adsorption capacity data refer to table 5.
As can be seen from Figure 3, adsorption rate and adsorption capacity significantly increase with the increase of adsorption time at 0-30min, its increasing degree slows down gradually afterwards, in the time of 60min, reach 100% absorption, until be in adsorption equilibrium state when 120min always, do not separate suction phenomenon and occur, illustrate that absorption is later stable especially.Can obtain thus, when magadiite absorption initial concentration is 20mg/L chromium ion, the equilibrium adsorption time is 60 minutes.
The impact of table 5 adsorption time on chromium ion absorption property
Embodiment 6
Get 0.05g magadiite and put in the 50mL cadmium nitrate solution that initial concentration is 20mg/L at normal temperatures stirring and adsorbing 30 minutes, after filtration, with residual cadmium ion content in atomic spectrophotometer measurement solution, result shows, under this kind of situation, adsorption rate is 94%, and adsorption capacity is 18.8mg/g.Under similarity condition, change adsorption time 5 minutes, 10 minutes, 20 minutes, 60 minutes, 120 minutes respectively, gained adsorption rate is respectively 79%, 82%, 88%, 100%, 100%, and adsorption capacity data refer to table 6.
As can be seen from Figure 4, adsorption rate and adsorption capacity significantly increase with the increase of adsorption time at 0-30min, its increasing degree slows down gradually afterwards, in the time of 60min, reach 100% absorption, until be in adsorption equilibrium state when 120min always, do not separate suction phenomenon and occur, illustrate that absorption is later stable especially.Can obtain thus, when magadiite absorption initial concentration is 20mg/L cadmium ion, the equilibrium adsorption time is 60 minutes.
The impact of table 6 adsorption time on cadmium ion adsorption
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.All any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in the protection domain of the claims in the present invention.
Claims (5)
1. the application of magadiite in Adsorption of Heavy Metal Ions, is characterized in that, the magadiite deionized water dissolving that is 8-9 by pH value, splashing into acid, to make solution be neutral, filter, dry after grind into powder join containing in heavy metal water body; Described heavy metal ion comprises more than one in zinc ion, lead ion, chromium ion and cadmium ion; Described heavy metal ion exists with the form of soluble salt or slightly soluble salt.
2. the application of magadiite according to claim 1 in Adsorption of Heavy Metal Ions, is characterized in that, described is normal temperature containing heavy metal water temperature.
3. the application of magadiite according to claim 1 in Adsorption of Heavy Metal Ions, is characterized in that, described heavy metal Heavy Metals in Waters ion initial concentration scope is 0.5～10000mg/L.
4. the application of magadiite according to claim 1 in Adsorption of Heavy Metal Ions, is characterized in that, described heavy metal water body, for containing heavy metal ion solution, adds magadiite after heavy metal ion solution adsorption time 30-60 minute.
5. the application of described magadiite according to claim 4 in Adsorption of Heavy Metal Ions, is characterized in that, magadiite is added containing after heavy metal ion solution, and adjusting water pH value is 5-7.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108579664A (en) * | 2018-05-15 | 2018-09-28 | 华南理工大学 | Magnetic nanometer composite material and its preparation method and application based on two-dimensional layer material magadiite |
| CN111514848A (en) * | 2020-04-29 | 2020-08-11 | 贵州大学 | Preparation and application of amino-modified aluminum magadiite selective adsorption material |
| CN113277591A (en) * | 2021-06-08 | 2021-08-20 | 哈尔滨工程大学 | Method for removing heavy metal ions in water by using magadiite/graphene oxide nanosheet compound |
-
2014
- 2014-06-17 CN CN201410270666.9A patent/CN104096532A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108579664A (en) * | 2018-05-15 | 2018-09-28 | 华南理工大学 | Magnetic nanometer composite material and its preparation method and application based on two-dimensional layer material magadiite |
| WO2019218608A1 (en) * | 2018-05-15 | 2019-11-21 | 华南理工大学 | Magnetic nano composite material based on two-dimensional layered material magadiite, and preparation method and application thereof |
| CN111514848A (en) * | 2020-04-29 | 2020-08-11 | 贵州大学 | Preparation and application of amino-modified aluminum magadiite selective adsorption material |
| CN113277591A (en) * | 2021-06-08 | 2021-08-20 | 哈尔滨工程大学 | Method for removing heavy metal ions in water by using magadiite/graphene oxide nanosheet compound |
| CN113277591B (en) * | 2021-06-08 | 2022-06-17 | 哈尔滨工程大学 | Preparation method of two-dimensional magadiite/graphene oxide nanosheet composite |
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Application publication date: 20141015 |