CN107159146A - Stalk adsorbent for heavy metal based on lactic modified and its preparation method and application - Google Patents
Stalk adsorbent for heavy metal based on lactic modified and its preparation method and application Download PDFInfo
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- CN107159146A CN107159146A CN201710458457.0A CN201710458457A CN107159146A CN 107159146 A CN107159146 A CN 107159146A CN 201710458457 A CN201710458457 A CN 201710458457A CN 107159146 A CN107159146 A CN 107159146A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The present invention provides a kind of stalk adsorbent for heavy metal based on lactic modified and its preparation method and application.The present invention is first pre-processed using NaOH to stalk, then it is modified, by lactic modified, carboxyl is introduced into cellulose using lactic acid aqueous solution, substantially increase oxygen element and carboxyl-content, so as to significantly improve the adsorption rate of stalk heavy metal particularly copper, lead.Preparation method of the present invention is simple, cheap, modifying process need not introduce poisonous and harmful chemical reagent, wherein modifying agent lactic acid is cheap, personnel health will not be damaged during modification, the adsorbent prepared will not also produce new pollutant when being handled for heavy metal polluted waste water and enter water body；Simultaneously as modified stalk and water insoluble, after treating that batch liquid waste processing is complete, is easily collected and is focused on.
Description
Technical field
Field, specially a kind of straw based on lactic modified are administered the present invention relates to Phytochemistry and heavy metal polluted waste water
Stalk adsorbent for heavy metal and its preparation method and application.
Background technology
Substantial amounts of industry and mining wastewater are discharged into water environment, have triggered a series of environmental problem.In these waste water, most
Commonly heavy metal contaminants are including Cu, Pb etc., and these heavy metals can also be made even if micro to environmental ecology and health
Into infringement.Wherein Cu, Pb are mainly derived from mining, smelting, plating, synthetic rubber, cable and electronic components fabrication, battery system
Make, the industry such as pigment, paint, plastic manufacturing, strong with persistence, difficult degradation is easily enriched with by food chain, toxicity greatly,
It is micro can threat to life the features such as.Just because of the enrichment and bio-toxicity of heavy metal, heavy metal is listed in primary dirt
Contaminate thing.Cu can damage intestines and stomach and central nervous system after entering human body by destroying membrane integrity, cause dermatitis, kidney to damage
Wound, hemolytic jaundice, kidney failure etc., can also be carcinogenic when serious.Pb is the function by inhibitory enzyme, the synthesis infringement bone of interferases
Hemopoietic system and nervous system, cause anaemia, children's hyperkinetic syndrome, ataxia, central nervous system dysfunction, hypertension etc.
Problem.
A variety of harm based on heavy metal, related factories could be discharged after waste liquid must being carried out into system processing.Conventional
Processing method has：Chemical precipitation method, chemistry redox method, ion-exchange, membrane separation process, electrochemical process, charcoal absorption
And biosorption process etc..Although these methods are widely used in industrial practice, but there is cost height, are also easy to produce chemical dirt
Mud and for concentration less than 100mg/l heavy metal ion for, effect is not very undesirable on the contrary.Therefore, new processing is found
Method is extremely urgent.
Stalk is the accessory substance in production estimation process, and annual yield is huge.China is used as large agricultural country, straw
The processing disposal of stalk always is troublesome problem.Although the green circulatory for the stalk that responding to the call always is utilized, due to it is economical,
Many factors such as technology limit the utilization of stalk all the time so that its utilization rate is relatively low.Comprehensive Technological research both domestic and external
As a result, in terms of the purposes of stalk is primarily used to the energy, feed, returning to the field and material.In recent years, stalk is in terms of heavy metal adsorption
Larger progress is achieved, the recycling of stalk is caused extensive concern.Stalk is used as a kind of new biological suction
Attached dose, with the features such as cost is low, renewable, effect is good, yield is big, its essential element composition is C, H, O, N, primary chemical knot
Structure is the crude fibres such as cellulose, hemicellulose and lignin, rich in carbonyl, carboxyl, hydroxyl, amino etc. have complexing power and from
The active function groups of sub- exchange capacity.At the same time, stalk belongs to porous material, with larger surface area, therefore counterweight
Metal has comparatively ideal suction-operated.To further enhance the adsorption effect of its heavy metal, modification is improved to stalk
Research turns into study hotspot, and such as Hu Zhendong is reported to be changed using NaOH pretreatments and potassium permanganate oxidation to rice straw
Property, and then for the absorption (absorption property of Hu Zhendong, Yang Ying, Zhao Qing modified straw stalk heavy metal lead of heavy metal lead
Study [J] Anhui Jianzhu University journal, 2016,24 (2):51-58.)；Chen Suhong have studied the cellulose of maize straw point
Associative key in subchain is opened, and introduces new functional group, changes the intrinsic characteristic of cellulose, so as to prepare to hexavalent chromium
The plain class adsorbent of corn stalk fiber with compared with high-adsorption-capacity (modification of the red maize straws of Chen Su and its to Cr VI from
Research [D] the Shandong University of sub- absorption property, 2012.)；Fourth poplar etc. reports by modifying agent of hydrochloric acid and rice straw is carried out
It is modified, and then (fourth poplar, Zhang Lixin, Quan Yue wait hydrochloric Acid Modifications rice straw to Cr (VI) to carrying out absorption research to Cr (VI)
Absorption research [J] Agriculture of Anhui science, 2014 (31):11055-11057.).However, above-mentioned study on the modification generally existing changes
Property agent valency chromium it is higher or, method of modifying is complicated cumbersome, modified adsorbent heavy metal adsorption effect lifting, which is not substantially waited, to be lacked
Point, it is therefore desirable to be modified and further studied to stalk.
The content of the invention
For above-mentioned the deficiencies in the prior art, it is heavy metal ion adsorbed that the present invention provides a kind of stalk based on lactic modified
Agent and its preparation method and application.The present invention is first pre-processed using NaOH to stalk, is then carried out using lactic acid aqueous solution
It is modified, by lactic modified, carboxyl is introduced into cellulose, hence it is evident that increase oxygen element and carboxyl-content, so as to significantly improve straw
Stalk heavy metal is particularly the adsorption rate to ion of copper and lead.
Specifically, technical scheme is as follows：
The first aspect of the present invention discloses lactic acid being modified stalk to prepare stalk adsorbent for heavy metal
In application.
The second aspect of the invention, discloses the preparation side of the stalk adsorbent for heavy metal based on lactic modified
Method, including：
(1) stir process in NaOH solution is placed in after stalk is smashed；
(2) stalk after being handled through step (1) is placed in stir process in lactic acid solution to obtain stalk heavy metal ion adsorbed
Agent.
It is preferred that, stalk is pre-processed before stalk smashing in the step (1), the pretreatment mode is to use water
Stalk is cleaned and dried, it is further preferred that the drying temperature is 60 DEG C；
It is preferred that, stalk, which is smashed to particle diameter, in the step (1) is less than or equal to 0.2mm, stalk is smashed, so as to effectively increase
The big specific surface area of stalk, while being also beneficial to subsequently fully contact with modifying agent, finally product is prepared so as to improve
Heavy metal adsorption efficiency；But smashing particle diameter is smaller, its manpower and materials expends bigger, and inventor gropes by constantly experiment, most
Determine to smash stalk to particle diameter eventually to be less than or equal to 0.2mm, you can reach splendid heavy metal adsorption rate；
It is preferred that, NaOH concentration is 0.5~2mol/L (optimal is 1mol/L) in the step (1), and stir process is specific
Condition is：Rotating speed is 180-220rpm (optimal is 200rpm), and processing time is 1.5~3h (optimal is 2h)；
It is preferred that, the stalk after NaOH is handled in the step (2), which is placed in before lactic acid solution, is first placed in water stalk
Washing, treats that water lotion, in neutrality, stalk is taken out and dried；The NaOH remained on stalk is removed, itself and follow-up lactic acid is prevented
Reaction；
It is preferred that, lactic acid solution concentration is 0.2~0.5mol/L (optimal is 0.3mol/L) in the step (2), stirring
Handling actual conditions is：Rotating speed is 180-220rpm (optimal is 200rpm), and processing time is 1.5~3h (optimal is 2h)；
It is preferred that, the stalk after being handled in the step (2) through lactic acid solution is placed in water washing, in treating that water lotion is in
Property, stalk is taken out and dries to obtain stalk adsorbent for heavy metal；
It is preferred that, the preparation method of the stalk adsorbent for heavy metal based on lactic modified, including：
(1) stalk after cleaning, drying is smashed to particle diameter and is less than or equal to 0.2mm, be subsequently placed in 1mol/L NaOH solution
In be stirred 2h, rotating speed is 200rpm, and stalk is placed in water into washing after pending end, treat water lotion in neutrality,
Stalk is taken out and dried；
(2) stalk handled through step (1) is placed in 0.3mol/L lactic acid aqueous solution and is stirred 2h, rotating speed
For 200rpm, stalk is placed in water washing after pending end, treats that stalk, in neutrality, is taken out drying stalk by water lotion
Adsorbent for heavy metal.
The third aspect of the present invention, discloses the stalk adsorbent for heavy metal that above-mentioned preparation method is prepared.Hair
Person of good sense's research is found, first stalk is pre-processed using NaOH, so as to break the hydrogen bond in stalk between cellulosic molecule, changed
Kind microcellular structure, increase porosity and specific surface area, improve heavy metal adsorption rate；Meanwhile, NaOH solution can also moisten a fiber
Element so that the hydroxyl held onto in cellulose is more exposed, and facilitates the introducing of follow-up hydroxyl；And subsequently entered using lactic acid
Row is modified, and its object is to utilize esterification, carboxyl is introduced into cellulose, increase oxygen element and carboxyl-content, so that aobvious
Write the adsorption efficiency for improving the stalk adsorbent for heavy metal heavy metal prepared.
The fourth aspect of the present invention, discloses above-mentioned stalk adsorbent for heavy metal and is controlled in heavy metal pollutant effluents
Heavy metal in application in reason, the heavy metal polluted waste water is copper and/or lead.
It is preferred that, the application specific method is：Above-mentioned stalk adsorbent for heavy metal is placed in into heavy metal pollution to give up
2h is stirred in water, rotating speed is 150rpm, the adsorbent dosage is 6g/L；
Wherein, heavy metal polluted waste water pH controls are 5~5.5, and heavy metal concentration is less than or equal to 100mg/L.
Beneficial effects of the present invention：
(1) present invention is modified lactic acid as modifying agent to stalk first, meanwhile, it is further to improve it to be modified effect
Really, stalk is handled using sodium hydroxide in advance, by continuing to optimize adjusting parameter, finally prepares heavy metal dirty
Dye waste water has the stalk adsorbent for heavy metal of notable adsorption effect, experiment proves that, the stalk that the present invention is prepared
60% and 25% are respectively increased to the clearance of copper and lead before adsorbent for heavy metal is more unmodified, adsorption rate is significantly carried
It is high；
(2) preparation method of the present invention is simple, cheap, and modifying process need not introduce poisonous and harmful chemical reagent, wherein changing
Property agent lactic acid it is cheap, personnel health will not be damaged during modification, the adsorbent prepared be used for heavy metal
New pollutant, which will not be also produced, during pollutant effluents processing enters water body；Simultaneously as modified stalk and water insoluble, is treated
After batch liquid waste processing is complete, is easily collected and focused on.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
Be also intended to include plural form, additionally, it should be understood that, when in this manual use term "comprising" or " comprising "
When, it indicates existing characteristics, step, operation, device, component or combinations thereof.
As background technology is introduced, stalk is modified carries out heavy metal wastewater thereby absorption regulation effect still not so far
It is good；
In view of this, in a kind of typical embodiment of the invention, disclose lactic acid being modified stalk to make
Application in standby stalk adsorbent for heavy metal.It should be noted that the present invention is wheat stalk from stalk.
In the another exemplary embodiment of the present invention, the stalk adsorbent for heavy metal based on lactic modified is disclosed
Preparation method, including：
(1) stir process in NaOH solution is placed in after stalk is smashed；
(2) stalk after being handled through step (1) is placed in stir process in lactic acid solution to obtain stalk heavy metal ion adsorbed
Agent.
Wherein, stalk is pre-processed before stalk smashing in the step (1), the pretreatment mode is will with water
Stalk is cleaned and dried, it is further preferred that the drying temperature is 60 DEG C；
Stalk, which is smashed to particle diameter, in the step (1) is less than or equal to 0.2mm, stalk is smashed, so as to increase effectively straw
The specific surface area of stalk, while being also beneficial to subsequently fully contact with modifying agent, so as to improve the final heavy metal for preparing product
Adsorption efficiency；But smashing particle diameter is smaller, its manpower and materials expends bigger, and inventor gropes by constantly experiment, finally determines
Stalk is smashed to particle diameter and is less than or equal to 0.2mm, you can splendid heavy metal adsorption rate is reached；
NaOH concentration is 0.5~2mol/L (optimal is 1mol/L) in the step (1), and stir process actual conditions is：
Rotating speed is 180-220rpm (optimal is 200rpm), and processing time is 1.5~3h (optimal is 2h)；
Stalk after NaOH is handled in the step (2) is placed in before lactic acid solution is first placed in water washing by stalk, treats
Stalk is taken out and dried in neutrality by water lotion；The NaOH remained on stalk is removed, prevents it from being reacted with follow-up lactic acid；
Lactic acid solution concentration is 0.2~0.5mol/L (optimal is 0.3mol/L) in the step (2), and stir process is specific
Condition is：Rotating speed is 180-220rpm (optimal is 200rpm), and processing time is 1.5~3h (optimal is 2h)；
Stalk after being handled in the step (2) through lactic acid solution is placed in water washing, water lotion is treated in neutrality, by stalk
Stalk adsorbent for heavy metal is dried to obtain in taking-up；
In the another exemplary embodiment of the present invention, the stalk adsorbent for heavy metal based on lactic modified is disclosed
Preparation method, including：
(1) stalk after cleaning, drying is smashed to particle diameter and is less than or equal to 0.2mm, be subsequently placed in 1mol/L NaOH solution
In be stirred 2h, rotating speed is 200rpm, and stalk is placed in water into washing after pending end, treat water lotion in neutrality,
Stalk is taken out and dried；
(2) stalk handled through step (1) is placed in 0.3mol/L lactic acid aqueous solution and is stirred 2h, rotating speed
For 200rpm, stalk is placed in water washing after pending end, treats that stalk, in neutrality, is taken out drying stalk by water lotion
Adsorbent for heavy metal.
In the another exemplary embodiment of the present invention, the stalk heavy metal ion that above-mentioned preparation method is prepared is disclosed
Adsorbent.
In the another exemplary embodiment of the present invention, above-mentioned stalk adsorbent for heavy metal is disclosed dirty in heavy metal
It is copper and/or lead to contaminate the heavy metal in the application in being administered in waste water, the heavy metal polluted waste water.
Wherein, the application specific method is：Above-mentioned stalk adsorbent for heavy metal is placed in heavy metal polluted waste water
In be stirred 2h, rotating speed is 150rpm；Heavy metal polluted waste water pH controls are 5~5.5, and heavy metal concentration is less than or equal to
100mg/L, the adsorbent dosage is 6g/L.
With reference to embodiment and comparative example, the present invention is described further.It should be noted that following specific realities
It is wheat stalk to apply in example and comparative example from stalk.
Embodiment 1
A kind of preparation method of the stalk adsorbent for heavy metal based on lactic modified, including：
(1) stalk after cleaning, drying (60 DEG C) is smashed to particle diameter and is less than or equal to 0.2mm, be subsequently placed in 1mol/L's
2h is stirred in NaOH solution, rotating speed is 200rpm, and stalk is placed in water into washing after pending end, water lotion is treated
In neutrality, stalk is taken out and dried；
(2) stalk handled through step (1) is placed in 0.3mol/L lactic acid aqueous solution and is stirred 2h, rotating speed
For 200rpm, stalk is placed in water washing after pending end, treats that stalk, in neutrality, is taken out drying stalk by water lotion
Adsorbent for heavy metal.
Embodiment 2
A kind of preparation method of the stalk adsorbent for heavy metal based on lactic modified, including：
(1) stalk after cleaning, drying (60 DEG C) is smashed to particle diameter and is less than or equal to 0.2mm, be subsequently placed in 0.5mol/L's
3h is stirred in NaOH solution, rotating speed is 200rpm, and stalk is placed in water into washing after pending end, water lotion is treated
In neutrality, stalk is taken out and dried；
(2) stalk handled through step (1) is placed in 0.5mol/L lactic acid aqueous solution and is stirred 2h, rotating speed
For 220rpm, stalk is placed in water washing after pending end, treats that stalk, in neutrality, is taken out drying stalk by water lotion
Adsorbent for heavy metal.
Embodiment 3
A kind of preparation method of the stalk adsorbent for heavy metal based on lactic modified, including：
(1) stalk after cleaning, drying (60 DEG C) is smashed to particle diameter and is less than or equal to 0.2mm, be subsequently placed in 2mol/L's
1.5h is stirred in NaOH solution, rotating speed is 180rpm, and stalk is placed in water into washing after pending end, waits to wash
Stalk is taken out and dried in neutrality by liquid；
(2) stalk handled through step (1) is placed in 0.2mol/L lactic acid aqueous solution and is stirred 3h, rotating speed
For 200rpm, stalk is placed in water washing after pending end, treats that stalk, in neutrality, is taken out drying stalk by water lotion
Adsorbent for heavy metal.
Comparative example 1
Preparation method be the same as Example 1, the difference is that only lactic acid solution concentration is 0.1mol/L；
Comparative example 2
Preparation method be the same as Example 1, the difference is that only lactic acid solution concentration is 1mol/L；
Comparative example 3
By the stalk after cleaning, drying (60 DEG C) smash to particle diameter less than or equal to 0.2mm obtain unmodified stalk heavy metal from
Sub- adsorbent.
Embodiment 1-3, comparative example 1-3 the stalk adsorbent for heavy metal prepared are placed in a heavy industries
Adsorption treatment is carried out in waste water, processing method is：Above-mentioned stalk adsorbent for heavy metal is respectively placed in into heavy metal pollution to give up
2h is stirred in water, rotating speed is 150rpm；Heavy metal polluted waste water pH is adjusted to 5~5.5, the adsorbent dosage
For 6g/L；Each content of beary metal is shown in Table 1 in waste water.
Content of beary metal (mg/L) in the heavy metal industrial effluent of table 1
| Composition | Cu2+ | Ni2+ | Pb2+ | Cd2+ | Total Cr |
| Concentration | 50.5 | 1.2 | 43.2 | 2.3 | 7.15 |
After pending end, take the waste water in each embodiment and comparative example group to carry out content of beary metal measure, calculate each heavy
Metal removal rate, the results are shown in Table 2.
The each group heavy metal removing rate (%) of table 2
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Cu2+ | 80% | 72% | 69% | 32% | 49% | 20% |
| Ni2+ | 55% | 50% | 51% | 47% | 52% | 51% |
| Pb2+ | 97% | 90% | 86% | 78% | 77% | 72% |
| Cd2+ | 43% | 42% | 35% | 32% | 38% | 39% |
| Total Cr | 51% | 49% | 47% | 48% | 43% | 46% |
As can be seen from Table 2, when heavy metal waste water carries out heavy metal adsorption using heavy metal absorbent, embodiment 1 is imitated
Fruit is optimal, meanwhile, the heavy metal absorbent prepared is more unmodified preceding to Cu2+、Pb2+Adsorption efficiency lifting is notable, embodiment
1 compared with comparative example 3 understand, it is to Cu2+Clearance improves 60%, to Pb2+Clearance improves 25%；But to other heavy metals
Such as Ni2+、Cd2+Unobvious with the adsorption efficiency such as total Cr lifting effect, this also reflects heavy metal adsorption effect and mechanism in fact
Complexity；In addition, making inventor feel surprised, lactic acid concn is to Cu2+、Pb2+Adsorption efficiency influence is obvious, is higher than
Or less than 0.3mol/L, can cause Cu2+、Pb2+Adsorption efficiency declines, and once deviates the preferred dense of lactic acid solution of the present invention
Degree, Cu2+、Pb2+Adsorption efficiency is then greatly lowered.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. lactic acid to stalk being modified to prepare the application in stalk adsorbent for heavy metal.
2. a kind of preparation method of the stalk adsorbent for heavy metal based on lactic modified, it is characterised in that including：
(1) stir process in NaOH solution is placed in after stalk is smashed；
(2) stalk after being handled through step (1) is placed in stir process in lactic acid solution and obtains stalk adsorbent for heavy metal.
3. preparation method as claimed in claim 2, it is characterised in that carried out in the step (1) before stalk is smashed to stalk
Pretreatment, the pretreatment mode is that stalk cleaned and dried (drying temperature is 60 DEG C) with water；The stalk is smashed
It is less than or equal to 0.2mm to particle diameter.
4. preparation method as claimed in claim 2, it is characterised in that NaOH concentration is 0.5~2mol/L in the step (1)
(being preferably 1mol/L), stir process actual conditions is：Rotating speed is 180-220rpm (be preferably 200rpm), and processing time is
1.5~3h (being preferably 2h).
5. preparation method as claimed in claim 2, it is characterised in that the stalk after NaOH is handled in the step (2) is placed in
Stalk is first placed in water washing before lactic acid solution, treats that water lotion, in neutrality, stalk is taken out and dried.
6. preparation method as claimed in claim 2, it is characterised in that in the step (2) lactic acid solution concentration be 0.2~
0.5mol/L (being preferably 0.3mol/L), stir process actual conditions is：Rotating speed is 180-220rpm (being preferably 200rpm), place
The reason time is 1.5~3h (being preferably 2h).
7. preparation method as claimed in claim 2, it is characterised in that the stalk after being handled in the step (2) through lactic acid solution
Washing is placed in water, treats that water lotion, in neutrality, stalk is taken out and dries to obtain stalk adsorbent for heavy metal.
8. preparation method as claimed in claim 2, it is characterised in that including：
(1) stalk after cleaning, drying is smashed to particle diameter and is less than or equal to enter in 0.2mm, the NaOH solution for being subsequently placed in 1mol/L
Row stir process 2h, rotating speed is 200rpm, and stalk is placed in water into washing after pending end, water lotion is treated in neutrality, by straw
Stalk takes out drying；
(2) stalk handled through step (1) is placed in 0.3mol/L lactic acid aqueous solution and is stirred 2h, rotating speed is
200rpm, washing is placed in water after pending end by stalk, treats that stalk, in neutrality, is taken out drying stalk weight by water lotion
Metal ion adsorbent.
9. the stalk adsorbent for heavy metal that any one of the claim 2-8 preparation methods are prepared.
10. stalk adsorbent for heavy metal described in claim 9 administered in heavy metal pollutant effluents in application, it is described
Heavy metal in heavy metal polluted waste water is copper and/or lead；
The application specific method is：The stalk adsorbent for heavy metal is placed in heavy metal polluted waste water and is stirred
2h is handled, rotating speed is 150rpm, the adsorbent dosage is 6g/L；
Wherein, heavy metal polluted waste water pH controls are 5~5.5, and heavy metal concentration is less than or equal to 100mg/L.
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| CN109550484A (en) * | 2018-11-20 | 2019-04-02 | 浙江海洋大学 | A kind of preparation method of instruction plant stem foot chromium ion adsorbent |
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| CN101811029A (en) * | 2010-05-25 | 2010-08-25 | 中南大学 | Adsorbent for treating heavy metal waste water and preparation method and application method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109550484A (en) * | 2018-11-20 | 2019-04-02 | 浙江海洋大学 | A kind of preparation method of instruction plant stem foot chromium ion adsorbent |
| CN109550484B (en) * | 2018-11-20 | 2021-08-10 | 浙江海洋大学 | Preparation method of invasive plant stem-based chromium ion adsorbent |
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Application publication date: 20170915 |