CN107413319B - The preparation of corncob modified magnetic heavy-metal adsorption material and the method for removing heavy metal in water removal - Google Patents
The preparation of corncob modified magnetic heavy-metal adsorption material and the method for removing heavy metal in water removal Download PDFInfo
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- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
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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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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Abstract
The invention discloses a kind of modified magnetic materials for removing removing heavy metals of corncob to prepare the minimizing technology with heavy metal in water, magnetic heavy metal adsorbent is prepared by carrying out physical and chemical modified to agricultural wastes corncob, to heavy metal removal ability with higher in dirty (useless) water, realize agricultural wastes resource utilization, with the purpose for pollution treatment of giving up, while the difficulty removed is difficult to after overcoming the application of conventional absorbtion material.The invention raw material sources are abundant, method simple possible, to heavy metals removal significant effect and stabilization in water, and prepare and adsorb low in cost, have preferable application value.
Description
Technical field
The invention belongs to contain heavy metal-polluted (useless) Water warfare field, in particular to a kind of modified removal weight of corncob
The minimizing technology of the magnetic material preparation and heavy metal in water of metal.
Background technique
With the fast development of industrial society, material processing, chemical production, Metal mining production with develop and it is daily
The discharge amount of heavy metal-containing waste water is increasing during production and living, and environmental pollution is got worse, and human health receives sternly
The threat of weight.How to eliminate the harm of heavy metal and effectively recycle the heavy metal in waste water, this is current environmental protection work
In face one very prominent, and problem in urgent need to solve.
Corncob is as the waste in agricultural production process, and amount is big and generally existing, and farm or peasant household are generally made
It burns or discards for fuel, either which kind of mode can all pollute the environment.If being recycled, it is developed into
Surrounding purifying material then realizes agricultural wastes resource utilization, with the purpose for pollution treatment of giving up.At present.Using corncob as original
Expect that someone studies to develop the technology of adsorbent processing heavy metal wastewater thereby, entitled " a kind of corncob modified material and its system
Preparation Method and application ", in the patent document of Publication No. CN104874361A, disclose using corncob as heavy metal ion
The preparation method of adsorbent, this method place into maize cob meal after the pretreatment of sodium hydroxide solution and nitric acid solution is impregnated
It is impregnated in water, initiator for reaction is then added and is purified to obtain corncob modified material after a certain period of time, to the Cu in waste water2 +、Cd2+、Pb2+Although ion has certain absorption property, low but there are adsorption efficiencies, adsorbent is difficult to the deficiencies of recycling.
CN105854834A discloses a kind of preparation method of modified corn core adsorbent, comprising the following steps: and it is 1) that corncob is dry,
It crushes, obtains maize cob meal；2) maize cob meal and silicate solution are mixed, while is passed through nitrogen up to the oxygen in exclusion system
Gas stirs 0.5~1h, then cools the temperature to 30 DEG C hereinafter, addition ammonium ceric nitrate and methyl acrylate progress graft copolymerization are anti-
1~2h is answered, hydroquinone stopped reaction is added, filtering is dry by filter cake acetone washing, as graft copolymer；3) Xiang Gan
Sodium hydroxide solution is added in dry graft copolymer, at 60~70 DEG C, ultrasonic wave 50,000~100,000 Hz, 200~500MPa into
Row 10~15h of saponification process, it is cooling, pH to 6~7 is adjusted, filtering is dry by filter cake acetone washing, as modified corn core
Adsorbent.However, this method needs graft copolymerization and row saponification process, preparation method is cumbersome, be unfavorable for it is extensive it is low at
This production adsorbent.
The present invention, as raw material, is changed using the agricultural wastes corncob being easily obtained by carrying out physical chemistry to it
Property, it obtains to containing Pb2+、Cu2+、Cd2+、Cr2+、Zn2+Etc. heavy metal ion have excellent removal ability magnetic absorption material
Material, has reached utilization of waste as resource, with the purpose for pollution treatment of giving up, reduces water process expense, while overcoming adsorbent material
Difficult problem is recycled, in addition wastewater treatment process risk without secondary pollution, meets the environmental protection concept of the treatment of wastes with processes of wastes against one another, has good
Social benefit and environmental benefit.
Summary of the invention
For the defect and deficiency of the material of current heavy metal polluted waste water processing, it is an object of the invention to utilize to be easy to
The agricultural wastes corncob of collection is raw material, by physical and chemical modified, to Pb2+、Cu2+、Cd2+、Cr2+、Zn2+Deng a huge sum of money
Belong to ion and all have higher removal efficiency, removal rate is adsorbed up to 98% or more, while after removing heavy metal ions in wastewater
Material recovery is convenient, and can effectively recycle the heavy metal in waste water.
In order to achieve the object of the present invention, inventor is finally obtained as follows by a large number of experiments research and unremitting effort
Technical solution: a kind of preparation method of corncob modified magnetic heavy-metal adsorption material, this method comprises the following steps:
(1) corncob is cleaned, is dried, crushed, cross 60~80 meshes, it is spare；
(2) step (1) pretreated maize cob meal is mixed with water by the weight ratio of 1:2~1:4, extremely with acid solution tune pH
3.7~4.5,1~1.5h of stirring or oscillation, being then adjusted to pH with lye is 10.5~11.5, continues to stir or vibrate
2.5-3.5 hours, it is centrifuged or filters off moisture, and be alternately washed till neutrality with water and ethyl alcohol, and dry in 60~80 DEG C；
(3) under inert gas protection by the intermediate of step (2) drying, in 450~550 DEG C of 1~2h of holding, after to temperature
Degree is down to room temperature taking-up, obtains modified corn core powder intermediate；
(4) water is added by the weight ratio of 1:2~1:3 in the modified corn core powder intermediate for obtaining step (3), stirs in band
With the closed of inert gas shielding and can be in heating in water bath for reaction system, under inert gas protection, bath temperature is maintained at 50
~60 DEG C, magnesium chloride is added by 18%~24% of weight among modified corn core powder in uniform stirring, it is stirred to react 5~
After 8min, molysite and ferrous salt is added, is stirred to react after 4-6min and adjusts pH immediately after 10~11,0.4~0.5h of reaction, it will
Bath temperature rise to 75~85 DEG C the reaction was continued it is cooling after 1.3~2.0h after be centrifuged or filtering, neutrality is washed till, at 60~80 DEG C
Lower drying, for use；
(5) under inert gas protection by the product after step (4) drying, in 430~480 DEG C of 1.5~2.5h of holding, i.e.,
Obtain corncob modified magnetic heavy-metal adsorption material.
It is further preferred that the preparation method of corncob modified magnetic heavy-metal adsorption material as described above, wherein step
(1) pre-treatment step specifically: corncob is rinsed well with clear water, moisture is filtered off and is dried in 60 DEG C~80 DEG C, smashed it through
60~80 meshes.
It is further preferred that the preparation method of corncob modified magnetic heavy-metal adsorption material as described above, wherein step
(2) acid solution described in is the nitric acid solution of mass fraction 2%~5%, and the lye is the hydrogen of mass fraction 5%~10%
Potassium oxide solution.
It is further preferred that the preparation method of corncob modified magnetic heavy-metal adsorption material as described above, wherein step
(2) it is 400~500 turns/min that speed when stirring is selected in, and selecting speed when oscillation is 200~260 turns/min.
It is further preferred that the preparation method of corncob modified magnetic heavy-metal adsorption material as described above, wherein step
(4) speed stirred in is 500~700 turns/min.
It is further preferred that the preparation method of corncob modified magnetic heavy-metal adsorption material as described above, wherein step
(4) total amount of molysite and ferrous salt is 30%~40% of weight among modified corn core powder in, and ferrous ion and iron from
Sub- molar ratio 1:(2.0~2.3).
In addition, by the obtained corncob modified magnetic heavy-metal adsorption material of the present invention by it is a certain amount of be separately added into it is leaded,
In heavy metal-polluted (useless) water such as zinc, cadmium, chromium, copper, pH under certain condition, react after a certain period of time by stirring and adsorbing, utilizes magnet
Recycle the adsorbent material.Method simple possible, recycling convenience, nothing two significant and stable to the removal effect of phosphorus in dirt (useless) water
Secondary pollution has achieved the purpose that with pollution treatment of giving up.
Therefore, weight in water removal is removed using above-mentioned corncob modified magnetic heavy-metal adsorption material the present invention also provides a kind of
The method of metal, specifically, this method comprises the following steps: the corncob modified magnetic heavy-metal adsorption material is pressed
Then plus magnetic the dosage of 2.0g/L~2.5g/L is added containing in heavy metal containing sewage, adjusts pH to 2~6,2~2.5h of stirring and adsorbing,
Iron recycles the adsorbent material.It is further preferred that the heavy metal includes one of lead, zinc, cadmium, chromium and copper or a variety of.
Still further preferably, when go water removal in heavy metal be lead, zinc, cadmium, chromium, copper when, adjust pH value be respectively 5,2,6,4,4.
A kind of jade that present invention corncob modified magnetic heavy-metal adsorption material obtained and Gong sage and Zhou Xinhua invent
Rice core modified material is compared: the modified preparation process of the present invention does not need initiator and monomer, therefore preparation process is simple to operation；
Secondly, the present invention obtain corncob modified magnetic heavy-metal adsorption material absorption to lead, zinc, cadmium, chromium, copper saturated extent of adsorption
Respectively 74~76mg/g, 73~74mg/g, 49~50mg/g, 49~50mg/g and 49~50mg/g, and to lead, zinc, cadmium,
Chromium, copper removal rate be 98.00%~99.99% and its more than, and Gong Yu sage and Zhou Xinhua adsorbent material obtained to lead,
Copper, cadmium saturated extent of adsorption be respectively 7.2~7.7mg/g, therefore adsorbent material its adsorbance that the present invention obtains is significantly larger than Gong
The material of holy and Zhou Xinhua invention；Third, the corncob modified magnetic heavy-metal adsorption material that the present invention obtains remove weight in water removal
Additional magnet is i.e. recyclable after metal reaction is complete, therefore is easily recycled, can be thoroughly by heavy metals removal in water.
Present invention corncob modified magnetic heavy-metal adsorption material obtained and the modified corn of Xie Songfen invention wick
Attached dose and its preparation method and application is compared: the modified preparation process of the present invention is not required to graft copolymerization and row saponification process, therefore
Preparation process is simple, reacts easily controllable；Secondly, the corncob modified magnetic heavy-metal adsorption material absorption pair that the present invention obtains
Leaded, zinc, cadmium, chromium, copper optimal initial concentration be respectively 150mg/L, 150mg/L, 100mg/L, 100mg/L and 100mg/L,
Optimal pH is respectively 5,2,6,4 and 4, adsorbent material optimal addn 2.000g/L~2.500g/L, and what Xie Songfen was invented changes
Property corncob adsorbent to lead, zinc, copper, nickel, cobalt initial concentration be respectively 2.51mg/L, 12.3mg/L, 5.8mg/L,
10.1mg/L and 15.3mg/L, the amount that adsorbent is added just reach 2.0g/L, therefore the absorption effect of adsorbent material that the present invention obtains
Fruit is better than the modified corn core adsorbent of Xie Songfen invention；Third, the corncob modified magnetic heavy metal adsorption that the present invention obtains
Material goes in water removal additional magnet after heavy metal react to can be recycled, therefore is easily recycled, can be thoroughly by heavy metals removal in water.
Compared with prior art, the present invention is prepared into magnetism by carrying out physical and chemical modified to agricultural wastes corncob
Heavy metal absorbent realizes agricultural wastes resource utilization to heavy metal removal ability with higher in dirty (useless) water,
With the purpose for pollution treatment of giving up, while the difficulty removed is difficult to after overcoming the application of conventional absorbtion material.The invention raw material sources are rich
Richness, preparation method simple possible to heavy metals removal significant effect and stabilization in water, and are prepared and are adsorbed low in cost, have
Preferable application value.
Specific embodiment
Absorption below by specific embodiment to corncob modified magnetic heavy-metal adsorption material of the present invention to heavy metal
Performance is clearly and completely described, and the following example is merely to illustrate the present invention, and should not be regarded as limiting model of the invention
It encloses.In addition, particular technique operating procedure or condition person are not specified in embodiment, equal described skills according to the literature in the art
Art or condition are carried out according to product description.Reagents or instruments used without specified manufacturer is that can pass through city
Purchase the conventional products obtained.
Embodiment 1: the preparation of corncob modified magnetic heavy-metal adsorption material
1, the corncob of collection is rinsed well, filters off moisture and is dried in 60 DEG C~80 DEG C, smashes it through 60~80 meshes,
It is spare.
2, maize cob meal pretreated in step 1 and water (are guaranteed into maize cob meal quilt by the mass ratio of 1:2~1:3
Water all impregnates) it is fitted into the reaction vessel of belt stirrer or in appropriate containers, its pH is adjusted to 4, In with 5% nitric acid
Stir or be placed in oscillator oscillation (260 turns/min) 1.2h under 450 turns/min speed, then with 10% potassium hydroxide tune
It is 11.0 to pH, continues stirring (450 turns/min) and perhaps vibrate (260 turns/min) subsequent centrifugation in 3 hours or filter off moisture,
And it alternately is washed till neutrality with water and ethyl alcohol, and dry in an oven in 60~80 DEG C of temperature.
3, by the chemical modification corncob intermediate after the final drying in step 2 in the inert gases such as nitrogen or argon gas
It is down to room temperature to temperature after 480 DEG C of holding 1.5h under protection to take out, for use.
4, water is added by the mass ratio of 1:2~1:3 in modified corn core powder intermediate obtained in step 3, is stirred in band
Mix and stir the closed of inert gas shielding and can in heating in water bath for reaction system, under the inert gas shieldings such as nitrogen or argon gas,
Bath temperature is maintained at 52 DEG C, and mixing speed keeps 600 turns/min uniform stirring, by weight among modified corn core powder
After 20% addition magnesium chloride is stirred to react 5min, molysite then is added and ferrous salt, molysite and ferrous salt total amount account for modified corn
The 33% of weight among core powder, and guarantee the ratio of ferrous ion and iron ion molar ratio 1:2, it is stirred to react after 5min immediately
PH is adjusted in 10~11 ranges, after reacting 0.5h, by its temperature rise to 80 DEG C the reaction was continued after 1.5h it is cooling after be centrifuged or
Filtering, lotion to neutrality are dried, for use at 60~80 DEG C.
5, by the product after being dried in step 4 under the inert gas shieldings such as nitrogen or argon gas, after 430 DEG C of holding 2h
Obtain corncob modified magnetic heavy-metal adsorption material.
Embodiment 2: the removal of heavy metal in dirty (useless) water
By the obtained corncob modified magnetic heavy-metal adsorption material of embodiment 1 by it is a certain amount of be separately added into leaded, zinc,
In heavy metal-polluted (useless) water such as cadmium, chromium, copper, pH under certain condition, react after a certain period of time by stirring and adsorbing, additional magnet recycling
The adsorbent material.
Experimental result shows, present invention corncob modified magnetic heavy-metal adsorption material obtained, leaded, zinc, cadmium,
Chromium, copper optimal initial concentration are respectively 150mg/L, 150mg/L, 100mg/L, 100mg/L and 100mg/L, and Optimal pH is respectively
5,2,6,4 and 4, optimal use temperature is room temperature, stirring rate 300~400 turns/min, 2~2.5h of uniform stirring, adsorbent material
Optimal addn 2.000g/L~2.500g/L, removal rate up to 98.00%~99.99%, distinguish by maximum saturation adsorbance
For 74~76mg/g, 73~74mg/g, 49~50mg/g, 49~50mg/g and 49~50mg/g, best and most economical use
Temperature is room temperature, to the removal rate of lead, zinc, cadmium, chromium, copper be 98.00%~99.99% and its more than.
Comparative example 1: the preparation of corncob modified magnetic heavy-metal adsorption material
1, the corncob of collection is rinsed well, filters off moisture and is dried in 60 DEG C~80 DEG C, smashes it through 60~80 meshes,
It is spare.
2, maize cob meal pretreated in step 1 and water (are guaranteed into maize cob meal quilt by the mass ratio of 1:2~1:3
Water all impregnates) it is fitted into the reaction vessel of belt stirrer or in appropriate containers, being adjusted to pH with 10% potassium hydroxide is
11.0, continue to stir (450 turns/min) or vibrate (260 turns/min) 3 hours, its pH is then adjusted to 4 with 5% nitric acid,
It stirs perhaps to be placed in oscillator under 450 turns/min speed and vibrates (260 turns/min) 1.2h then centrifugation or elimination water
Point, and it alternately is washed till neutrality with water and ethyl alcohol, and dry in an oven in 60~80 DEG C of temperature.
Step 1,3,4,5 are final to obtain corncob modified magnetic heavy-metal adsorption material with embodiment 1.
Experimental result: compared with adsorbent material prepared by embodiment 1, the corncob modified magnetic heavy metal of program preparation
Adsorbent material, only preferable to the removal effect of lead, removal rate can reach 99% or more, and to zinc, cadmium, chromium, copper removal effect phase
To poor, removal rate is between 75%~90%.
Comparative example 2: the preparation (step 3 low temperature) of corncob modified magnetic heavy-metal adsorption material
Steps 1 and 2,4,5 are the same as embodiment 1；
3, by the chemical modification corncob intermediate after the final drying in step 2 in the inert gases such as nitrogen or argon gas
Under protection, room temperature is down to temperature after 420 DEG C of holding 1.5h and is taken out, for use.
Experimental result: compared with adsorbent material prepared by embodiment 1, the corncob modified magnetic heavy metal of program preparation
Adsorbent material is the 1/2~3/4 of embodiment 1 to the saturated extent of adsorption of leaded, zinc, cadmium, chromium, copper under the same terms.
Comparative example 3: the preparation (not having inert gas shielding) of corncob modified magnetic heavy-metal adsorption material
Steps 1 and 2,3 are the same as embodiment 1；
4, water is added by the mass ratio of 1:2~1:3 in modified corn core powder intermediate obtained in step 3, is stirred in band
Mix closed and can be in heating in water bath for reaction system, bath temperature is maintained at 52 DEG C, and mixing speed keeps 600 turns/min uniformly to stir
It mixes, after being stirred to react 5min by 20% addition magnesium chloride of weight among modified corn core powder, molysite and ferrous iron is then added
Salt, molysite and ferrous salt total amount account for 33% of weight among modified corn core powder, and guarantee ferrous ion and iron ion mole
Ratio than 1:2 is stirred to react after 5min and adjusts pH immediately in 10~11 ranges, and after reacting 0.5h, its temperature is risen to 80
After DEG C the reaction was continued 1.5h it is cooling after be centrifuged or filtering, lotion to neutrality are dried, for use at 60~80 DEG C.
5, the product after drying in step 4 is obtained into corncob modified magnetic heavy metal adsorption after 430 DEG C of holding 2h
Material.
Experimental result: with embodiment 1 prepare adsorbent material compared with, the program preparation corncob modified absorbing material without
Magnetism, therefore adsorbent material is difficult to recycle after adsorption applications.
Comparative example 4: the preparation of corncob modified magnetic heavy-metal adsorption material (magnesium chloride is not added in step 4)
Steps 1 and 2,3,5 are the same as embodiment 1；
4, water is added by the mass ratio of 1:2~1:3 in modified corn core powder intermediate obtained in step 3, is stirred in band
Mix and stir the closed of inert gas shielding and can in heating in water bath for reaction system, under the inert gas shieldings such as nitrogen or argon gas,
Bath temperature is maintained at 52 DEG C, and mixing speed keeps 600 turns/min uniform stirring, and molysite and ferrous salt, molysite and ferrous iron is added
Salt total amount accounts for 33% of weight among modified corn core powder, and guarantees the ratio of ferrous ion and iron ion molar ratio 1:2, stirs
PH is adjusted immediately in 10~11 ranges after mixing reaction 5min, and after reacting 0.5h, its temperature is risen to 80 DEG C the reaction was continued 1.5h
It is centrifuged after cooling down afterwards or filtering, lotion to neutrality is dried, for use at 60~80 DEG C.
Experimental result: with embodiment 1 prepare adsorbent material compared with, the program preparation adsorbent material to lead, zinc, cadmium,
When chromium, copper heavy metal adsorption, under equal conditions, 2~4 times that dosage is embodiment 1 are most preferably added in adsorbent, and its saturation is inhaled
Attached amount is also 1/2~3/4 times of embodiment 1.
Comparative example 5: the preparation (step 5 high temperature) of corncob modified magnetic heavy-metal adsorption material
Steps 1 and 2,3,4 are the same as embodiment 1；
5, by the product after being dried in step 4 under the inert gas shieldings such as nitrogen or argon gas, after 550 DEG C of holding 2h
Obtain corncob modified magnetic heavy-metal adsorption material.
Experimental result: compared with adsorbent material prepared by embodiment 1, the magnetism of the adsorbent material of program preparation is weaker than reality
The adsorbent material in example 1 is applied, so that more difficult using magnet recycling adsorbent after absorption.
Claims (8)
1. a kind of preparation method of corncob modified magnetic heavy-metal adsorption material, which is characterized in that this method includes following step
It is rapid:
(1) corncob is cleaned, is dried, crushed, cross 60~80 meshes, it is spare；
(2) step (1) pretreated maize cob meal is mixed with water by the weight ratio of 1:2~1:4, with acid solution tune pH to 3.7
~4.5,1~1.5h of stirring or oscillation, being then adjusted to pH with lye is 10.5~11.5, continues to stir or vibrate 2.5-
3.5 hours, it is centrifuged or filters off moisture, and be alternately washed till neutrality with water and ethyl alcohol, and dry in 60~80 DEG C；
(3) under inert gas protection by the intermediate of step (2) drying, in 450~550 DEG C of 1 ~ 2h of holdings, after to temperature drop
It is taken out to room temperature, obtains modified corn core powder intermediate；
(4) the modified corn core powder intermediate for obtaining step (3) by 1:2~1:3 weight ratio be added water, in band stirring and it is lazy
Property gas shield closed and can be in heating in water bath for reaction system, under inert gas protection, bath temperature is maintained at 50~60
DEG C, uniform stirring is added magnesium chloride by 18%~24% of weight among modified corn core powder, after being stirred to react 5~8min, adds
Enter molysite and ferrous salt, is stirred to react after 4-6min and adjusts pH immediately 10~11, after reacting 0.4~0.5h, by bath temperature
Rise to 75~85 DEG C the reaction was continued it is cooling after 1.3~2.0h after be centrifuged or filtering, be washed till neutrality, dried at 60~80 DEG C,
For use；
(5) under inert gas protection by the product after step (4) drying, it in 430~480 DEG C of 1.5 ~ 2.5h of holding, that is, obtains
Corncob modified magnetic heavy-metal adsorption material；
The total amount of molysite and ferrous salt is 30%~40% of weight among modified corn core powder in step (4), and ferrous ion
With iron ion molar ratio 1:(2.0~2.3).
2. the preparation method of corncob modified magnetic heavy-metal adsorption material according to claim 1, which is characterized in that step
(1) pre-treatment step specifically: corncob is rinsed well with clear water, moisture is filtered off and is dried in 60 DEG C~80 DEG C, smashed it through
60~80 meshes.
3. the preparation method of corncob modified magnetic heavy-metal adsorption material according to claim 1, which is characterized in that step
(2) acid solution described in is the nitric acid solution of mass fraction 2%~5%, and the lye is the hydroxide of mass fraction 5%~10%
Potassium solution.
4. the preparation method of corncob modified magnetic heavy-metal adsorption material according to claim 1, which is characterized in that step
(2) it is 400~500 turns/min that speed when stirring is selected in, and selecting speed when oscillation is 200~260 turns/min.
5. the preparation method of corncob modified magnetic heavy-metal adsorption material according to claim 1, which is characterized in that step
(4) speed stirred in is 500~700 turns/min.
6. a kind of corncob modified magnetic heavy-metal adsorption material obtained using any preparation method of claim 1-5 is gone
The method of heavy metal in water removal, which is characterized in that this method comprises the following steps: the corncob modified magnetic heavy metal is inhaled
Enclosure material is added by the dosage of 2.0g/L~2.5g/L containing in heavy metal containing sewage, adjusts pH to 2~6,2~2.5h of stirring and adsorbing,
Then plus magnet recycles the adsorbent material.
7. go according to claim 6 water removal in heavy metal method, which is characterized in that the heavy metal include lead, zinc,
One of cadmium, chromium and copper are a variety of.
8. go according to claim 6 water removal in heavy metal method, which is characterized in that when go water removal in heavy metal be lead,
When zinc, cadmium, chromium, copper, adjusting pH value is respectively 5,2,6,4,4.
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