CN103433011A - Preparation method of wheat straw modified material for removing lead ions in waste water - Google Patents
Preparation method of wheat straw modified material for removing lead ions in waste water Download PDFInfo
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- CN103433011A CN103433011A CN2013103667328A CN201310366732A CN103433011A CN 103433011 A CN103433011 A CN 103433011A CN 2013103667328 A CN2013103667328 A CN 2013103667328A CN 201310366732 A CN201310366732 A CN 201310366732A CN 103433011 A CN103433011 A CN 103433011A
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Abstract
The invention belongs to the field of water treatment materials and relates to a preparation method of a wheat straw modified material for removing lead ions in waste water. The preparation method is about the modification of wheat straw, and specific technology comprises the following steps of cleaning, crushing, cellulase treatment, chitin modification and the like of the wheat straw. The wheat straw modified material prepared by adopting the method has the following advantages: (1) chemical modification is not involved, and the technological process is green and environment-friendly; (2) the prepared wheat straw modified material is pure natural and degradable; (3) the wheat straw modified material has strong adsorbability to the lead ions in a waste water solution, and each gram of the wheat straw modified material can absorb 820 mg of lead ions, which is 5-8 times of a conventional chemically-modified wheat straw material. The wheat straw modified material prepared by adopting the preparation method can be used for treating lead ion contained waste water in water treatment plants and also can be used for household water purifiers, thereby achieving a broad market prospect.
Description
Technical field
The invention belongs to the material for water treatment technical field, be specifically related to a kind of material modified preparation method of Wheat Straw who removes the Pb In Exhausted Water ion.
Background technology
Lead waste water between various battery cars, ore dressing plant, petrochemical plant etc.Battery industry is the main source of lead waste water, and 1 battery of every production at least causes plumbous loss 4.54mg, is secondly that petroleum industry is produced gasoline additive.Although lead is common not as copper, cadmium, but it is the common ingredients in waste water, especially Battery Plant produces a large amount of lead waste water in process of production, Pb In Exhausted Water content exceeds hundred times of national standards, underground water source is formed to very large threat, the discharge arbitrarily if do not processed, bring great harm must to environment and society.The current treatment process of lead waste water, apply more, than the technology of mature and reliable, have: ion-exchange, the precipitation method, absorption method etc.Wherein absorption method is the physicochemical properties of utilizing adsorbent special, as higher surface-active, larger specific area, special microcellular structure etc.Adsorbent commonly used has modified alta-mud, flyash, zeolite, potter's clay, active carbon etc.Absorption method technique has the advantages that deleading efficiency is high, cost is moderate, therefore has good prospect of the application, particularly more considerable to treatment effect after the modification of some adsorbents.
Processing by Wheat Straw for lead waste water, mainly contain following several method (Bioresource6 (2) (2011) 2161-2287, Bioresource Technology104 (2012) 807 – 809): (1) pulverizes Wheat Straw, with bentonite etc., mix, granulation shape water treatment composite, this method cost is low, but the lead ion adsorption capacity is low, adsorbing can not cycling and reutilization after saturated, causes the solid waste secondary pollution, (2) Wheat Straw is pulverized, with acid or alkali, stalk is processed, destroy silicon dioxide layer and the wax on stalk surface, improve the specific area of stalk, thereby improve the lead ion adsorption capacity of stalk, the shortcoming of this method is that acid or alkali pretreatment bring environmental pollution, and the waste water isolation of purified is difficult for, and the lead ion adsorption capacity does not reach the commercialization level, (3) Wheat Straw is pulverized, use tartaric acid, the organic acids such as citric acid carry out modification (Bioresource Technology99 (2008) 6709 – 6724) to stalk, at stalk surface graft carboxyl, chemisorbed by carboxyl to lead ion, increase substantially the adsorption capacity of stalk to lead ion, usually can reach 100～200 milligrams of (lead ion)/grams (Wheat Straw), thereby greatly reduced the processing cost of lead waste water, the shortcoming of this method is that the organic acid treatment effeciency is lower, acid is 0.5～1 with the weight ratio of stalk, excessive acid destroys the structure of stalk, generate a large amount of organic detritus, increased equally environmental pressure.
Novelty of the present invention is: (1) takes the lead in Wheat Straw is carried out to the cellulase processing, has improved the specific area of Wheat Straw, and the main component of the solution after enzyme is processed is polysaccharide, is the raw material of industry that economic worth is higher, is environmentally friendly technique; (2) modifying agent is chitin, is a kind of natural organic matter, and the material modified green of prepared Wheat Straw, natural, can be used for drinking water purification, thereby has expanded the material modified application of Wheat Straw; (3) the material modified adsorbance to lead ion of the Wheat Straw prepared reaches 820mg/g, i.e. the lead ion of the adsorbable 820mg of every gram Wheat Straw is material modified 5～8 times of conventional Wheat Straw; (4) by the material modified spirit of vinegar desorption of using of the Wheat Straw of adsorpting lead ion, then carry out " absorption-desorption is attached " technique, but iterative cycles use 10 times, further reduced the material modified use cost of Wheat Straw.
Summary of the invention
The invention belongs to the material for water treatment field, relate to a kind of material modified preparation method of Wheat Straw who removes the Pb In Exhausted Water ion.The preparation method that the present invention proposes is by the Wheat Straw modification, and concrete technology comprises that Wheat Straw is cleaned, pulverizing, cellulase is processed and chitin modification etc.Wheat Straw prepared by the present invention is material modified to have the following advantages: (1) does not relate to chemical modification, and technical process is green, environmental protection; (2) the material modified pure natural of the Wheat Straw prepared, degradable; (3), to the high adsorption capacity of lead ion in waste water solution, the lead ion of the material modified adsorbable 820mg of every gram Wheat Straw, be 5～8 times of conventional chemical modification Wheat Straw material.The material modified leaded ion waste water in water treatment plant that both can be used for of Wheat Straw prepared by the present invention is processed, and also can be used for household water filter, and market prospects are wide.
The material modified preparation method of Wheat Straw of the removal Pb In Exhausted Water ion that the present invention proposes is characterized in that:
1) clean Wheat Straw: by Wheat Straw rinsing, oven dry;
2) Wheat Straw is pulverized: the Wheat Straw after cleaning is placed in to pulverizer, and being ground into particle diameter is 20～100 purpose particles;
3) cellulase is processed: the Wheat Straw after pulverizing is placed in to cellulase solution 1～3 hour, takes out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed.The vigor of its cellulase is 1000U/g, and the solute of cellulase solution is deionized water, and mass concentration is 1%～5%, and every gram Wheat Straw applies cellulase and counts 1～50U/g by vigor;
4) chitin modification: the Wheat Straw that enzyme is processed is placed in chitin solution 10～30 minutes, takes out, and is placed in drying box, in 60～80 ℃ of dryings 3～6 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified.Wherein, the solvent of chitin solution is a kind of of deionized water, methyl alcohol, ethanol, isopropyl alcohol, oxolane, and mass concentration is 0.1%～5%.
By the material modified lead waste water that is placed in of Wheat Straw, regulator solution pH value was 5～6, in 20 ℃ of absorption 4 hours, the concentration of Pb In Exhausted Water ion is 100～2000mg/L, adsorbs completely, filters, by detecting residual lead ion amount in solution, draw the lead ion adsorbance that Wheat Straw is material modified.
Be placed in the acetum 0.5 hour that concentration is 0.1M by the Wheat Straw of adsorpting lead ion is material modified, filter, clean, dry, complete desorption technique, the Wheat Straw that obtains regeneration is material modified; Above-mentioned regrown material is placed in to lead waste water, carries out lead ion absorption.A plurality of circulation like this, until the material modified lead ion adsorbance of Wheat Straw is less than 80% of first adsorbance.
The accompanying drawing explanation
Fig. 1 is the material modified stereoscan photograph of Wheat Straw.
The specific embodiment
The invention is further illustrated by the following examples
Embodiment 1
Wheat Straw is gathered in, clean with running water, dry, the Wheat Straw after clean is placed in to pulverizer, being ground into particle diameter is 20～100 purpose particles, Wheat Straw after pulverizing is placed in to the cellulase aqueous solution 1 hour that concentration is 1%, and the vigor of cellulase is 1000U/g, and every gram Wheat Straw applies cellulase and counts 1U/g by vigor, take out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed.
The Wheat Straw that enzyme is processed is placed in 0.1% chitin water soluble liquid 10 minutes, takes out, and is placed in drying box, in 60 ℃ of dryings 3 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified.
By the material modified 20mL lead waste water that is placed in of 0.03g Wheat Straw, regulator solution pH value is 5～6, in 20 ℃ of absorption 4 hours, the concentration of plumbous Pb In Exhausted Water ion is 100～2000mg/L, adsorb completely, filter, by detecting residual lead ion amount in solution, show that the material modified lead ion adsorbance of Wheat Straw is 789mg/g, i.e. the material modified adsorbable 789mg lead ion of every gram Wheat Straw.
Be placed in the acetum 0.5 hour that concentration is 0.1M by the Wheat Straw of adsorpting lead ion is material modified, filter, clean, dry, complete desorption technique, the Wheat Straw that obtains regeneration is material modified; Above-mentioned regrown material is placed in to lead waste water, carries out lead ion absorption.10 circulations like this, the material modified lead ion adsorbance of Wheat Straw still reaches 670mg/g, is greater than 80% of first adsorbance.
Embodiment 2
Wheat Straw is gathered in, clean with running water, dry, the Wheat Straw after clean is placed in to pulverizer, being ground into particle diameter is 20～100 purpose particles, Wheat Straw after pulverizing is placed in to the cellulase aqueous solution 3 hours that concentration is 5%, and the vigor of cellulase is 1000U/g, and every gram Wheat Straw applies cellulase and counts 50U/g by vigor, take out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed.
The Wheat Straw that enzyme is processed is placed in 5% chitin methanol solution 30 minutes, takes out, and is placed in drying box, in 80 ℃ of dryings 6 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified.
By the material modified 20mL lead waste water that is placed in of 0.03g Wheat Straw, regulator solution pH value is 5～6, in 20 ℃ of absorption 4 hours, the concentration of plumbous Pb In Exhausted Water ion is 100～2000mg/L, adsorb completely, filter, by detecting residual lead ion amount in solution, show that the material modified lead ion adsorbance of Wheat Straw is 820mg/g, i.e. the material modified adsorbable 820mg lead ion of every gram Wheat Straw.
Be placed in the acetum 0.5 hour that concentration is 0.1M by the Wheat Straw of adsorpting lead ion is material modified, filter, clean, dry, complete desorption technique, the Wheat Straw that obtains regeneration is material modified; Above-mentioned regrown material is placed in to lead waste water, carries out lead ion absorption.10 circulations like this, the material modified lead ion adsorbance of Wheat Straw still reaches 720mg/g, is greater than 80% of first adsorbance.
Embodiment 3
Wheat Straw is gathered in, clean with running water, dry, the Wheat Straw after clean is placed in to pulverizer, being ground into particle diameter is 20～100 purpose particles, Wheat Straw after pulverizing is placed in to the cellulase aqueous solution 2 hours that concentration is 3%, and the vigor of cellulase is 1000U/g, and every gram Wheat Straw applies cellulase and counts 20U/g by vigor, take out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed.
The Wheat Straw that enzyme is processed is placed in 1% chitin ethanolic solution 20 minutes, takes out, and is placed in drying box, in 70 ℃ of dryings 2 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified.
By the material modified 20mL lead waste water that is placed in of 0.03g Wheat Straw, regulator solution pH value is 5～6, in 20 ℃ of absorption 4 hours, the concentration of plumbous Pb In Exhausted Water ion is 100～2000mg/L, adsorb completely, filter, by detecting residual lead ion amount in solution, show that the material modified lead ion adsorbance of Wheat Straw is 813mg/g, i.e. the material modified adsorbable 813mg lead ion of every gram Wheat Straw.
Be placed in the acetum 0.5 hour that concentration is 0.1M by the Wheat Straw of adsorpting lead ion is material modified, filter, clean, dry, complete desorption technique, the Wheat Straw that obtains regeneration is material modified; Above-mentioned regrown material is placed in to lead waste water, carries out lead ion absorption.10 circulations like this, the material modified lead ion adsorbance of Wheat Straw still reaches 683mg/g, is greater than 80% of first adsorbance.
Embodiment 4
Wheat Straw is gathered in, clean with running water, dry, the Wheat Straw after clean is placed in to pulverizer, being ground into particle diameter is 20～100 purpose particles, Wheat Straw after pulverizing is placed in to the cellulase aqueous solution 3 hours that concentration is 4%, and the vigor of cellulase is 1000U/g, and every gram Wheat Straw applies cellulase and counts 40U/g by vigor, take out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed.
The Wheat Straw that enzyme is processed is placed in 3% chitin aqueous isopropanol 25 minutes, takes out, and is placed in drying box, in 65 ℃ of dryings 1.5 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified.
By the material modified 20mL lead waste water that is placed in of 0.03g Wheat Straw, regulator solution pH value is 5～6, in 20 ℃ of absorption 4 hours, the concentration of plumbous Pb In Exhausted Water ion is 100～2000mg/L, adsorb completely, filter, by detecting residual lead ion amount in solution, show that the material modified lead ion adsorbance of Wheat Straw is 816mg/g, i.e. the material modified adsorbable 816mg lead ion of every gram Wheat Straw.
Be placed in the acetum 0.5 hour that concentration is 0.1M by the Wheat Straw of adsorpting lead ion is material modified, filter, clean, dry, complete desorption technique, the Wheat Straw that obtains regeneration is material modified; Above-mentioned regrown material is placed in to lead waste water, carries out lead ion absorption.10 circulations like this, the material modified lead ion adsorbance of Wheat Straw still reaches 698mg/g, is greater than 80% of first adsorbance.
Embodiment 5
Wheat Straw is gathered in, clean with running water, dry, the Wheat Straw after clean is placed in to pulverizer, being ground into particle diameter is 20～100 purpose particles, Wheat Straw after pulverizing is placed in to the cellulase aqueous solution 3 hours that concentration is 1%, and the vigor of cellulase is 1000U/g, and every gram Wheat Straw applies cellulase and counts 10U/g by vigor, take out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed.
The Wheat Straw that enzyme is processed is placed in 0.5% chitin tetrahydrofuran solution 30 minutes, takes out, and is placed in drying box, in 80 ℃ of dryings 3 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified.
By the material modified 20mL lead waste water that is placed in of 0.03g Wheat Straw, regulator solution pH value is 5～6, in 20 ℃ of absorption 4 hours, the concentration of plumbous Pb In Exhausted Water ion is 100～2000mg/L, adsorb completely, filter, by detecting residual lead ion amount in solution, show that the material modified lead ion adsorbance of Wheat Straw is 819mg/g, i.e. the material modified adsorbable 819mg lead ion of every gram Wheat Straw.
Be placed in the acetum 0.5 hour that concentration is 0.1M by the Wheat Straw of adsorpting lead ion is material modified, filter, clean, dry, complete desorption technique, the Wheat Straw that obtains regeneration is material modified; Above-mentioned regrown material is placed in to lead waste water, carries out lead ion absorption.10 circulations like this, the material modified lead ion adsorbance of Wheat Straw still reaches 716mg/g, is greater than 80% of first adsorbance.
Embodiment 6
Wheat Straw is gathered in, clean with running water, dry, the Wheat Straw after clean is placed in to pulverizer, being ground into particle diameter is 20～100 purpose particles, Wheat Straw after pulverizing is placed in to the cellulase aqueous solution 2 hours that concentration is 4%, and the vigor of cellulase is 1000U/g, and every gram Wheat Straw applies cellulase and counts 30U/g by vigor, take out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed.
The Wheat Straw that enzyme is processed is placed in 3% chitin ethanolic solution 20 minutes, takes out, and is placed in drying box, in 70 ℃ of dryings 3 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified.
By the material modified 20mL lead waste water that is placed in of 0.03g Wheat Straw, regulator solution pH value is 5～6, in 20 ℃ of absorption 4 hours, the concentration of plumbous Pb In Exhausted Water ion is 100～2000mg/L, adsorb completely, filter, by detecting residual lead ion amount in solution, show that the material modified lead ion adsorbance of Wheat Straw is 780mg/g, i.e. the material modified adsorbable 780mg lead ion of every gram Wheat Straw.
Be placed in the acetum 0.5 hour that concentration is 0.1M by the Wheat Straw of adsorpting lead ion is material modified, filter, clean, dry, complete desorption technique, the Wheat Straw that obtains regeneration is material modified; Above-mentioned regrown material is placed in to lead waste water, carries out lead ion absorption.10 circulations like this, the material modified lead ion adsorbance of Wheat Straw still reaches 703mg/g, is greater than 80% of first adsorbance.
Claims (1)
1. the material modified preparation method of Wheat Straw who removes the Pb In Exhausted Water ion is characterized in that:
1) clean Wheat Straw: by Wheat Straw rinsing, oven dry;
2) Wheat Straw is pulverized: the Wheat Straw after cleaning is placed in to pulverizer, and being ground into particle diameter is 20～100 purpose particles;
3) cellulase is processed: the Wheat Straw after pulverizing is placed in to cellulase solution 1～3 hour, takes out, use the deionized water cleaning, drying, obtain the Wheat Straw that enzyme is processed; The vigor of its cellulase is 1000U/g, and the solute of cellulase solution is deionized water, and mass concentration is 1%～5%, and every gram Wheat Straw applies cellulase and counts 1～50U/g by vigor;
4) chitin modification: the Wheat Straw that enzyme is processed is placed in chitin solution 10～30 minutes, takes out, and is placed in drying box, in 60～80 ℃ of dryings 3～6 hours, cooling, uses the deionized water cleaning, drying, obtains Wheat Straw material modified; Wherein, the solvent of chitin solution is a kind of of deionized water, methyl alcohol, ethanol, isopropyl alcohol, oxolane, and mass concentration is 0.1%～5%.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896357A (en) * | 2014-03-06 | 2014-07-02 | 西安工程大学 | Method for treating printing and dyeing wastewater by adopting abandoned straw |
| CN104001715A (en) * | 2014-06-03 | 2014-08-27 | 复旦大学 | Method for in-situ solidification-removal of heavy metals in soil |
| CN104069813A (en) * | 2014-07-11 | 2014-10-01 | 南开大学 | Method for preparing modified wheat straw hydrothermal charcoal by adopting KOH |
| CN105080502A (en) * | 2015-07-29 | 2015-11-25 | 上海沃杉化工有限公司 | Preparation method of wheat straw modified anion adsorbent |
| CN105127194A (en) * | 2015-09-30 | 2015-12-09 | 太仓碧奇新材料研发有限公司 | Method for preparing titanium dioxide composite material for remedying farmland soil contaminated by phentriazophos |
| CN105170104A (en) * | 2015-09-30 | 2015-12-23 | 太仓碧奇新材料研发有限公司 | Preparation method of hydrotalcite composite material for repairing soil of farmland with copper ions exceeding standard |
| CN105329972A (en) * | 2015-09-30 | 2016-02-17 | 太仓碧奇新材料研发有限公司 | Straw composite material preparation method |
| CN105521767A (en) * | 2015-12-21 | 2016-04-27 | 天津欧盼科技开发有限公司 | Adsorption agent for treatment of lead-containing wastewater and preparation method thereof |
| CN108160690A (en) * | 2017-11-27 | 2018-06-15 | 浙江师范大学 | A kind of restorative procedure of heavy-metal contaminated soil |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103896357A (en) * | 2014-03-06 | 2014-07-02 | 西安工程大学 | Method for treating printing and dyeing wastewater by adopting abandoned straw |
| CN104001715A (en) * | 2014-06-03 | 2014-08-27 | 复旦大学 | Method for in-situ solidification-removal of heavy metals in soil |
| CN104001715B (en) * | 2014-06-03 | 2016-09-28 | 复旦大学 | A kind of method of in-situ solidifying-remove heavy metal-polluted soil |
| CN104069813A (en) * | 2014-07-11 | 2014-10-01 | 南开大学 | Method for preparing modified wheat straw hydrothermal charcoal by adopting KOH |
| CN105080502A (en) * | 2015-07-29 | 2015-11-25 | 上海沃杉化工有限公司 | Preparation method of wheat straw modified anion adsorbent |
| CN105127194A (en) * | 2015-09-30 | 2015-12-09 | 太仓碧奇新材料研发有限公司 | Method for preparing titanium dioxide composite material for remedying farmland soil contaminated by phentriazophos |
| CN105170104A (en) * | 2015-09-30 | 2015-12-23 | 太仓碧奇新材料研发有限公司 | Preparation method of hydrotalcite composite material for repairing soil of farmland with copper ions exceeding standard |
| CN105329972A (en) * | 2015-09-30 | 2016-02-17 | 太仓碧奇新材料研发有限公司 | Straw composite material preparation method |
| CN105170104B (en) * | 2015-09-30 | 2017-12-05 | 太仓碧奇新材料研发有限公司 | A kind of preparation method for the hydrotalcite composite material for repairing the exceeded agricultural land soil of copper ion |
| CN105521767A (en) * | 2015-12-21 | 2016-04-27 | 天津欧盼科技开发有限公司 | Adsorption agent for treatment of lead-containing wastewater and preparation method thereof |
| CN108160690A (en) * | 2017-11-27 | 2018-06-15 | 浙江师范大学 | A kind of restorative procedure of heavy-metal contaminated soil |
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