CN103191703A - Preparation method and application of bagasse mercapto-biosorbent - Google Patents
Preparation method and application of bagasse mercapto-biosorbent Download PDFInfo
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Abstract
The invention discloses a preparation method and an application technology of a bagasse mercapto-biosorbent. The preparation method is characterized by comprising the following steps of: adding 35-45wt% of mercaptoacetic acid, 18-25wt% of tetrahydrofuran, 12-22wt% of alkalized bagasse and 0.15-1.0wt% of concentrated sulphuric acid in a triangular flask with a plug, performing a sealed room-temperature reaction for 2-4 hours, and adding 8-18wt% of sodium sulphide and 8-18wt% of water, wherein the sum of the percentages of all the components is 100%; plugging, and performing a static reaction for 48-60 hours at 40-45 DEG C; and then washing with deionized water, performing suction filtration until the filtrate is neutral, washing by a small amount of ethanol, placing in an oven at 55-65 DEG C and drying, so as to obtain the bagasse mercapto-biosorbent, wherein the bagasse mercapto-biosorbent is high in adsorption capacity for Cd2, Pb<2+> and Hg<2+>, fast in adsorption speed, good in physicochemical stability and mechanical stability, strong in regeneration capacity, high in repeated use times, low in cost, and capable of utilizing agricultural waste.
Description
Technical field
The present invention relates to the recycling of agricultural wastes, the preparation method of biological adsorption agent and the processing application technology of heavy metal wastewater thereby, the crossing domain that belongs to environment and material, particularly a kind of sulfydryl bagasse biological adsorption agent preparation method reaches application technology in water treatment.
Background technology
Fast development along with China's industry, heavy metal ion-containing waste water is a large amount of to be produced and discharging, heavy metal ion content increases in soil and the water source, heavy metal can enter organism by approach such as food chains, heavy metal ion can not be degraded in natural environment voluntarily, but also have the accumulation contact scar, and ecological environment and health are caused serious harm, the difficulty of improvement is bigger.At present, heavy metal pollution has become in the world today serious environmental and one of has polluted in the water body.Therefore, effectively take precautions against and administer heavy metal pollution and be very to press for and deal with problems, seek economical, effectively, safety, the approach that do not cause secondary pollution to administer heavy metal pollution is very important.At present, the method that heavy metal in the waste water is handled mainly contains three classes: the first kind is chemical precipitation method, comprises neutralization precipitation method, sulphide precipitation, the ferrite precipitation method, chemical reduction method, electrochemical process and macromolecule method; Second class is physical treatment process, comprises absorption method, ion-exchange, membrane separation process, evaporation and freezing method; The 3rd class is biological treatment, comprises bio-flocculation process, biochemical process and phytoremediation method.Wherein absorption method has the secondary pollution of not producing, and renewable recovery such as uses repeatedly at advantage, and enjoys attention.
At present, increasing agriculture and forestry organic waste material is used to be prepared into adsorbent, be used for handling heavy metal and dyestuff in the waste water, these discarded objects are the byproducts that produce in agricultural and the production of forestry process, enormous amount, have renewable, the regeneration period short, biodegradable, advantages of environment protection, is important living resources, mainly contains bark, shell, sawdust, stalk, bagasse etc.Wherein contain the cellulose height in the bagasse, and the intensity of fiber being big, is to prepare very ideal raw material of adsorbent, and China will produce 7,000,000 tons bagasse every year, have 70% be used as life and so expected, perhaps combustion (of oil) insitu field also, about 20% as feed, be used as paper making raw material about 10%, this discarded biological raw material of bagasse is taken full advantage of, can improve its using value, reduce and pollute, can increase simultaneously the value of crops, increase farmers' income.
Western last heros etc. from Japan in 1971 are received sulfydryl on the macromolecular chain of absorbent cotton first, generating a kind of new sulfydryl huge legendary turtle has closed since the solid absorbent, the separation and concentration adsorbent that with the sulfydryl is functional group has obtained using widely, and this is because the active group sulfydryl in the sulfydryl adsorbent has very strong huge legendary turtle cooperation usefulness with some heavy metal ion.Have both at home and abroad by chemical reaction sulfydryl is received on natural macromolecular or the resin, thereby make sulfhydryl dextran gel, sulphydryl activity charcoal and thiol resin etc., to realize to reach the quantitative absorption of some heavy metal ion the separation of some heavy metal ion.Synthetic and the application of domestic sulfydryl adsorbent, application number is to disclose a kind of method for preparing Sulfhydryl Cotton in 200310115874.3 the patent, it is characterized in that using thioglycolic acid, oxolane and the concentrated sulfuric acid are made into reactant liquor, the consumption of each component of reactant liquor by volume calculates, ratio is: thioglycolic acid: oxolane: the concentrated sulfuric acid=1:1:0.002, place reactant liquor 8 ~ 12 minutes in ground wide-mouth bottle reactor; Absorbent cotton is put into reactor, allow the complete soak degreasing cotton of reactant liquor, the consumption of reactant liquor and absorbent cotton be that the 100mL reactant liquor adds absorbent cotton 15 grams; The ground wide-mouth bottle is jumped a queue the back under 35 ~ 45 ℃ of temperature, places taking-up in 45 ~ 50 hours, and suction filtration adds absolute ethanol washing, in 40 ℃ of dryings; Application number is: the preparation method who discloses hydrosulfide group cellulose modifying material in the patent of 200410084394.X, it is characterized in that preparation technology is by the preparation of thioglycolic fibre cellulose solution, form the modification of active carbon, washing and the drying process of material with the thioglycolic fibre cellulose solution; Adopted a high proportion of acetic anhydride in the preparation process of described thioglycolic fibre cellulose solution, solution composition percentage is: cotton: 2.0 ~ 6.0%; TGA: 25 ~ 35%; Acetic anhydride: 52.5 ~ 70.9%; Glacial acetic acid: 2.0 ~ 6.0%; Sulfuric acid: 0.1 ~ 0.5%; Described thioglycolic fibre cellulose solution is that active carbon is soaked in the thioglycolic fibre cellulose solution to the modification of active carbon, under 30 ~ 40 ℃ of temperature, places 30 minutes.More than these two patents have only sulfydryl preparation of adsorbent method, not to the description of adsorption of metal ions.Application number is: disclose the purposes of mercapto-functional silicon dioxide hollow microsphere as mercury ion adsorbent in 200810039202.1 the patent, it is to Hg
2+Maximum adsorption capacity be 3477mg/g; Application number is: disclose mercapto-functionalized luffa preparation method and application in 200910019165.2 the patent, it is characterized in that: in the triangular flask of tool plug, add by following composition mass percent, TGA: 38 ~ 48%, oxolane: 30 ~ 40%, alkalization modified luffa: 18 ~ 25%, the concentrated sulfuric acid: 0.15 ~ 0.3%, jump a queue, place 48 h in 40 ℃ of constant temperature, spend deionised water, suction filtration then, till being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 35 ℃ of baking ovens, obtain mercapto-functionalized luffa.It is to Cd
2+Adsorption capacity can be up to 226mg/g, high adsorption rate can reach 99.5%, to Fe
3+Maximal absorptive capacity be 30.12mg/g, to Zn
2+Maximal absorptive capacity be 41.81mg/g, to Cu
2+Maximal absorptive capacity be 29.26mg/g.Application number is: disclose preparation method and the application of sulfydryl flax in 201110276212.9 the patent, characteristics are: in the triangular flask of tool plug, add by following composition mass percent, TGA: 45 ~ 52%, oxolane: 35 ~ 40%, the flax of coming unstuck: 23 ~ 30%, glacial acetic acid: 1 ~ 1.5%, the concentrated sulfuric acid: 0.15 ~ 0.3%, jump a queue, under 50 ~ 60 ℃, stir 4 ~ 6 h that reflux down, till spending deionised water, suction filtration then, being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 35 ℃ of baking ovens, obtain sulfydryl flax, it is to Cd
2+Adsorption capacity can be up to 282mg/g, high adsorption rate can reach 99.6%, to Pb
2+Maximal absorptive capacity be 519mg/g, to Cu
2+Maximal absorptive capacity be 160mg/g.
Bagasse contains and contains more free alcohol hydroxyl in a large amount of hydroxyls and the phenolic group, particularly cellulose.Bagasse can be introduced sulfydryl by chemical reaction, and (SH) group because the sequestering power of sulfydryl and heavy metal ion is very strong, is handled heavy metal in the waste water so make sulfydryl bagasse biological adsorption agent.Utilize bagasse to prepare adsorbent, namely meet circular economy concept, make the bagasse resource; Have to solve problem of environmental pollution, both reduced the burning problem of bagasse, make the heavy metal in the waste water obtain administering again, also improved the value of crops.
Summary of the invention
One of purpose of the present invention provides a kind of preparation method of sulfydryl bagasse biological adsorption agent, mainly makes the sulfydryl bagasse biological adsorption agent that obtains as the adsorption treatment of heavy metal ions in wastewater.
Purpose of the present invention is achieved through the following technical solutions.
A kind of preparation method of sulfydryl bagasse biological adsorption agent is characterised in that this method has following processing step:
(1) bagasse preliminary treatment: the bagasse after will squeezing washes with water removes earth and impurity, puts into the container 24 ~ 48h that is soaked in water, and boils 30 ~ 60min again, spend deionised water 3 ~ 6 times, pulverize after the vacuum drying, with 40 purpose sieve, obtain preliminary treatment bagasse;
(2) bagasse basification: be NaOH aqueous solution soaking 20 ~ 30h of 5 ~ 12% with preliminary treatment bagasse mass percentage concentration, boil 0.5 ~ 1h, spend deionised water after the cooling to neutral, behind the suction filtration, oven dry, the sugarcane slag crust must alkalize;
(3) preparation of sulfydryl bagasse biological adsorption agent: in reactor, add by following composition mass percent, TGA: 35 ~ 48%, oxolane: 18 ~ 25%, alkalization bagasse: 12 ~ 22%, the concentrated sulfuric acid: 0.15 ~ 1.0%, sealing room temperature reaction 2 ~ 4h, adding vulcanized sodium: 8 ~ ~ 18%, water: 8 ~ 18%, each component sum is absolutely, jumps a queue, under 40 ~ 45 ℃, arrest reaction 48 ~ 60 h spend deionised water then, suction filtration, till being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 55 ~ 65 ℃ of baking ovens, obtain sulfydryl bagasse biological adsorption agent.
Another object of the present invention provides a kind of sulfydryl bagasse biological adsorption agent as adsorbent application in the adsorption of metal ions in aqueous systems, and characteristics are: the sulfydryl bagasse biological adsorption agent for preparing is soaked 1 ~ 2 h with deionized water, by static method absorption.
The sulfydryl bagasse biological adsorption agent for preparing can also be soaked 1 ~ 2 h with deionized water, by dynamic method absorption.
Advantage of the present invention and effect are:
(1) the sulfydryl bagasse biological adsorption agent of the present invention's acquisition is to Cd
2, Pb
2+, Hg
2+High adsorption capacity has the sulfydryl characteristic, can be directly to absorption and the wash-out of heavy metal ion in the water body, the adsorption efficiency height, the speed of absorption is fast, desorption performance is good, can use in wideer soda acid scope;
(2) technology of the present invention is simple, and condition is easy to control, and production cost is low, is easy to suitability for industrialized production, has good physical and chemical stability and excellent mechanical strength;
(3) bagasse of the present invention's use is the discarded object of agricultural product, meets circular economy concept, makes the bagasse resource; May solve problem of environmental pollution, both reduce the burning problem of bagasse, make the heavy metal in the waste water obtain administering again, also improve the value of crops.
The specific embodiment
Embodiment 1
(1) bagasse preliminary treatment: the bagasse after will squeezing washes with water removes earth and impurity, puts into the container 40h that is soaked in water, and boils 30min again, spend deionised water 3 times, pulverize after the vacuum drying, with 40 purpose sieve, obtain preliminary treatment bagasse;
(2) bagasse basification: be 10% NaOH aqueous solution soaking 20h with preliminary treatment bagasse mass percentage concentration, boil 1h, spend deionised water after the cooling to neutral, behind the suction filtration, oven dry gets alkalization bagasse;
(3) preparation of sulfydryl bagasse biological adsorption agent: in the triangular flask of tool plug, add 22mL TGA and 13mL oxolane, add 4 concentrated sulfuric acids, mix, add 8g alkalization bagasse, sealing room temperature reaction 2h, add the 10mL50% sodium sulfide solution again, jump a queue, under 45 ℃, arrest reaction 50 h, till spending deionised water, suction filtration then, being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 65 ℃ of baking ovens, obtain sulfydryl bagasse biological adsorption agent.
Embodiment 2
(1) bagasse preliminary treatment: the bagasse after will squeezing washes with water removes earth and impurity, puts into the container 30h that is soaked in water, and boils 40min again, spend deionised water 3 times, pulverize after the vacuum drying, with 40 purpose sieve, obtain preliminary treatment bagasse;
(2) bagasse basification: be 5% NaOH aqueous solution soaking 24h with preliminary treatment bagasse mass percentage concentration, boil 0.5h, spend deionised water after the cooling to neutral, behind the suction filtration, oven dry gets alkalization bagasse;
(3) preparation of sulfydryl bagasse biological adsorption agent: in the triangular flask of tool plug, add 50mL TGA and 25mL oxolane, add 6 concentrated sulfuric acids, mix, add 25g alkalization bagasse, sealing room temperature reaction 3h, add the 30mL50% sodium sulfide solution again, jump a queue, under 40 ℃, arrest reaction 60 h, till spending deionised water, suction filtration then, being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 65 ℃ of baking ovens, obtain sulfydryl bagasse biological adsorption agent.
Embodiment 3
(1) bagasse preliminary treatment: the bagasse after will squeezing washes with water removes earth and impurity, puts into the container 48h that is soaked in water, and boils 50min again, spend deionised water 3 times, pulverize after the vacuum drying, with 40 purpose sieve, obtain preliminary treatment bagasse;
(2) bagasse basification: be 12% NaOH aqueous solution soaking 28h with preliminary treatment bagasse mass percentage concentration, boil 0.5h, spend deionised water after the cooling to neutral, behind the suction filtration, oven dry gets alkalization bagasse;
(3) preparation of sulfydryl bagasse biological adsorption agent: in the triangular flask of tool plug, add 20mL TGA and 10mL oxolane, add 2 concentrated sulfuric acids, mix, add 10g alkalization bagasse, sealing room temperature reaction 2h, add the 15mL50% sodium sulfide solution again, jump a queue, under 45 ℃, arrest reaction 55 h, till spending deionised water, suction filtration then, being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 55 ℃ of baking ovens, obtain sulfydryl bagasse biological adsorption agent.
Embodiment 4
(1) bagasse preliminary treatment: the bagasse after will squeezing washes with water removes earth and impurity, puts into the container 24h that is soaked in water, and boils 60min again, spend deionised water 6 times, pulverize after the vacuum drying, with 40 purpose sieve, obtain preliminary treatment bagasse;
(2) bagasse basification: be 8% NaOH aqueous solution soaking 30h with preliminary treatment bagasse mass percentage concentration, boil 1h, spend deionised water after the cooling to neutral, behind the suction filtration, oven dry gets alkalization bagasse;
(3) preparation of sulfydryl bagasse biological adsorption agent: in the triangular flask of tool plug, add 30mL TGA and 12mL oxolane, add 4 concentrated sulfuric acids, mix, add 10g alkalization bagasse, sealing room temperature reaction 2h, add the 10mL50% sodium sulfide solution again, jump a queue, under 40 ℃, arrest reaction 60 h, till spending deionised water, suction filtration then, being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 65 ℃ of baking ovens, obtain sulfydryl bagasse biological adsorption agent.
Embodiment 5
(1) bagasse preliminary treatment: the bagasse after will squeezing washes with water removes earth and impurity, puts into the container 30h that is soaked in water, and boils 40min again, spend deionised water 3 times, pulverize after the vacuum drying, with 40 purpose sieve, obtain preliminary treatment bagasse;
(2) bagasse basification: be 8% NaOH aqueous solution soaking 24h with preliminary treatment bagasse mass percentage concentration, boil 1h, spend deionised water after the cooling to neutral, behind the suction filtration, oven dry gets alkalization bagasse;
(3) preparation of sulfydryl bagasse biological adsorption agent: in the triangular flask of tool plug, add 20mL TGA and 11mL oxolane, add 4 concentrated sulfuric acids, mix, add 7g alkalization bagasse, sealing room temperature reaction 2h, add the 18mL50% sodium sulfide solution again, jump a queue, under 45 ℃, arrest reaction 50 h, till spending deionised water, suction filtration then, being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 65 ℃ of baking ovens, obtain sulfydryl bagasse biological adsorption agent.
The content of applied chemistry assay sulfydryl, the sulfydryl bagasse biological adsorption agent of above embodiment preparation, its sulfhydryl content basically identical.
Embodiment 6
Take by weighing 0.10g sulfydryl bagasse biological adsorption agent and place three 250mL tool plug conical flasks respectively, add the Cd that 100mL concentration is 300mg/L respectively
2+, 500 mg/L Pb
2+, the Hg of 500mg/L
2+In the solution, pH value with acid or alkali regulation system is in 3.0 ~ 9.0 scopes, 1 ~ 2 h of concussion absorption at room temperature, get supernatant, concentration with the aas determination metal ion, belong to the concentration difference of ion according to underwater gold before and after the absorption, calculate the adsorption capacity of sulfydryl bagasse biological adsorption agent, it is the mean value of measuring for 6 times that embodiment 1 ~ 5 prepared sulfydryl bagasse biological adsorption agent is listed table 1. result in to the adsorption capacity result of metal ion
The acid of table 1 lemon is modified palm bark adsorbent to the adsorption capacity measurement result of dyestuff
From table 1 visible pH value in 3.0 ~ 9.0 scopes adsorbent to Cd
2+, Pb
2+, Hg
2+Not influence of absorption,, more than 1 h of concussion absorption at room temperature, metal ion adsorbs fully substantially, Cd
2+, Pb
2+, Hg
2+High-adsorption-capacity can reach 225 mg/g, 421 mg/g, 409 mg/g respectively.
This shows that sulfydryl bagasse biological adsorption agent is to Cd
2+, Pb
2+, Hg
2+Ion has the good adsorption performance, and the pH value of application is divided into very wide, is a kind of desirable biological adsorption agent.
Claims (4)
1. sulfydryl bagasse biological adsorption agent preparation method is characterized in that: be that this method has following processing step:
(1) bagasse preliminary treatment: the bagasse after will squeezing washes with water removes earth and impurity, puts into the container 24 ~ 48h that is soaked in water, and boils 30 ~ 60min again, spend deionised water 3 ~ 6 times, pulverize after the vacuum drying, with 40 purpose sieve, obtain preliminary treatment bagasse;
(2) bagasse basification: be NaOH aqueous solution soaking 20 ~ 30h of 5 ~ 12% with preliminary treatment bagasse mass percentage concentration, boil 0.5 ~ 1h, spend deionised water after the cooling to neutral, behind the suction filtration, oven dry, the sugarcane slag crust must alkalize;
(3) preparation of sulfydryl bagasse biological adsorption agent: in reactor, add by following composition mass percent, TGA: 35 ~ 48%, oxolane: 18 ~ 25%, alkalization bagasse: 12 ~ 22%, the concentrated sulfuric acid: 0.15 ~ 1.0%, sealing room temperature reaction 2 ~ 4h, adding vulcanized sodium: 8 ~ ~ 18%, water: 8 ~ 18%, each component sum is absolutely, jumps a queue, under 40 ~ 45 ℃, arrest reaction 48 ~ 60 h spend deionised water then, suction filtration, till being neutrality to filtrate, after the small amount of ethanol washing, be placed on drying in 55 ~ 65 ℃ of baking ovens, obtain sulfydryl bagasse biological adsorption agent.
2. the preparation method of sulfydryl bagasse biological adsorption agent according to claim 1 is characterized in that described vulcanized sodium is the vulcanized sodium that contains nine crystallizations water.
3. sulfydryl palm bark adsorbent preparation method according to claim 1 is characterized in that the described thioglycolic acid date of manufacture will will filter before using in 6 months.
4. the preparation method of sulfydryl bagasse biological adsorption agent according to claim 1, it is characterized in that described sulfydryl bagasse biological adsorption agent as water treatment agent to Cd in the waste water
2, Pb
2+, Hg
2+Application in the absorption.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464118A (en) * | 2013-09-26 | 2013-12-25 | 济南大学 | Preparation method and applications of epichlorohydrin-modified palm tree bark adsorbent |
| CN103723852A (en) * | 2013-12-04 | 2014-04-16 | 刘军亮 | Sewage treatment method based on inorganic and organic heavy metal absorbents |
| CN104209098A (en) * | 2014-08-27 | 2014-12-17 | 镇江华域环保设备制造有限公司 | Heavy metal adsorbent used in sewage treatment and application of heavy metal adsorbent |
| CN104587987A (en) * | 2014-12-23 | 2015-05-06 | 中华人民共和国防城港出入境检验检疫局 | Preparation method and application of sulfhydryl bagasse solid-phase extraction agent |
| CN105664869A (en) * | 2016-02-17 | 2016-06-15 | 济南大学 | Preparation of lauramidopropyl betaine modified palm tree bark adsorbent |
| CN106167304A (en) * | 2016-08-08 | 2016-11-30 | 孟祥娣 | A kind of heavy metal-polluted water treatment agent and processing method |
| CN106390936A (en) * | 2016-12-07 | 2017-02-15 | 郑州源冉生物技术有限公司 | Illite adsorbent as well as preparation method and application thereof |
| CN107986531A (en) * | 2017-12-15 | 2018-05-04 | 苏州纳贝通环境科技有限公司 | A kind of processing method of heavy metal-containing waste water |
| CN111717954A (en) * | 2020-07-06 | 2020-09-29 | 广西夏阳环保科技有限公司 | Heavy metal wastewater treating agent and treating method thereof |
| CN115106062A (en) * | 2022-06-27 | 2022-09-27 | 湖北中烟工业有限责任公司 | Composite natural solid phase extracting agent, preparation method thereof and resveratrol purification method |
| CN115646435A (en) * | 2022-11-18 | 2023-01-31 | 中国水产科学研究院黄海水产研究所 | Marine heavy metal adsorbent, preparation and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103464118A (en) * | 2013-09-26 | 2013-12-25 | 济南大学 | Preparation method and applications of epichlorohydrin-modified palm tree bark adsorbent |
| CN103723852A (en) * | 2013-12-04 | 2014-04-16 | 刘军亮 | Sewage treatment method based on inorganic and organic heavy metal absorbents |
| CN103723852B (en) * | 2013-12-04 | 2015-04-08 | 刘军亮 | Sewage treatment method based on inorganic and organic heavy metal absorbents |
| CN104209098A (en) * | 2014-08-27 | 2014-12-17 | 镇江华域环保设备制造有限公司 | Heavy metal adsorbent used in sewage treatment and application of heavy metal adsorbent |
| CN104209098B (en) * | 2014-08-27 | 2016-05-25 | 镇江华域环保设备制造有限公司 | Heavy metal absorbent in a kind of sewage disposal and application thereof |
| CN104587987A (en) * | 2014-12-23 | 2015-05-06 | 中华人民共和国防城港出入境检验检疫局 | Preparation method and application of sulfhydryl bagasse solid-phase extraction agent |
| CN105664869A (en) * | 2016-02-17 | 2016-06-15 | 济南大学 | Preparation of lauramidopropyl betaine modified palm tree bark adsorbent |
| CN106167304A (en) * | 2016-08-08 | 2016-11-30 | 孟祥娣 | A kind of heavy metal-polluted water treatment agent and processing method |
| CN106390936A (en) * | 2016-12-07 | 2017-02-15 | 郑州源冉生物技术有限公司 | Illite adsorbent as well as preparation method and application thereof |
| CN107986531A (en) * | 2017-12-15 | 2018-05-04 | 苏州纳贝通环境科技有限公司 | A kind of processing method of heavy metal-containing waste water |
| CN111717954A (en) * | 2020-07-06 | 2020-09-29 | 广西夏阳环保科技有限公司 | Heavy metal wastewater treating agent and treating method thereof |
| CN115106062A (en) * | 2022-06-27 | 2022-09-27 | 湖北中烟工业有限责任公司 | Composite natural solid phase extracting agent, preparation method thereof and resveratrol purification method |
| CN115106062B (en) * | 2022-06-27 | 2023-10-31 | 湖北中烟工业有限责任公司 | Composite natural solid phase extractant, preparation method thereof and resveratrol purification method |
| CN115646435A (en) * | 2022-11-18 | 2023-01-31 | 中国水产科学研究院黄海水产研究所 | Marine heavy metal adsorbent, preparation and use method thereof |
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Application publication date: 20130710 |