CN104289200A - Preparation method and application of magnetic HACC/oxidized multi-walled carbon nanotube adsorbent - Google Patents

Preparation method and application of magnetic HACC/oxidized multi-walled carbon nanotube adsorbent Download PDF

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CN104289200A
CN104289200A CN201410575555.9A CN201410575555A CN104289200A CN 104289200 A CN104289200 A CN 104289200A CN 201410575555 A CN201410575555 A CN 201410575555A CN 104289200 A CN104289200 A CN 104289200A
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hacc
walled carbon
adsorbent
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carbon nano
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CN104289200B (en
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魏琴
王耀光
杜斌
闫涛
魏东
胡丽华
闫良国
王晓东
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University of Jinan
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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
    • 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
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • 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
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B01J20/205—Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs
    • 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
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • 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
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
    • 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

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Abstract

The invention discloses a preparation method and application of a magnetic HACC (Hydroxypropyl Trimethyl Ammonium Chloride Chitosan)/oxidized multi-walled carbon nanotube adsorbent. The preparation method is characterized by comprising the steps: adding 0.2-0.6 g HACC into a solution formed by 20 mL water and 5 mL glacial acetic acid, performing ultrasonic treatment at room temperature for 2-4 h, adding 0.05-0.20 g magnetic amination ferroferric oxide and stirring for 1-2 h, adding 3 mL liquid paraffin while stirring slowly, carrying on stirring for 0.5-1 h, adding 3 mL 25% glutaraldehyde to crosslink HACC, meanwhile, adding 0.1-0.2 g oxidized multi-walled carbon nanotube for reaction at 50 DEG C for 1.5-2 h, adjusting pH within 9-10 by using 2 mol/L NaOH, keeping at 80 DEG C for 1 h, washing an obtained product until pH is 7.0 sequentially by using petroleum ether, ethanol and de-ionized water to prepare the magnetic HACC/oxidized multi-walled carbon nanotube adsorbent. The adsorbent is simple and practicable in preparation method, high in adsorption capacity of adsorbing heavy metal and high in adsorption as well as separation speed, can be utilized repeatedly, and obtains excellent effects on treating heavy metal in waste water, and no secondary pollution exists in the adsorption process.

Description

A kind of magnetic HACC/ is oxidized preparation method and the application of multi-walled carbon nano-tubes adsorbent
Technical field
The invention belongs to water-treatment technology field, particularly a kind of magnetic HACC HACC/ be oxidized multi-walled carbon nano-tubes adsorbent preparation method and in water treatment the application technology of heavy metal ionic adsorption.
Background technology
Along with the development of the industry such as mining industry and chemical industry, a large amount of waste water containing heavy metal is discharged in soil, water and air, threatens the health of people.Heavy metal ion is not biodegradable persistent pollutant as lead, mercury, chromium, cadmium, can be entered in human body by food chain, once will be produced serious harm by human intake.
The method of heavy-metal ion removal has chemical precipitation method, ion-exchange, membrane separation process, flocculence and electrolysis.But these method costs are high, complicated and be difficult to meet environmental protection requirement, therefore, environmentalist is devoted to find simple, efficient, economy, the technology of environmental protection removes heavy metal ion in waste water.Absorption method is considered to a kind of method of efficient water treatment, so, find suitable adsorbent and seem particularly important.In recent years, various adsorbent such as zeolite, kaolin, active carbon, ion exchange resin and some biological adsorption agents are used to remove the heavy metal ion in water, these traditional adsorbents exist that a lot of shortcoming is as low in adsorption efficiency, adsorbance is little, find efficient adsorbent just necessary.
Many researchers have studied the absorption property of the CNT heavy metal ion with large specific area and high mechanical performance, and research proves that the CNT after modifying all increases significantly in adsorption efficiency and adsorption capacity.Meanwhile, due to hydroxyl and amino existence, shitosan is also widely used in Adsorption of Heavy Metal Ions, and the derivative of shitosan is seldom studied.HACC is the shitosan shitosan higher derivative obtained through chemical modification, is called for short HACC.HACC has good water-soluble, the performance such as film forming, hair conditioning, water conservation water imbibition, antistatic behaviour and antibiotic property, all can dissolve under acidity, alkali condition, and good stability, there is very high charge density, be strong positive sub-polymer, have higher charge neutrality and adsorption bridging ability than shitosan.It can not only remove trickle suspended particulate in water, and various oil contents, colourity, COD, the metal ion that can effectively remove in water, also there is sterilization ability, and have that cohesion is fast, dehydration property is good and have no side effect, the advantage such as fully biodegradable, be oxidized multi-walled carbon nano-tubes compound after its adsorption capacity promoted further.Yan-Hui Li etc. have studied the adsorbance of CNT to lead ion and reaches 30.32mg/g; Be only 1.1mg/g to the adsorbance of cadmium ion, after processing respectively with hydrogen peroxide, nitric acid and potassium permanganate, its adsorbance becomes 2.6,5.1 and 11.0mg/g; Ze-Chao Di etc. have studied the absorption behavior of carbon nanotube loaded ceria to chromium ion, and its maximal absorptive capacity is 30.2 mg/g; The sand that Meng-Wei Wan etc. have studied shitosan bag quilt is 12.32 mg/g to the adsorbance of lead ion; W.S. Wan Ngah etc. have studied shitosan-tripolyphosphate microballoon to the adsorbance of lead ion is 57.33 mg/g.Above ABSORBENTS ABSORPTION metal biosorption effect is general.Based on this, we have prepared a kind of novel magnetic HACC/oxidation multi-walled carbon nano-tubes adsorbent, this adsorbent has good magnetic, adsorbent is made to be easy to realize with being separated of solution, simultaneously, the method preparing this adsorbent is simple, and adsorbent efficiency is high, 103.4 can be reached respectively to the adsorbance of chromium ion, lead ion and cadmium ion, 111.2,93.6mg/g, can reuse, to environment non-secondary pollution.
Summary of the invention
An object of the present invention is the preparation method and the application that provide a kind of magnetic HACC HACC/ oxidation multi-walled carbon nano-tubes adsorbent, and a kind of magnetic HACC/ of acquisition is oxidized multi-walled carbon nano-tubes adsorbent and carries out adsorbing separation to the heavy metal ion in water.
technical scheme of the present invention is as follows:
1. the preparation method of a magnetic HACC/ oxidation multi-walled carbon nano-tubes adsorbent
0.2 ~ 0.6g HACC HACC is added in 20mL water and 5mL glacial acetic acid solution, at room temperature ultrasonic 2 ~ 4h, add 0.05 ~ 0.20g magnetic amination tri-iron tetroxide, stir 1 ~ 2h, add 3mL atoleine under slow stirring, continue stirring 0.5 ~ 1h, add 3mL, 25% glutaraldehyde is with cross-linked hydroxypropyl base trimethyl ammonium chloride shitosan HACC, simultaneously, add 0.1 ~ 0.2g and be oxidized multi-walled carbon nano-tubes, 1.5 ~ 2h is reacted under 50oC, pH is adjusted 9 ~ 10 with 2mol/L NaOH, 1h is kept under 80oC, the product obtained uses benzinum successively, ethanol, deionized water washing is 7.0 to pH, obtained a kind of magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent.
2. oxidation multi-wall carbon nano-tube tube preparation method described above
0.3 ~ 0.7g multi-walled carbon nano-tubes is put into the concentrated sulfuric acid and red fuming nitric acid (RFNA) volume ratio is the nitration mixture of 2.5 ~ 3.5: 1, ultrasonic 2 ~ 4 h under 40oC, be cooled to 27oC, mixed liquor deionized water is diluted to 500mL, filter, spend deionized water be 7.0,60oC to pH under vacuum drying, grinding obtained oxidation multi-wall carbon nano-tube pipe powder.
3. adsorbent is to the removal step of heavy metal ion in water
Get 25mL, 30 ~ 60mg/L heavy metal ion solution in 100mL conical flask, pH is regulated to be 3 ~ 6, add 8 ~ 15mg magnetic HACC/ and be oxidized multi-walled carbon nano-tubes adsorbent, 25oC is placed down in water bath with thermostatic control oscillator the 1.0 ~ 3.0h that vibrates, take out conical flask, with strong magnets separating adsorbent and solution, get the concentration that clear liquid detects heavy metal ion, according to the initial concentration of heavy metal ion in solution c 0with the concentration of heavy metal ion in solution after absorption c ecalculate the clearance of heavy metal ion.
Heavy metal ion described above is selected from one of following: Cr 6+, Pb 2+, Cd 2+.
useful achievement of the present invention
(1) magnetic HACC/oxidation multi-walled carbon nano-tubes adsorbent that the present invention obtains is a kind of novel nano-complex sorbent material, there is good physical and chemical performance and excellent mechanical strength, adsorption capacity is large, 103.4 can be reached respectively to the adsorbance of chromium ion, lead ion and cadmium ion, 111.2,93.6mg/g, can Reusability.
(2) preparation process of magnetic HACC of the present invention/oxidation multi-walled carbon nano-tubes adsorbent is simple, and condition is easy to control, and easy to operate, production cost is low.
(3) the magnetic HACC/oxidation multi-walled carbon nano-tubes adsorbent of the present invention's acquisition is high to the heavy metal ion adsorbed efficiency in water, and soon, desorption performance is good, can use within the scope of wider soda acid for absorption and separating rate.
Detailed description of the invention
embodiment 1a kind of magnetic HACC/ is oxidized the preparation of multi-walled carbon nano-tubes adsorbent
0.2g HACC HACC is added in 20mL water and 5mL glacial acetic acid solution, at room temperature ultrasonic 2h, add 0.10g magnetic amination tri-iron tetroxide, stir 1h, add 3mL atoleine under slow stirring, continue to stir 0.5h, add 3mL, 25% glutaraldehyde is with cross-linked hydroxypropyl base trimethyl ammonium chloride shitosan HACC, simultaneously, add 0.1g and be oxidized multi-walled carbon nano-tubes, 1.5h is reacted under 50oC, pH is adjusted 9 ~ 10 with 2mol/L NaOH, 1h is kept under 80oC, the product obtained uses benzinum successively, ethanol, deionized water washing is 7.0 to pH, obtained a kind of magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent.
embodiment 2a kind of magnetic HACC/ is oxidized the preparation of multi-walled carbon nano-tubes adsorbent
0.4g HACC HACC is added in 20mL water and 5mL glacial acetic acid solution, at room temperature ultrasonic 3h, add 0.15g magnetic amination tri-iron tetroxide, stir 1.5h, add 3mL atoleine under slow stirring, continue to stir 0.8h, add 3mL, 25% glutaraldehyde is with cross-linked hydroxypropyl base trimethyl ammonium chloride shitosan HACC, simultaneously, add 0.15g and be oxidized multi-walled carbon nano-tubes, 1.7h is reacted under 50oC, pH is adjusted 9 ~ 10 with 2mol/L NaOH, 1h is kept under 80oC, the product obtained uses benzinum successively, ethanol, deionized water washing is 7.0 to pH, obtained a kind of magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent.
embodiment 3a kind of magnetic HACC/ is oxidized the preparation of multi-walled carbon nano-tubes adsorbent
0.6g HACC HACC is added in 20mL water and 5mL glacial acetic acid solution, at room temperature ultrasonic 4h, add 0.20g magnetic amination tri-iron tetroxide, stir 2h, add 3mL atoleine under slow stirring, continue to stir 1h, add 3mL, 25% glutaraldehyde is with cross-linked hydroxypropyl base trimethyl ammonium chloride shitosan HACC, simultaneously, add 0.2g and be oxidized multi-walled carbon nano-tubes, 2h is reacted under 50oC, pH is adjusted 9 ~ 10 with 2mol/L NaOH, 1h is kept under 80oC, the product obtained uses benzinum successively, ethanol, deionized water washing is 7.0 to pH, obtained a kind of magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent.
embodiment 4the preparation method of oxidation multi-walled carbon nano-tubes
Described oxidation multi-walled carbon nano-tubes, it is characterized in that, 0.4g multi-walled carbon nano-tubes is put into the concentrated sulfuric acid and red fuming nitric acid (RFNA) volume ratio is the nitration mixture of 2.5:1, under 40oC, ultrasonic 2 h, are cooled to 27oC, and mixed liquor deionized water is diluted to 500mL, filter, spend deionized water be 7.0,60oC to pH under vacuum drying, grinding obtained oxidation multi-wall carbon nano-tube pipe powder.
embodiment 5the preparation method of oxidation multi-walled carbon nano-tubes
Described oxidation multi-walled carbon nano-tubes, it is characterized in that, 0.6g multi-walled carbon nano-tubes is put into the concentrated sulfuric acid and red fuming nitric acid (RFNA) volume ratio is the nitration mixture of 3:1, under 40oC, ultrasonic 4 h, are cooled to 27oC, and mixed liquor deionized water is diluted to 500mL, filter, spend deionized water be 7.0,60oC to pH under vacuum drying, grinding obtained oxidation multi-wall carbon nano-tube pipe powder.
embodiment 6magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent to Cr(VI) absorption
Get the Cr of 25mL, 35mg/L 6+solion, in 100mL conical flask, regulates pH to be 3, and add 8mg magnetic HACC/ and be oxidized multi-walled carbon nano-tubes adsorbent, 25oC is placed down in water bath with thermostatic control oscillator the 2h that vibrates, and takes out conical flask, with strong magnets separating adsorbent and solution, gets clear liquid and detects Cr 6+the concentration of ion, according to Cr in solution 6+the initial concentration of ion c 0with Cr in solution after absorption 6+the concentration of ion c ecalculate Cr 6+the clearance of ion is 94.5%, and adsorbance is 103.4mg/g.
embodiment 7magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent to Pb 2+the absorption of ion
Get the Pb of 25mL, 55mg/L 2+solion, in 100mL conical flask, regulates pH to be 5, and add 12mg magnetic HACC/ and be oxidized multi-walled carbon nano-tubes adsorbent, 25oC is placed down in water bath with thermostatic control oscillator the 2h that vibrates, and takes out conical flask, with strong magnets separating adsorbent and solution, gets clear liquid and detects Pb 2+the concentration of ion, according to Pb in solution 2+the initial concentration of ion c 0with Pb in solution after absorption 2+the concentration of ion c ecalculate Pb 2+the clearance 97.0% of ion, adsorbance is 111.2 mg/g.
embodiment 8magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent to Cd 2+the absorption of ion
Get the Cd of 25mL, 60mg/L 2+solion, in 100mL conical flask, regulates pH to be 6, and add 15mg magnetic HACC/ and be oxidized multi-walled carbon nano-tubes adsorbent, 25oC is placed down in water bath with thermostatic control oscillator the 3.0h that vibrates, and takes out conical flask, with strong magnets separating adsorbent and solution, gets clear liquid and detects Cd 2+the concentration of ion, according to Cd in solution 2+the initial concentration of ion c 0with Cd in solution after absorption 2+the concentration of ion c ecalculate Cd 2+the clearance of ion is 93.6%, and adsorbance is 93.6mg/g.

Claims (4)

1. magnetic HACC/ is oxidized a preparation method for multi-walled carbon nano-tubes adsorbent, it is characterized in that, comprises the following steps:
0.2 ~ 0.6g HACC HACC is added in 20mL water and 5mL glacial acetic acid solution, at room temperature ultrasonic 2 ~ 4h, add 0.05 ~ 0.20g magnetic amination tri-iron tetroxide, stir 1 ~ 2h, add 3mL atoleine under slow stirring, continue stirring 0.5 ~ 1h, add 3mL, 25% glutaraldehyde is with cross-linked hydroxypropyl base trimethyl ammonium chloride shitosan HACC, simultaneously, add 0.1 ~ 0.2g and be oxidized multi-walled carbon nano-tubes, 1.5 ~ 2h is reacted under 50oC, pH is adjusted 9 ~ 10 with 2mol/L NaOH, 1h is kept under 80oC, the product obtained uses benzinum successively, ethanol, deionized water washing is 7.0 to pH, obtained a kind of magnetic HACC/ is oxidized multi-walled carbon nano-tubes adsorbent.
2. a kind of magnetic HACC/ as claimed in claim 1 is oxidized the preparation method of multi-walled carbon nano-tubes adsorbent, described oxidation multi-walled carbon nano-tubes, it is characterized in that, 0.3 ~ 0.7g multi-walled carbon nano-tubes is put into the concentrated sulfuric acid and red fuming nitric acid (RFNA) volume ratio is the nitration mixture of 2.5 ~ 3.5: 1, ultrasonic 2 ~ 4 h under 40oC, be cooled to 27oC, mixed liquor deionized water is diluted to 500mL, filters, spending deionized water to pH is 7.0, vacuum drying under 60oC, grinding obtained oxidation multi-wall carbon nano-tube pipe powder.
3. a kind of magnetic HACC/ as claimed in claim 1 is oxidized the preparation method of multi-walled carbon nano-tubes adsorbent, and it is characterized in that, for the removal of heavy metal ion in water, step is as follows:
Get 25mL, 30 ~ 60mg/L heavy metal ion solution in 100mL conical flask, pH is regulated to be 3 ~ 6, add 8 ~ 15mg magnetic HACC/ and be oxidized multi-walled carbon nano-tubes adsorbent, 25oC is placed down in water bath with thermostatic control oscillator the 1.0 ~ 3.0h that vibrates, take out conical flask, with strong magnets separating adsorbent and solution, get the concentration that clear liquid detects heavy metal ion, according to the initial concentration of heavy metal ion in solution c 0with the concentration of heavy metal ion in solution after absorption c ecalculate the clearance of heavy metal ion.
4. a kind of magnetic HACC/ as claimed in claim 1 is oxidized the preparation method of multi-walled carbon nano-tubes adsorbent, it is characterized in that, heavy metal ion is selected from one of following: Cr 6+, Pb 2+, Cd 2+.
CN201410575555.9A 2014-10-25 2014-10-25 A kind of preparation method and application of magnetic HACC/ oxidation multi-walled carbon nano-tubes adsorbent Expired - Fee Related CN104289200B (en)

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TWI628144B (en) * 2016-04-29 2018-07-01 識驊科技股份有限公司 Nano carbon tube composite structure with high moisture retention and high bactericidal activity of cerium oxide nanoparticles and silver nanoparticles
CN110449132A (en) * 2019-09-05 2019-11-15 江西理工大学 A kind of preparation method and applications of modified carbon nano-tube adsorbent
CN112169780A (en) * 2020-10-21 2021-01-05 陕西科技大学 Gelatin-based hydrogel adsorbent for adsorbing hexavalent chromium ions and preparation method thereof
CN114177892A (en) * 2021-12-09 2022-03-15 黑龙江八一农垦大学 Carbon nano tube composite adsorbent and preparation method thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI628144B (en) * 2016-04-29 2018-07-01 識驊科技股份有限公司 Nano carbon tube composite structure with high moisture retention and high bactericidal activity of cerium oxide nanoparticles and silver nanoparticles
CN110449132A (en) * 2019-09-05 2019-11-15 江西理工大学 A kind of preparation method and applications of modified carbon nano-tube adsorbent
CN110449132B (en) * 2019-09-05 2022-03-25 江西理工大学 Preparation method and application of modified carbon nanotube adsorbent
CN112169780A (en) * 2020-10-21 2021-01-05 陕西科技大学 Gelatin-based hydrogel adsorbent for adsorbing hexavalent chromium ions and preparation method thereof
CN112169780B (en) * 2020-10-21 2022-11-25 陕西科技大学 Gelatin-based hydrogel adsorbent for adsorbing hexavalent chromium ions and preparation method thereof
CN114177892A (en) * 2021-12-09 2022-03-15 黑龙江八一农垦大学 Carbon nano tube composite adsorbent and preparation method thereof

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