CN112354515A - Method for preparing adsorbent by using product obtained after one-time exothermic bonding reaction and application - Google Patents
Method for preparing adsorbent by using product obtained after one-time exothermic bonding reaction and application Download PDFInfo
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- CN112354515A CN112354515A CN202010810466.3A CN202010810466A CN112354515A CN 112354515 A CN112354515 A CN 112354515A CN 202010810466 A CN202010810466 A CN 202010810466A CN 112354515 A CN112354515 A CN 112354515A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000047 product Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 16
- 150000002500 ions Chemical class 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- -1 arsenic ions Chemical class 0.000 claims abstract description 8
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 7
- 239000010865 sewage Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 4
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- 239000011505 plaster Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000005672 electromagnetic field Effects 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 239000010455 vermiculite Substances 0.000 claims description 3
- 229910052902 vermiculite Inorganic materials 0.000 claims description 3
- 235000019354 vermiculite Nutrition 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 27
- 229910001868 water Inorganic materials 0.000 abstract description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 4
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- 231100000003 human carcinogen Toxicity 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- RLJMLMKIBZAXJO-UHFFFAOYSA-N lead nitrate Chemical compound [O-][N+](=O)O[Pb]O[N+]([O-])=O RLJMLMKIBZAXJO-UHFFFAOYSA-N 0.000 description 1
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/046—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing halogens, e.g. halides
-
- 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
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
-
- 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
-
- 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
- C02F2101/103—Arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
In the method for preparing the adsorbent by using the product after the one-time heat release paste reaction and the application thereof, the residue after the one-time heat release paste reaction with high iron oxide and carbon concentration is used as the adsorbent for wastewater discharge treatment. The adsorbent can adsorb heavy metal substances while purifying water, expands the application of a reaction product of the disposable heat-releasing paste, solves the environmental problem caused by dumping waste of the disposable heat-releasing paste, has low processing and treating cost, has good adsorption capacity on lead ions and arsenic ions in sewage, and realizes the reutilization of resources.
Description
Technical Field
The invention relates to the technical field of waste resource utilization, in particular to a method for preparing an adsorbent by using a product obtained by a one-time exothermic bonding reaction and application thereof.
Background
Lead is a common heavy metal pollution, and the main sources are industries such as mining, metallurgy, coating and the like. The damage of lead and lead compounds to human body is mainly reflected in hematopoiesis, cardiovascular and nervous system, and the like, and mainly influences the physiological function of human body by blocking the synthesis of hemoglobin and hemolysis, spasm and other effects, if the daily intake of lead in the human body is more than 0.3mg, lead can be accumulated in the human body, and further anemia, nervous system diseases and damage to liver and kidney are caused.
Arsenic pollution of water is a global environmental problem to be solved urgently. Arsenic compounds cannot be easily destroyed and can only be converted to different forms or to insoluble compounds. The elemental arsenic itself has low direct toxicity to organisms, and is hardly absorbed and discharged after entering the bodies due to low solubility, but the elemental arsenic has unreasonable harm to the bodies after being oxidized to form highly toxic oxides. The general toxic effects of arsenic and its compounds can be divided into two categories: one is acute or subacute arsenic poisoning, which can cause vomit, abdominal pain, even coma, myocarditis, acute renal failure and other body diseases; the other is chronic arsenic poisoning, mainly chronic systemic diseases which are mainly characterized by skin lesion and canceration and caused by long-term drinking of high-arsenic water by residents in specific geographic environments. In addition, the long-term toxic effects of arsenic and its compounds include carcinogenesis, aberration and mutation. The harm of arsenic and compounds thereof cannot be predicted, is one of the only carcinogens which have not been reproduced on animals until now, and is confirmed as a human carcinogen by the international cancer research institution in 1981.
With the increasing demand of disposable heat release patch on the world, China has reached 100 ten thousand tablets per day nowadays, and the annual sales volume in China is about 5 hundred million tablets. The disposable heat-releasing paste contains polymer synthesized by iron powder, active carbon, inorganic salt, water and the like, and the iron powder in the raw materials has the basic iron powder content of 68-85 percent due to different manufacturer contents. After the disposable heat-release patch is used, the surface of the iron powder can be oxidized, and other components basically can not be changed. At present, the disposable waste heat-releasing plaster is basically in an unsupervised state, unattended state and directly discarded by people as common solid waste.
Disclosure of Invention
The invention aims to provide a method for preparing an adsorbent by using a product obtained after a one-time exothermic adhesive reaction and application thereof.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
the method for preparing the adsorbent by using the product after the reaction of the disposable heat release patch comprises the following steps:
A. naturally cooling a product obtained after the reaction of the contents of the disposable heat release patch, and fully grinding the product into powder of 100-350 meshes;
B. adding deionized water and soaking the powder for 10min, wherein the weight parts of solid powder is 1-3, and the weight parts of deionized water is 1-10, and dissolving soluble salts;
C. applying a magnetic field with the strength of more than 80mT to the mixture of the powder and the deionized water, separating and sucking unreacted iron powder from the mixture, and carrying out solid-liquid separation on the residual solid and liquid;
D. adding deionized water to clean the residual solid;
E. and drying the residual solid substance to obtain the adsorbent.
The invention can also adopt the following technical measures:
the contents of the disposable heat release patch comprise active carbon, reduced iron powder, sodium chloride and vermiculite.
The magnetic field is an electromagnetic field or is generated by a magnet.
And D, drying at the temperature of 10-300 ℃ in the step E.
The adsorbent prepared by utilizing the product after the disposable exothermic reaction is applied to the treatment of the sewage containing lead ions Pb (II).
The adsorbent prepared by using the product after the disposable exothermic adhesive reaction is applied to the treatment of the sewage containing arsenic ions As (V).
The invention has the advantages and positive effects that:
in the method for preparing the adsorbent by using the product after the disposable exothermic pad reaction, the residue after the disposable exothermic pad reaction with high iron oxide and carbon concentration is used as the adsorbent for wastewater discharge treatment. The adsorbent can adsorb heavy metal substances while purifying water, expands the application of a reaction product of the disposable heat-releasing paste, solves the environmental problem caused by dumping waste of the disposable heat-releasing paste, has low processing and treating cost, has good adsorption capacity on lead ions and arsenic ions in sewage, and realizes the reutilization of resources.
Drawings
FIG. 1 is a thermodynamic diagram of adsorption of lead and arsenic ions by an adsorbent prepared from the reaction product of a disposable exothermic patch;
FIG. 2 is a graph of adsorption kinetics for adsorption of lead and arsenic ions using an adsorbent prepared from the post-reaction product of a disposable exothermic patch;
FIG. 3 is a graph comparing the effect of the adsorbent prepared by using the product of the one-time exothermic reaction for adsorbing lead and arsenic ions under different pH conditions.
In FIG. 1, the abscissa represents ion concentration (mg/L) and the ordinate represents adsorption capacity (mg/g);
in FIG. 2, the abscissa is time (min), and the ordinate is adsorption capacity (mg/g);
in fig. 3, the abscissa represents pH and the ordinate represents adsorption efficiency (%).
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
The method for preparing the adsorbent by using the product after the reaction of the disposable heat release patch comprises the following steps:
A. naturally cooling a product obtained after the reaction of the contents of the disposable heat release patch, and fully grinding the product into powder of 100-350 meshes;
B. adding deionized water and soaking the powder for 10min, wherein the weight parts of solid powder is 1-3, and the weight parts of deionized water is 1-10, and dissolving soluble salts;
C. applying a magnetic field with the strength of more than 80mT to the mixture of the powder and the deionized water, separating and sucking unreacted iron powder from the mixture, and carrying out solid-liquid separation on the residual solid and liquid;
D. adding deionized water to clean the residual solid;
E. and drying the residual solid substance to obtain the adsorbent.
The components of the contents of the disposable heat release patch comprise activated carbon, reduced iron powder, sodium chloride and vermiculite.
The magnetic field is an electromagnetic field or generated by a magnet to separate iron powder in the mixture.
And E, drying at the temperature of 10-300 ℃.
The effectiveness of the above adsorbents was verified as follows:
preparation of heavy metal ion solution: 1g of lead nitrate solid was dissolved in 1L of ultrapure water to prepare a Pb (II) base solution having a concentration of 1 g/L. In the following experiments, the base solution was gradually diluted to the desired concentration with ultrapure water. Similarly, the laboratory-available As (V) solution was diluted stepwise to the concentration required for the experiment.
Adsorption thermodynamics experiment: first, in order to investigate the influence of the adsorption capacity, preliminary experiments were performed. A sample of 20mg of 20mL of an initial 1-500 ppm As (V) solution was taken for 48 hours and the pH of the solution was adjusted to 7.0. + -. 0.1 using 1mol L-1 and 0.1mol L-1 NaOH or HCl. A sample of 20mg of 20mL of a Pb (II) solution having an initial concentration of 10 to 800ppm was taken and the solution was adjusted to pH 6.0. + -. 0.1 using 1mol of L-1 and 0.1mol of L-1 NaOH or HCl for 48 hours. After stringent mixing, the tube was continuously shaken with a platform shaker, operating at 200 rpm. The lead remaining in the aqueous phase was then analyzed using a continuous light source atomic absorption spectrometer and the remaining arsenic content was tested using inductively coupled plasma mass spectrometry (ICP-MS).
In fig. 1, the maximum adsorption amount of the material to the ions is determined according to the adsorption thermodynamics of the two ions, and adsorption isotherm data is analyzed by fitting Langmuir and Freundlich isothermal models. The results show that the adsorption process of both ions fits better to the Langmuir model, indicating a uniform monolayer adsorption process. Using the Langmuir model, the maximum adsorption amounts of Pb (II) and As (V) were 588mg/g and 130mg/g, indicating that the warm patch sample in this study has a strong saturated absorption capacity.
Adsorption kinetics experiment: 20mg of the powdery material were taken and put into 20mL sample bottles of 500ppm Pb (II) and 200ppm As (V) ion solutions, respectively, and shaken on a platform shaker. The total reaction time was 12h, samples were taken every 10 minutes for the first hour, followed by samples taken every hour. After completion the sample was tested for remaining ion concentration.
In fig. 2, all samples had fast adsorption kinetics and reached equilibrium within 5 hours. And fitting the adsorption rate experimental data to pseudo-first and pseudo-second order kinetic models, the results being reported as a function of adsorbent adsorption capacity (Qe) and time (t). The results show that the adsorption capacity of the pseudo second order model is very close to the experimental value, which indicates that the kinetics of the adsorption of Pb (II) and As (V) on the warm patch material follow the pseudo second order model, i.e., the adsorption of Pb (II) and As (V) is a chemisorption process.
In fig. 3, the adsorption efficiencies of two ions under different pH conditions are compared. Wherein, the lead ion adsorption effect is best under the condition of pH 5, and the adsorption efficiency is about 75%; the effect of adsorbing arsenic ions under an acidic condition is better, and the adsorption efficiency is about 80 percent.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method for preparing an adsorbent by using a product obtained after a one-time exothermic adhesive reaction is characterized by comprising the following steps of:
A. naturally cooling a product obtained after the reaction of the contents of the disposable heat release patch, and fully grinding the product into powder of 100-350 meshes;
B. adding deionized water and soaking the powder for 10min, wherein the weight parts of solid powder is 1-3, and the weight parts of deionized water is 1-10, and dissolving soluble salts;
C. applying a magnetic field with the strength of more than 80mT to the mixture of the powder and the deionized water, separating and sucking unreacted iron powder from the mixture, and carrying out solid-liquid separation on the residual solid and liquid;
D. adding deionized water to clean the residual solid;
E. and drying the residual solid substance to obtain the adsorbent.
2. The method for preparing the adsorbent by using the post-reaction product of the disposable exothermic plaster according to claim 1, wherein: the components of the contents of the disposable heat release patch comprise activated carbon, reduced iron powder, sodium chloride and vermiculite.
3. The method for preparing the adsorbent by using the post-reaction product of the disposable exothermic plaster according to claim 2, wherein: the magnetic field is an electromagnetic field or generated by a magnet.
4. The method for preparing the adsorbent by using the post-reaction product of the disposable exothermic plaster according to claim 3, wherein: and E, drying at the temperature of 10-300 ℃.
5. An application of an adsorbent prepared by using a product after a one-time exothermic paste reaction in the treatment of sewage containing lead ions Pb (II).
6. An application of an adsorbent prepared by using a product obtained after a disposable exothermic adhesive reaction in the treatment of sewage containing arsenic ions As (V).
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Cited By (1)
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2020
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