CN111569823A - Method for removing arsenic by adsorbing iron-manganese oxide/mesoporous silicon oxide adsorbent - Google Patents
Method for removing arsenic by adsorbing iron-manganese oxide/mesoporous silicon oxide adsorbent Download PDFInfo
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- CN111569823A CN111569823A CN202010442509.7A CN202010442509A CN111569823A CN 111569823 A CN111569823 A CN 111569823A CN 202010442509 A CN202010442509 A CN 202010442509A CN 111569823 A CN111569823 A CN 111569823A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 70
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000003463 adsorbent Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910052814 silicon oxide Inorganic materials 0.000 title abstract description 10
- WQHONKDTTOGZPR-UHFFFAOYSA-N [O-2].[O-2].[Mn+2].[Fe+2] Chemical compound [O-2].[O-2].[Mn+2].[Fe+2] WQHONKDTTOGZPR-UHFFFAOYSA-N 0.000 title description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 87
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 14
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims description 26
- 239000002253 acid Substances 0.000 claims description 25
- 239000007787 solid Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 20
- 239000000706 filtrate Substances 0.000 claims description 19
- 239000002699 waste material Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 5
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 5
- 229910052603 melanterite Inorganic materials 0.000 claims description 5
- 239000012286 potassium permanganate Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 16
- 238000001179 sorption measurement Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 238000011068 loading method Methods 0.000 abstract description 3
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000001291 vacuum drying Methods 0.000 description 8
- 238000003723 Smelting Methods 0.000 description 7
- 231100000419 toxicity Toxicity 0.000 description 7
- 230000001988 toxicity Effects 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000002386 leaching Methods 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 231100000820 toxicity test Toxicity 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 208000007443 Neurasthenia Diseases 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
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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
- B01J20/02—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
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28078—Pore diameter
- B01J20/28083—Pore diameter being in the range 2-50 nm, i.e. mesopores
-
- 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
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Nanotechnology (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to a method for removing arsenic by adsorbing a ferro-manganese oxide/mesoporous silicon oxide adsorbent, belonging to the technical field of heavy metal pollution treatment. The invention uses mesoporous silicon dioxide as a carrier and loads the ferrimanganic oxide to prepare the ferrimanganic oxide/mesoporous silicon oxide adsorbent, the addition of the mesoporous silicon dioxide reduces the agglomeration effect of the ferrimanganic oxide, and the loading of the ferrimanganic oxide by using the silicon dioxide as the carrier can improve the porosity and the corresponding dearsenification efficiency of the adsorbent. The preparation method of the ferrimanganic oxide/mesoporous silica adsorbent is simple, the arsenic solution is large in adsorption capacity, the adsorption rate is high, and the application prospect is wide.
Description
Technical Field
The invention relates to a method for removing arsenic by adsorbing a ferro-manganese oxide/mesoporous silicon oxide adsorbent, belonging to the technical field of heavy metal pollution treatment.
Background
Arsenic and arsenide have toxicity and potential danger to human beings, animals and plants, and can form high-toxicity compounds which can be absorbed by human bodies from respiratory tracts, skins and digestive tracts and can cause neurasthenia syndrome; meanwhile, arsenic can be released from minerals to enter underground water and soil through weathering, so that water sources in China are affected; secondly, the steel output in China is very large, and a large amount of arsenic-containing waste water is generated during the steel production, so that the treatment of the arsenic-containing waste water has important significance in the aspect of treating water pollution.
In the wastewater generated by copper smelting, the arsenic content is high or low, the treatment effect of the high arsenic content by a chemical method is obvious, and the low arsenic content can be treated by a physical adsorption method. The common adsorption method comprises iron salt coagulation method, natural zeolite arsenic removal method, resin adsorption arsenic removal method and the like. The methods have very limited arsenic removal rate, and some methods are only suitable for adsorbing a small amount of arsenic in water and are not suitable for large-scale application.
Disclosure of Invention
The invention provides a method for adsorbing and removing arsenic by using a ferrimanganic oxide/mesoporous silicon oxide adsorbent, aiming at the problems in the prior art, namely, the ferrimanganic oxide/mesoporous silicon oxide adsorbent is prepared by using mesoporous silicon dioxide as a carrier and loading ferrimanganic oxide, the agglomeration effect of the ferrimanganic oxide is reduced by adding the mesoporous silicon dioxide, and the porosity and corresponding arsenic removal efficiency of the adsorbent can be improved by using the silicon dioxide as the carrier and loading the ferrimanganic oxide; the ferrimanganic oxide/mesoporous silicon oxide adsorbent has large adsorption capacity on arsenic, high adsorption rate and wide application prospect.
A method for removing arsenic by adsorbing a ferro-manganese oxide/mesoporous silica adsorbent comprises the following specific steps:
(1) adding mesoporous silica into deionized water, and performing ultrasonic dispersion to obtain a mesoporous silica suspension;
(2) adjusting the pH value of the mesoporous silica suspension in the step (1) to 7-8;
(3) adding KMnO into the mesoporous silica suspension in the step (2)4And FeSO4·7H2O, uniformly mixing to obtain a mixture A, reacting the mixture A for 2-3 h at the temperature of 55-65 ℃, cooling to room temperature, and standing for 12-14 h to obtain a mixed solution B;
(4) solid-liquid separation is carried out on the mixed solution B in the step (3), and the solid is washed by deionized water and dried in vacuum to obtain the ferrimanganic oxide/mesoporous silica adsorbent;
(5) and (3) mixing the ferrimanganic oxide/mesoporous silica adsorbent obtained in the step (4) with contaminated acid, reacting for 12-14 h at the temperature of 40-50 ℃ under the stirring condition, performing solid-liquid separation to obtain arsenic-containing solid and filtrate, stacking the arsenic-containing solid, and performing deep arsenic removal treatment on the filtrate.
The solid-to-liquid ratio mg/mL of the mesoporous silica to the deionized water in the step (1) is 1 (0.9-1.1);
preferably, the ultrasonic dispersion time in the step (1) is 0.5-1 h;
the step (3) of KMnO4The mass ratio of the mesoporous silica to the mesoporous silica in the mesoporous silica suspension is (0.5-0.7) 1, and FeSO4·7H2The mass ratio of O to the mesoporous silica in the mesoporous silica suspension is (0.4-0.6): 1;
preferably, the vacuum drying temperature in the step (4) is 60-70 ℃, and the vacuum drying time is 10-12 hours;
in the step (5), the solid-to-liquid ratio g: mL of the ferrimanganic oxide/mesoporous silica adsorbent to the waste acid is 4 (15-20);
the arsenic content in the waste acid is 2000.0-4500.0 mg/L;
preferably, the stirring speed in the step (5) is 600-800 r/min.
The invention has the beneficial effects that:
(1) the invention uses mesoporous silicon dioxide as a carrier and loads ferro-manganese oxide to prepare ferro-manganese oxide/mesoporous silicon oxide adsorbent, the addition of the mesoporous silicon dioxide reduces the agglomeration effect of the ferro-manganese oxide, and the load of the ferro-manganese oxide with the silicon dioxide as the carrier can improve the porosity and corresponding dearsenification efficiency of the adsorbent;
(2) the invention utilizes the ferro-manganese oxide/mesoporous silicon oxide as a novel adsorbent to adsorb and remove arsenic, the ferro-manganese oxide contains rich Fe and Mn and can generate complex reaction with arsenic in waste acid; the ferro-manganese oxide is loaded on the mesoporous silicon dioxide, so that the porosity of the adsorbent can be greatly improved, and the adsorption quantity of arsenic is increased; meanwhile, the adsorbent is simple to prepare, has large arsenic saturation adsorption capacity and high adsorption rate, and has wide application prospect.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.
Example 1: in the embodiment, the waste acid is generated after the smelting flue gas is washed by a sulfuric acid workshop of a certain zinc smelting plant in the southwest region, and the main components of the waste acid containing a large amount of impurities such as arsenic and the like are shown in table 1;
TABLE 1 dirty acid composition
A method for removing arsenic by adsorbing a ferro-manganese oxide/mesoporous silica adsorbent comprises the following specific steps:
(1) adding mesoporous silica into deionized water, and performing ultrasonic dispersion for 0.5h to obtain mesoporous silica suspension; wherein the solid-to-liquid ratio mg/mL of the mesoporous silica to the deionized water is 1: 1.1;
(2) adjusting the pH value of the mesoporous silica suspension in the step (1) to 7;
(3) adding KMnO into the mesoporous silica suspension in the step (2)4And FeSO4·7H2O, mixing to obtain mixture A, and mixingReacting the substance A at 65 ℃ for 3h, cooling to room temperature, and standing for 12h to obtain a mixed solution B; wherein KMnO4The mass ratio of the mesoporous silicon dioxide to the mesoporous silicon dioxide in the mesoporous silicon dioxide suspension is 0.5:1, and the content of FeSO4·7H2The mass ratio of O to the mesoporous silica in the mesoporous silica suspension is 0.6: 1;
(4) solid-liquid separation is carried out on the mixed solution B in the step (3), and the solid is washed by deionized water and dried in vacuum to obtain the ferrimanganic oxide/mesoporous silica adsorbent; wherein the vacuum drying temperature is 70 ℃, and the vacuum drying time is 10 h;
(5) mixing the ferrimanganic oxide/mesoporous silica adsorbent in the step (4) with waste acid, reacting for 12 hours at the temperature of 50 ℃ under the condition of stirring, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, piling up the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate; wherein the solid-to-liquid ratio g/mL of the iron-manganese oxide/mesoporous silica adsorbent to the waste acid is 4:15, the arsenic content of the waste acid is 2000.0mg/L, and the stirring speed is 800 r/min;
carrying out toxicity leaching test on the arsenic-containing solid;
toxicity Leaching tests of arsenic-containing solids were performed according to U.S. epa Method 1311-toxicity charateristic leach Procedure, provided by the united states environmental protection agency, with toxicity test results as shown in table 2,
TABLE 2 toxic leach results for arsenic-containing solids
The filtrate composition is shown in Table 3;
TABLE 3 filtrate composition
In the filtrate of this example, the arsenic content was 89.6mg/L, and the removal rate of arsenic was 95.52%.
Example 2: in the embodiment, the waste acid is generated after the smelting flue gas is washed by a sulfuric acid workshop of a certain zinc smelting plant in the southwest region, and the main components of the waste acid containing a large amount of impurities such as arsenic and the like are shown in table 4;
TABLE 4 dirty acid composition
A method for removing arsenic by adsorbing a ferro-manganese oxide/mesoporous silica adsorbent comprises the following specific steps:
(1) adding mesoporous silica into deionized water, and performing ultrasonic dispersion for 1.0h to obtain mesoporous silica suspension; wherein the solid-to-liquid ratio mg/mL of the mesoporous silica to the deionized water is 1: 0.9;
(2) adjusting the pH value of the mesoporous silica suspension in the step (1) to 8;
(3) adding KMnO into the mesoporous silica suspension in the step (2)4And FeSO4·7H2O, uniformly mixing to obtain a mixture A, reacting the mixture A for 2 hours at the temperature of 55 ℃, cooling to room temperature, and standing for 14 hours to obtain a mixed solution B; wherein KMnO4The mass ratio of the mesoporous silica to the mesoporous silica in the mesoporous silica suspension is 0.7:1, and the mass ratio of the mesoporous silica to the mesoporous silica in the mesoporous silica suspension is FeSO4·7H2The mass ratio of O to the mesoporous silica in the mesoporous silica suspension is 0.4: 1;
(4) solid-liquid separation is carried out on the mixed solution B in the step (3), and the solid is washed by deionized water and dried in vacuum to obtain the ferrimanganic oxide/mesoporous silica adsorbent; wherein the vacuum drying temperature is 60 ℃, and the vacuum drying time is 12 h;
(5) mixing the ferrimanganic oxide/mesoporous silica adsorbent in the step (4) with waste acid, reacting for 14 hours at the temperature of 40 ℃ under the condition of stirring, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, stacking the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate; wherein the solid-to-liquid ratio g/mL of the iron-manganese oxide/mesoporous silica adsorbent to the waste acid is 4:20, the arsenic content of the waste acid is 3200.0mg/L, and the stirring speed is 600 r/min;
carrying out toxicity leaching test on the arsenic-containing solid;
toxicity Leaching tests of arsenic-containing solids were performed according to U.S. epa Method 1311-toxicitycharateristic leach Procedure, provided by the united states environmental protection agency, with toxicity test results as shown in table 5,
TABLE 5 toxic leach results for arsenic-containing solids
The filtrate composition is shown in Table 6;
TABLE 6 filtrate composition
In the filtrate of this example, the arsenic content was 167.2mg/L, and the removal rate of arsenic was 94.8%.
Example 3: in the embodiment, the waste acid is generated after the smelting flue gas is washed by a sulfuric acid workshop of a certain zinc smelting plant in southwest, and the main components of the waste acid containing a large amount of impurities such as arsenic are shown in table 7;
TABLE 7 dirty acid composition
A method for removing arsenic by adsorbing a ferro-manganese oxide/mesoporous silica adsorbent comprises the following specific steps:
(1) adding mesoporous silica into deionized water, and performing ultrasonic dispersion for 0.75h to obtain mesoporous silica suspension; wherein the solid-to-liquid ratio mg/mL of the mesoporous silica to the deionized water is 1: 1.0;
(2) adjusting the pH value of the mesoporous silica suspension in the step (1) to 7.5;
(3) adding KMnO into the mesoporous silica suspension in the step (2)4And FeSO4·7H2O, uniformly mixing to obtain a mixture A, reacting the mixture A for 2.5 hours at the temperature of 60 ℃, cooling to room temperature, and standing for 11 hours to obtain a mixed solution B; wherein KMnO4The mass ratio of the mesoporous silicon dioxide to the mesoporous silicon dioxide in the mesoporous silicon dioxide suspension is 0.6:1, and the content of FeSO4·7H2The mass ratio of O to the mesoporous silica in the mesoporous silica suspension is 0.5: 1;
(4) solid-liquid separation is carried out on the mixed solution B in the step (3), and the solid is washed by deionized water and dried in vacuum to obtain the ferrimanganic oxide/mesoporous silica adsorbent; wherein the vacuum drying temperature is 65 ℃, and the vacuum drying time is 11 h;
(5) mixing the ferrimanganic oxide/mesoporous silica adsorbent in the step (4) with contaminated acid, reacting for 13 hours at the temperature of 45 ℃ under stirring, carrying out solid-liquid separation to obtain arsenic-containing solid and filtrate, stacking the arsenic-containing solid, and carrying out deep arsenic removal treatment on the filtrate; wherein the solid-to-liquid ratio g/mL of the iron-manganese oxide/mesoporous silica adsorbent to the waste acid is 4:17, the arsenic content of the waste acid is 4500.0mg/L, and the stirring speed is 700 r/min;
carrying out toxicity leaching test on the arsenic-containing solid;
toxicity Leaching tests of arsenic-containing solids were performed according to U.S. epa Method 1311-toxicitycharateristic leach Procedure, provided by the united states environmental protection agency, with toxicity test results as shown in table 8,
TABLE 8 toxic leach results for arsenic-containing solids
The filtrate composition is shown in Table 9;
TABLE 9 filtrate composition
In the filtrate of this example, the arsenic content was 202.4mg/L, and the removal rate of arsenic was 95.5%.
Claims (5)
1. A method for removing arsenic by adsorbing a ferro-manganese oxide/mesoporous silica adsorbent is characterized by comprising the following specific steps:
(1) adding mesoporous silica into deionized water, and performing ultrasonic dispersion to obtain a mesoporous silica suspension;
(2) adjusting the pH value of the mesoporous silica suspension in the step (1) to 7-8;
(3) in the step (2), mesoporous silicaKMnO is added into the suspension4And FeSO4·7H2O, uniformly mixing to obtain a mixture A, reacting the mixture A for 2-3 h at the temperature of 55-65 ℃, cooling to room temperature, and standing for 12-14 h to obtain a mixed solution B;
(4) solid-liquid separation is carried out on the mixed solution B in the step (3), and the solid is washed by deionized water and dried in vacuum to obtain the ferrimanganic oxide/mesoporous silica adsorbent;
(5) and (3) mixing the ferrimanganic oxide/mesoporous silica adsorbent obtained in the step (4) with contaminated acid, reacting for 12-14 h at the temperature of 40-50 ℃ under the stirring condition, performing solid-liquid separation to obtain arsenic-containing solid and filtrate, stacking the arsenic-containing solid, and performing deep arsenic removal treatment on the filtrate.
2. The method for removing arsenic by adsorbing with the ferrimanganic oxide/mesoporous silica adsorbent according to claim 1, wherein: in the step (1), the solid-to-liquid ratio mg/mL of the mesoporous silica to the deionized water is 1 (0.9-1.1).
3. The method for removing arsenic by adsorbing with the ferrimanganic oxide/mesoporous silica adsorbent according to claim 1, wherein: step (3) KMnO4The mass ratio of the mesoporous silica to the mesoporous silica in the mesoporous silica suspension is (0.5-0.7) 1, and FeSO4·7H2The mass ratio of O to the mesoporous silica in the mesoporous silica suspension is (0.4-0.6): 1.
4. The method for removing arsenic by adsorbing with the ferrimanganic oxide/mesoporous silica adsorbent according to claim 1, wherein: and (5) the solid-to-liquid ratio g: mL of the ferrimanganic oxide/mesoporous silica adsorbent to the waste acid is 4 (15-20).
5. The method for removing arsenic by adsorbing with the ferrimanganic oxide/mesoporous silica adsorbent according to claim 3, wherein: the arsenic content in the waste acid is 2000.0-4500.0 mg/L.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113000012A (en) * | 2021-03-18 | 2021-06-22 | 大连理工大学 | Arsenic removal adsorption material, preparation method thereof and application of arsenic removal adsorption material in removal of As (III) in acidic wastewater |
| CN116116377A (en) * | 2023-01-10 | 2023-05-16 | 中国铁工投资建设集团有限公司 | Preparation method and application of attapulgite adsorbent loaded with bimetallic oxide |
Citations (8)
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