CN113856621A - Preparation and application of an iron-sulfur co-doped biochar for simultaneous removal of lead and arsenic composite pollution - Google Patents
Preparation and application of an iron-sulfur co-doped biochar for simultaneous removal of lead and arsenic composite pollution Download PDFInfo
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- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 title claims abstract description 37
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 title claims abstract description 37
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 32
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000010902 straw Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 15
- HUEBVZADHUOMHL-UHFFFAOYSA-N [As].[Pb] Chemical compound [As].[Pb] HUEBVZADHUOMHL-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims abstract description 14
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 13
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 13
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 13
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 13
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims abstract description 12
- 235000019345 sodium thiosulphate Nutrition 0.000 claims abstract description 12
- 238000001354 calcination Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 229910052742 iron Inorganic materials 0.000 claims description 14
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- 235000009566 rice Nutrition 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 239000012298 atmosphere Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 239000011363 dried mixture Substances 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims 1
- 238000007873 sieving Methods 0.000 claims 1
- 238000003756 stirring Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000010842 industrial wastewater Substances 0.000 abstract 1
- 150000002611 lead compounds Chemical class 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 15
- 229910052717 sulfur Inorganic materials 0.000 description 15
- 239000011593 sulfur Substances 0.000 description 15
- 239000000243 solution Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 10
- 238000000197 pyrolysis Methods 0.000 description 9
- 241000209094 Oryza Species 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 8
- 239000002351 wastewater Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 238000004108 freeze drying Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
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- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000701 toxic element Toxicity 0.000 description 1
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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
- B01J20/20—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
- C02F1/283—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
- 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
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- Hydrology & Water Resources (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Removal Of Specific Substances (AREA)
Abstract
本发明涉及一种用于同时去除砷铅复合污染的铁硫共掺杂生物炭材料的制备及应用。其中所述铁硫共掺杂生物炭材料是由秸秆粉末以及含硫酸亚铁、硫代硫酸钠的悬浊液按固液比为（7~12）g:100mL的比例经过10~36小时磁力搅拌充分混合，冷冻干燥后在250~450℃热解1~3小时而得。所述悬浊液中硫酸亚铁和硫代硫酸钠摩尔比为（0.7~2）：1。所述铁硫共掺杂生物炭能同时高效吸附复合污染水体中的砷铅，24小时内对As(Ⅲ)的最佳去除率达96%以上，对Pb(Ⅱ)的去除率达93%以上；且在pH为3~6条件下对As(Ⅲ)和Pb(Ⅱ)的去除率均能保持在90%以上。本发明所述铁硫共掺杂生物炭是通过原料浸渍后一次煅烧而得，操作简单且对砷铅去除效果显著，对于砷铅复合污染的工业废水治理具有实际意义。The invention relates to the preparation and application of an iron-sulfur co-doped biochar material for simultaneously removing arsenic-lead composite pollution. The iron-sulfur co-doped biochar material is made of straw powder and a suspension containing ferrous sulfate and sodium thiosulfate at a solid-liquid ratio of (7~12) g:100mL after 10~36 hours of magnetic force Stir well to mix, freeze-dry and then pyrolyze at 250~450℃ for 1~3 hours. The molar ratio of ferrous sulfate and sodium thiosulfate in the suspension is (0.7~2):1. The iron-sulfur co-doped biochar can efficiently adsorb arsenic and lead in composite polluted water at the same time, and the optimal removal rate of As(III) within 24 hours is over 96%, and the removal rate of Pb(II) is 93%. The removal rate of As(III) and Pb(II) can be maintained above 90% under the condition of pH 3~6. The iron-sulfur co-doped biochar of the present invention is obtained by impregnating raw materials and then calcining once, the operation is simple, and the removal effect of arsenic and lead is remarkable, and it has practical significance for the treatment of industrial wastewater with arsenic and lead compound pollution.
Description
Technical Field
The invention belongs to the technical field of heavy metal treatment, and relates to preparation and application of a modified biochar material for simultaneously removing lead-arsenic composite pollution.
Background
Lead and arsenic are widely present in the natural world, and as the second five toxic element (cadmium, mercury, arsenic, lead, chromium), the influence on the environment and human health safety is widely concerned. The arsenic-lead composite pollution in water is mainly generated in the industrial processes of smelting, mining, electroplating and the like. Trivalent arsenic As (III) in water has higher toxicity, mobility and solubility. Lead is usually present in the wastewater in the form of Pb (ii). The arsenic-lead composite pollution is not easy to be chemically or biologically degraded, can be enriched in a human body by being taken, and has great harm to organs of the human body, such as stomach, intestinal tract, liver, kidney and the like. In order to mitigate the effects of arsenic-lead co-pollution on human health, the World Health Organization (WHO) established that the international maximum pollution level of arsenic in drinking water is 10 ppb and lead is 10 ppb. Therefore, remediation of arsenic and lead contamination in aqueous solutions is critical.
At present, a variety of purification techniques such As chemical precipitation, electrochemical treatment, membrane separation, ion exchange and adsorption have been used to treat As (III) and Pb (II) in wastewater. Compared with the chemical precipitation method, the method has the limitations of large amount of sludge generation, high cost of electrochemical and membrane separation and the like, and the adsorption is considered to be one of the technologies with the most application prospect due to the special advantages of simple operation, high cost benefit, no need of sludge treatment and the like.
Biochar prepared from agricultural wastes such as straws has the advantages of developed pore structure, stable fat chain structure, wide source and the like, and is widely used as an economic adsorbent. Compared with unmodified biochar, the iron-based and sulfur-based modified biochar has better adsorption capacity to As (III) and Pb (II). Research has been carried out to confirm the feasibility of carrying iron and sulfur together with charcoal: (1) chinese patent application (publication No. CN 111229160A) proposes a preparation method of biochar simultaneously carrying ferrous sulfide and zero-valent iron, which is obtained by subjecting fired corn straw biochar to hydrophilic treatment and then continuously stirring with ferrous sulfate and sodium sulfide in an anaerobic condition, so that the material has good adsorption performance on lead in wastewater. However, the method only considers the removal of lead by materials singly, and the application range is quite limited because the combined pollution of various heavy metals usually exists in the actual wastewater. (2) Chinese patent application (publication No. CN 111925806A) proposes a preparation method of a sulfur-doped nano ferroferric oxide/biochar composite material, ferroferric oxide load and sulfur modification are combined, so that the material has high-efficiency adsorption performance on arsenic and lead, but the preparation process needs multiple times of high-temperature calcination, the sulfur modification process needs continuous stirring in an anaerobic environment, the procedure is complicated, the cost is high, the requirement on preparation conditions is strict, and the large-scale production in practical application is not facilitated.
Disclosure of Invention
Just like most of the existing iron and sulfur co-doped materials, the zero-valent iron sulfide, the nano iron sulfide and the like have the problems of easy oxidation, agglomeration and the like, nitrogen is introduced and calcination is carried out for many times in the preparation process, the generated material is very easy to oxidize and needs anaerobic storage, the preparation conditions are harsh, the cost is high, and only the removal of single heavy metal is usually considered. In order to overcome the problems, the invention provides a preparation method and an application method of iron-sulfur co-doped biochar which can simultaneously load iron-based and sulfur-based functional groups on biochar through one-time calcination and can simultaneously and efficiently remove arsenic and lead pollution. Through repeated experimental research, the invention creatively utilizes the reaction of ferrous sulfate and sodium thiosulfate in the process of soaking the biomass, so that iron oxide and iron sulfide can be loaded on the biochar through calcination, and the final product is stable and easy to store and has the capability of efficiently removing arsenic and lead.
The invention provides a preparation method of a modified biochar material for simultaneously removing lead-arsenic composite pollution, which comprises the following steps: the modified biochar material is iron and sulfur co-doped biochar formed by pyrolyzing ferrous sulfate, sodium thiosulfate and biomass. And (3) fully mixing the straw powder with the suspension of ferrous sulfate and sodium thiosulfate through magnetic stirring, freeze-drying, calcining at 250-450 ℃ in a protective atmosphere, and keeping the temperature for 1-3 hours to obtain a pyrolysis product, namely the iron-sulfur co-doped biochar.
In one embodiment, the straw selected is rice straw.
In a specific embodiment, the solid-to-liquid ratio of the rice straw powder to the suspension is 5-15 g:100mL, preferably 7-12 g:100 mL.
In one embodiment, the molar ratio of ferrous sulfate to sodium thiosulfate in the suspension is controlled to be 0.5-2.5: 1, preferably 0.7-2: 1.
preferably, the suspension is freeze-dried after being magnetically stirred for 10 to 36 hours.
Preferably, the temperature rise rate is controlled to be 5-10 ℃/min during pyrolysis.
Preferably, the pyrolysis is carried out at 250-450 ℃ and the temperature is kept for 1-3 hours.
Preferably, the pyrolysis product is dried after washing impurities with deionized water.
The invention also provides application of the iron-sulfur co-doped biochar material in arsenic-lead composite polluted water. Further, adding the modified biochar into the As (III) and Pb (II) composite polluted wastewater according to 1-3 g/L for oscillation reaction, performing adsorption treatment, and measuring the concentrations of As (III) and Pb (II) by using the solution before and after the reaction.
Preferably, the application of the material in the As (III) and Pb (II) composite solution adjusts the initial pH value of the material to be 2-7, preferably 3-6.
Compared with the prior art, the invention has the following advantages: according to the invention, the straw powder, the suspension mixed by ferrous sulfate and sodium thiosulfate are fully soaked and mixed, and then the iron-sulfur co-doped biochar can be obtained through one-time calcination, so that the operation is simple, the cost is low, and the large-scale production and practical application are facilitated. The iron-sulfur co-doped biochar prepared by the invention can simultaneously and efficiently remove As (III) and Pb (II) in water and has better anti-interference capability on pH. Experiments prove that: the optimal removal rate of the material to As (III) in 24 hours reaches more than 96 percent, and the removal rate to Pb (II) reaches more than 93 percent; and in the pH range of 3-6, the removal rate of the As (III) Pb (II) by the iron-sulfur co-doped biochar is kept above 90%.
Drawings
FIG. 1 is an XPS picture of the material of example 1
FIG. 2 is a graph showing the influence of different initial pH values on the adsorption effects of As (III) and Pb (II) in example 2.
Detailed Description
The following examples are presented to further illustrate the present invention and are not to be construed as limiting the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Example 1
Preparing iron and sulfur co-doped biochar: taking 10g of rice straw powder, adding the rice straw powder into 100mL of the rice straw powder containing the components in a molar ratio of 1: 1, magnetically stirring for 10 hours, and then freeze-drying. And putting the dried solid in a nitrogen atmosphere, pyrolyzing the solid for 2h at 300 ℃ at the heating rate of 5 ℃/min, cooling the solid, and washing the solid with deionized water for three times to obtain the iron-sulfur co-doped biochar (Fe/S-BC). Comparison was performed with unmodified biochar.
Preparation of unmodified biochar: putting the rice straw powder in a nitrogen atmosphere, pyrolyzing the powder for 2h at 300 ℃ at the heating rate of 5 ℃/min, cooling the pyrolysis product, and washing the cooled pyrolysis product with deionized water for three times to obtain the unmodified Biochar (BC).
The BET test results are shown in table 1, and the XPS results are shown in fig. 1.
TABLE 1 BET test results of iron and sulfur co-doped biochar and unmodified biochar
| Absorbent | Specific surface area (m)2/g) | Pore volume (cm)2/g) | Pore size (nm) |
| BC | 20.18 | 0.013 | 21.31 |
| Fe/S-BC | 121.90 | 0.058 | 17.85 |
As can be seen from table 1 and fig. 1, the iron-sulfur co-doped biochar has a large specific surface area and pore volume by supporting iron and sulfur, and the removal of As and Pb can be further promoted by the iron-sulfur compound supported on the biochar.
Arsenic and lead removal experiment:
1. comparison of removal rates of different iron and sulfur co-doped biochar dosages
The prepared iron-sulfur co-doped biochar is applied to a composite solution of As (III) and Pb (II) with the initial concentration of 50mg/L, the initial pH value of the solution is adjusted to be 5, the iron-sulfur co-doped biochar is added according to the concentration of 1g/L, 2g/L and 3g/L, the solution is horizontally oscillated for 24 hours in a constant temperature water bath oscillator at the temperature of 25 ℃, the concentration of arsenic and lead in the treated solution is measured according to the method in the documents GB 7475-87, HJ 694-2014 and the like, the result is recorded, and the removal rate is calculated. The results are shown in Table 2 below,
TABLE 2 influence of different concentrations on As (III) and Pb (II) removal rate of composite solution
| Adding amount of charcoal (g/L) | As (III) content (ppm) after treatment | As (III) removal Rate (%) | Pb (II) content (ppm) after treatment | Pb (II) removal Rate (%) |
| 1 | 2.145 | 95.71 | 3.265 | 93.47 |
| 2 | 1.610 | 96.78 | 0.730 | 98.54 |
| 3 | 0.810 | 98.38 | 0.655 | 98.69 |
The results show that: the removal rate of the prepared biochar material on As (III) and Pb (II) is kept above 90%, and the removal rate is increased along with the increase of the adding amount. However, the added iron and sulfur co-doped biochar with 1g/L has reached higher arsenic and lead removal rates which respectively reach 95.71% and 93.47.
2. Comparison of removal rates at different initial pH conditions
Meanwhile, the same operation is carried out As above, but the initial pH of the composite solution of As (III) and Pb (II) is adjusted to 3, 4, 5 and 6 respectively, and then the adsorption experiment is carried out by adding the iron-sulfur co-doped biochar according to 1 g/L. After the experiment, the results were measured. The results are shown in FIG. 1.
It can be seen that the removal rates of As and Pb of the prepared iron-sulfur co-doped biochar for As (III) and Pb (II) reach over 90% under different pH values, which indicates that the iron-sulfur co-doped biochar has better anti-interference capability and adaptive range for the pH value.
Example 2
Preparing iron and sulfur co-doped biochar:
reference is made to example 1 with the following differences: the solid-liquid ratio of the rice straw powder to the suspension is 7g:100mL, the protective atmosphere is argon, and the heating speed is 10 ℃/min.
Arsenic and lead removal experiment: the procedure of example 1 was followed, wherein the iron-sulfur-codoped biochar was 1g/L, and the pH of the composite solution of As (III) and Pb (II) was 5. After the experiment, the percentage of arsenic and lead removal was determined. The results show that: the removal rate of As (III) at the reaction equilibrium was 93.66%, the removal rate of Pb (II) was 91.93%,
example 3
Preparing iron and sulfur co-doped biochar: reference is made to example 1 with the following differences: the molar ratio of ferrous sulfate to sodium thiosulfate in the suspension is 2: 1, the pyrolysis time was 3h, as in example 1.
Arsenic and lead removal experiment: the procedure of example 1 was followed, wherein the iron-sulfur-codoped biochar was 1g/L, and the pH of the composite solution of As (III) and Pb (II) was 5. After the experiment, the percentage of arsenic and lead removal was determined. The results show that: the As (III) removal rate at the reaction equilibrium was 94.21%, and the Pb (II) removal rate was 95.68%.
Example 4
Preparing iron and sulfur co-doped biochar: reference is made to example 1 with the following differences: the pyrolysis temperature was 350 ℃ and the pyrolysis time was 3h, as in example 1.
Arsenic and lead removal experiment: the procedure of example 1 was followed, wherein the iron-sulfur-codoped biochar was 1g/L, and the pH of the composite solution of As (III) and Pb (II) was 5. After the experiment, the percentage of arsenic and lead removal was determined. The results show that: the As (III) removal rate at the reaction equilibrium was 96.95%, and the Pb (II) removal rate was 91.27%.
Based on the above embodiment, the iron-sulfur co-doped biochar can simultaneously and efficiently remove arsenic and lead in a water body, wherein the iron-sulfur co-doped biochar material is added into an arsenic-lead composite solution according to 1g/L to achieve a high removal rate. The initial pH value of the arsenic-lead composite solution is 3-6, the pH value of the solution is adjusted, and the removal rate of the prepared iron-sulfur co-doped biochar on As (III) and Pb (II) is kept above 90%. The solid-liquid ratio of the straw powder to the suspension is 5-15 g:100mL, and the removal rate of As (III) and Pb (II) of the iron-sulfur co-doped biochar prepared by adjusting the using amount of the rice straw powder and the suspension is kept above 90%. The molar ratio of ferrous sulfate to sodium thiosulfate in the suspension is 0.5-2.5: 1, the removal rate of As (III) and Pb (II) of the prepared iron-sulfur co-doped biochar on the As (III) and Pb (II) is kept above 90 percent by adjusting the using amounts of ferrous sulfate and sodium thiosulfate.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations and simplifications are intended to be included in the scope of the present invention.
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| CN115430401A (en) * | 2022-09-23 | 2022-12-06 | 中山大学 | Sulfur-doped biochar with carbon fixation and pollution reduction functions as well as preparation method and application thereof |
| CN116618065A (en) * | 2023-07-26 | 2023-08-22 | 河北工业大学 | Preparation method and application of biochar composite material for in-situ remediation of organic contaminated sites |
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