Arsenic pollution remediation material and its application

Abstract

The present invention relates to the technical field of arsenic pollution remediation, and discloses an arsenic pollution remediation material and its application. An arsenic pollution remediation material comprises green rust and calcium peroxide. The arsenic pollution remediation material comprising green rust and calcium peroxide provided by the present invention, calcium peroxide can gradually release oxygen and hydrogen peroxide in water, a large amount of active ferrous iron contained in the green rust can catalyze oxygen and hydrogen peroxide to produce a large amount of active oxygen, thereby oxidizing trivalent arsenic, and the secondary iron minerals produced after the oxidation of ferrous iron can efficiently adsorb and fix arsenic, and when green rust and calcium peroxide are used in combination at a molar ratio of 1: (0.2-1), efficient oxidation and fixation of trivalent arsenic can be achieved. The arsenic pollution remediation material can be applied to the oxidation and fixation of trivalent arsenic in water and soil, and promote the remediation of arsenic-contaminated water and soil.

Description

Technical Field

[0001] The present invention relates to the technical field of arsenic pollution remediation, and in particular to an arsenic pollution remediation material and application thereof. Background Art

[0002] Arsenic (As) is a toxic, carcinogenic metalloid element. High-intensity human activities have caused a large amount of arsenic to be discharged into the groundwater and soil environment, especially near mines and industrial areas. The arsenic concentration in groundwater and soil far exceeds the risk screening threshold. Arsenic usually exists in the underground environment in the form of arsenite [As(III)] and arsenate [As(V)]. The mobility and toxicity of As(III) are much higher than As(V), making it more difficult to adsorb and fix through electrostatic binding, surface complexation or co-precipitation, which further increases the difficulty of arsenic pollution remediation. Therefore, how to efficiently oxidize As(III) has become an urgent problem to be solved in the remediation of arsenic pollution in water and soil.

[0003] At present, there are many remediation technologies for arsenic pollution in water and soil, among which adsorption fixation technology has attracted widespread attention due to its advantages such as easy operation and low cost. Studies have found that iron (hydroxide) oxides have a high affinity for arsenic, especially for oxygen-containing anions As(V). Many studies are devoted to the development of iron oxide materials for arsenic fixation, such as iron salts, ferrihydrite, hematite, magnetite, lepidocrocite and various iron-based materials. However, most iron oxides lack active Fe(II), so it is difficult to produce a large amount of active oxygen under aerobic conditions to oxidize As(III) to As(V), resulting in unsatisfactory arsenic fixation.

[0004] In order to improve the oxidation and fixation of arsenic by iron oxides, some studies have introduced hydrogen peroxide (H2O2), which generates a variety of reactive oxygen species such as hydroxyl radicals, superoxide radicals, and singlet oxygen through a Fenton-like reaction between H2O2 and iron oxides to enhance the oxidation of arsenic. However, H2O2 is prone to disproportionation and decomposition, resulting in reduced utilization efficiency. At the same time, the Fenton-like reaction based on H2O2 requires high pH conditions (pH value is 2.0-3.0). In practical applications, it is difficult to strictly control the pH value to meet the optimal reaction conditions, and it will greatly increase the remediation cost. These defects make it difficult to achieve large-scale application of H2O2 composite iron oxide technology in the remediation of arsenic pollution in water or soil. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, one of the purposes of the present invention is to provide an arsenic pollution remediation material; the second purpose of the present invention is to provide the application of the arsenic pollution remediation material.

[0006] The basic principle of the present invention is described as follows:

[0007] The present invention provides an arsenic pollution repair material (green rust composite calcium peroxide) comprising green rust and calcium peroxide. The green rust contains a large amount of active ferrous iron. The calcium peroxide can gradually release oxygen and hydrogen peroxide in water (Formula [I]-[II]). The active ferrous iron in the green rust can catalyze oxygen and hydrogen peroxide to produce a large amount of active oxygen (Formula [III]-[V]), thereby quickly oxidizing trivalent arsenic to pentavalent arsenic. At the same time, the secondary iron minerals produced after the oxidation of ferrous iron can efficiently adsorb and fix arsenic, and finally achieve the purpose of efficiently oxidizing and fixing trivalent arsenic. The relevant reaction equation is as follows:

[0008] CaO2 + H2O → Ca(OH)2 + O2 (Ⅰ);

[0009] CaO2 + 2H2O → Ca(OH)2 + H2O2 (II);

[0010] Fe(II) + O2 → Fe(III) + ·O2 - (III);

[0011] O2 - + 2H2O → H2O2 + 2OH - + 1 O2 (IV);

[0012] Fe(II)+H2O2→Fe(III)+·OH+OH - (V).

[0013] In order to achieve the above object, the technical solution adopted by the present invention is:

[0014] A first aspect of the present invention provides an arsenic pollution remediation material, comprising green rust and calcium peroxide (GR / CaO2).

[0015] Preferably, the molar ratio of green rust (GR) to calcium peroxide (CaO2) is 1:(0.2-1); further preferably, the molar ratio of green rust to calcium peroxide is 1:(0.4-0.6).

[0016] Preferably, the green rust contains Fe(II) and Fe(III).

[0017] Preferably, in the green rust, the molar ratio of Fe(II) to Fe(III) is (1.5-10):1; further preferably, the molar ratio of Fe(II) to Fe(III) is (5-10):1.

[0018] Preferably, the green rust is prepared by a method comprising the following steps:

[0019] Mix NaOH and FeCl2·4H2O to obtain Fe(OH)2 suspension, oxidize and deoxygenate to obtain.

[0020] Preferably, the molar ratio of NaOH to FeCl2·4H2O is (1-2):1.

[0021] Preferably, the specific method of oxidation includes stirring the Fe(OH)2 suspension in air.

[0022] Preferably, the stirring time is 2 to 60 min; more preferably, the stirring time is 10 to 30 min.

[0023] Preferably, the stirring speed is 300-500 rpm; further preferably, the stirring speed is 350-450 rpm.

[0024] The second aspect of the present invention provides the use of the arsenic pollution remediation material described in the first aspect of the present invention in the remediation of arsenic-contaminated water or arsenic-contaminated soil.

[0025] Preferably, the remediation of arsenic-contaminated water or arsenic-contaminated soil is the oxidation and fixation of As(III).

[0026] Preferably, the remediation of arsenic-contaminated water / soil specifically comprises the following steps: adding green rust and calcium peroxide to the arsenic-contaminated water / soil respectively to oxidize and fix As(III) in the water / soil.

[0027] Preferably, the water quality parameters of the arsenic-contaminated water body include at least one of the following: the As(III) content is 0.05-70 mg / L; the pH value of the water body is 5-9; further preferably, the As(III) content is 50-70 mg / L; the pH value of the water body is 6-8.

[0028] Preferably, the solid-liquid ratio of the arsenic pollution remediation material to the arsenic polluted water body is (110-240) mg:1L; further preferably, the solid-liquid ratio of the arsenic pollution remediation material to the arsenic polluted water body is (150-170) mg:1L.

[0029] Preferably, in the remediation of arsenic-contaminated water, the dosage of the green rust is 70-90 mg / L (in terms of Fe concentration); further preferably, the dosage of the green rust is 75-85 mg / L (in terms of Fe concentration).

[0030] Preferably, in the remediation of arsenic-contaminated water, the dosage of calcium peroxide is 32.5 to 160 mg / L; further preferably, the dosage of calcium peroxide is 75 to 85 mg / L.

[0031] Preferably, the total arsenic content in the arsenic-contaminated soil is 15 to 500 mg / kg; further preferably, the total arsenic content in the arsenic-contaminated soil is 400 to 500 mg / kg.

[0032] Preferably, the mass ratio of the arsenic contaminated remediation material to the arsenic contaminated soil is (0.5-3):100; further preferably, the mass ratio of the arsenic contaminated remediation material to the arsenic contaminated soil is (1-2):100.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1) The arsenic pollution remediation material provided by the present invention includes green rust and calcium peroxide. Calcium peroxide can gradually release oxygen and hydrogen peroxide in water. Green rust contains a large amount of active ferrous iron and can catalyze oxygen and hydrogen peroxide to produce a large amount of active oxygen, thereby oxidizing trivalent arsenic. The secondary iron minerals produced after the oxidation of ferrous iron can efficiently adsorb and fix arsenic. When green rust and calcium peroxide are used in combination in a specific ratio (molar ratio of 1: (0.2-1)), efficient oxidation and fixation of trivalent arsenic can be achieved.

[0035] 2) The arsenic pollution remediation material provided by the present invention can adapt to the reaction system with a pH value of 5 to 9, overcoming the defects of the traditional H2O2 composite iron oxide technology that has high requirements for pH conditions, is prone to disproportionation / decomposition reactions, and is difficult to apply on a large scale.

[0036] 3) The arsenic pollution remediation material provided by the present invention has simple preparation and use methods, is environmentally friendly and pollution-free, has low cost, and is suitable for practical use.

[0037] 4) The arsenic pollution remediation material provided by the present invention can achieve an oxidation rate of As(III) in the solution of more than 90%, and a fixation rate of more than 70%, and Ca 2+ Mg 2+ Both arsenic acid and humic acid will not inhibit the oxidation of As(III), have good anti-interference ability, and are suitable for the remediation of arsenic-contaminated water bodies.

[0038] 5) Compared with the commercial materials ferrous chloride and ferric chloride, the arsenic pollution remediation material provided by the present invention can reduce the concentration of arsenic extracted from soil by 86% and 96% respectively after treatment. It can quickly and efficiently passivate soil arsenic, effectively reduce the risk of soil arsenic leaching, and promote efficient remediation of soil arsenic pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The XRD pattern of the green rust in Example 1 matched with the standard card;

[0040] Figure 2The fixation (A) and oxidation (B) kinetics of trivalent arsenic by GR, GR / CaO2 and CaO2 in Example 2;

[0041] Figure 3 The fixation (A) and oxidation (B) kinetics of trivalent arsenic corresponding to different CaO2 dosages in Example 3;

[0042] Figure 4 The fixation (A) and oxidation (B) effects of GR / CaO2 on trivalent arsenic in the presence of different anions and humic acid in Example 4;

[0043] Figure 5 is the TCLP-extractable arsenic concentration of soil under GR / CaO2, FeCl2 and FeCl3 treatments in Example 5;

[0044] Figure 6 This is the dynamic change of TCLP-extractable arsenic concentration in soil under GR / CaO2 treatment within 30 days in Example 6. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below by specific examples. The raw materials, reagents or devices used in the examples can be obtained from conventional commercial sources or by prior art methods unless otherwise specified. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0046] Example 1

[0047] GR / CaO2 arsenic pollution remediation materials:

[0048] 1) Green rust: Add 5.69 g FeCl2·4H2O to 50 mL 1 mol / L NaOH solution, then quickly add 150 mL deionized water, and stir the mixed suspension in air at 400 rpm for 10 min. Transfer the mixture to an anaerobic glove box and stir for 1 h to eliminate excess oxygen to obtain green rust, which contains Fe(II) and Fe(III), and the molar ratio of Fe(II) to Fe(III) is 10:1.

[0049] 2) Calcium peroxide: industrial grade commercial calcium peroxide solid powder.

[0050] 3) GR / CaO2 arsenic pollution remediation material: including green rust and calcium peroxide, the molar ratio of green rust to calcium peroxide is 1:

[0051] (0.2~1).

[0052] Example 2

[0053] Oxidation and fixation efficiency of trivalent arsenic by GR / CaO2:

[0054] 1) Prepare a 300 mg / L trivalent arsenic solution, the solvent is ultrapure water, and the pH is adjusted to 7; prepare 100 mmol / L piperazine-1,4-diethanesulfonic acid buffer (PIPES buffer), and the pH is adjusted to 7.

[0055] 2) The green rust and calcium peroxide in Example 1 were used for the experiment. The reaction system was 40 mL, and the reaction pH was controlled at 7 with 20 mmol / L PIPES, wherein the initial concentration of As(III) was 60 mg / L, the amount of green rust added in the GR / CaO2 system was 80 mg / L (based on Fe concentration), and the amount of calcium peroxide added was 3.2 mg (the molar ratio of green rust to calcium peroxide was 1:0.5). A system in which green rust (GR) and calcium peroxide (CaO2) were added separately was set up for comparison, and the solutions were all placed in a 50 mL open conical flask for reaction.

[0056] 3) Start timing after adding materials, place the conical flask on a magnetic stirrer and react at 400 rpm for 1 hour at a temperature of 25°C, and take samples at time points during the reaction.

[0057] 4) Each time, an equal amount of the mixed solution in the system was taken to pass through a 0.22 μm water membrane, and the concentrations of trivalent arsenic and pentavalent arsenic in the filtrate were determined, and finally the results of arsenic oxidation kinetics and arsenic fixation kinetics were obtained.

[0058] Example 3

[0059] Effect of calcium peroxide dosage:

[0060] 1) Prepare a 300 mg / L trivalent arsenic solution, the solvent is ultrapure water, and the pH is 7; prepare a 100 mmol / L PIPES buffer, and the pH is 7.

[0061] 2) The green rust and calcium peroxide in Example 1 were used for the experiment. The reaction system was 40 mL, and the reaction pH was controlled at 7 with 20 mmol / L PIPES, wherein the initial concentration of As(III) was 60 mg / L, the amount of green rust added was 80 mg / L (based on Fe concentration), and the amounts of calcium peroxide added were 1.3 mg, 3.2 mg, and 6.4 mg, respectively (the molar ratio of green rust to calcium peroxide was 1:0.2, 1:0.5, and 1:1, respectively), and the solutions were placed in 50 mL open conical flasks for reaction.

[0062] 3) Start timing after adding materials, place the conical flask on a magnetic stirrer and react at 400 rpm for 1 hour at a temperature of 25°C, and take samples at time points during the reaction.

[0063] 4) Each time, an equal amount of the mixed solution in the system was taken to pass through a 0.22 μm water membrane, and the concentrations of trivalent arsenic and pentavalent arsenic in the filtrate were measured to evaluate the effect of the calcium peroxide dosage.

[0064] Example 4

[0065] Evaluation of anti-interference ability in GR / CaO2 applications:

[0066] 1) Prepare a 300 mg / L trivalent arsenic solution, the solvent is ultrapure water, and the pH is 7; prepare a 100 mmol / L PIPES buffer, and the pH is 7.

[0067] 2) Configure the representatives separately Ca 2+ Mg 2+ Sodium and chloride salt solutions of anions and cations and humic acid (HA), all at a concentration of 1000 mg / L.

[0068] 3) The green rust and calcium peroxide in Example 1 were used for the experiment. The reaction system was 40 mL, and the reaction pH was controlled at 7 with 20 mmol / L PIPES, wherein the initial concentration of As(III) was 60 mg / L, the amount of green rust added was 80 mg / L (based on Fe concentration), and the amount of calcium peroxide added was 3.2 mg (the molar ratio of green rust to calcium peroxide was 1:0.5). An experimental group and a control group were set, and the concentrations of anions and cations and humic acid in the experimental group included 100 mg / L and 200 mg / L, and no anions and cations and humic acid were added to the control group, and the solution was placed in a 50 mL open conical flask for reaction.

[0069] 4) Start timing after adding materials, place the conical flask on a magnetic stirrer and react at 400 rpm for 1 hour at a temperature of 25°C, and take samples at time points during the reaction.

[0070] 5) Each time, an equal amount of the mixed solution in the system was taken to pass through a 0.22 μm water membrane, and the concentrations of trivalent arsenic and pentavalent arsenic in the filtrate were measured to evaluate the anti-interference ability of arsenic fixation by GR / CaO2 oxidation.

[0071] Example 5

[0072] Application and comparative analysis of GR / CaO2 soil arsenic passivation:

[0073] 1) Arsenic-contaminated soil collected from an arsenic-contaminated site was air-dried and ground through a 100-mesh sieve, wherein the soil arsenic concentration was 488.6 mg / kg. A 300 mg / L trivalent arsenic solution (as exogenous arsenic contamination) was prepared, and the pH was adjusted to 7. The soil arsenic extractant was 17.25 mL of glacial acetic acid diluted to 1 L of water to obtain a soil TCLP extractant (ToxicityCharacteristic Leaching Procedure, TCLP) with a pH of 2.64±0.05.

[0074] 2) The green rust and calcium peroxide in Example 1 were used for the experiment. 2 g of soil was accurately weighed and placed in a 50 mL centrifuge tube, and 20 mL of 60 mg / L As (III) solution was added. Then, 2% green rust composite calcium peroxide material was added according to the soil mass ratio, wherein the molar ratio of green rust to calcium peroxide was 1:0.5. Commercial ferrous chloride (FeCl2) and ferric chloride (FeCl3) were selected for comparison, and the addition amount was the same as 2%. No repair material was added to the control group.

[0075] 3) Start timing after adding materials, place in a shaker at 200 rpm, and react at 25°C for 1 day.

[0076] 4) After the reaction is completed, the centrifuge tube is centrifuged at 7000 rpm for 5 min, and the supernatant is passed through a 0.22 μm water membrane for arsenic concentration analysis.

[0077] 5) At the same time, the remaining soil was added with TCLP extractant at a solid-liquid ratio of 1kg:20L and placed in a shaker at 200rpm for 18h.

[0078] 6) After the reaction is completed, the centrifuge tube is centrifuged at 7000 rpm for 5 min, and the supernatant is passed through a 0.22 μm water membrane for arsenic concentration analysis.

[0079] Example 6

[0080] Long-term evaluation of GR / CaO2 soil arsenic passivation application:

[0081] 1) Arsenic-contaminated soil collected from an arsenic-contaminated site was air-dried and ground through a 100-mesh sieve, wherein the soil arsenic concentration was 488.6 mg / kg. A 300 mg / L trivalent arsenic solution (as exogenous arsenic contamination) was prepared, and the pH was adjusted to 7. The soil arsenic extractant was 17.25 mL of glacial acetic acid diluted to 1 L of water to obtain a soil TCLP extractant (ToxicityCharacteristic Leaching Procedure, TCLP) with a pH of 2.64±0.05.

[0082] 2) The green rust and calcium peroxide in Example 1 were used for the experiment. 2 g of soil was accurately weighed and placed in a 50 mL centrifuge tube, and 20 mL of 60 mg / L As(III) solution was added. Then, 2% green rust composite calcium peroxide material was added according to the mass ratio of the soil, wherein the molar ratio of green rust to calcium peroxide was 1:0.5. The control group was not added with repair materials, and the reaction was continued for 30 days.

[0083] 3) After the reaction was completed, the centrifuge tube was centrifuged at 7000 rpm for 5 min, and the supernatant was passed through a 0.22 μm water membrane for arsenic concentration analysis.

[0084] 4) At the same time, the remaining soil was added with TCLP extractant at a solid-liquid ratio of 1kg:20L and placed in a shaker at 200rpm for 18h.

[0085] 5) After the reaction is completed, the centrifuge tube is centrifuged at 7000 rpm for 5 min, and the supernatant is passed through a 0.22 μm water membrane for arsenic concentration analysis.

[0086] Figure 1 The XRD pattern of the green rust in Example 1 matched with the standard card is shown in FIG. Figure 1 It can be seen that the characteristic peaks of the green rust prepared in Example 1 are basically consistent with the "PDF#40-0127 (GR (Cl))" standard card, indicating that the purity of the green rust is relatively high.

[0087] Figure 2 The fixation (A) and oxidation (B) kinetics of trivalent arsenic by GR, GR / CaO2 and CaO2 in Example 2. Figure 2 In (A), C0 is the initial concentration of As(III) (60 mg / L), C1 is the As(III) concentration at the detection time point, and Figure 2 (A) It can be seen that in the green rust and green rust composite calcium peroxide systems, the content of As(III) decreases with the reaction time, indicating that both green rust and green rust composite calcium peroxide can oxidize and fix As(III), while single calcium peroxide is difficult to achieve oxidation and removal of As(III). The green rust composite calcium peroxide can oxidize As(III) to As(V) and fix it within 60 minutes, with a fixation rate of 70.9%, which is 1.4 times that of green rust alone. Figure 2 (B) It can be seen that in the green rust, calcium peroxide and green rust composite calcium peroxide system, the As(V) content increases with the passage of time, indicating that all three can oxidize As(III) to form As(V), but the oxidation capacity of single green rust and single calcium peroxide is limited. The oxidation rate of green rust composite calcium peroxide on As(III) reaches 90.4%, which is 2.7 times that of green rust alone. This shows that after calcium peroxide and green rust are used in combination, oxygen and hydrogen peroxide will gradually be released in the reaction system, thereby promoting the generation of a variety of active oxygen species, which can oxidize more As(III) to As(V). It can be seen that the green rust composite calcium peroxide arsenic pollution remediation material provided by the present invention has a high oxidation rate and fixation rate for As(III) in the solution, and can be used to oxidize and fix As(III) in water bodies.

[0088] Figure 3 The fixation (A) and oxidation (B) kinetics of trivalent arsenic corresponding to different CaO2 dosages in Example 3. Figure 3 In (A), C0 is the initial concentration of As(III) (60 mg / L), C1 is the As(III) concentration at the detection time point, and Figure 3 (A) It can be seen that with the increase of calcium peroxide dosage, the fixation rate of As(III) shows a trend of increasing first and then decreasing. When the molar ratio of green rust to calcium peroxide is 1:0.2 and 1:0.5, the fixation rate of As(III) is similar at 60 min. However, when the molar ratio of green rust to calcium peroxide is 1:0.5, the fixation effect of As(III) is the best when the time is less than 60 min. Figure 3 (B) It can be seen that with the increase of calcium peroxide dosage, the As(III) oxidation rate shows an increasing trend. When the molar ratio of green rust to calcium peroxide is 1:1, the oxidation rate can reach 100%. It can be seen that in order to achieve the optimal arsenic oxidation and fixation effect, the amount of calcium peroxide added needs to be considered in practical applications.

[0089] Figure 4 The fixation (A) and oxidation (B) effects of GR / CaO2 on trivalent arsenic in the presence of different anions and humic acid in Example 4. Figure 4 (A) It can be seen that except for phosphate, the fixation of As(III) is inhibited, and other anions and cations and humic acid have no significant effect on the fixation of trivalent arsenic by GR / CaO2. Figure 4 (B) It can be seen that Ca 2+ Mg 2+ Neither arsenic nor humic acid will inhibit the oxidation of As(III). It can be seen that the green rust composite calcium peroxide arsenic pollution remediation material provided by the present invention has good anti-interference ability to anions, cations and humic acid, strong environmental adaptability and good practicality.

[0090] Figure 5 is the TCLP-extractable arsenic concentration of soil under GR / CaO2, FeCl2 and FeCl3 treatment in Example 5, Figure 5 It can be seen that the concentration of arsenic in the TCLP-extracted state in the soil under GR / CaO2 treatment decreased by 99% compared with the control treatment, and decreased by 86% and 96% respectively compared with the treatment of commercial ferrous chloride and ferric chloride materials, effectively reducing the risk of soil arsenic leaching. This shows that the green rust composite calcium peroxide arsenic pollution remediation material provided by the present invention can quickly and efficiently passivate soil arsenic and promote soil arsenic pollution remediation.

[0091] Figure 6 The dynamic changes of TCLP-extractable arsenic concentration in soil under GR / CaO2 treatment within 30 days in Example 6 are shown in Table 6. Figure 6 It can be seen that in the reaction of GR / CaO2 treatment for 30 days, the concentration of arsenic extracted by TCLP in the soil was significantly lower than that in the control group, and no release was found. It can be seen that the green rust composite calcium peroxide arsenic pollution remediation material provided by the present invention can fix soil arsenic in a long-term manner with a stable effect.

[0092] The arsenic pollution repair material provided by the present invention includes green rust and calcium peroxide. When the green rust and calcium peroxide are compounded in an appropriate ratio (the molar ratio of green rust to calcium peroxide is 1:0.5), the oxidation rate of As(III) in the solution can reach more than 90%, and the fixation rate can reach more than 70%; the oxidation effect is not affected by Ca 2+ Mg 2+ It is not affected by anions, cations and humic acid, and has good anti-interference ability; it can be used under pH conditions of 5 to 9, and the pH value requirement is not strict, and can be applied to the remediation of arsenic-contaminated water bodies, with good practicability; compared with commercial materials such as ferrous chloride and ferric chloride, it can effectively reduce the risk of soil arsenic leaching, can quickly and efficiently passivate soil arsenic, and the passivation effect is stable, which is conducive to promoting the efficient remediation of soil arsenic pollution.

Claims

1. An arsenic pollution remediation material, characterized in that: It is composed of green rust and calcium peroxide; the molar ratio of the green rust to calcium peroxide is 1:(0.2-1); the green rust contains Fe(II) and Fe(III); the molar ratio of Fe(II) to Fe(III) is (1.5-10):

1.

2. The arsenic pollution remediation material according to claim 1, characterized in that: The green rust is prepared by a method comprising the following steps: Mix NaOH and FeCl2·4H2O to obtain Fe(OH)2 suspension, oxidize and deoxygenate to obtain.

3. The arsenic pollution remediation material according to claim 2, characterized in that: The molar ratio of NaOH to FeCl2·4H2O is (1-2):

1.

4. The arsenic pollution remediation material according to claim 2, characterized in that: The specific method of oxidation includes stirring the Fe(OH)2 suspension in air; And / or, the stirring time is 2 to 60 minutes; And / or, the stirring speed is 300-500 rpm.

5. Use of the arsenic pollution remediation material according to any one of claims 1 to 4 in the remediation of arsenic-contaminated water or arsenic-contaminated soil.

6. The use according to claim 5, characterized in that: The remediation of arsenic-contaminated water or arsenic-contaminated soil is to oxidize and fix As(III).

7. The use according to claim 5, characterized in that: The water quality parameters of the arsenic-contaminated water body include at least one of the following: the content of As(III) is 0.05 to 70 mg / L; the pH value of the water body is 5 to 9; And / or, the solid-to-liquid ratio of the arsenic pollution remediation material to the arsenic polluted water body is (110-240) mg:1L.

8. The use according to claim 5, characterized in that: The total arsenic content in the arsenic-contaminated soil is 15 to 500 mg / kg; And / or, the mass ratio of the arsenic contaminated remediation material to the arsenic contaminated soil is (0.5-3):100.

Images