A preparation method of iron manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water

A technology of iron-manganese oxide and composite materials, which is applied in the field of functional materials for environmental pollutants, can solve problems such as easy aggregation, lower specific surface area, and influence on arsenic adsorption capacity, and achieve easy recycling, low cost, and reduced aggregation Effect

Active Publication Date: 2022-07-08
INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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  • Description
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Problems solved by technology

However, iron-manganese oxide particles tend to aggregate during the preparation process, resulting in a decrease in the specific surface area, thereby affecting its adsorption capacity for arsenic

Method used

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  • A preparation method of iron manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water
  • A preparation method of iron manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water
  • A preparation method of iron manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of iron-manganese oxide / starch / biochar composite material includes the following steps:

[0030] (1) Air-dry the corn stalks, crush them with a pulverizer, calcine them in a tube furnace at 500 °C under nitrogen protection for 1.5 h, and set the heating program to 5 °C / min, and then grind them through a 0.15 mm sieve to prepare corn stalk biomaterials. Carbon (specific surface area of ​​137.8m 2 ·g -1 )spare.

[0031] (2) Weigh 0.187g corn starch and 0.933g corn stalk biochar into 10mL deionized water and mix thoroughly to prepare a mixed stabilizer solution of corn starch and biochar; weigh 5.57g FeSO 4 ·7H 2 O and 0.302g MnSO 4 , dissolved in 30 mL of deionized water to prepare FeSO 4 and MnSO 4 Mixed solution; weigh 1.264g KMnO 4 , dissolved in 25 mL of deionized water to prepare KMnO 4 solution;

[0032] (3) Add 10 mL of corn starch and biochar mixed stabilizer solution to 30 mL of FeSO 4 and MnSO 4 In the mixed solution, stir magnetically...

Embodiment 2

[0035]1. Referring to the preparation steps of Example 1, the amount of corn stalk biochar is set to 0, and the amount of corn starch is set to 0.14g, 0.187g, 0.35g, 0.933g, 2.8g, respectively, and then prepare iron and manganese oxidation The prepared iron-manganese oxide / starch composite material has a mass ratio of iron-manganese oxide and starch of 20:1, 15:1, 8:1, 3:1 and 1:1. Taking iron manganese oxide / starch composite material (iron manganese oxide: starch mass ratio=20:1) as an example, the specific preparation steps are:

[0036] (1) Weigh 0.14g of cornstarch and add it to 10mL of deionized water and mix thoroughly to prepare a cornstarch solution; weigh 5.57g of FeSO 4 ·7H 2 O and 0.302g MnSO 4 , dissolved in 30 mL of deionized water to prepare FeSO 4 and MnSO 4 Mixed solution; weigh 1.264g KMnO 4 , dissolved in 25 mL of deionized water to prepare KMnO 4 solution;

[0037] (2) Add 10 mL of cornstarch solution to 30 mL of FeSO 4 and MnSO 4 In the mixed solut...

Embodiment 3

[0047] The purpose of this example is to study the adsorption mechanism of iron-manganese oxide / starch / biochar composites to As(III), As(V) and ROX, and the specific steps are as follows:

[0048] Take the iron-manganese oxide / starch / biochar composite material (the mass ratio of iron-manganese oxide: starch: biochar is 15:1:5) prepared in the above example to As(III), As(V) and ROX adsorption. Prepare 100 ppm As(III), As(V) and ROX solutions respectively, adjust the pH to 5.5 with NaOH or HCl, and put 0.15 g of iron-manganese oxide / starch / biochar composite into 500 mL of 100 ppm As(III), respectively , As(V) and ROX solution, continuously stirred with a magnetic stirrer (750 rpm) for 24 h, filtered with suction, frozen and then lyophilized.

[0049] For starch (Starch), biochar (BC), iron manganese oxide (FeMnO) X ), and FeMnO / starch / biochar composites (FeMnO) before and after adsorption X -starch-BC) for infrared spectroscopic analysis, the results are as follows Figure ...

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Abstract

The invention discloses a preparation method of an iron-manganese oxide / starch / biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in a water body. Including the following steps: adding cornstarch and biochar to FeSO 4 and MnSO 4 solution, add KMnO under magnetic stirring 4 The solution was adjusted to pH 2.0 with NaOH, aged, filtered and dried to obtain the iron manganese oxide / starch / biochar composite. The addition of starch and biochar makes the synthesized iron-manganese oxide particles evenly dispersed and uniform in particle size, with a particle size range of 300nm-600nm, thereby significantly increasing the adsorption capacity of the composite material for trivalent arsenic, pentavalent arsenic and roxarsone . The surface active adsorption site of the material is Fe-OH group, which can form inner spherical Fe-O-As complex with arsenic compound. The preparation process of the invention is simple, the cost is low, the raw materials used are low-carbon and environmentally friendly, and various forms of arsenic in the water body can be adsorbed simultaneously.

Description

technical field [0001] The invention relates to the technical field of functional materials for environmental pollutants, in particular to a preparation method of an iron-manganese oxide / starch / biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water. Background technique [0002] Arsenic pollution in the environment is a widespread phenomenon, which is related to the mining and smelting of arsenic-containing metals and the widespread use of arsenic-containing compounds. Arsenic is a class I carcinogen identified by the International Agency for Research on Cancer (IARC). High concentrations of arsenic pollution in the environment will pose a serious threat to human health and the ecological environment. Industrial wastewater mainly includes inorganic arsenic compounds such as trivalent arsenic (As(III)) and pentavalent arsenic (As(V)). Livestock wastewater often contains organic arsenic compounds such as feed additives such as ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/20B01J20/06B01J20/24C02F1/281C02F1/286C02F1/283C02F2101/103C02F2101/20C02F2101/30
Inventor 赵艳萍荀合梁维新郭鹏然安娅丽
Owner INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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