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Preparation method of ferro-manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water body

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

Active Publication Date: 2020-11-03
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of ferro-manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water body
  • Preparation method of ferro-manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water body
  • Preparation method of ferro-manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0032] (3) Add 10 mL of cornstarch and biochar mixed stabilizer solution to 30 mL of FeSO 4 and MnSO 4 In the mixed solution, 300rpm magnetic st...

Embodiment 2

[0035]1. With reference 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 the iron and manganese oxidation The iron-manganese oxide / starch composite material, the mass ratio of iron-manganese oxide and starch in the prepared iron-manganese oxide / starch composite material is 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 cornstarch and add it into 10mL deionized water and mix thoroughly to prepare a cornstarch solution; weigh 5.57g FeSO 4 ·7H 2 O and 0.302g MnSO 4 , dissolved in 30 mL deionized water, prepared as FeSO 4 and MnSO 4 Mixed solution; weigh 1.264g KMnO 4 , dissolved in 25 mL deionized water, prepared as KMnO 4 solution;

[0037] (2) Add 10 mL of cornstarch solution to 30 m...

Embodiment 3

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

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

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

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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. The preparation method comprises the following steps: adding corn starch and biochar into FeSO4 and MnSO4 solutions, adding a KMnO4 solution under magnetic stirring, adjusting the pH value to 2.0 with NaOH, aging the solution, and filtering and drying the solution to obtain the ferro-manganese oxide / starch / biochar composite material. Due to the addition of the starch and the biochar, the synthesized ferro-manganese oxide particles are uniformly dispersed and uniform in particle size, and the particle size range is 300nm-600nm, so that the adsorption capacity of the composite material on trivalent arsenic, pentavalent arsenic and roxarsone is remarkably increased. The surface active adsorption site of the material is a FeOH group, and the Fe-OH group and an arsenic compound can form an inner sphere Fe-O-As compound. The preparation process is simple, the cost is low, the used raw materials are low-carbon and environment-friendly, and various forms of arsenic in the water body can be adsorbed at the same time.

Description

technical field [0001] The invention relates to the technical field of functional materials for environmental pollutants, in particular to a method for preparing an iron-manganese oxide / starch / bio-char composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in water bodies. 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 feed additives such as roxarsone (ROX) and other org...

Claims

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Application Information

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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 INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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