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Magnesium oxide-metal sulfide-biomass charcoal composite material as well as preparation method and application thereof

A technology of metal sulfide and biochar, applied in chemical instruments and methods, chemical/physical processes, water treatment of special compounds, etc., to achieve low thermal expansion coefficient, rich pore structure, and excellent adsorption effect

Active Publication Date: 2021-09-21
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Description
  • Claims
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Problems solved by technology

[0007] In view of the deficiencies in the prior art, the present invention provides a magnesium oxide-metal sulfide-biomass charcoal composite material and its preparation method and application, so as to solve the problems of the existing crop straw and by-product bischofite in the process of extracting potassium from salt lakes. resource utilization and water pollution control

Method used

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  • Magnesium oxide-metal sulfide-biomass charcoal composite material as well as preparation method and application thereof

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preparation example Construction

[0039] The embodiment of the present invention also provides a preparation method of magnesium oxide-metal sulfide-biomass charcoal composite material as described above, refer to figure 1 , the preparation method comprises:

[0040] Step S10, dissolving the biomass waste, bischofolite, monovalent metal salt and nitrogen source organic matter in a solvent, stirring and mixing, heating to evaporate the solvent, and obtaining a mixed material.

[0041] Preferably, the biomass waste is crop straw, the main component of the crop straw is biomass carbon, which needs to be pulverized first; the bischofolite is a by-product of the potassium extraction process, and the main component is magnesium chloride hexahydrate ; The monovalent metal salt is silver nitrate, silver chloride, silver sulfate, cuprous chloride or cuprous sulfate; the nitrogen source organic matter is melamine, urea or polyvinylpyrrolidone.

[0042] Further preferably, in terms of parts by mass, the mass fraction of...

Embodiment 1

[0065] Step 1, take by weighing 75g of pulverized rice straw, 15g of potassium extract by-product bischolite, 2g of silver nitrate and 8g of melamine are placed in a batching tank filled with 600mL of deionized water, and at room temperature with a rotating speed of 300 r / Min was stirred for 0.5h. The temperature of the mixed suspension in the batching tank was raised to 60° C. and stirred at a constant temperature until the deionized water was completely evaporated to obtain a mixed material.

[0066] Step 2: Add 20g of potassium hydroxide to the mixed material, stir evenly and put it into a high-temperature converter with a rotation speed of 10 r / min, and feed H 2 H with a volume fraction of S of 25% and a gas flow rate of 80 mL / min 2 S / N 2 The air in the furnace was exhausted with the mixed gas, and the temperature was raised to 600°C at a rate of 10°C / min under the atmosphere and roasted at a constant temperature for 3 hours to obtain a roasted product.

[0067] The wa...

Embodiment 2

[0072] Step 1. Weigh 70g of pulverized wheat straw, 13g of potassium-extracting by-product bischolite, 2g of cuprous chloride and 15g of urea into a batching tank filled with 550mL of deionized water, and at room temperature at a speed of Stir at 250 r / min for 0.5h. The temperature of the mixed suspension in the batching tank was raised to 65° C. and stirred at a constant temperature until the deionized water was completely evaporated to obtain a mixed material.

[0073] Step 2: Add 15g of potassium hydroxide to the mixed material, stir evenly and put it into a high-temperature converter with a rotation speed of 10 r / min, and feed H 2 H with a volume fraction of S of 30% and a gas flow rate of 70 mL / min 2 S / N 2 The mixed gas exhausted the air in the furnace, and in this atmosphere, the temperature was raised to 650°C at 15°C / min and roasted at a constant temperature for 2.5h to obtain a roasted product.

[0074] The waste gas generated during the reaction process is absorbe...

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Abstract

The invention provides a magnesium oxide-metal sulfide-biomass charcoal composite material. The magnesium oxide-metal sulfide-biomass charcoal composite material comprises monovalent metal sulfide, magnesium oxide and S and N co-doped amorphous carbon. The preparation method of the composite material comprises the following steps of stirring and dissolving crop straw, bischofite, monovalent metal salt and nitrogen source organic matter in a solvent, and heating to evaporate the solvent to obtain a mixed material, grinding and stirring the mixed material and potassium hydroxide, then putting the mixture into a reaction furnace, carrying out constant-temperature roasting in a mixed gas atmosphere of H2S and N2, and then cooling to room temperature to obtain the composite material. Crop straw and a potassium extraction process byproduct bischofite are adopted as raw materials for preparation, so that resource utilization is realized, and the problems of resource waste and environmental pollution are solved. Besides, the composite material has adsorption-photocatalysis dual functions, can adsorb and photocatalytically degrade pollutant molecules in wastewater, and can be applied to treatment of water pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental materials, and in particular relates to a magnesium oxide-metal sulfide-biomass carbon composite material and a preparation method and application thereof. Background technique [0002] Crop straw is the main by-product of agricultural production, but the current comprehensive utilization technology of straw is still in the state of small scale, poor economy and high cost of resource industry, which has caused a surplus of straw and led to a large amount of straw burning. Since crop straw contains nitrogen, phosphorus, potassium, hydrocarbon elements and organic sulfur, etc., a large amount of nitrogen oxides, sulfur dioxide, hydrocarbons and smoke will be produced after incomplete combustion, and secondary pollutants ozone may also be produced under the action of sunlight etc., and burning straw in the field will destroy the balance of the biological system, change the physical and chemical...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J27/24B01J27/04C02F1/28C02F1/30C02F101/30
CPCB01J20/20B01J20/041B01J20/0285B01J20/3078B01J27/24B01J27/04C02F1/288C02F1/30B01J2220/4825C02F2101/30C02F2305/10B01J35/39
Inventor 文静肖学英常成功董金美郑卫新郑小刚
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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