Red mud adsorbent for removing organic dye pollutants, and preparation method of adsorbent

Abstract

The invention discloses a red mud adsorbent for removing organic dye pollutants, and a preparation method of the adsorbent. The preparation method comprises the steps: taking red mud and water, and stirring to form a red mud water solution; adding hydrochloric acid into the red mud water solution to obtain a red mud turbid solution; then taking polystyrene microspheres and an ethanol water solution at the mass ratio of 1:25, and evenly mixing under the magnetic stirring, to form a polystyrene microspheres-ethanol water solution; taking the red mud dirty solution and the polystyrene microspheres-ethanol water solution at the volume ratio of 1:2, and performing magnetic stirring to obtain a mixed solution I; and aging for 0.5-1hour, and performing suction filtration on the aged mixture; filtering, washing, drying and grinding a solid product after the suction filtration is carried out, thus obtaining the red mud adsorbent. The preparation method is simple to operate, low in cost, and capable of solving the red mud pollution problem; the prepared red mud adsorbent is a graded porous material, has a spherical large hole and wormhole-shaped mesoporous structure, the aperture of each large hole is 350nm, the average aperture of each mesopore is 4nm, the specific surface area is 232m<2>/g, and the red mud adsorbent has higher organic dye pollutant adsorption property.

Description

technical field [0001] The invention relates to an adsorbent, in particular to a red mud adsorbent for removing organic dye pollutants and a preparation method thereof. Background technique [0002] Red mud is the solid waste discharged during the alumina production process. It is highly alkaline and radioactive. It is called red mud because it contains a large amount of iron oxide and turns red. It is a polluting waste. As the world's fourth largest producer of alumina, China discharges millions of tons of red mud every year. Due to the difference in ore grade, production method and technical level, about 0.3-2.5t of red mud is discharged for every ton of alumina produced. At present, the comprehensive utilization rate of red mud in my country is only 4%, and the accumulated stockpile has reached hundreds of millions of tons. With the increase of alumina production in my country and the gradual decrease of bauxite grade, the annual output of red mud will continue to incre...

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Problems solved by technology

Most alumina factories in my country use open-air dams to stockpile red mud. This disposal method not only takes up a lot of land and wastes resources, but also the alkali in the red mud will seep into the ground, causing groundwater and soil pollution; the formation of exposed red mud The dust drifting with the wind will also pollute the atmosphere, negatively affect the survival of humans, animals and plants, and deteriorate the ecological environment

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