Magnetic adsorbent and preparation method and application thereof

Abstract

The invention provides a magnetic adsorbent and a preparation method and application thereof in wastewater phosphor removal and dye removal. The preparation method comprises the following steps of (1) uniformly mixing an ilmenite powder and an activated carbon powder, so as to obtain a mixed material, wherein the percentages of ilmenite powder and activated carbon powder respectively account for 75 to 90% and 25 to 10% of the mass of the mixed material; (2) under the nitrogen or argon protection atmosphere, putting the mixed material under the condition of microwave power of 300 to 600W, reacting for 5 to 30min, cooling to room temperature, washing the material by water until the washing liquid is in a neutral state, and drying, so as to obtain the magnetic adsorbent; or, under the nitrogen or argon protection atmosphere, putting the mixed material under the condition of microwave power of 300 to 600W, reacting for 5 to 30min, cooling to room temperature, screening the obtained material, and loading with lanthanum, so as to obtain the magnetic adsorbent. The magnetic adsorbent prepared by the method has the advantages that the ability of removing phosphor and dye is good; the type of the adsorbent is rich, the cost of the adsorbent is reduced, the difficulty in recycling is decreased, and the application field of the ilmenite is widened.

Description

Technical field [0001] The invention belongs to the field of adsorption materials, and particularly relates to a magnetic adsorbent and a preparation method thereof, and the application of the magnetic adsorbent in the removal of phosphorus and dyes from wastewater. Background technique [0002] With the development of social economy and the acceleration of urban construction, the pollution of phosphorus and dyes in water bodies is becoming more and more serious. Excessive phosphorus will cause hypoxia and eutrophication of water bodies, leading to deterioration of water quality and harm to water ecosystems. Dyes mostly contain toxic fused-ring aromatic and heterocyclic compounds. When the dye enters the water body, the dissolved oxygen concentration of the water body will be reduced, which will not only cause harm to the aquatic environment, but also cause tertiary toxicity to the human body. In order to effectively alleviate the damage of phosphorus and dyes to water bodies an...

AI Technical Summary

Problems solved by technology

At present, the commercial adsorbents used to remove phosphorus and dyes from wastewater are mainly activated carbon. The price of this type of adsorbent is relatively high, it is difficult to recover after use, and the regeneration cost after adsorption saturation is also relatively high. These factors limit this. Large-scale industrial application of similar adsorbents and adsorption methods in the field of water treatment

[0004] Ilmenite is a natural oxide mineral resource, which has the advantages of cheap, non-toxic and abundant reserves. At present, ilmenite is mainly used to produce titanium dioxide, and a small amount is used to produce metal titanium, iron in ilmenite and other Metal elements have not been rationally utilized, or even been dumped as waste, which not only wastes resources, but also causes serious pollution to the environment

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