Preparation of magnesium-aluminum bimetal oxide modified straw biomass charcoal composite material and application of magnesium-aluminum bimetal oxide modified straw biomass charcoal composite material to removal of phosphorus in wastewater

Abstract

The invention belongs to the technical field of composite materials and discloses a preparation of a magnesium-aluminum bimetal oxide modified straw biomass charcoal composite material. The preparation method comprises the following steps of: soaking crushed straws in a sodium hydroxide solution, removing impurities, cleaning the crushed straws with deionized water to obtain yellow filamentous fibers, adding the yellow filamentous fibers into an acetic acid acidified sodium chlorite solution, performing decolorizing, cleaning, and drying to obtain SF; preparing an aluminum nitrate solution, soaking the SF for 4-24 h and then performing filtering, performing high-temperature calcination in a nitrogen atmosphere to obtain Al2O3 / SF; and dissolving magnesium nitrate hexahydrate, Al2O3 / SF and hexamethylenetetramine in deionized water according to a solid-to-liquid ratio of (0.3-3.0) g: (0.2-1.8) g: (0.05-1.3) g: (50-200) mL, reacting at 60-180 DEG C for 6-48 hours, and calcining at high temperature in the nitrogen atmosphere to obtain Mg-Al / SF. According to the method, the waste straws are used as a biomass resource, the Mg-Al / SF is prepared through a simple hydrothermal and calcining method, efficient removal of phosphorus in the wastewater is achieved under the condition that the use amount is very small, the material can be recycled, the preparation cost is reduced to the maximumextent, and the adsorption performance is improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of a modified biomass carbon composite material, in particular to the preparation of a magnesium-aluminum double metal oxide modified rice straw biomass carbon composite material and its application for removing phosphorus in wastewater. Background technique [0002] Water is the most precious resource on earth and one of the indispensable conditions for human existence. However, with the growth of social population and industrial modernization, the water resources that can be used by human beings are becoming less and less. In many countries in the world, industrial wastewater or domestic sewage with high phosphorus content is directly discharged into natural water bodies without treatment or improper treatment, resulting in the destruction of oceans, lakes and other water bodies and frequent eutrophication. In addition, phosphorus in water will r...

AI Technical Summary

Problems solved by technology

However, the cost of physical phosphorus removal is too high and the efficiency is low; the biological method is highly dependent on the environment and does not have good practicability; the chemical method of phosphorus removal is simple and efficient, but requires a large amount of chemical reagents, which may cause cause secondary pollution

The above three methods cannot recycle the fixed phosphorus

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