Preparation method and application of bimetallic oxide/carbon composite material

Abstract

The invention relates to a preparation method and application of a bimetallic oxide / carbon composite material, belonging to the technical fields of composite material preparation and water treatment. The preparation method comprises the following steps: dropwise adding mixed salt solution of magnesium nitrate or zinc nitrate and aluminum nitrate and mixed alkaline solution of sodium hydroxide and sodium carbonate into a breaker which is heated at the temperature of 60 DEG C and filled with distilled water, controlling pH value to be about 10, continuously stirring for 6-12 hours, and standing for 3-6 hours, thus obtaining turbid liquid of hydrotalcite; adding congo red wastewater into the turbid liquid of hydrotalcite, and oscillating for 3 hours; then drying, smashing, putting into a high-temperature tube furnace, and heating for 2-4 hours at the temperature of 500-800 DEG C under the action of nitrogen, thus obtaining the bimetallic oxide / carbon composite material; and when the bimetallic oxide / carbon composite material is applied to removal of lead, cadmium and copper ions in water, the good effect is realized. The prepared bimetallic oxide / carbon composite material has the advantages that a preparation technology is simple, conditions are easy to control, the adsorption capacity is high, heavy metal ions in water can be effectively removed, and composite material preparation and adsorption process is environmentally friendly.

Description

technical field [0001] The invention relates to a preparation method of a double metal oxide / carbon composite material, which is applied to the removal of heavy metal ions in water and belongs to the technical field of composite material preparation and water treatment. Background technique [0002] Hydrotalcite is a kind of anionic clay that has developed rapidly in recent years. It is a layered compound with a two-dimensional template structure. Its typical chemical formula is: [M 1-x 2+ m x 3+ (OH) 2 ][A n- ] x / n ·yH 2 O, where M 2+ and M 3+ are divalent and trivalent metal cations on the laminate, respectively; A n- is an interlayer anion; x is M 3+ with (M 2+ +M 3+ ) molar ratio, usually ranging from 0.17 to 0.33; y is the number of interlayer water molecules. The hydrotalcite has a special structure, the anions between the layers are exchangeable, the cations on the main layer are adjustable, and have a memory effect. It has good adsorption and can be wid...

AI Technical Summary

Problems solved by technology

However, it is difficult to treat the waste hydrotalcite after dye adsorption, and there are few related studies, and there is no report on the method of roasting the hydrotalcite after dye adsorption to prepare double metal oxide / carbon composites

[0004] In recent years, with the rapid development of industry, agriculture and economy, heavy metal pollution in various water environments has become increasingly serious. The biggest feature of heavy metal pollution is that heavy metals cannot be degraded in the environment, that is, once water or soil is polluted by heavy metals, their own purification effect cannot remove pollution