Preparation method of wheat straw and hydrotalcite composite material capable of adsorbing cobalt ions in electroplating water

Abstract

The invention belongs to the field of water treatment materials and relates to a preparation method of a wheat straw and hydrotalcite composite material capable of adsorbing cobalt ions in electroplating water. Modified hydrotalcite is composited to pore channels of ammoniated straw, and the preparation method comprises specific processes as follows: wheat straw washing, ammoniation, hydrotalcite modification, composite material preparation and the like. The prepared wheat straw and hydrotalcite composite material has the advantages as follows: (1), hydrotalcite is immobilized to the wheat straw through epoxy resin, the characteristics of small density and large specific surface area of the wheat straw can be played, and further, the advantage that the hydrotalcite has high adsorption capacity on heavy metal cobalt ions is used; (2), compared with hydrotalcite powder, the composite material solves the problems of clustering and caking of the hydrotalcite powder and reduced cobalt ion adsorption and can solve the problem of secondary pollution caused by the fact that the hydrotalcite for adsorbing cobalt ions is difficult to recover; (3), compared with the wheat straw, the composite material increases the cobalt ion saturation adsorption quantity greatly and avoids overflow pollution of organic carbon of the wheat straw in a water treatment process. The cobalt ion adsorption quantity of the prepared composite material is increased to 498.5 mg / g, and the composite material can be applied to cobalt-containing wastewater treatment for an electroplating plant and has broad market prospects.

Description

technical field [0001] The invention belongs to the technical field of water treatment materials, and in particular relates to a preparation method of a wheat straw hydrotalcite composite material which absorbs cobalt ions in electroplating water. Background technique [0002] Electroplating is a process that uses electrochemical methods to decorate, protect and obtain some new properties on metal and non-metal surfaces. The electroplating process was listed as one of the 25 restricted industries by the Chinese government in 1994 due to its pollution. However, from the current development status at home and abroad, electroplating technology is an indispensable part of modern industry and has no tendency to be fully replaced by other technologies. Instead, while constantly developing new technologies and new processes, it focuses on the prevention and control of electroplating pollution. [0003] With the development of society, a large amount of untreated heavy metal wastew...

AI Technical Summary

Problems solved by technology

Both cobalt ions and soluble cobalt salts are toxic and can be harmful to human health and plant growth