Preparation method of waste resin-based sec-octyl phenoxy acetic acid composite adsorbent

Abstract

The invention discloses a preparation method of a waste resin-based sec-octyl phenoxy acetic acid composite adsorbent. The method comprises the following steps: firstly, neutralizing high-concentration alkali on the surface and in the waste amidoxime chelate resin for recycling gallium from a Bayer circulating mother solution by using acid, drying in a drying oven, directly pretreating, and quickly carbonizing the waste resin in a microwave oven, so that the original compact interior is modified into a loose and porous three-dimensional network structure. The method comprises the following steps: by taking waste resin which is subjected to crushing, ball milling and sieving after microwave carbonization as a carrier framework and sec-octyl phenoxy acetic acid (CA-12) diluted by dichloromethane as a solvent, carrying in a rotary evaporator, and carrying out vacuum drying, thereby synthesizing the waste resin-based sec-octyl phenoxy acetic acid composite adsorbent (CA-12 / SIRs). The adsorbent controls carbon emission from the source, turns waste into wealth, utilizes the surface characteristics of the waste resin to perform microwave carbonization, pore expansion and adsorption group loading, prepares an adsorption material suitable for recycling rare and precious metals in an acid system, and is beneficial to improving the adsorption value of the waste resin and reducing the environmental influence of the waste resin.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of refractory solid hazardous waste, and in particular relates to a preparation method of a waste resin-based sec-octylphenoxyacetic acid composite adsorbent. Background technique [0002] The functional group characteristic of amidoxime chelating resin is that it contains amino (-NH 2 ) and oxime group (=N-OH), so it can coordinate with a variety of metal ions, and therefore has attracted extensive attention. It has been widely used in wastewater treatment and separation and enrichment of metal elements, such as removal of metal cations, extraction of uranium from seawater, recovery of gallium from Bayer solution, etc. However, a large amount of resin is recycled many times and then discarded or shelved as solid waste, which poses potential problems for the environment. For example, in the Guangxi Branch of Aluminum Corporation of China, the amidoxime chelating resin used to adsorb gallium fro...

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Problems solved by technology

At present, the main application of waste resin is carbonization and pyrolysis of waste resin at high temperature to prepare carbon adsorbent to adsorb organic substances or heavy metal ions such as naphthalene, benzene, toluene and phenol, but this process needs to be carried out at a higher temperature and carbonization takes a long time , time-consuming and energy-consuming; and the resin will also emit harmful gases during the high-temperature pyrolysis process

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