Preparation method for sustained release potassium permanganate microcapsule

Abstract

The invention discloses a preparation method for a sustained release potassium permanganate microcapsule, comprising the following steps that (1), stearic acid is arranged in a reactor, absolute ethyl alcohol is added to the reactor, the reactor is heated in water bath, the solution in the reactor is sufficiently stirred until the stearic acid is completely dissolved; (2), polyethylene glycol 4000 and potassium permanganate are added to the reactor, potassium permanganate is homogeneously dispersed in the solution through ultrasound, the ultrasound is stopped, the solution is stirred and naturally cooled to the temperature of below 35 DEG C, and the reaction is finished after solid is completely dissolved out; and the mass ratio of potassium permanganate to stearic acid is 1:1-1:3. The preparation method for the sustained release potassium permanganate microcapsule solves the problems of low utilization rate of oxidant, high non-preference consumption and mass transfer of oxidant in the process of removing underground water pollutants by the in-situ chemical oxidation of liquid and powder potassium permanganate, and realizes the purposes of sustained release, effective transmission and efficient oxidation of the oxidant.

Description

【Technical field】 [0001] The invention relates to a preparation method of slow-release potassium permanganate microcapsules used for repairing groundwater chlorinated olefin pollutants. 【Background technique】 [0002] With the development of society and economy, a large number of organic solvents are used by human beings in practice. The unreasonable discharge and improper treatment of these organic substances will cause them to enter the environment and pollute groundwater resources. Among them, chlorinated solvents (vinyl chloride) are denser than water and belong to Dense Non-Aqueous Phase Liquid (DNAPL), which are easy to move underground, thereby increasing the depth and breadth of groundwater and soil pollution. , making it very difficult to remediate and remediate, and has become a research hotspot in soil and groundwater pollution remediation abroad. The most common DNAPL pollutants are: trichlorethylene (TCE), tetrachlorethylene (PCE) and other chlorinated hydrocar...

AI Technical Summary

Problems solved by technology

However, the rapid dispersion and non-selective consumption of potassium permanganate in the form of aqueous solution into the soil make the oxidant distribution in the DNAPLs pollution zone, that is, the high oxidant demand zone insufficient, so that its own utilization efficiency is extremely low

In addition, due to the strong polarity of the surface of potassium permanganate, it is difficult to disperse in non-polar solvents, which also leads to poor pollution repair effect of DNAPLs.

Images