Preparation method of potassium permanganate sustained-release agent

Abstract

The invention relates to a preparation method of a sustained-release composition. The preparation method comprises the following steps: adding absolute ethanol to stearic acid, stirring fully, heating up to 70-80 DEG C in a water bath, sequentially adding polyethylene glycol 4000 and potassium permanganate while stirring, stopping stirring, performing ultrasonic treatment, reducing the temperature to be less than 35 DEG C while stirring, standing and filtering, and drying at normal temperature for 2h so as to obtain a potassium permanganate sustained-release agent. The infrared spectrum analysis is performed on the stearic acid and the sustained-release agent, and the results show that the stearic acid is coated on the surface of the potassium permanganate in a chemical bonding manner instead of simple physical adsorption. The environmental electron microscope scanning analysis is performed on the sustained-release agent before and after the sustained release, and the results show that the surface of the sustained-release agent adsorbs a certain amount of potassium permanganate, which is dissolved in water firstly to form some holes and gaps, and the potassium permanganate in the core of the sustained-release agent is slowly released into the water body through the holes and gaps, thereby taking a sustained-release effect.

Description

technical field [0001] The invention relates to a preparation method of a sustained-release composition. Background technique [0002] Aquifer pollution caused by heavy non-aqueous phase liquids (DNAPLs) has become a global environmental pollution problem. DNAPLs have the characteristics of higher density than water, low water solubility, weak mobility, and refractory degradation, and can penetrate the aquifer and stay at the bottom of the aquifer, making it more difficult to repair. Since the 1990s, KMnO 4 As an in-situ chemical oxidation technology for remediating groundwater pollution, more and more people pay attention to it. And has been vigorously developed. In most applications, potassium permanganate is introduced into contaminated areas of soil and groundwater in the form of an aqueous solution, where it oxidizes in contact with the pollutants. But KMnO 4 After entering the soil in the form of aqueous solution, the directionless rapid dispersion and non-s...

AI Technical Summary

Problems solved by technology

But KMnO 4 After entering the soil in the form of aqueous solution, the non-directional rapid dispersion and non-selective consumption make the oxidant distribution in the DNAPLs pollution zone (high oxidant demand zone) insufficient, so that its own utilization efficiency is extremely low

On the other hand, 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.