Diatomite has the characteristics of porosity, low density, large specific surface area, good adsorption, acid resistance, alkali resistance, insulation, etc., and China is rich in diatomite ore reserves, so diatomite has been used as a new type of adsorption material in recent years. It is widely used in many industrial sectors. Based on a brief introduction to the chemical composition and surface properties of diatomite, this paper reviews the methods of using polyaniline, polyethyleneimine and other polymers to modify diatomite in recent years at home and abroad. Wastewater This paper introduces the current modification methods of diatomite and the research progress of diatomite before and after modification as adsorption material for the adsorption of dyes, heavy metal ions and non-polar aromatic hydrocarbons in industrial wastewater. development trend of adsorbent materials.
Due to the good physical and chemical properties and abundant reserves of diatomite, diatomite has been widely used in environmental, petroleum, chemical and other industrial enterprises in recent years. The following is a brief introduction to the research status and progress of diatomite as an adsorbent in industrial wastewater.
Surface Properties and Adsorption Properties of Diatomite
There are a large number of different kinds of hydroxyl groups on the surface of diatomite. The more hydroxyl groups in diatomite, the better the adsorption performance. Such hydroxyl groups can be converted under heat treatment conditions and change the adsorption properties of diatomite. And these hydroxyl groups have certain activity and can react with other substances to change the adsorption characteristics of diatomite.
Surface charge of diatomaceous earth
Diatomite particles show a certain negative charge. The diatomite surface is negatively charged in most pH ranges, but under acidic conditions, it is positively charged due to the protonation of hydroxyl groups on the diatomite surface. The isoelectric point of diatomite can be shifted on the surface of diatomite.
The technical center of Jilin Yuantong Mine Co., Ltd. now has 42 employees, 18 professional and technical personnel with intermediate and senior titles engaged in the development and research of diatomite, and has more than 20 sets of advanced diatomite special testing instruments at home and abroad. The testing items include Crystalline silicon content, SiO2, A12O3, Fe2O3, TiO2 and other chemical components of diatomite products; product particle distribution, whiteness, permeability, cake density, sieve residue, etc.; trace heavy metal elements such as lead and arsenic required by food safety, Soluble iron ion, soluble aluminum ion, pH value and other items detection.
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Post time: Jan-10-2022