Surface Structure and Adsorption Properties of Diatomite
The specific surface area of domestic diatomite is usually 19 m2/g～65m2/g, the pore radius is 50nm-800nm, and the pore volume is 0.45 cm3/g 0.98 cm3/g. Pretreatment such as pickling or roasting can improve its specific surface area. , increasing the pore volume. The adsorption performance of diatomite is closely related to its physical structure and chemical structure. Generally speaking, the larger the specific surface area, the greater the adsorption capacity; the larger the pore size, the greater the diffusion rate of the adsorbate in the pores. It is more favorable to reach the adsorption equilibrium. However, under a certain pore volume, the increase of the pore size will reduce the specific surface area, thereby reducing the adsorption equilibrium; when the pore size is constant, the larger the pore volume, the greater the adsorption capacity. In recent years, a lot of research has been done on the modification of diatomite, and there are different modification methods for different wastewaters.
Diatomaceous earth is modified with polymers.
This modification method mainly utilizes some properties of polymers, and these polymers used for diatomite modification adsorb very quickly on the surface of diatomite. Due to these properties of the polymer, the diatomite was modified by attaching it to the surface of diatomite, and the diatomite was modified with polyaniline to obtain a bright yellow powder containing 8% polyaniline. The modified diatomite has a certain conductivity, making it conductive, thereby increasing the removal rate of impurities in sewage.
Modification of diatomaceous earth with polyethyleneimine
The optimum concentration of polyethyleneimine adsorbed on diatomite and the optimum reaction conditions were obtained through experiments. Studies have shown that there is a strong electrostatic force between diatomite and polyethyleneimine, and the two are easily combined. The modified diatomite is positively charged in a wide pH range. And in the research, it is known that the diatomite modified with polyethyleneimine has a good ability to remove phenol.
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