Silica gel-polyethylene polyamine, preparation method and application thereof to absorbing heavy metal ions

Abstract

The invention belongs to the technical field of absorbing materials of heavy metal and relates to silica gel-polyethylene polyamine and a polyhydroxy chelate absorbing material, an amine carboxyl chelate absorbing material and a pyridine chelate absorbing material prepared from the silica gel-polyethylene polyamine. In the structural formula of the silica gel-polyethylene polyamine, n value is 1 to 10. An amine group, a polyhydroxy group, an amine carboxyl group and a pyridine group in the absorbing material generate a chemical complexation action with heavy metal ions in a water solution, thereby takes a specificity absorbing function on the heavy metal ions. The invention has the characteristics of high absorbing selectivity, high absorbing capacity, easy regeneration, recycling and low transformation expansion rate in the absorbing-desorbing process.

Description

technical field The invention belongs to the technical field of heavy metal adsorption materials, relates to a silica gel-polyethylene polyamine and a preparation method thereof, and also relates to a polyhydroxy chelate type adsorption material and an aminocarboxyl chelate prepared from silica gel-polyethylene polyamine. Composite adsorption materials and pyridine chelation adsorption materials. Background technique There are often heavy metal ions in water, such as lead, cadmium, mercury, chromium, copper, nickel, zinc, etc. Since these heavy metal ions will cause pollution, they need to be removed from the water. At present, there are many technical solutions for the removal, separation or enrichment and recovery of heavy metal ions existing in water bodies, the main ones are as follows: Chemical drug purification treatment such as precipitation-flocculation method is not thorough, and other impurities are introduced in the treatment process, and its treatment property ...

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Problems solved by technology

However, the above-mentioned patents have the following defects: (1) these three polyamines, polyethyleneimine, polyvinylamine and polyallylamine, have relatively large molecular weights, and silica gel itself is a high polymer. Poor reaction kinetics, long grafting reaction time and low grafting rate during the grafting process; (2) The grafting reaction process of the above three polyamines is prone to gelation, and only stays in the laboratory (3) the above-mentioned three kinds of polyamines are expensive and lead to high preparation costs of silica gel-polyamine composites, which also severely limit their large-scale production and application in industry

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