Preparation method of sodium alginate-MOFs composite microsphere for adsorbing heavy metal selenium

Abstract

The invention discloses a preparation method of a sodium alginate-MOFs composite microsphere for adsorbing heavy metal selenium. The preparation method comprises the steps: adding MIL-101 into a sodium alginate solution, and carrying out stirring; then, adding a CaCl2 water solution, and carrying out a crosslinking reaction to obtain a composite microsphere; and finally, carrying out microwave treatment in a microwave reaction cavity to obtain a sodium alginate-MOFs composite microsphere water body purifying material; the sodium alginate solution refers to a sodium alginate solution having themass percentage concentration of 0.5-3.0% and taking water as a solvent; the stirring refers to the step of carrying out uniform stirring under a room temperature condition by using an electromagnetic stirrer, and then, ultrasonically removing air bubbles; the CaCl2 water solution refers to a CaCl2 water solution having the concentration of 0.05-1.50mol / L and taking water as a solvent; and the microwave treatment refers to the step of carrying out treatment at the power of 300W-1200W for 3-45min. The preparation method has the characteristics such as simple preparation process and conveniencein use.

Description

technical field [0001] The invention relates to a method for preparing sodium alginate-MOFs composite microspheres that adsorb heavy metal arsenic, and belongs to the technical field of water treatment adsorbent preparation. Background technique [0002] Arsenic is a very stable, non-degradable pollutant and an environmental pollutant that can accumulate for a long time. If people stay in an environment containing arsenic for a long time, it will lead to a decline in intelligence; when arsenic ions accumulate in the body to a certain amount, people will have chronic poisoning such as mental disorders and headaches. [0003] MIL-101 has huge pore volume and specific surface area, and has both mesopore structure and micropore channels, and can exist stably in air and water. And has rich functional groups, is the adsorption of Pb in water 2+ ideal material. However, if MIL-101 is directly used to adsorb arsenic ions in water, the adsorption effect is not ideal, and it is onl...

AI Technical Summary

Problems solved by technology

However, if MIL-101 is directly used to adsorb arsenic ions in water, the adsorption effect is not ideal. It is only similar to the adsorption effect of other adsorption materials and does not have a significant adsorption effect.