Magnetic adsorbent for removing heavy metal in water and method for preparing magnetic adsorbent

Abstract

The invention relates to the technical field of water treatment, and specifically discloses a magnetic adsorbent for removing heavy metals in water and a preparation method thereof. The adsorbent is prepared by sequentially modifying magnetic chitosan-polyvinyl alcohol microspheres through glutaraldehyde cross-linking modification and carbon disulfide modification; wherein the magnetic chitosan-polyvinyl alcohol microspheres are made of chitosan, polyvinyl alcohol Vinyl alcohol and nano-magnetic iron are prepared as raw materials; the mass ratio of chitosan, polyvinyl alcohol and nano-magnetic iron is 1:1:1. The present invention makes the adsorbent magnetic by adding nano-magnetic iron, and uses glutaraldehyde and carbon disulfide to modify the magnetic chitosan-polyvinyl alcohol microspheres to enhance the mechanical strength of the adsorbent and the adsorption effect on heavy metal ions, so that The prepared adsorbent has the characteristics of large adsorption capacity, high removal rate of various heavy metal ions, magnetic separation under an external magnetic field, and renewable recycling, and can be used to remove heavy metals in domestic sewage, industrial wastewater and natural water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a magnetic adsorbent for removing heavy metals in water and a preparation method thereof. Background technique [0002] Water is an important resource for human survival, but heavy metal pollution in water has become a fairly common global problem. Since our country entered the stage of rapid development and urbanization, due to sewage irrigation in agricultural activities, abuse of chemical fertilizers and pesticides, industrial production, including mining, metallurgy, electronics, chemical industry, machinery manufacturing and other industries, the substandard discharge and leakage of wastewater, and the disposal of solid waste Improper treatment, unreasonable recharge of sewage, etc. have caused the problem of heavy metal pollution in water bodies to become increasingly prominent. Although some heavy metals are essential trace elements for the human body, excessive c...

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Problems solved by technology

Common adsorption materials have certain limitations in practical application, and are often limited by problems such as low adsorption capacity, high cost, and unsuitable recycling. For example, Chinese patent CN103447010A discloses a modified polyvinyl alcohol-chitosan microsphere Mercury adsorbent, the adsorbent is obtained by mixing polyvinyl alcohol and chitosan as the matrix, and depositing bromide and titanium dioxide on the surface of the matrix for modification. This adsorbent only has good adsorption performance for metallic mercury, but for other The adsorption performance of heavy metals is poor, and it is not easy to recycle. Therefore, it is of great significance to develop an adsorbent that is conducive to actual recovery and has adsorption and removal performance for various heavy metal ions.