In-situ preparation of montmorillonite nanoparticle, and method for removing heavy metals in fruit juice by using montmorillonite nanoparticle

Abstract

The invention provides an in-situ preparation method for a magnetic montmorillonite nanoparticle and application of the magnetic montmorillonite nanoparticle to removal of heavy metals in fruit juice. The method mainly comprises the following steps: adding neutral montmorillonite into iron ion mixed liquor prepared from iron chloride and ferrous chloride under the protection of nitrogen; and preparing the magnetic montmorillonite nanoparticle via chemical co-precipitation in-situ reaction and placing the prepared magnetic montmorillonite nanoparticle in fruit juice containing heavy metal so as to remove the heavy metals via adsorption. The magnetic montmorillonite nanoparticle prepared in the invention is free of latent safety risks; the preparation method is simple and is easy to operate; the magnetic montmorillonite nanoparticle has the characteristics of fast speed in adsorption of heavy metals in fruit juice, convenience in recovery and little influence to the quality of fruit juice, the adsorption capability of the magnetic montmorillonite nanoparticle reaches 6.4 mg / g, the removal rate of heavy metals in fruit juice can reach 90% or above, and the reservation rate of anthocyanin substances like anthocyanidin in fruit juice reaches 80% or above; and the magnetic montmorillonite nanoparticle is substantially improved in the removal rate of heavy metals in fruit juice and reduces influence to the quality of fruit juice.

Description

technical field [0001] The invention belongs to the field of material preparation and food processing, and in particular relates to an in-situ preparation of montmorillonite nanoparticles and a method for removing heavy metals in fruit juice. Background technique [0002] In addition to rich nutritional value, fruit juices have different levels of anti-oxidation, liver damage repair, and even anti-cancer, anti-hypertension and other health effects. However, the problem of heavy metal pollution seriously restricts the healthy and rapid development of related industries. Therefore, solving the problem of heavy metal pollution has become one of the key scientific and technological issues to ensure the rapid and healthy development of my country's fruit juice processing industry, and it is also an urgent need for current industrial development. [0003] Physical adsorption is a common method for removing heavy metals in liquids. Physical adsorbents can effectively absorb and rem...

AI Technical Summary

Problems solved by technology

[0003] Physical adsorption is a common method for removing heavy metals in liquids. Physical adsorbents can effectively absorb and remove heavy metals in liquid environments. However, fruit juices such as sweet potato juice are rich in sugars and other substances. Separation and enrichment has become a limiting factor for its widespread use in fruit juice processing such as sweet potato juice

As a kind of mineral composite powder adsorbent, montmorillonite can effectively adsorb and remove heavy metal ions, but the difficulty of recovery after adsorption has seriously restricted the application of heavy metal adsorption materials such as montmorillonite, and the existing magnetic montmorillonite The preparation method uses epoxy resin as the cross-linking material, which has potential safety risks in food processing and the preparation process is relatively cumbersome

So far, the use of magnetic montmorillonite materials to adsorb and remove heavy metal ions in food products is still blank.

Images