Method for desorbing heavy metal ions on surface of plastic

Abstract

The invention discloses a method for desorbing heavy metal ions on the surface of a plastic. The method comprises the steps that the plastic with the heavy metal ions adsorbed on the surface is soakedin an ethylenediamine tetraacetic acid disodium aqueous solution, and the metal ions are desorbed and transferred from the surface of the plastic to the ethylenediamine tetraacetic acid disodium aqueous solution; and the ethylenediamine tetraacetate acid disodium aqueous solution is separated from the plastic. Compared with an existing acid soaking method and a high temperature digestion method,the method is better in desorption effect and simple in operation, and an economical and feasible method and path are provided for environmental ecological safety evaluation and recycling of microplastics.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, and in particular relates to a desorption method for heavy metal ions on the surface of plastics. Background technique [0002] Microplastics, generally referring to plastic particles or fragments with a size smaller than 5 mm, are a new type of pollutant. Since the aging effects of ultraviolet light and weathering will increase the number of voids and oxidized functional groups on the surface of microplastics, microplastics in the natural environment will not only release pollutants, but also produce heavy metal ions such as zinc, copper, and cadmium in the environment. The role of enrichment and migration greatly affects environmental organisms, which in turn affects human health ("Research progress on the adsorption behavior of microplastics and their impact on organisms", Qushasha et al., Journal of Environmental Hygiene, February 2017, No. 7 Vol. 1, pp. 75-78). The traditiona...

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Problems solved by technology

Since the aging effects of ultraviolet light and weathering will increase the number of voids and oxidized functional groups on the surface of microplastics, microplastics in the natural environment will not only release pollutants, but also produce heavy metal ions such as zinc, copper, and cadmium in the environment. The role of enrichment and migration greatly affects environmental organisms, which in turn affects human health ("Research progress on the adsorption behavior of microplastics and their impact on organisms", Qushasha et al., Journal of Environmental Hygiene, February 2017, No. 7 Vol. 1, pp. 75-78)

Traditional methods for treating heavy metal ions adsorbed on the surface of microplastics include acid immersion method and high-temperature digestion method. The acid immersion method has problems, especially for incomplete metal desorption on the surface of aging microplastics and easy acid corrosion of equipment. The high-temperature digestion method It will directly destroy the microplastic body and hinder the recycling of microplastics

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