Nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as preparation method and application thereof

Abstract

The invention discloses a nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as a preparation method and application thereof. The main preparation method comprises the following steps of: (1) pretreating a PVDF microfiltration membrane; (2) functioning the PVDF filter membrane by taking acrylic acid (AA) as a functional monomer; (3) respectively immersing the functioned PVDF filter membrane into sodium salt and soluble iron salt solutions for ion exchange, loading iron ions on the functioned PVDF filter membrane; and (4) immersing the PVDF filter membrane into a borohydride salt solution so as to prepare the nano-loading zero-valent-iron-based PVDF compound material under the strong reduction action. By respectively repairing simulative dyeing wastewater, heavy metal wastewater and anionic organic wastewater at the room temperature through using the reduction function of the material, the nano-loading zero-valent-iron-based PVDF compound material as well as the preparation method and the application thereof disclosed by the invention are conveniently and simply operated and easily recycled, have the advantages of low cost and good dispersity of nano iron particles, and are capable of reducing ecological risks caused by that the nano iron particles flow into water so as to improve the service cycle of the compound material. The nano-loading zero-valent-iron-based PVDF compound material can be regarded as an environment-friendly environment restoration material.

Description

technical field

[0001] The invention belongs to the technical field of water treatment, and relates to a nano zero-valent iron-loaded PVDF composite material for water treatment and a preparation method thereof, and the composite material is applied to the decolorization of dye wastewater and the removal of heavy metal ions and inorganic anions in wastewater. Background technique

[0002] Laboratory and field tests in the past 15 years have shown that nano-ZVI particles, as an emerging engineering nanomaterial, exhibit superior removal and degradation capabilities in contaminated water and soil remediation. The so-called nano-iron particles refer to iron particles with a particle diameter of 1-100 nm. Compared with micron-sized iron particles, nano-iron particles have higher specific surface area and higher reactivity due to their small size; at the same time, iron itself has the characteristics of low cost and environmental friendliness, which is why it is widely used to re...

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