Functional polyelectrolyte/graphene oxide multilayered film as well as preparation method and application thereof

Abstract

The invention belongs to the field of macromolecular / inorganic hybrid materials and ion sensing application and in particular relates to a preparation method of a polyelectrolyte / graphene oxide multilayered film. The preparation method comprises the following steps: firstly, preparing a functional modified graphene oxide dispersion solution; then immersing a base material into a polyethylenimine water solution and adsorbing a polyethylenimine molecular chain on the surface; taking out the base material, washing and drying by blowing; then immersing the polyethylenimine modified base material into the functional modified graphene oxide dispersion solution; adsorbing modified graphene oxide on the surface of the base material due to electrostatic interaction, taking out the base material, washing and drying by blowing; repeating the process to obtain the polyelectrolyte / graphene oxide multilayered film with a uniform lamellar structure. The macromolecular / inorganic hybrid material and heavy metal ions have a coordinated complexing effect and a space matching effect, so that the multilayered film has selectivity and high-capacity heavy metal ion adsorption capability; a quartz crystalmicrobalance technology is utilized for realizing the adsorption response behavior of the multilayered film on various metal ions in water.

Description

technical field [0001] The invention belongs to the fields of preparation of polymer / inorganic hybrid materials, sensing materials and environmental pollution detection, and in particular relates to a functional polyelectrolyte / graphene oxide multilayer film and its preparation method and application. Background technique [0002] Over the past 20 years, extensive economic growth has resulted in the rapid development of my country's national economy, but also seriously polluted the natural environment. Various environmental pollutants, especially heavy metal ions such as cadmium, cobalt, lead and copper ions produced in industrial production, enter the water and soil environment, which not only pollutes the natural environment, but also endangers human survival and health. Therefore, the identification and detection of trace heavy metal ions in water is of great significance for the recovery and reuse of metal elements and early monitoring of environmental pollution. [000...

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Problems solved by technology

Although these techniques have high sensitivity and specificity, they have defects such as complex sample pretreatment, time-consuming operation, expensive instruments and high operating costs, and the need for offline detection, making it difficult to meet the needs of current detection work

The Chinese patent application with the publication number CN 101021515A discloses a method for in-situ sampling, separation, enrichment and measurement of heavy metal ions in water bodies, using osmosis to diffuse heavy metal ions from the inside of the membrane to react with polymer compounds, these Macromolecular compounds are mainly hydroxymethylcellulose, chitosan and sodium polyacrylate, etc., whose functional groups can combine with heavy metal ions, but in fact there is no selective adsorption performance, and the detection steps are complicated and time-consuming; and because they are Using atomic absorption spectrometry to calculate the concentration of heavy metal ions, which cannot be detected in real time

Chinese patent CN200610009925.8 discloses the application of a fluorescent molecular probe in the detection of transition metals and heavy metal ions. 2+ Fluorescent probes for selective fluorescence enhanced recognition. The fluorescent molecular structure is relatively complex, and column chromatography steps are required for separation and purification. It is difficult to realize industrial application as a sensing material, and it is still impossible to achieve online real-time and simple and fast detection

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