Abstract
A new type of economical covalent organic framework material(COF), namely resin based covalent organic framework material, was prepared by combining resin and covalent organic framework material by hydrothermal synthesis, which was based on the preparation of traditional COF material(TpBD COF). The properties of the material and covalent organic framework material were compared in the way of characterization, and the possible reaction mechanism was analyzed. The solid phase extraction separation (SPE) ability of this material for four kinds of phenolic endocrine disrupting compounds (bisphenol F, bisphenol A, octylphenol and nonylphenol) in beverage samples was investigated. The results showed that the prepared COF materials had abundant internal channels, ordered structure, large specific surface area (TpBD COF: 814.6 m2/g and resin based COF: 623.9 m2/g) and good thermal stability (pyrolysis temperature was 443 °C and 437 °C, respectively). Solid phase extraction experiments demonstrated that the two COF materials as adsorbent of solid phase extraction column had ideal adsorption separation effect and good anti-interference ability, and had strong anti-interference ability. The SPE effect was superior to the traditional solid phase extraction column. The precision RSD of this method was less than 3%. This SPE method had high recovery and could be reused (carbonated beverage: 98.18–102.18% and beverage: 98.52–101.79%), In addition, the recovery of the material did not change significantly in the 50 cycles of solid phase extraction, indicating that the material had good stability and could be reused, which could meet the requirements for the detection and analysis of trace pollutants in environmental samples. The resin based COF material prepared in this study could reduce the cost of monomer uses and provide a possibility for its industrial production. At the same time, as an efficient SPE adsorbent, it also provided a new research scheme for the enrichment of trace phenolic endocrine disruptors in beverage samples.
Highlights
Phenolic endocrine disruptors (EDCs) have attracted widespread attention because they mimic the effects of endogenous hormones and interfere with the function of endocrine organs, causing serious threats to human health
The results indicated that this novel Covalent organic frameworks (COFs) material could be used as a reference for the enrichment and detection of EDCs in environmental samples
The results proved that the solid phase extraction effect of X-A model was TpBD filler Solid phase extraction (SPE) column≈resin based COF material filler SPE column>commercial extraction column, and it could be seen from the solid phase extraction effect that the adsorption and separation effect of the new material as solid phase extraction filler was similar to that of other COF materials, which indicated that the prepared new COF material had good performance
Summary
Phenolic endocrine disruptors (EDCs) have attracted widespread attention because they mimic the effects of endogenous hormones and interfere with the function of endocrine organs, causing serious threats to human health (including reproductive dysfunction, birth defects, metabolic disorders and some malignant tumors [1,2]). [3,4,5,6] while nonylphenol (NP) and octyl phenol (OP) are widely used in the production of plastic bags, plasticizers, detergents, pesticides, etc [7,8,9,10] These EDCs widely exist in the environment, causing potential harm to human health [11,12], and the amount of these disruptors is very small in environmental samples. Covalent organic frameworks (COFs), as a new type of porous material, have a larger specific surface area and porous structure, and good thermal stability It has great potential as an ideal adsorbent for solid phase extraction pretreatment and enrichment of organic compounds [17,18,19]
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