Harnessing an amide-based covalent organic framework in solid-phase extraction forchlorophenol analysis in industrial wastewaters

An amide-based covalent organic framework, denoted as TMC/EDA-COF, was successfully synthesizedusing the reaction between ۱,۳,۵-trimesoyl chloride and ethylenediamine. The structure and morphology of theCOF were characterized using FT-IR, NMR, XRD, SEM, EDX, and BET. The COF was employed as SPE adsorbentfor the sampling and preconcentration of chlorophenols from industrial wastewater samples prior to HPLC-UV.The experimental parameters influencing the extraction efficiency were investigated and optimized using a Box-Behnken-design. Under optimized conditions, calibration curves exhibited good linearities over the range of۰.۰۰۳-۱۰ μg mL−۱ with R۲ ranging from ۰.۹۹۸۲ to ۰.۹۹۹۹. The method's limits of detection ranged from ۰.۰۰۱ to۰.۰۱ μg mL−۱. Good repeatability was achieved with RSD below ۴.۷%.

کلیدواژه ها:

Covalent organic framework ، Solid-phase extraction ، Chlorophenols ، HPLC-UV ، Box- Behnken design