Metal‐organic framework functionalized with deep eutectic solvent for solid‐phase extraction of Rhodamine 6G in water and cosmetic products

An NH₂‐MIL‐53(Al)‐DES(ChCl‐Urea) nanocomposite was synthesized for extraction and determination of Rhodamine (Rh) 6G from environmental and cosmetic samples. The deep eutectic solvent (DES) was prepared by mixing choline chloride and urea in a mole ratio of 1:2. NH₂‐MIL‐53(Al)‐DES(ChCl‐Urea) nanocomposite was synthesized using the impregnation method at a ratio of 60:40 (w/w). The optimum conditions were determined after NH₂‐MIL‐53(Al)‐DES(ChCl‐Urea) characterization was performed. The optimum conditions were determined as pH 8, adsorbent amount of 15 mg, total adsorption‐desorption time of 6 min, and enrichment factor of 20. The recovery values of the solid‐phase extraction method for water and cosmetic samples under optimum conditions were between 95% and 106%. NH₂‐MIL‐53(Al)‐DES(ChCl‐Urea) nanocomposite was an economically advantageous adsorbent because of its reusability of 15 times. All analyses were performed using the ultraviolet‐visible spectrophotometer. The linear range, limit of detection, and limit of quantification of the method were 100–1000, 9.80, and 32.68 μg/L, respectively. The obtained results showed that the synthesized nanocomposite is a suitable adsorbent for the determination of Rh 6G in water and cosmetic samples. The real sample applications were verified with the high‐performance liquid chromatography system.