Fabrication of Spiny-like Spherical Copper Metal-Organic Frameworks for the Microextraction of Arsenic(III) from Water and Food Samples before ICP-MS Detection

Spiny-like spherical copper metal-organic frameworks (SSC-MOFs) were prepared and characterized via SEM, TEM, EDS, XRD, FTIR and the BET surface area. The fabricated SSC-MOFs were applied to develop a procedure for the microextraction of trace arsenic(III) for preconcentration. The results show that a copper- and imidazole-derived metal-organic framework was formed in a sphere with a spiny surface and a surface area of 120.7 m(2)/g. The TEM confirmed the perforated network structures of the SSC-MOFs, which were prepared at room temperature. The surface functional groups were found to contain NH and C=N groups. The XRD analysis confirmed the crystalline structure of the prepared SSC-MOFs. The application for the process of microextracting the arsenic(III) for preconcentration was achieved with superior efficiency. The optimum conditions for the recovery of the arsenic(III) were a pH of 7 and the use of a sample volume up to 40 mL. The developed SSC-MOF-derived microextraction process has an LOD of 0.554 mu g L-1 and an LOQ of 1.66 mu g L-10. The developed SSC-MOF-derived microextraction process was applied for the accurate preconcentration of arsenic(III) from real samples, including food and water, with the promised performance efficiency.

Automated summary

Spiny-like spherical copper metal-organic frameworks (SSC-MOFs) were synthesized and utilized for the microextraction of trace arsenic(III) for preconcentration. The SSC-MOFs exhibited a spiny surface and a surface area of 120.7 m(2)/g. TEM confirmed the network structures of the SSC-MOFs. XRD analysis confirmed the crystalline structure. The developed SSC-MOF-derived microextraction process showed efficient performance for arsenic(III) preconcentration.