Preparation method of trimetal MIL-101 (FeNiTi) material with high spinning Fe < 3 + >

The invention provides a preparation method of a trimetal MIL-101 (FeNiTi) material with high sensitivity and high spinning Fe < 3 + >, which is used for surface enhanced Raman spectroscopy (SERS) detection. According to the method, MIL-101 (Fe) is modified, heterovalent transition metals Ni < 2 + > and Ti < 4 + > are gradually introduced, Fe < 3 + > in MOF can be successfully converted from low spinning to high spinning, the proportion of high spinning is regulated, and finally the SERS active substrate based on the non-noble metal and having high detection sensitivity is obtained. According to the invention, a metal organic framework MIL-101 (Fe) is used as a raw material, and a trimetal MIL-101 (FeNiTi) material with a high spinning Fe < 3 + > proportion of 100% is obtained by adding different-valence transition metal elements Ni < 2 + > and Ti < 4 + >. The prepared trimetal MIL-101 (FeNiTi) material with high spinning Fe < 3 + > shows excellent SERS (Surface Enhanced Raman Scattering) detection activity a