Synthesis of sulfamic acid supported on Cr-MIL-101 as a heterogeneous acid catalyst and efficient adsorbent for methyl orange dye

摘要: Typical highly porous metal–organic framework (MOFs) materials based on chromium benzenedicarboxylates (Cr-BDC) were prepared through a one-pot hydrothermal synthesis, and then modified by loading the appropriate ratio of sulfamic acid (SA) using simple impregnation technique. Pure MIL-101 was characterized XRD, TEM, SEM FT-IR measurements. TEM measurements confirmed that particles preserved their regular octahedral structure after with different weight contents acid. The total number sites Bronsted to Lewis (B/L) examined potentiometric titration pyridine adsorption. strength surface acidity SA/MIL-101 gradually increased modification Cr-MIL-101 crystals up 55 wt%, decreased again. catalytic performance solid catalysts in synthesis 14-phenyl-14H-dibenzo [a,j] xanthene 7-hydroxy-4-methyl coumarin. In two reactions, sample 55% loaded displayed highest activity acidity. adsorption behaviors for methyl orange (MO) as an anionic dye studied, exceptionally suitable Langmuir isotherm. All adsorbents showed high capacity at 25 °C. results indicate changing amount MIL-101.