Abstract
This work reports an effective strategy to regulate the adsorption and separation performances in metal–organic frameworks. Through a covalent modification method, strongly acidic –SO3H groups were introduced into MIL-101-NH2 to modify the surface charge property. Based on the contrary electrostatic interactions, the resulting MIL-101-N-SO3H-A/B exhibited significantly reversed adsorption and separation performances for ionic pollutants. Moreover, the adsorptions of MB and MO in these MOFs can be fast achieved (equilibrium time < 20 min) and were not weakened obviously by coexisting inorganic salts. In addition, MIL-101-N-SO3H-B showed a high adsorption capacity of 443.3 mg g−1 for MB dye. Thus, this covalent modification strategy provides a guideline to design MOF-based adsorbents with optional adsorption performances.
Published Version
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