Chemical immobilization of amino acids into robust metal–organic framework for efficient SO2 removal

Zhenliang Zhu, Peixin Zhang, Bei Li, Shixia Chen, Qiang Deng, Zheling Zeng, Jun Wang, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

Abstract

Adsorptive removal of trace SO2 emissions from flue-gases can significantly reduce energy and water consumption and minimize the amount of unmanageable waste, however, this remains a great challenge. Herein, we report a universal strategy of chemical immobilization of amino acids into a robust metal–organic framework to enhance deep desulfurization. The grafted amino acid resulted in the formation of pores with compatible pore sizes and created abundant N-containing moieties for selective SO2 adsorption. MOF-808-His (His = l-histidine) exhibited a top-ranking SO2 uptake (10.4 mmol g−1) with an excellent SO2/CO2 selectivity (90.5) under ambient conditions; furthermore, MOF-808-His could be easily regenerated. Breakthrough curves verified its excellent separation performances with water vapor and real flue-gas compositions. Computational simulations confirmed the vital role of immobilized amino acids in improving the SO2 capture ability and selectivity. As a proof-of-concept, five natural amino acids were immobilized into MOF-808; all samples displayed improved adsorptive desulfurization performances.

Original languageEnglish (US)
Article numbere17300
JournalAIChE Journal
Volume67
Issue number9
DOIs
StatePublished - Sep 2021

Keywords

  • adsorptive separation
  • amino-acid immobilization
  • deep desulfurization
  • metal–organic frameworks
  • molecular separation

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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