Nanowerk  November 4, 2023 Researchers in China have reported a kind of light-responsive MOF adsorption material which was fabricated by covalently immobilizing photoactive spiropyran (SP) molecules onto a chromium(III)-based amino-tagged MIL-101 framework through amide linkages. The photoisomerization of SP moieties provided these materials with reversible binding to metal ions. In the dark, the SP-modified MOFs were capable of adsorbing multiple monovalent and divalent salts from saline water and effectively released the adsorbed ions into water upon exposure to simulated sunlight. The MOFs showed excellent salt adsorption capacity, of which the MOF with an SP modification ratio of 39% had an […]