Granular Ln-MOF@Activated Carbon Composite for Highly Selective and Sensitive Detection of Cr3+ Cations
Yuebin Liu, Jingran Yu, Zhiyu Zhang, Jinhua Feng, Weihai Lin, Ming Xue
Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (6) : 1275-1281.
Granular Ln-MOF@Activated Carbon Composite for Highly Selective and Sensitive Detection of Cr3+ Cations
Lanthanide metal-organic frameworks (MOFs) have received special attention due to their unusual coordination characteristics and exceptional luminescence properties, while their development has extremely limited by the cost effective and powder form. Herein, a gentle and facile strategy was developed to create a granular lanthanide MOFs@activated carbon (AC) composite. The obtained granular Tb-BTC@AC composite displays high fluorescent selectivity and sensitivity towards Cr3+ cations in water with quenching efficiency up to 90.12%, and shows great sensitivity in the range of 10−5–10−4 mol/L with the Stern-Volmer constant of 2.224×103 L/mol. Benefited by the high surface area, the abundant self-assembly space was provided for the self-assembling of the Lanthanide MOFs, which leads to promising Cr3+ cation-recognition ability with low MOF quantity. Also, the large size (with an average diameter of 2 mm) and shaped form of this new composite material reduced the threshold of MOF application.
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