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Synthesis of two novel H4TCPBDA-based metal–organic frameworks and their application in lead ion adsorption

Wu Yanzi,Ma Yujie,Xu Guanhong,Xia Tianyi,Liu Wenxuan,Dong Zezhong,Yuan Qing,Zhang Cong,Hu Qin

Two novel porous metal–organic frameworks (MOFs) Cu(TCPBDA) and Cd(TCPBDA) based on a new ligand, namely N,N,N′,N′-tetrakis(4-carboxyphenyl)biphenyl-4,4′-diamine (H 4 TCPBDA), were synthesized by solvent thermal method and characterized with scanning electron microscopy, powder X-ray diffraction, BET analysis and spectrofluorometry. The static adsorption of the two MOFs for lead ions (Pb 2+ ) was investigated. Cu(TCPBDA) showed a higher adsorption capacity for Pb 2+ compared with Cd(TCPBDA), and its maximum adsorption capacity was 300 mg/g. The adsorption performance of Cu(TCPBDA) was then further studied. It was found that the adsorption of Cu(TCPBDA) for Pb 2+ fitted the Freundlich model and pseudo-second-order equation very well. The adsorption ability of Cu(TCPBDA) was applied to fast and efficient adsorption for Pb 2+ in toner. The results indicates that Cu(TCPBDA) is a promising material in adsorption and removal of heavy metal ions.