The metal–organic framework (MOF) UiO-66-NH₂ was synthesized and attached to kenaf stem-derived three-dimensional macroporous carbon (3D-KSC) simultaneously, and then, the isothiocyanate functional group was introduced into UiO-66-NH₂ MOFs to prepare UiO-66-NHC(S)NHMe/3D-KSC nanocomposites. The amount of UiO-66-NHC(S)NHMe MOFs on 3D-KSC can be controlled easily by the monomer concentration. There were three adsorption sites (two nitrogen atoms and one sulfur atom) on each structural unit of UiO-66-NHC(S)NHMe for adsorption toward heavy metal ions (HMIs) and well-regulated pores and 3D macropores of 3D-KSC to promote the transfer of HMIs. Therefore, UiO-66-NHC(S)NHMe/3D-KSC nanocomposites can be applied for the removal and electrochemical detection of Cd²⁺, Pb²⁺, Cu²⁺, and Hg²⁺. The detection limits of Cd²⁺, Pb²⁺, Cu²⁺, and Hg²⁺ were 0.0125, 0.0124, 0.0111, and 0.0094 μM, respectively. The sensitivities were 879.1, 887.6, 992.5, and 1160.7 μA μM^–1 cm^–2, respectively. UiO-66-NHC(S)NHMe/3D-KSC showed fine reproducibility and stability as well as strong anti-interference ability. In addition, the HMIs can be removed effectively by UiO-66-NHC(S)NHMe/3D-KSC with the maximum adsorption capacity of 88, 391, 223, and 935 mg·g^–1 for Cd²⁺, Pb²⁺, Cu²⁺, and Hg²⁺, respectively. The results show that UiO-66-NHC(S)NHMe/3D-KSC has great potential for the adsorption and detection of HMIs.

中文翻译：

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UiO-66-NHC(S)NHMe/三维大孔碳用于 Cd2+、Pb2+、Cu2+ 和 Hg2+ 的去除和电化学检测

合成金属有机骨架（MOF）UiO-66-NH ₂并同时连接到红麻茎衍生的三维大孔碳（3D-KSC），然后将异硫氰酸酯官能团引入UiO-66-NH ₂ MOFs 制备 UiO-66-NHC(S)NHMe/3D-KSC 纳米复合材料。3D-KSC 上 UiO-66-NHC(S)NHMe MOF 的量可以通过单体浓度轻松控制。UiO-66-NHC(S)NHMe 的每个结构单元上都有三个吸附位点（两个氮原子和一个硫原子），用于吸附重金属离子 (HMIs) 和 3D-KSC 的良好调节的孔和 3D 大孔促进人机界面的转移。因此，UiO-66-NHC(S)NHMe/3D-KSC纳米复合材料可用于Cd ²⁺、Pb的去除和电化学检测²⁺、Cu ²⁺和Hg ²⁺。Cd ²⁺、Pb ²⁺、Cu ²⁺和Hg ²⁺的检测限分别为0.0125、0.0124、0.0111和0.0094 μM。灵敏度分别为 879.1、887.6、992.5 和 1160.7 μA μM ^–1 cm ^–2。UiO-66-NHC(S)NHMe/3D-KSC表现出良好的重现性和稳定性以及较强的抗干扰能力。此外，UiO-66-NHC(S)NHMe/3D-KSC可以有效去除HMIs，对Cd ²⁺、Pb ²⁺的最大吸附量分别为88、391、223和935 mg·g ^–1、Cu ²⁺和 Hg ²⁺， 分别。结果表明，UiO-66-NHC(S)NHMe/3D-KSC在HMIs的吸附和检测方面具有很大的潜力。