The indissolubility or poor dissolubility of covalent-organic frameworks (COFs) limits their wide applications. Here, the COF_BTLP-1 which were prepared by the aminaldehyde condensation between 1,4-benzenedithiol-2,5-diamino-hydrochloride and 1,3,5-triformylbenzene was controllably grown on kenaf stem-derived macroporous carbon (3D-KSC). Compared with COF_BTLP-1 powder, the COF_BTLP-1 grown on 3D-KSC avoided their random orientation effectively. The results showed that the amount of COF_BTLP-1 could be effectively controlled by adjusting the concentration of monomers and growing time. Each unit of COF_BTLP-1 has 12 adsorption sites (6 sulfur atoms and 6 nitrogen atoms) for heavy metal ions (HMIs) and regular holes to facilitate the transfer of HMIs. A large number of adsorption sites of HMIs could identify and captured HMIs selectively, and accordingly Cd²⁺, Pb²⁺, Cu²⁺ and Hg²⁺ could be detected simultaneously by using the COF_BTLP-1/3D-KSC electrode. The detection limits for Cd²⁺, Pb²⁺, Cu²⁺ and Hg²⁺ are 12.3 nM, 11.8 nM, 18.6 nM and 21.4 nM, respectively. The sensitivities are up to 1337.4 μA/μM cm², 1389.0 μA/μM cm² and 886.2 μA/μM cm², 770.0 μA/μM cm², respectively. The COF_BTLP-1/3D-KSC may be also applied in other fields of electroanalytical chemistry.

共价有机框架（COF）的不溶性或不溶性限制了它们的广泛应用。在这里，通过1,4-苯二硫醇-2,5-二氨基盐酸盐与1,3,5-三甲酰苯之间的氨醛缩合制备的COF _BTLP-1可控地生长在洋麻茎衍生的大孔碳上（3D-KSC ）。与COF _BTLP-1粉末相比，在3D-KSC上生长的COF _BTLP-1有效避免了其随机取向。结果表明，通过调节单体浓度和生长时间可以有效控制COF _BTLP-1的量。COF _BTLP-1的每个单位具有12个重金属离子（HMI）的吸附位点（6个硫原子和6个氮原子）和规则的孔，以促进HMI的转移。HMI的大量吸附位点可以选择性地识别和捕获HMI，因此使用COF _BTLP-1 / 3D-KSC电极可以同时检测到Cd 2 ⁺，Pb 2 ⁺，Cu ²⁺和Hg ²⁺。Cd 2 ⁺，Pb 2 ⁺，Cu ²⁺和Hg ²⁺的检出限分别为12.3 nM，11.8 nM，18.6 nM和21.4 nM。灵敏度高达1337.4μA/μM厘米²，1389.0μA/μM厘米²和886.2μA/μM厘米²分别为770.0μA/μMcm ²。COF _BTLP-1 / 3D-KSC也可以应用于电分析化学的其他领域。