Zeolitic imidazolate framework-8 (ZIF-8) is extensively researched and used because of its exclusive structural and excellent physicochemical properties; however, significant challenges of alleviating the adverse effects of its particle form in many aspects are still faced by the scientific community. In this study, in situ growth of ZIF-8 within the pore channels and surfaces of green cellulose-based wood sponge was attempted through polydopamine-mediated incubation. The wood sponge was prepared by eliminating lignin and hemicellulose from natural balsa wood. Then, the sponge was impregnated with dopamine aqueous solution to yield polydopamine-covered wood sponge (PWS). ZIF-8 crystals were ultimately in situ grown in the substrate after sequential impregnation with zinc nitrate hexahydrate and 2-methylimidazole aqueous solutions at room temperature. Additionally, the effects of the deposition concentration of the dopamine aqueous solution and ZIF-8 incubation time were investigated. The obtained ZIF-8@PWS was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis and thermogravimetric analysis. Finally, the toluene adsorption performance of porous ZIF-8@PWS in aqueous solution was also briefly evaluated, and it was demonstrated that the maximum adsorption capacity was 106.4 mg/g and the removal rate was as high as 94.2%. This work validates the envisioned universal protocol of preparing ZIF-8-decorated porous substrates through the integrated mediating role of polydopamine.

中文翻译：

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来自聚多巴胺仿生矿化的 ZIF-8 装饰木海绵

沸石咪唑骨架-8（ZIF-8）因其独特的结构和优异的理化性能而被广泛研究和应用；然而，科学界仍然面临着减轻其颗粒形态在许多方面的不利影响的重大挑战。在本研究中，通过聚多巴胺介导的孵育，尝试在绿色纤维素基木材海绵的孔道和表面内原位生长 ZIF-8。木质海绵是通过从天然轻木中消除木质素和半纤维素而制备的。然后，用多巴胺水溶液浸渍海绵，得到聚多巴胺覆盖的木质海绵(PWS)。在室温下连续浸渍六水合硝酸锌和2-甲基咪唑水溶液后，ZIF-8晶体最终在基底中原位生长。此外，还研究了多巴胺水溶液的沉积浓度和ZIF-8孵育时间的影响。使用傅里叶变换红外光谱、扫描电子显微镜、X射线衍射、Brunauer-Emmett-Teller分析和热重分析对所得ZIF-8@PWS进行了表征。最后还对多孔ZIF-8@PWS在水溶液中的甲苯吸附性能进行了简要评价，结果表明最大吸附容量为106.4 mg/g，去除率高达94.2%。这项工作验证了通过聚多巴胺的综合介导作用制备 ZIF-8 装饰的多孔基质的设想通用方案。