Metal–organic framework (MOF) particles are one of the most promising adsorbents for removing organic contaminants from wastewater. However, powder-type MOF particles face challenges in terms of utilization and recovery. In this study, a novel bead-type adsorbent was prepared using activated carbon based on the zeolitic imidazolate framework-8 (AC-ZIF-8) and a regenerated cellulose hydrogel for dye removal. AC-ZIF-8 particles with a large surface area were obtained by carbonization and chemical activation with KOH. The AC-ZIF-8 powders were efficiently immobilized in hydrophilic cellulose hydrogel beads via cellulose dissolution/regeneration. The prepared AC-ZIF-8/cellulose hydrogel (AC-ZIF-8/CH) composite beads exhibit a large specific surface area of 1412.8 m/g and an excellent maximum adsorption capacity of 565.13 mg/g for Rhodamine B (RhB). Moreover, the AC-ZIF-8/CH beads were effective over a wide range of pH, temperatures and for different types of dyes. These composite beads also offer economic benefits through desorption of dyes for recycling. The AC-ZIF-8/CH beads can be produced in substantial amounts and used as fillers in a fixed-bed column system, which can purify the continuous inflow of dye solutions. These findings suggest that our simple approach for preparing high-performance adsorbent beads will broaden the application of dye adsorbents, oil–water separation, and catalysts.

中文翻译：

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多孔 ZIF-8 碳/纤维素复合珠：用于水处理的高效且可扩展的吸附剂

金属有机骨架（MOF）颗粒是去除废水中有机污染物最有前途的吸附剂之一。然而，粉末型MOF颗粒在利用和回收方面面临挑战。在本研究中，使用基于沸石咪唑酯骨架-8（AC-ZIF-8）的活性炭和再生纤维素水凝胶制备了一种新型珠型吸附剂，用于去除染料。通过碳化和KOH化学活化得到具有大表面积的AC-ZIF-8颗粒。通过纤维素溶解/再生，AC-ZIF-8粉末被有效地固定在亲水性纤维素水凝胶珠中。制备的AC-ZIF-8/纤维素水凝胶（AC-ZIF-8/CH）复合珠表现出1412.8 m/g的大比表面积和对罗丹明B（RhB）的优异的最大吸附容量565.13 mg/g。此外，AC-ZIF-8/CH 珠在广泛的 pH 值、温度和不同类型的染料中均有效。这些复合珠还通过解吸染料进行回收而提供经济效益。 AC-ZIF-8/CH珠可以大量生产并用作固定床柱系统中的填料，可以净化连续流入的染料溶液。这些发现表明，我们制备高性能吸附剂珠的简单方法将拓宽染料吸附剂、油水分离和催化剂的应用。