Abstract Different adsorbents have been applied to remove various anionic pollutants in water treatment processes. However, the development of economic, sustainable, and high-performance adsorbents is still a challenge. Herein, we introduce a new strategy to produce highly porous (98.96%), very low density (0.015 g/cm3), and cost-effective spherical and nanostructured hybrid aerogels, termed aerobeads, from cellulose nanofibers (CNF) and metal-organic frameworks (MOFs). The zwitterionic MOFs@CNF aerobeads (with 10–50 wt% MOF loading) were synthesized via simple dropping of a cross-linked hydrogel containing CNF and a binary mixture of anionic and cationic MOFs in liquid nitrogen, followed by freeze-drying. The flexible aerobeads (diameter of 2–3 mm) with hierarchical porous structure demonstrated an outstanding adsorption capacity toward both diclofenac (121.20 mg/g) and methyl orange (49.21 mg/g). Moreover, the aerobeads were easily collected after use from the solution without any complicated separation methods or the formation of secondary pollutants.

中文翻译：

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用于去除阴离子污染物的二元金属有机骨架和纤维素纳米纤维的两性离子混合气珠

摘要 不同的吸附剂已被用于去除水处理过程中的各种阴离子污染物。然而，经济、可持续、高性能的吸附剂的发展仍然是一个挑战。在此，我们引入了一种新策略，可以从纤维素纳米纤维 (CNF) 和金属有机框架中生产高度多孔 (98.96%)、极低密度 (0.015 g/cm3) 且具有成本效益的球形和纳米结构混合气凝胶，称为气珠(MOF)。通过将含有 CNF 和阴离子和阳离子 MOF 的二元混合物的交联水凝胶简单滴入液氮中，然后冷冻干燥，合成了两性离子 MOFs@CNF 气珠（MOF 负载量为 10-50 wt%）。具有分级多孔结构的柔性气珠（直径为 2-3 毫米）对双氯芬酸（121.20 毫克/克）和甲基橙（49.21 毫克/克）表现出出色的吸附能力。此外，气珠在使用后很容易从溶液中收集，无需任何复杂的分离方法或二次污染物的形成。