The emerging global water crisis necessitates the development of solid adsorbents for the removal of organic pollutants from wastewater. Herein, we develop an anionic sulfonate-functionalized covalent organic framework (COF), termed TpStb-SO₃Na, by the Schiff-base condensation between 2,4,6-triformylphloroglucinol (Tp) and 4,4'-diaminostilbene-2,2'-disulfonic acid (Stb-SO₃H) under solvothermal conditions in the presence of sodium acetate. Thanks to the dense sulfonate groups in the periodic one-dimensional channels, the negatively charged TpStb-SO₃Na displayed rapid kinetics (average ∼99% uptake in merely 10 min) and ultrahigh adsorption capacities for multiple cationic dyes including methylene blue (MB, 1078 mg g^-1), crystal violet (CV, 1861 mg g^-1), malachite green (MG, 5857 mg g^-1) and janus green B (JGB, 1339 mg g^-1). Noteworthy, the adsorption capacities of TpStb-SO₃Na toward CV, MG, and JGB were the record-high values among the documented COFs, metal-organic frameworks (MOFs), and other benchmark adsorbents. In addition, the adsorption behaviors of MB, CV, MG, and JGB on TpStb-SO₃Na obeyed the pseudo-second-order adsorption kinetic model. On the contrary, TpStb-SO₃Na presented low adsorption capacity for anionic dyes like methyl orange (MO) and fluorescein sodium (FS), rendering it a promising sorbent for the separation of cationic and anionic dyes based on charge difference. Furthermore, TpStb-SO₃Na was easily regenerated and reused for five cycles with no obvious loss in its adsorption performance. This work uncovers the vast potential of anionic COFs for the effective removal of organic dye pollutants in wastewater.

新出现的全球水危机要求开发固体吸附剂以去除废水中的有机污染物。在此，我们通过 2,4,6-三甲酰间苯三酚 (Tp) 和 4,4'-二氨基芪-2 之间的席夫碱缩合，开发了一种阴离子磺酸盐功能化共价有机骨架 (COF)，称为 TpStb-SO ₃ Na， 2'-二磺酸 (Stb-SO ₃ H) 在乙酸钠存在下的溶剂热条件下。由于周期性一维通道中的致密磺酸盐基团，带负电荷的 TpStb-SO ₃ Na 显示出快速动力学（仅 10 分钟内平均吸收 99%）和对包括亚甲蓝（MB，MB， 1078毫克克^-1)、结晶紫 (CV, 1861 mg g ^-1 )、孔雀石绿 (MG, 5857 mg g ^-1 ) 和 janus 绿 B (JGB, 1339 mg g ^-1 )。_{值得注意的是，TpStb-SO 3} Na 对 CV、MG 和 JGB的吸附容量是已记录的 COF、金属有机骨架 (MOF) 和其他基准吸附剂中的历史最高值。此外，MB、CV、MG和JGB在TpStb-SO ₃ Na上的吸附行为符合准二级吸附动力学模型。相反，TpStb-SO ₃Na 对甲基橙 (MO) 和荧光素钠 (FS) 等阴离子染料的吸附能力较低，使其成为基于电荷差异分离阳离子和阴离子染料的有前途的吸附剂。此外，TpStb-SO ₃ Na 易于再生并重复使用五个循环，其吸附性能没有明显损失。这项工作揭示了阴离子 COF 在有效去除废水中有机染料污染物方面的巨大潜力。