Boron-based covalent organic polymers are extremely popular adsorbents owing to their good adsorption properties. It is important and challenging to immobilize adsorbents on a substrate platform for their further application. In this study, boroxine-linked COPs (B-COPs) containing carbon chains were synthesized and immobilized on a microcap following a one-step solvent-thermal reaction. We used (3-aminopropyl)triethoxysilane to stabilize and catalyze the formation of boroxine rings, which also anchored B-COPs to the microcaps. To evaluate its adsorption property, the B-COP coated microcap (B-COPs@microcap) was subjected to novel stir bar sorptive extraction (SBSE) for separating the active anthraquinones from the complex matrices. Furthermore, the suspended B-COPs@microcap eliminated the mechanical abrasion of the adsorbed phase during the SBSE process. Highly sensitive detection of rhein and emodin was achieved with a low limit of detection (0.006 ng mL⁻¹) by coupling the bar sorptive extraction (BSE) with ultra-performance liquid chromatography (UPLC). The B-COPs@microcap exhibited good reproducibility, selectivity, and recyclability.

中文翻译：

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含碳链的环硼氧烷聚合物的简便合成和固定化及其作为吸附剂的应用

硼基共价有机聚合物由于其良好的吸附性能而成为非常受欢迎的吸附剂。将吸附剂固定在基质平台上对于它们的进一步应用是重要且具有挑战性的。在这项研究中，合成了包含碳链的环硼氧烷连接的COP（B-COP），并将其固定在一步溶剂-热反应后的微囊上。我们使用了（3-氨基丙基）三乙氧基硅烷来稳定和催化环硼氧烷环的形成，环环也将B-COP锚定在微帽上。为了评估其吸附性能，对B-COP涂层微囊（B-COPs @ microcap）进行了新型搅拌棒吸附萃取（SBSE），以从复杂基质中分离出活性蒽醌。此外，悬浮的B-COPs @ microcap消除了SBSE过程中吸附相的机械磨损。大黄酸和大黄素的高灵敏度检测具有低检测限（0.006 ng mL^-1）通过将棒吸附萃取（BSE）与超高效液相色谱（UPLC）结合使用。B-COPs @ microcap具有良好的可重复性，选择性和可回收性。