Arsenite (AsO₂^–) is a toxic pollutant for the environment and very harmful to human health. Hence, highly selective and ultrasensitive detection of AsO₂^– is a very significant issue for a scientific researcher. Herein, an efficient approach for ultrasensitive detection of AsO₂^– (the lowest detection limit is 1.7 nM) was successfully developed by employing competition among lone pair−π and exo-wall π–π interactions in a bicomponent aggregation-induced emission (AIE) π–gel (ST-G) system. In addition, the xerogel powder of ST-G also could efficiently remove AsO₂^– from water. This work provides an ultrasensitive method for detection and removal of AsO₂^– in water.

中文翻译：

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外切墙π-π和孤对-π相互作用的竞争：一种可行的方式来实现超灵敏检测和ASO的有效去除₂ ^-水

砷（AsO ₂ ^–）对环境有毒，对人体健康非常有害。因此，高选择性和ASO的超灵敏检测₂ ^-是一个科研人员非常显著的问题。在此，对于ASO的超灵敏检测的有效方法₂ ^- （最低检测限为1.7纳米）成功通过采用双组分聚合诱导的发射孤对-π和外壁π-π相互作用之间的竞争（AIE）开发π-gel（ST-G）系统。此外，ST-G的干凝胶粉还可以有效去除AsO ₂ ^–从水。这项工作提供了用于检测和删除ASO的超灵敏方法₂ ^-在水中。