Development of ecofriendly and low‐cost highly efficient photocatalysis is of importance in the field of chemical synthesis. Currently, various metals‐based organic materials, metal oxide nanoparticles, and metal nanomaterials have been urbanized as light harvesting photocatalysts for direct carbon (C)‐hydrogen (H) arylation of aryl diazonium salts and heteroarenes. These light harvesting photocatalysts, however, still suffer from poor stability, reusability problem, high cost, or less selectivity. Herein, we report the fabrication of a novel chitosan‐based fluorescein isothiocyanate (CBFITC) film photocatalyst and demonstrate its tremendous photocatalytic activity, high yields (97 ± 0.015%), selectivity (99%), and reusability to catalyze the metal free solar‐light‐mediated direct CH arylation of aryl diazonium salts and heteroarenes at ambient temperature. Moreover, CBFITC film photocatalyst can be recycled more than five times without loss of activity, verifying this photocatalyst excellent light harvesting ability and stability. The present approach to fabricate a metal‐free film photocatalyst with the suitable band gap will be a new platform for efficient photocatalytic reaction and provide a new insight into the solar chemical synthesis.

中文翻译：

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基于壳聚糖的异硫氰酸荧光素薄膜可作为一种高效的无金属光催化剂，用于太阳光介导的直接C ？盐化

在化学合成领域，开发环保，低成本，高效的光催化技术非常重要。当前，各种金属基有机材料，金属氧化物纳米颗粒和金属纳米材料已作为一种用于芳基重氮盐和杂芳烃的直接碳（C）-氢（H）芳基化的光收集光催化剂而进行了城市化处理。但是，这些光收集光催化剂仍具有稳定性差，可重复使用性问题，成本高或选择性差的缺点。本文中，我们报道了一种新型的壳聚糖基异硫氰酸荧光素（CBFITC）薄膜光催化剂的制备，并证明了其巨大的光催化活性，高收率（97±0.015％），选择性（99％）和可重复使用性以催化无金属的太阳能-光介导的直接C在环境温度下芳基重氮盐和杂芳基的芳基化。此外，CBFITC薄膜光催化剂可以循环使用五次以上，而不会损失活性，证明该光催化剂具有出色的光收集能力和稳定性。目前制造具有合适带隙的无金属薄膜光催化剂的方法将成为有效进行光催化反应的新平台，并为太阳能化学合成提供新的见识。