Recent advances in green synthesis of porous organic frameworks

Recently, porous organic frameworks (POFs) have emerged as functional materials and have been widely used in various applications. Crystalline POFs include covalent organic frameworks (COFs) and partial crystalline covalent triazine frameworks (CTFs). Amorphous porous organic materials are mainly divided into porous aromatic frameworks (PAFs), conjugated microporous polymers (CMPs), and hypercrosslinked porous polymers (HCPs). Although POFs have many unique structural features and excellent performance, the harsh synthesis conditions and difficulty in large-scale production have always limited their widespread use. Therefore, more researchers are paying attention to developing green, energy-saving, and environmentally friendly synthesis processes for large-scale preparation of POFs. Herein, we provide a timely overview on green synthesis of POFs and critically discuss some typical research work in detail. Meanwhile, the green synthesis strategies of POFs are emphatically described to categorize relevant reports. Finally, the challenges and opportunities of green synthetic POFs in the future are proposed according to the above classification research.