Study on the Roles of Water in Solid Amine-Based Direct Air Capture of CO2 Chenglong Hou, Jiaying Chen, Zhenya Lai, Kang Zhang, Hongkun Lv and Liwei Ding E3S Web of Conf., 406 (2023) 02042 Published online: 31 July 2023 DOI: 10.1051/e3sconf/202340602042