Activation of spent coffee ground for the removal of glyphosate in aqueous solutionTuan-Anh Nguyen, Thao-Nhien Pham, Nguyen Khanh Truc Le and Minh-Huong TranE3S Web of Conf., 405 (2023) 01002DOI: https://doi.org/10.1051/e3sconf/202340501002