Synthesis of carbon dots-assisted MgAl-LDH hollow microspheres with hierarchical structure for the effective removal of Congo red from wastewaterZhigang Jia, Cong Han, Rui Chang and Daqing ZhangE3S Web Conf., 269 (2021) 02003DOI: https://doi.org/10.1051/e3sconf/202126902003