Adsorption and Photo-catalytic Properties of Congo Red by Cobalt Doped Porous ZnO Prepared Through Hydrothermal MethodWenya Bao, Xiaofen Fu, Kaiqi Hu and Yecong ZhaoE3S Web Conf., 185 (2020) 04048DOI: https://doi.org/10.1051/e3sconf/202018504048