“…Generally, the uranium removal rate by sorption is mainly influenced by physical/chemical properties of adsorbents (i.e., pore structure, surface groups), uranium concentration, pH, etc. ( Kataria and Garg, 2018 ) Biochar ( Sun et al, 2013 ; Sun et al, 2017 ; Kong et al, 2020 ), graphene ( Zhao et al, 2019 ), calixarene ( Fang-Zhu et al, 2019 ), MOFs ( Li et al, 2020 ), and mesoporous silicon ( Jiang et al, 2020 ) were used as sorption materials. Among them, biochar has been verified as an important sorption material for uranium recovery or removal from aqueous solution ( Jin et al, 2018 ; Li et al, 2019a ), due to its simple preparation process, lower price, higher temperature resistance, radiation resistance, higher stability to almost all kinds of acidic and alkali environments, nontoxic, and environmentally friendly nature ( Zhao et al, 2017 ; Pu et al, 2019 ).…”