“…In recent years, biomass-based adsorbents have attracted significant attention as a way to remove Cr(VI) from aqueous solution due to their environmental friendliness, renewability, and biodegradability, such as cellulose ( Liang et al, 2020 ), lignin ( Shi et al, 2020 ), starch ( Mohamed and Mahmoud, 2020 ), and chitosan ( Khalil et al, 2020 ). Cellulose is the most abundant natural polymer on earth and has excellent mechanical and chemical stability properties ( An et al, 2019 ; Liu et al, 2020a ; Liu H. et al, 2021 ; Liu K. et al, 2021 ). Additionally, cellulose with different sizes and microconformation can be used to produce microcrystalline cellulose, cellulose nanofibrils, and cellulose nanocrystals ( Lu et al, 2019 ; Huang et al, 2020 ; Liu et al, 2020b ; Wang H. et al, 2020 ; Xu et al, 2021 ).…”