Role of Point of Zero Charge in the Adsorption of Cationic Textile Dye on Standard Biochars from Aqueous Solutions: Selection Criteria and Performance Assessment

The point of zero charge (PZC) is an inherent electrokinetic property biochars (BC). It influences the adsorption process under certain pH conditions. Herein, we report method determination PZC values ten standard BCs. We used salt addition to select BCs with suitable properties for methylene blue (MB) removal from aqueous solutions. were obtained by pyrolyzing five different biomasses at two distinct temperatures (550°C and 700°C). derived rice husk (pHPZC 7.22 7.64 RH550 RH700, respectively) softwood pellets 6.57 6.78 SWP500 SWP700, selected their compatibility cationic dyes such as MB. Results experiments indicated potential use RH biochar adsorbent MB efficiencies 68.83% 71.97% respectively. Considerably low SWP550 SWP700 (21.61% 22.84%, respectively). Equilibrium was achieved 2 h 1 kinetics could be described a pseudo-second order equation. results revealed that even when produced comparable conditions, feedstocks exhibited dye removing abilities. optimized or anionic can easily engineered appropriately matching feedstock processing