Biochar-embedding iron-alginate microspheres derived from bagasse by one-step microwave pyrolysis/activation for enhanced Cr(VI) removal

In this paper, two types of adsorption materials SA-C-Fe and SA-C-Fe(C) were prepared using bagasse biochar produced by one-step microwave pyrolysis activation for Cr(VI) removal wastewater. The characterized, performance, kinetics thermodynamics on studied. Results show that pyrolysis/activation contributes to developed pore structure abundant active functional groups, resulting in high capacities. optimal preparation conditions is: power 500 W, ZnCl 2 /bagasse ratio 2.5:1 time 15 min, the specific surface area is 1,787.64 m /g. more line with pseudo-second-order kinetic model, process dominated chemical adsorption. static experiment has best effect at pH = 2, whole Langmuir-Freundlich isotherm model. Calculated pseudo-two-order model isothermal maximum rate are 211.87 mg/g 388.92 mg/g, respectively. mainly three mechanisms: electrostatic adsorption, ion exchange redox reactions. improvement capacity attributed structure. results offer beneficial reference application low-cost carbon-based pollutants separation, effectively realize utilization by-products.