biostudies-literatureMa FLanzhou Jiaotong UniversityGansu Science and Technology DepartmentNational Natural Science Foundation of China39217-39225https://www.ebi.ac.uk/biostudies/studies/S-EPMC9057329biostudies-literatureUnknown10(64)The purpose of this study was to investigate the removal mechanism of phosphate by rape straw biochar (RSBC) supported nanoscale zero-valent iron (nZVI). BET, TEM, FTIR and XPS characterizations of the composite material (nZVI-RSBC) indicated that nZVI was successfully supported on the RSBC, and nZVI-RSBC had a high specific surface area and abundant oxygen-containing functional groups. Batch experiments showed that the adsorption data could be fitted well with the Sips isotherm model and pseudo-second-order kinetic model, suggesting that phosphate adsorption onto RSBC and nZVI-RSBC was due to surface and chemical processes. The maximum adsorption capacities of RSBC and nZVI-RSBC for phosphate obtained by the Sips isotherm model fitting were 3.49 mg g^-1 and 12.14 mg g<sup>-1</suRSC advancesMechanism of phosphate removal from aqueous solutions by biochar supported nanoscale zero-valent iron.PMC905732918JR3RA129517660082146701321167007Jiang YDiao JZhao BZhang JMa FfalseMechanism of phosphate removal from aqueous solutions by biochar supported nanoscale zero-valent iron.The purpose of this study was to investigate the removal mechanism of phosphate by rape straw biochar (RSBC) supported nanoscale zero-valent iron (nZVI). BET, TEM, FTIR and XPS characterizations of the composite material (nZVI-RSBC) indicated that nZVI was successfully supported on the RSBC, and nZVI-RSBC had a high specific surface area and abundant oxygen-containing functional groups. Batch experiments showed that the adsorption data could be fitted well with the Sips isotherm model and pseudo-second-order kinetic model, suggesting that phosphate adsorption onto RSBC and nZVI-RSBC was due to surface and chemical processes. The maximum adsorption capacities of RSBC and nZVI-RSBC for phosphate obtained by the Sips isotherm model fitting were 3.49 mg g^-1 and 12.14 mg g<sup>-1</su2020-01-01T00:00:00Z2020 Oct2025-04-26T04:34:54.885Z2025-04-06T11:14:46.082ZS-EPMC90573293551841610.1039/d0ra07391a