Enhanced elimination of Cr(VI) from aqueous media by polyethyleneimine modified corn straw biochar supported sulfide nanoscale zero valent iron: Performance and mechanism

A novel polyethyleneimine modified corn straw biochar supported sulfide nanoscale zero-valent iron (S-nZVI@PBC) was developed to enhance Cr(VI) removal from aqueous media. The characteristics of morphology, chemical composition, and functional groups of S-nZVI@PBC, as well as its kinetics and mechanism for Cr(VI) removal were explored. Characterization verified S-nZVI was successfully loaded onto PEI modified biochar. The adsorption process was well represented pseudo-second-order model (R2 = 0.990) and Langmuir isotherm model (R2 = 0.962), indicating it was a monolayer chemical adsorption process. The Cr(VI) removal was affected by pH and achieved the maximum when pH = 3.0, which may be ascribed to the better corrosion of nZVI and release of Fe(II) from the S-nZVI@PBC in acidic condition. The primary mechanisms were adsorption, reduction, and co -precipitation. S-nZVI@PBC exhibited higher stability and reusability than nZVI, which makes it more prom-ising in environmental application. Overall, S-nZVI@PBC is of great potential for treating Cr(VI)-containing wastewater.

Automated summary

A novel polyethyleneimine modified corn straw biochar supported sulfide nanoscale zero-valent iron (S-nZVI@PBC) was developed to enhance the removal of Cr(VI) from aqueous media. The characteristics of S-nZVI@PBC and its mechanism for Cr(VI) removal were explored, and it was found that the adsorption process followed a pseudo-second-order model and Langmuir isotherm model. The primary mechanisms for Cr(VI) removal were adsorption, reduction, and co-precipitation. S-nZVI@PBC showed higher stability and reusability compared to nZVI, making it a promising tool for treating Cr(VI)-containing wastewater.