In this work,a novel nitrogen-doped biochar-supported nanoscale ferrous sulfide composite(nFeS@NBC)was fabricated by pyrolyzing corn straw pretreated with Mohr’s salt through a one-step carbothermic reduction process...In this work,a novel nitrogen-doped biochar-supported nanoscale ferrous sulfide composite(nFeS@NBC)was fabricated by pyrolyzing corn straw pretreated with Mohr’s salt through a one-step carbothermic reduction process,which was applied in the efficient disposal of hexavalent chromium(Cr(VI))-containing wastewater.The key effects of impregnation ratio and pyrolysis temperature on the properties and removal performance of nFeS@NBC for Cr(VI)were subsequently investigated.The properties of nFeS@NBC were characterized through a series of techniques.It indicated that FeS nanoparticles were successfully loaded and–NH2 functional groups effectively formed on the biochar surface,which enhanced the removal performance of nFeS@NBC for Cr(VI)from wastewater.The removal performance of nFeS@NBC for Cr(VI)was systemically evaluated at different experimental conditions and in the presence of major co-existing ions.Adsorption kinetics was best suited to the pseudo-second-order model.Additionally,Langmuir isotherms model could well explain the adsorption experiment data for the removal of Cr(VI)by nFeS@NBC with the highest adsorption capacity of 373.85 mg·g^(–1).According to the thermodyna-mic study,nFeS@NBC dominated the adsorption of Cr(VI)through an endothermic and spontaneous process.The adsorption and reduction served as the main removal mechanisms of nFeS@NBC for aqueous Cr(VI).nFeS@NBC could be used repetitively for its regeneration.Thus,the above results showed that it was feasible and efficient to remove Cr(VI)by nFeS@NBC,providing a potential green material for environmental remediation.展开更多
基金supported by the Shandong Province Young Taishan Scholar,China(Grant No.tsqn202312155)the National Natural Science Foundation of China(Grant No.42471081)+1 种基金the Shandong Provincial Natural Science Foundation(Grant No.ZR2021YQ22)the Shandong Province Colleges and Universities Youth Innovation Science and Technology Teams Support Program(Grant No.2021KJ015).
文摘In this work,a novel nitrogen-doped biochar-supported nanoscale ferrous sulfide composite(nFeS@NBC)was fabricated by pyrolyzing corn straw pretreated with Mohr’s salt through a one-step carbothermic reduction process,which was applied in the efficient disposal of hexavalent chromium(Cr(VI))-containing wastewater.The key effects of impregnation ratio and pyrolysis temperature on the properties and removal performance of nFeS@NBC for Cr(VI)were subsequently investigated.The properties of nFeS@NBC were characterized through a series of techniques.It indicated that FeS nanoparticles were successfully loaded and–NH2 functional groups effectively formed on the biochar surface,which enhanced the removal performance of nFeS@NBC for Cr(VI)from wastewater.The removal performance of nFeS@NBC for Cr(VI)was systemically evaluated at different experimental conditions and in the presence of major co-existing ions.Adsorption kinetics was best suited to the pseudo-second-order model.Additionally,Langmuir isotherms model could well explain the adsorption experiment data for the removal of Cr(VI)by nFeS@NBC with the highest adsorption capacity of 373.85 mg·g^(–1).According to the thermodyna-mic study,nFeS@NBC dominated the adsorption of Cr(VI)through an endothermic and spontaneous process.The adsorption and reduction served as the main removal mechanisms of nFeS@NBC for aqueous Cr(VI).nFeS@NBC could be used repetitively for its regeneration.Thus,the above results showed that it was feasible and efficient to remove Cr(VI)by nFeS@NBC,providing a potential green material for environmental remediation.
