Removal of chromium(Cr)and antimony(Sb)from aquatic environments is crucial due to their bioaccumulation,high mobility and strong toxicity.In this work,a composite adsorbent consisting of Ti(OH)n(4–n)+and polyaniline...Removal of chromium(Cr)and antimony(Sb)from aquatic environments is crucial due to their bioaccumulation,high mobility and strong toxicity.In this work,a composite adsorbent consisting of Ti(OH)n(4–n)+and polyaniline(PANI)was designed and successfully synthesized by a simple and eco-friendly method for the uptake of Cr(VI)and Sb(V).The synthetic PANI/TiO_(2)composites exhibited excellent adsorption capacities for Cr(VI)and Sb(V)(394.43 mg/g for Cr(VI)and 48.54 mg/g for Sb(V)),wide pH applicability and remarkable reusability.The adsorption of Cr(VI)oxyanions mainly involved electrostatic attraction,hydrogen bonding and anion-πinteractions.Based on X-ray photoelectron spectroscopy and FT-IR analysis,the adsorption sites were shown to be hydroxyl groups,amino/imino groups and benzene rings.Sb(V)was adsorbed mainly through hydrogen bonds and surface complexation to form Ti-O-Sb complexes.The formation of Cr-O-Sb in the dual system demonstrated the synergistic adsorption of Cr(VI)and Sb(V).More importantly,because of the different adsorption sites,the adsorption of Cr(VI)and Sb(V)occurred independently and was enhanced to some extent in the dual system.The results suggested that PANI/TiO_(2)is a promising prospect for practical wastewater treatment in the removal of Cr(VI)and Sb(V)from wastewater owing to its availability,wide applicability and great reusability.展开更多
基金We gratefully acknowledge the National Natural Science Foundation of China(Grant Nos.51978569,22008188,and 52070155)Key R&D projects of Shaanxi Province(China)(Nos.2018KW-036,2020SF-413,and 2020SF-421).
文摘Removal of chromium(Cr)and antimony(Sb)from aquatic environments is crucial due to their bioaccumulation,high mobility and strong toxicity.In this work,a composite adsorbent consisting of Ti(OH)n(4–n)+and polyaniline(PANI)was designed and successfully synthesized by a simple and eco-friendly method for the uptake of Cr(VI)and Sb(V).The synthetic PANI/TiO_(2)composites exhibited excellent adsorption capacities for Cr(VI)and Sb(V)(394.43 mg/g for Cr(VI)and 48.54 mg/g for Sb(V)),wide pH applicability and remarkable reusability.The adsorption of Cr(VI)oxyanions mainly involved electrostatic attraction,hydrogen bonding and anion-πinteractions.Based on X-ray photoelectron spectroscopy and FT-IR analysis,the adsorption sites were shown to be hydroxyl groups,amino/imino groups and benzene rings.Sb(V)was adsorbed mainly through hydrogen bonds and surface complexation to form Ti-O-Sb complexes.The formation of Cr-O-Sb in the dual system demonstrated the synergistic adsorption of Cr(VI)and Sb(V).More importantly,because of the different adsorption sites,the adsorption of Cr(VI)and Sb(V)occurred independently and was enhanced to some extent in the dual system.The results suggested that PANI/TiO_(2)is a promising prospect for practical wastewater treatment in the removal of Cr(VI)and Sb(V)from wastewater owing to its availability,wide applicability and great reusability.
