掺杂氮、硫的石墨烯材料对磺胺类抗生素的吸附行为

水环境中抗生素污染日益严重。本研究制备了掺杂氮、硫的新型石墨烯材料(GO-NS),研究了其对磺胺类抗生素(Sulfonamides,SAs)的吸附和去除能力,并阐明吸附机制。研究发现,GO-NS对SAs的最大吸附量达100.26 mg·g^-1,吸附能力优于多层石墨烯(Multilayer graphene,MG)和还原氧化石墨烯(Reduced graphene oxide,rGO)这两种传统石墨烯材料。疏水作用和氢键作用是GO-NS吸附SAs的主要机理。相比于MG和rGO,GO-NS适用的pH范围最广,在pH=2~10范围内均具有较强的吸附效果,并且离子强度和腐殖酸(Humicacid,HA)的加入提升了GO-NS的吸附性能。此外,GO-NS仅通过短时间超声可实现有效的剥离分散,使吸附量增加。故该新型石墨烯材料GO-NS具有优越地吸附SAs的能力和广泛的环境适应性,可作为治理水环境中SAs污染的一种有效吸附剂。

Adsorption of Sulfanilamide Antibiotics by Graphene-Based Material Doped with Nitrogen and Sulfur

The contamination of antibiotics in aqueous environment is increasingly severe.This work prepared a new graphene-based material doped with nitrogen and sulfur(GO-NS),investigated the adsorption and removal of sulfanilamide antibiotics(SAs)from water,and revealed its adsorption mechanism.It is observed that the adsorption capacity of SAs by GO-NS was as high as 100.26 mg·g^-1,and the adsorption capacity of GO-NS was higher than multilayer graphene(MG),and reduced graphene oxide(rGO).Our results demonstrated that hydrophobic interaction and hydrogen bonding played major roles in SAs adsorption on GO-NS.Compared with MG and rGO,GO-NS had the widest applicable pH range,and showed strong adsorption at pH=2~10.Moreover,ionic strengthand the presence of humic acid(HA)enhanced the adsorption of SAs on GO-NS.In addition,GO-NS could be effectively dispersed by short-time sonication,which obviously increased SA adsorption.Therefore,this new graphene-based material GO-NS hadexcellent adsorption ability to remove SAs and extensive environmental adaptability,which could be used as an effective adsorbent for the treatment of SAs in water environment.