Two-step ball milling-assisted synthesis of N-doped biochar loaded with ferrous sulfide for enhanced adsorptive removal of Cr(Ⅵ) and tetracycline from water.
Two-step ball milling-assisted synthesis of N-doped biochar loaded with ferrous sulfide for enhanced adsorptive removal of Cr(Ⅵ) and tetracycline from water.
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DOI：
10.1016/j.envpol.2022.119398
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发表时间：
2022-05
影响因子：
8.9
通讯作者：
Jianhua Qu;Weihang Zhang;Fuxuan Bi;Shaojuan Yan;Xu Miao;Bo Zhang;Yifan Wang;Chengjun Ge;Ying Zhang
中科院分区：
文献类型：
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作者：
Jianhua Qu;Weihang Zhang;Fuxuan Bi;Shaojuan Yan;Xu Miao;Bo Zhang;Yifan Wang;Chengjun Ge;Ying Zhang
采用两步球磨法制备了负载FeS的氮掺杂生物炭（FeS@NBCBM）。表征结果表明，N掺杂过程成功地引入了吡啶、吡咯和石墨结构的N，并将FeS嵌入到N掺杂的生物炭（NBCBM）中。FeS@ NBCBM对Cr（VI）和四环素（TC）的吸附量分别为194.69 mg/g和371.29 mg/g，而BC和NBCBM的吸附量分别为27.28和37.89 mg/g和71.26和81.26 mg/g。此外，FeS@ NBCBM对Cr（VI）/TC的吸附过程基本稳定，且存在多种共存离子，经过3次解吸-再生循环后，吸附性能略有下降。最重要的是，FeS@ NBCBM不仅通过静电吸引、离子交换和络合作用，还通过N、Fe ~（2+）和S（Ⅱ）的电子触发还原作用来实现对Cr（Ⅵ）的去除。同时，孔隙填充，氢键和π-π堆积相互作用被证明有助于TC吸附。这些结果表明，通过球磨对生物炭进行N掺杂和FeS负载的共改性，可以作为生物炭吸附净化Cr（VI）和TC污染水的一种创新修饰方法。
Nitrogen-doped biochar loaded with FeS (FeS@NBCBM) was synthesized by two-step ball milling processes. Characterization results revealed that N-doping process successfully introduced pyridinic, pyrrolic, and graphitic N structures, and FeS was subsequently embedded in N-doped biochar (NBCBM). The resultant FeS@NBCBMpresented predominant adsorption capacity for Cr(VI) (194.69 mg/g) and tetracycline (TC, 371.29 mg/g) compared with BC (27.28 and 37.89 mg/g) and NBCBM(71.26 and 81.26 mg/g). In addition, the Cr(VI)/TC elimination process by FeS@NBCBMwas basically stable with multiple co-existing ions with slight decrease on adsorption performance after three desorption-regeneration cycles. Most importantly, FeS@NBCBMwas found to achieve Cr(VI) elimination not only by electrostatic attraction, ion exchange and complexation, but also by electrons-triggered reduction provided by different species of N, Fe2+as well as S(Ⅱ). Meantime, pore filling, hydrogen bonding, and π-π stacking interactions were demonstrated to contribute to TC adsorption. These results suggested the co-modification of N-doping and FeS loading by ball milling as an innovative decorating method for biochar to adsorptive purification of Cr(VI) and TC-contaminated water.