The adsorption and reduction of anionic Cr(VI) in groundwater by novel iron carbide loaded on N-doped carbon nanotubes: Effects of Fe-confinement

被引:41
作者
Liu, Kunyuan [1 ]
Zhao, Dongye [2 ]
Hu, Zhuofeng [1 ,3 ]
Xiao, Ye [1 ,3 ]
He, Chi [4 ]
Jiang, Feng [1 ,3 ]
Zhao, Nan [1 ,3 ]
Zhao, Chuanfang [5 ]
Zhang, Weixian [6 ,7 ]
Qiu, Rongliang [1 ,6 ]
机构
[1] Sun Yat sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Peoples R China
[2] Auburn Univ, Dept Civil & Environm Engn, Auburn, AL 36849 USA
[3] Sun Yat sen Univ, Guangdong Prov Key Lab Environm Pollut Control & R, Guangzhou 510275, Peoples R China
[4] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
[5] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
[6] South China Agr Univ, Coll Nat Resources & Environm, Guangdong Lab Lingnan Modern Agr, Guangdong Prov Key Lab Agr & Pural Pollut Abatemen, Guangzhou 510642, Peoples R China
[7] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200090, Peoples R China
基金
中国国家自然科学基金;
关键词
Confined iron; Confinement effect; Carbon nanotube; Cr(VI) removal; Reductive immobilization; REMOVAL; CHROMIUM; WATER; IONS;
D O I
10.1016/j.cej.2022.139357
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Confining reactive nanoparticles (e.g., zero-valent iron) in nano-capsules prevents their aggregation and preserves their reactivity. However, confined Fe-based materials are ineffective in removing anionic contaminants, and the mechanisms are unclear. In this study, at different pyrolysis temperatures, novel iron carbide (Fe3C) loaded N-doped carbon nanotubes (MU-CNTs/Fe) were prepared, in which Fe was loaded onto CNTs as unconfined Fe prepared at 700 degrees C (U7) or confined Fe prepared at 800-900 degrees C (U8 and U9, respectively). When tested for their ability to remove Cr(VI) oxyanions, unconfined Fe showed higher adsorption, reduction, and reusability than confined Fe. Moreover, the selective adsorption of Cr(VI) using U7 was demonstrated in a binary solution system with coexisting anions and complicated groundwater. The key mechanism of the enhanced Cr (VI) removal by unconfined Fe was its considerably enhanced reductive precipitation mediated by surface adsorbed and dissolved Fe2+, accounting for 40.8 % of the overall Cr(VI) removal. This study proposes a novel strategy for modulating the transformation of nonconfinement to confinement of nanoparticles based on the pyrolysis temperature and provides new insights into the mechanisms of iron confinement on the removal of metal oxyanions from groundwater.
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页数:13
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