A hierarchical hybrid monolith: MoS42--intercalated NiFe layered double hydroxide nanosheet arrays assembled on carbon foam for highly efficient heavy metal removal

被引:68
作者
Wang, Yongchuang [1 ,2 ]
Gu, Yue [1 ,2 ]
Xie, Donghua [1 ,2 ]
Qin, Wenxiu [1 ]
Zhang, Haimin [1 ]
Wang, Guozhong [1 ]
Zhang, Yunxia [1 ]
Zhao, Huijun [1 ,3 ]
机构
[1] Chinese Acad Sci, CAS Ctr Excellence Nanosci, Inst Solid State Phys,Ctr Environm & Energy Nanom, Anhui Key Lab Nanomat & Nanotechnol,Key Lab Mat P, Hefei 230031, Anhui, Peoples R China
[2] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[3] Griffith Univ, Ctr Clean Environm & Energy, Gold Coast Campus, Southport, Qld 4222, Australia
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
AQUEOUS-SOLUTION; SELECTIVE ADSORPTION; ORGANIC FRAMEWORKS; MERCURY; WATER; ION; SEQUESTRATION; INTERCALATION; COMPLEXES; BEHAVIOR;
D O I
10.1039/c9ta03102b
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Increasing exposure to heavy metals has stimulated extensive research for designing adsorbents with collective features of high removal efficiency and strong binding affinity to target ions as well as simple and facile separation. Herein, NiFe-layered double hydroxide (LDH) nanosheets have been homogeneously immobilized on a carbon foam (CF) substrate, followed by subsequent intercalation of MoS42- ions into the interlayers, giving rise to a hierarchical porous hybrid monolith (abbreviated as NiFe-MoS42--LDH/CF). By virtue of abundant binding sites, strong affinity and excellent pore accessibility, the developed NiFe-MoS42--LDH/CF hybrid monolith is found to be highly effective for the sequestration of Hg2+, Pb2+, and Cu2+, exhibiting ultrahigh sorption capacities of 462, 299, and 128 mg g(-1), respectively, and outperforms most of the reported sorbents. Meanwhile, the uptake kinetics of these metal ions are extremely fast, as reflected by >99% removal rates within 5 min. More significantly, the developed adsorbent possesses superior selectivity for the target heavy metals with high distribution coefficients in the presence of various interfering ions. Remarkably, the resulting NiFe-MoS42--LDH/CF hybrid monolith can be utilized as a flow-through filter unit and continuously treat larger volumes of simulated wastewater to below the permitted level for drinking water as compared to a NiFe-MoS42--LDH powder under identical dynamic conditions, highlighting its feasibility for practical water purification.
引用
收藏
页码:12869 / 12881
页数:13
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