Journal
NANO RESEARCH
Volume 10, Issue 10, Pages 3543-3556Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1565-8
Keywords
NH2-MIL-68(In); multiwalled carbon nanotube (MWCNT); photocatalytic reduction; Cr(VI)
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Funding
- Guangdong Natural Science Funds for Distinguished Young Scholar [2016A030306031]
- National Natural Science Foundation of China [21576093]
- Guangdong Program for Support of Top-notch Young Professionals [2015TQ01N327]
- Pearl River and S&T Nova Program of Guangzhou [201610010039]
- Fundamental Research Funds for the Central Universities
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Efficient separation and transfer of photogenerated electron/hole as well as enhanced visible light absorption play essential roles in photocatalytic reactions. To promote the photocatalytic reduction of Cr(VI), a toxic heavy metal ion, multiwalled carbon nanotube (MWCNT) was introduced as an electron acceptor into NH2-MIL-68(In). This led to the growth of a willow leaf-like metal-organic framework (MOF) on an MWCNT backbone forming MWCNT/NH2-MIL-68(In) (PL-1), which showed a highly efficient transfer of photogenerated carriers. Moreover, MWCNT incorporation introduced more mesopores for Cr(VI) diffusion and enhanced the visible light adsorption without lowering the conduction band position. As a result, the photocatalytic kinetic constant of PL-1 was found to be almost three times higher than that of the parent NH2-MIL-68(In). Thus, growing MOFs on MWCNTs provides a facile and promising solution for effective remediation of environmental pollution by utilizing solar energy. This work provides the first example of using MWCNT/MOF composites for photocatalytic reactions.
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