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Advanced nanonetwork-structured carbon materials for high-performance formaldehyde capture

Zhang, Weicai, Chen, Lidong, Xu, Linhe, Dong, Hanwu, Hu, Hang, Xiao, Yong, Zheng, Mingtao, Liu, Yingliang, Liang, Yeru
Journal of colloid and interface science 2019 v.537 pp. 562-568
activated carbon, adsorbents, adsorption, air, carbonization, formaldehyde, hulls, nanospheres, pollution, polytetrafluoroethylene, porous media, wheat
Facile design and construction of advanced materials for eliminating the indoor formaldehyde pollution is still a great challenge but very desirable to provide clean air for human life. Herein, we report a high-performance formaldehyde adsorbent, i.e., a new type of nanonetwork-structured carbon (NNSC) with a hollow nanosphere as network unit by developing a facile, efficient and post-treatment-free strategy. The NNSCs can be easily obtained by a simple carbonization of a mixture, in which natural wheat husk and Teflon are used as carbon precursor and biotemplate-in-situ-remover, respectively. The as-constructed NNSC exhibits a unique three-dimensional interconnected micro-, meso- and macroporous nanonetwork. Benefiting from such a valuable hollow nanosphere-interconnected network structure, the NNSCs show surprising formaldehyde gas adsorption properties including super-high storage capacity, ultrafast adsorption rate and efficient adsorptively active surface. Remarkably, their specific adsorption capacity and maximum adsorption rate are as high as 120.3 mg g−1 m−3 and 44.6 mg g−1 m−3 h−1, which make 18-fold and 41-fold enhancement when compared to activated carbon commercially used for formaldehyde adsorption, respectively. This work highlights an efficient solution to develop high-performance formaldehyde adsorbents by facile and rational construction of novel porous structure, simultaneously to provide a new avenue to high-value advanced materials for challenging environmental issue.