Vertically aligned γ-AlOOH nanosheets on Al foils as flexible and reusable substrates for NH3 adsorption
Chen Yang , Ying Chen , Dan Liu , Jinfeng Wang , Cheng Chen , Jiemin Wang , Ye Fan , Shaoming Huang , Weiwei Lei
Front. Phys. ›› 2018, Vol. 13 ›› Issue (4) : 138101
Vertically aligned γ-AlOOH nanosheets on Al foils as flexible and reusable substrates for NH3 adsorption
Vertically aligned γ-AlOOH nanosheets (NSs) have been successfully fabricated on flexible Al foils via a solvothermal route without morphology-directing agents. Three different reaction temperature (25, 80, and 120 ◦C) and time (30 min, 45 min, and 24 h) are discussed for the growth period, which efficiently tune the density and size of the γ-AlOOH NSs. Meanwhile, the growth speed of the nanosheets confirms that dominant growth stage is seen in the initial 45 min. Furthermore, the interlayer of the γ-AlOOH NSs displays an average height of 140 nm and superhydrophilicity. By dynamic adsorption, the assynthesized γ-AlOOH NSs exhibit an outstanding NH3 adsorption capacity of up to 146 mg/g and stably excellent regeneration for 5 cycles. The mechanism of NH3 adsorption on the in-plane of the γ-AlOOH NSs is explained by the Lewis acid/base theory. The H-bond interactions among the NH3 molecules and the edge groups (-OH) further improve the capture ability of the nanosheets.
γ-AlOOH nanosheets / NH 3 adsorption / Lewis acid/base theory / H bonds interaction
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Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature
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