磁铁矿
光催化
打赌理论
赤铁矿
比表面积
化学工程
氧化铁
材料科学
氧化物
辐照
亚甲蓝
惰性气体
相(物质)
吸附
化学
催化作用
冶金
有机化学
复合材料
物理
工程类
核物理学
作者
Soon Chang Lee,Youn‐Joong Jeong,Youn‐Jung Kim,Hye‐Ran Kim,Hyun Uk Lee,Young‐Chul Lee,Sang Moon Lee,Hae Jin Kim,Ha‐Rim An,Myoung Gyu Ha,Go-Woon Lee,Young‐Seak Lee,Gaehang Lee
标识
DOI:10.1016/j.jhazmat.2018.04.048
摘要
In this study, hierarchically three-dimensional (3D) nanotubular sea urchin-shaped iron oxide nanostructures (3D-Fe2O3) were synthesized by a facile and rapid ultrasound irradiation method. Additives, templates, inert gas atmosphere, pH regulation, and other complicated procedures were not required. Dense 3D-Fe2O3 with a relatively large Brunauer–Emmett–Teller (BET) surface area of 129.4 m2/g was synthesized within 23 min, and the BET surface area was further improved to 282.7 m2/g by a post heat-treatment process. In addition, this post processing led to phase changes from maghemite (γ phase) to hematite (α phase) Fe2O3. Subsequent characterization suggested that the growth mechanism of the 3D-Fe2O3 follows self-assembly and oriented attachment. The prepared 3D-Fe2O3 was applied to wastewater purification. Ultrasound-irradiated 3D-Fe2O3 can eliminate a As(V) and Cr(VI) from water with 25 times faster removal rate by using a one third smaller amount than commercial α-Fe2O3. This was attributed to the inter-particle pores and relatively positively charged surface of the nanostructure. In addition, post heat treatment on ultrasound-irradiated 3D-Fe2O3 significantly influenced the photocatalytic degradation of methylene blue and phenol, with a 25 times higher removal efficiency than that of commercial α-Fe2O3, because of both high BET surface area and good crystallization of the prepared samples.
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