Template‐free Formation of Uniform Urchin‐like α‐FeOOH Hollow Spheres with Superior Capability for Water Treatment

Abstract

Uniform urchin-like α-FeOOH hollow spheres assembled from nanoneedles have been synthesized via a facile and green one-pot method. By simply adjusting the amount of glycerol in the reaction system, hierarchical urchin-like α-FeOOH solid spheres or hollow spheres can be obtained. When evaluated for the potential use in water treatment, it is found that the as-obtained uniform urchin-like α-FeOOH hollow spheres exhibit excellent capability for removing both organic dye and heavy metal ions in waste water.

Extremely high arsenic removal capacity for mesoporous aluminium magnesium oxide composites

“…The adsorption isotherms of AsIJV) and AsIJIII) on the mesoporous composite adsorbents were obtained using a batch contact methodology in which the adsorbent powder was magnetically stirred in solutions of a dose of 0.5 g L −1 (a commonly used dose in previous works). 26,28,29,32,51 In a typical procedure to obtain the adsorption isotherm of AsIJV), 0.02 g adsorbent was suspended in 40 mL of AsIJV) solution in a screw-capped PP vessel with various initial concentrations ranging from 10 to 1000 mg L −1 . The initial pH of the AsIJV) solution was adjusted to 3.0 ± 0.1.…”

“…This is much higher than previously reported values for metal oxide adsorbents, such as activated alumina, 43 mesoporous alumina, 18 ceria hollow nanospheres, 33 flowerlike α-Fe 2 O 3 , 27 and urchin-like α-FeOOH hollow spheres. 28 The high adsorption capacity of meso-Al-400 is probably due to its highly ordered mesopores, high surface area and pore volume. By contrast, the control sample of Al-400 shows an adsorption capacity of merely 72 mg g −1 , because of its low BET surface area and pore volume.…”

Self‐Templated Synthesis of Ultrathin Nanosheets Constructed TiO2 Hollow Spheres with High Electrochemical Properties

“…Recent researches have demonstrated that hollow spheres constructed with 1D nanorods/nanoneedles18 and 2D nanosheets19, 20, 21, 22 even exhibit faster surface reaction rates and better physicochemical stability because they occupy much larger specific surface areas than the most hollow spheres composed of 0D nanoparticles,23 and simultaneously inherit the characteristics of the constituent units. However, synthesis of this kind of hierarchical hollow structures is generally challenging due to the difference of stability between core and shell materials 24, 25.…”

Carbon-decorated iron oxide hollow granules formed using a silk fibrous template: lithium-oxygen battery and wastewater treatment applications

“…[14][15][16][17] Large internal voids and doubled surface areas formed by well-ordered subunits of hollow structures could show enhanced performance of Li-O 2 batteries and water treatment. 18 Herein, we present the design of rice-grain-shaped hollow structures by using a silk fibrous template.…”