Facile Microwave Synthesis of 3D Flowerlike BiOBr Nanostructures and Their Excellent Cr^VI Removal Capacity

Abstract

A facile and fast microwave irradiation method has been developed to synthesize uniform well‐defined 3D flowerlike BiOBr nanostructures through a self‐assembly process. Cetyltrimethylammonium bromide (CTAB), which acts as both the bromide source and soft template, plays a critical role in the formation of 3D flowerlike BiOBr nanostructures. Different flowerlike BiOBr nanostructures could be obtained by varying the CTAB concentration. A possible formation process is discussed. The as‐prepared flowerlike BiOBr nanostructures possessed a large surface area and exhibited an excellent removal capacity and fast adsorption rate for CrVI ions in a wide pH range.

Pseudo-Janus Zn/Al-based nanocomposites for Cr(VI) sorption/remediation and evolved photocatalytic functionality

“…The total adsorption amount is as high as 98% when the initial concentration of Cr(VI) is 45.248 mg/L. The adsorption capacity increases with increasing initial Cr(VI) concentration, while the maximum adsorption capacity (q e ) is 52.45 mg/g, a figure much higher than results previously reported [21]. Even when the Zn/Al-LDO-500 was used to adsorb Cr(VI) from Cr(VI)-containing electroplating wastewater that also contains considerable amount of Zn(II), Ni(II) and Cu(II), as shown in Fig.…”

“…The maximum adsorption capacity (q e ) is reduced to 20.1 mg/g. Although this value is still rather high compared to the adsorption capacity of most reported inorganic adsorbent [8,[21][22][23], it is predicted that the adsorption capacity of the regenerated Zn/Al-LDH-based adsorbent would irreversibly and quickly deteriorate with an increase in regeneration cycle times until complete loss of its adsorption. The question of secondary treatment of Cr(VI) prompted the subsequent studies presented.…”

BiOX (X=Cl, Br, I) nanostructures: Mannitol-mediated microwave synthesis, visible light photocatalytic performance, and Cr(VI) removal capacity

“…BiOX has been viewed as a new kind of novel photocatalysts for NO oxidation, organic pollutants degradation, and sterilization [18][19][20][21][22][23]. Apart from this, BiOX nanostructures also demonstrate effective removal capacity for heavy metal ions and organic dyes [24,25]. Until now, different BiOX micro/nanostructures have been successfully synthesized by utilizing hydro-/solvothermal [18,26], chemical vapor transport [27], reverse microemulsions [28], and sonochemical methods [29], which usually involved extremely high temperature, long reaction time, sharp thermal gradients, and hard-control process.…”

Facet-dependent performance of BiOBr for photocatalytic reduction of Cr(vi)

“…2 Li synthesized 3D owerlike BiOBr nanostructures with an excellent removal capacity and fast adsorption rate for Cr(VI). 3 Lin obtained BiOBr nanocrystals with {001} and {010} dominant facets by hydrothermal method for degrading 2,4-dichlorophenol under UV light. 4 Zhang prepared nanosheets dominated with {102} as well as with {001} facets and compared their catalytic performance for the degradation of rhodamine B (RhB) under visible light irradiation.…”