Insights into Promoted Adsorption Capability of Layered BiOCl Nanostructures Decorated with TiO2 Nanoparticles

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• 作者：Feifan Xu ; Gang Cheng ; Shuang Song ; Yi Wei ; Rong Chen
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：7013-7022
• 全文大小：709K
• ISSN：2168-0485

文摘

Rational design of excellent adsorbents with remarkable adsorption capability and renewable properties is of significant importance to practical applications. Herein, an adsorbent of BiOCl nanoplates decorated with TiO₂ nanoparticles was successfully prepared from porous BiOCl microspheres and tetrabutoxytitanium. Through TiO₂ nanoparticle decoration, the tuned morphology, surface charge property, Brunauer–Emmett–Teller (BET) surface area, and hydrophilic property of the BiOCl microsphere were favorable for achieving optimization of adsorption capability toward Congo red removal with a maximum adsorption amount of 254.7 mg/g. A possible adsorption mechanism model involving the BET surface area, electrostatic interactions, and competitive adsorption between solvent and solute was proposed to account for the enhancement of adsorption capability of BiOCl-TiO₂ nanocomposites compared to those of pure BiOCl and TiO₂. Furthermore, the BiOCl-TiO₂ nanocomposite adsorbent can be simply regenerated by a photocatalysis technique and efficiently reused for adsorption repeatedly. In addition, TiO₂ nanoparticle-based decoration could be a general strategy to boost the adsorption capacity of other Bi-based nanostructures, which is confirmed by Bi₂O₂CO₃-TiO₂, Bi₂S₃-TiO₂, Bi₂MoO₆-TiO₂, and Bi₂O₃-TiO₂ nanocomposites.