Hierarchical porous BiOI architectures: Facile microwave nonaqueous synthesis, characterization and application in the removal of Congo red from aqueous solution

被引:72
作者
Ai, Lunhong [1 ,2 ]
Zeng, Ying [1 ]
Jiang, Jing [2 ]
机构
[1] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Peoples R China
[2] China West Normal Univ, Coll Chem & Chem Engn, Chem Synth & Pollut Control Key Lab Sichuan Prov, Nanchong 637002, Peoples R China
基金
中国国家自然科学基金;
关键词
Bismuth oxyiodide; Adsorption; Congo red; Environmental remediation; WATER-TREATMENT; PHOTOCATALYTIC ACTIVITY; SOLVOTHERMAL SYNTHESIS; IONOTHERMAL SYNTHESIS; ORGANIC-DYE; MICROSPHERES; ADSORPTION; PERFORMANCE; NANOSTRUCTURES; POLLUTANTS;
D O I
10.1016/j.cej.2013.09.046
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Three-dimensional (3D) hierarchical porous architectures have become promising candidates for adsorption-based environmental remediation in recent years. However, such type of adsorbents often suffers from the complicated production and undesirable regeneration, limiting their practical environmental application greatly. In this contribution, a novel adsorbent based on hierarchical porous bismuth oxyiodide (BiOI) architectures combining the highly effective adsorption and green photocatalytic regeneration were designed and fabricated by a facile and rapid microwave nonaqueous route. The resultant samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption measurements, and UV-vis diffuse reflectance spectroscopy (DRS). The BiOI architectures displayed remarkable performance towards removal of Congo red (CR) from aqueous solution, showing a maximum adsorption capacity reached up to 216.8 mg g(-1). The kinetics and equilibrium of adsorption process were found to follow the pseudo-second-order kinetic and Freundlich isotherm models, respectively. More importantly, the BiOI architectures were not only easy to separate from the reaction system because of the hierarchical structure and large sizes, but also attractive to photocatalytic regeneration due to their intrinsically prominent photoresponse in visible light region. By means of providing the facile preparation, high adsorption efficiency, easy solid-liquid separation, and economical photocatalytic regeneration, the synthesized BiOI architectures established an outstanding example for the design of multifunctionalized adsorbent with high performance for environmental remediation (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:331 / 339
页数:9
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