| Title: | Facile preparation of hierarchically porous diatomite/MFI-type zeolite composites and their performance of benzene adsorption: the effects of NaOH etching pretreatment |
| Author(s): | Yu W; Yuan P; Liu D; Deng L; Yuan W; Tao B; Cheng H; Chen F; |
| Address: | "CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China. Electronic address: yuanpeng@gig.ac.cn. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Wushan, Guangzhou 510640, China. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China" |
| DOI: | 10.1016/j.jhazmat.2014.11.034 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Hierarchically porous diatomite/MFI-type zeolite (Dt/Z) composites with excellent benzene adsorption performance were prepared. The hierarchical porosity was generated from the microporous zeolite coated at the surface of diatom frustules and from the macroporous diatomite support. A facile NaOH etching method was employed for the first time to treat the frustule support, followed by hydrothermal growth of MFI-type zeolite at the surface of frustules previously seeded with nanocrystalline silicalite-1 (Sil-1). NaOH etching enlarged the pores on diatom frustules and further increased the coated zeolite contents (W(z)). The central macropore size of the diatom frustules increased from approximately 200-500 nm to 400-1000 nm after NaOH etching. The W(z) could reach 61.2%, while the macroporosity of the composites was largely preserved due to more voids for zeolite coating being formed by NaOH etching. The Dt/Z composites exhibited higher benzene adsorption capacity per unit mass of zeolite and less mass transfer resistance than Sil-1, evaluated via a method of breakthrough curves. These results demonstrate that etching of a diatomite support is a facile but crucial process for the preparation of Dt/Z composites, enabling the resulting composites to become promising candidates for uses in volatile organic compounds emission control" |
| Keywords: | "Adsorption Air Pollutants/*chemistry Benzene/*chemistry Diatomaceous Earth/*chemistry Magnetic Resonance Spectroscopy Microscopy, Electron, Scanning Microscopy, Electron, Transmission Sodium Hydroxide/*chemistry X-Ray Diffraction Zeolites/*chemistry Benze;" |
| Notes: | "MedlineYu, Wenbin Yuan, Peng Liu, Dong Deng, Liangliang Yuan, Weiwei Tao, Bo Cheng, Hefa Chen, Fanrong eng Research Support, Non-U.S. Gov't Netherlands 2014/12/17 J Hazard Mater. 2015 Mar 21; 285:173-81. doi: 10.1016/j.jhazmat.2014.11.034. Epub 2014 Nov 25" |
