Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 285, Issue -, Pages 173-181Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.11.034
Keywords
Diatomite; MFI-type zeolite; Composites; NaOH etching; Benzene adsorption
Categories
Funding
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2013BAC01B02]
- Natural Science Foundation of Guangdong Province, China [S2013030014241]
- National Natural Science Foundation of China [41202024]
- Science and Technology Program of Guangzhou, China
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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. (C) 2014 Elsevier B.V. All rights reserved.
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