Synthesis of Na-A and/or Na-X zeolite/porous carbon composites from carbonized rice husk

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.04.022· OSTI ID:21370478

Katsuki, Hiroaki ^[1]; Komarneni, Sridhar ^[2]

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1. Saga Ceramics Research Laboratory, 3037-7, Arita-machi, Saga 844-0022 (Japan)
2. Materials Research Institute and Department of Crop and Soil Sciences, 205 Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802 (United States)

Na-A and/or Na-X zeolite/porous carbon composites were prepared under hydrothermal conditions by NaOH dissolution of silica first from carbonized rice husk followed by addition of NaAlO{sub 2} and in situ crystallization of zeolites i.e., using a two-step process. When a one-step process was used, both Na-A and Na-X zeolites crystallized on the surface of carbon. Na-A or Na-X zeolite crystals were prepared on the porous carbonized rice husk at 90 deg. C for 2-6 h by changing the SiO{sub 2}/Al{sub 2}O{sub 3}, H{sub 2}O/Na{sub 2}O and Na{sub 2}O/SiO{sub 2} molar ratios of precursors in the two-step process. The surface area and NH{sub 4}{sup +}-cation exchange capacity (CEC) of Na-A zeolite/porous carbon were found to be 171 m{sup 2}/g and 506 meq/100 g, respectively, while those of Na-X zeolite/porous carbon composites were 676 m{sup 2}/g and 317 meq/100 g, respectively. Na-A and Na-X zeolites are well-known microporous and hydrophilic materials while carbonized rice husk was found to be mesoporous (pores of {approx}3.9 nm) and hydrophobic. These hybrid microporous-mesoporous and hydrophilic-hydrophobic composites are expected to be useful for decontamination of metal cations as well as organic contaminants simultaneously. - Graphical Abstract: Novel Na-X zeolite/porous carbon composite.

• OSTI ID: 21370478
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 7 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALKALI METAL COMPOUNDS
CARBON
CEREALS
CHALCOGENIDES
CRYSTALLIZATION
ELEMENTS
GRAMINEAE
HYDROTHERMAL SYNTHESIS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LILIOPSIDA
MAGNOLIOPHYTA
MATERIALS
MINERALS
NANOSTRUCTURES
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLANTS
POROUS MATERIALS
RICE
SILICA
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
ZEOLITES