Paraquat adsorption on porous materials synthesized from rice husk silica

The goal of this work was to utilize rice husk silica (RHS) and porous materials synthesized with RHS, including mesoporous material (MCM-41) and microporous materials (zeolite NaY and NaBEA), for adsorption of herbicide paraquat. The adsorption occurred although cation exchange and the capacity dec...

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Bibliographic Details
Published in:Water science and technology 2013-01, Vol.68 (4), p.863-869
Main Authors: RONGCHAPO, Wina, ONSULANG SOPHIPHUN, RINTRAMEE, Kamolwan, PRAYOONPOKARACH, Sanchai, WITTAYAKUN, Jatuporn
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Applied sciences
Biopsy
Capacity
Cation exchange
Cation exchanging
Cations
Dyes
Exact sciences and technology
Herbicides
Herbicides - chemistry
Molecular Structure
Operating costs
Oryza
Oryza - chemistry
Oryza sativa
Paraquat
Paraquat - chemistry
Pollution
Porous materials
Production costs
Silica
Silicon dioxide
Silicon Dioxide - chemistry
Synthesis
Water Pollutants, Chemical - chemistry
Water treatment and pollution
Zeolites
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Summary:The goal of this work was to utilize rice husk silica (RHS) and porous materials synthesized with RHS, including mesoporous material (MCM-41) and microporous materials (zeolite NaY and NaBEA), for adsorption of herbicide paraquat. The adsorption occurred although cation exchange and the capacity decreased in the following order: NaY > NaBEA > MCM-41 > RHS, consistent with the amount of Al. The adsorption on all adsorbents fitted well with the Langmuir model and the maximum adsorption capacity of 185.2 mg/g-adsorbent was obtained on NaY. In addition, blue dye in commercial grade paraquat did not interfere with paraquat adsorption. Although MCM-41 was the most efficient adsorbent for the blue dye, RHS was favorable in terms of production cost. A mixture of NaY and RHS is recommended for simultaneous adsorption of paraquat and blue dye.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2013.311