title: Paraquat adsorption on porous materials synthesized from rice husk silica.
abstract: 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.
authors.affiliation: School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000 Thailand E-mail: jatuporn@sut.ac.th.
authors.forename: Wina
authors.initials: W
authors.lastname: Rongchapo
authors.forename: Onsulang
authors.initials: O
authors.lastname: Sophiphun
authors.forename: Kamolwan
authors.initials: K
authors.lastname: Rintramee
authors.forename: Sanchai
authors.initials: S
authors.lastname: Prayoonpokarach
authors.forename: Jatuporn
authors.initials: J
authors.lastname: Wittayakun
mesh_terms: D000327:Adsorption; D006540:Herbicides / Q000737:chemistry*; D015394:Molecular Structure; D012275:Oryza / Q000737:chemistry*; D010269:Paraquat / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006540:Herbicides; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; D010269:Paraquat