title: Removal of aniline and phenol from water using raw and aluminum hydroxide-modified diatomite.
abstract: The feasibility of using raw diatomite and aluminum hydroxide-modified diatomite (Al-diatomite) for removal of aniline and phenol from water was investigated. Their physicochemical characteristics such as pHsolution, point of zero charge (pHPZC), surface area, Fourier transform infrared (FT-IR) and scanning electron microscopy was determined. After the raw diatomite was modified, the surface area of Al-diatomite increases from 26.67 to 82.65 m(2) g(-1). The pHPZC and pHsolution (10%) occurred around pH 5.2 and pH 8.6, respectively. The removal rates of aniline and phenol on diatomite and Al-diatomite decreased with increasing solution pH, while surface charge density decreased. The adsorption of aniline and phenol on diatomite presented a good fit to the Langmuir and Freundlich models, but the models are not fit to forecast the adsorption of aniline and phenol on Al-diatomite. The study indicated that electrostatic interaction was a dominating mechanism of aniline and phenol sorption onto Al-diatomite.
authors.affiliation: School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China. ppchdwu@scut.edu.cn
authors.forename: C D
authors.initials: CD
authors.lastname: Wu
authors.forename: J Y
authors.initials: JY
authors.lastname: Zhang
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: M H
authors.initials: MH
authors.lastname: He
mesh_terms: D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D000814:Aniline Compounds / Q000302:isolation & purification*; D007692:Diatomaceous Earth / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D019800:Phenol / Q000302:isolation & purification*; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000814:Aniline Compounds; D014874:Water Pollutants, Chemical; D019800:Phenol; D000536:Aluminum Hydroxide; D007692:Diatomaceous Earth; C033787:diatomite; C023650:aniline