title: Trapping the lead ion in multi-components aqueous solution by natural clinoptilolite.
abstract: To study whether natural clinoptilolite could selectively capture Pb(2+) ion in the aqueous solution containing salt and glycine as well as nitrosamines, the natural zeolite was utilized in the complex solution with pH value of 1.2 in comparison with other porous materials such as zeolite NaZSM-5 and activated carbon. Clinoptilolite exhibited the highest capability in adsorbing Pb(2+) ion in the solution at 37 degrees C, achieving the capacity of 7 mg/g, two times more than that by other zeolites and six times over that by activated carbon, and the adsorption equilibrium could be achieved within 2h. The impacts of solid-liquid ratio, initial concentration of Pb(2+) and the competition of other metal ions or volatile nitrosamines on the adsorption were examined, and the change in Gibbs energy for the ion-exchanged of Pb(2+) ion by clinoptilolite was discussed, through which the ion-exchange process was proven to be spontaneous. Moreover, both the selectivity of clinoptilolite toward Pb(2+) ion in complex solution and the venial toxicity of clinoptilolite on the viability of RAW264.7 cells were investigated in this article.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, College of Chemistry and Chemistry Engineering, Nanjing University, Nanjing 210093, China.
authors.forename: Yu Fei
authors.initials: YF
authors.lastname: Tao
authors.forename: Yue
authors.initials: Y
authors.lastname: Qiu
authors.forename: Shu Yu
authors.initials: SY
authors.lastname: Fang
authors.forename: Zhu Yun
authors.initials: ZY
authors.lastname: Liu
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Jian Hua
authors.initials: JH
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D007854:Lead / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008958:Models, Molecular; D012996:Solutions; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction; D017641:Zeolites / Q000737:chemistry*
chemical_list: D012996:Solutions; D014867:Water; C083175:clinoptilolite; D017641:Zeolites; D007854:Lead