title: Adsorption of Heavy Metal Ions from Aqueous Solutions by Bentonite Nanocomposites.
abstract: A series of bentonite nanocomposites have been synthesized by modifying bentonite with hexadecyltrimethylammonium bromide (CTMAB) and the common complexing agents, complexone (ethylene diamine tetraacetic acid, EDTA) or mercaptocomplexant (2-Mercaptobenzothiazole, MBT). These adsorbents are used to remove heavy metal ions (Cu(2+), Zn(2+), Mn(2+),Co(2+)). The Bent-CTMAB-MBT adsorbed metal ions are higher than Bent-CTMAB-EDTA under the same ion concentration in AAS. Compared with the single ion system, the adsorption of the mixed ion system of Cu(2+), Zn(2+), Mn(2+), Co(2+) had decreased differently. In the mixed system, the adsorption of Mn(2+) is significantly lower, but the adsorption of Cu(2+) was highest. The adsorption sequence of these four metal ions was Cu(2+) > Zn(2+) > Co(2+) > Mn(2+), and the selective adsorption was closely related to the hydration energy of heavy metal ions. We could remove more metal ions in different stages with the adsorption sequence.
authors.affiliation: College of Chemistry, Xiangtan University, Xiangtan 411100, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Ma
authors.forename: Guojun
authors.initials: G
authors.lastname: Su
authors.forename: Xueping
authors.initials: X
authors.lastname: Zhang
authors.forename: Wen
authors.initials: W
authors.lastname: Huang
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry / Q000302:isolation & purification*; D053761:Nanocomposites / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D001546:Bentonite