title: A study of the potential application of nano-Mg(OH)2 in adsorbing low concentrations of uranyl tricarbonate from water.
abstract: This work aims at the investigation of nano-Mg(OH)(2) as a promising adsorbent for uranium recovery from water. Systematic analysis including the uranium adsorption isotherm, the kinetics and the thermodynamics of adsorption of low concentrations of uranyl tricarbonate (0.1-20 mg L(-1)) by nano-Mg(OH)(2) was carried out. The results showed a spontaneous and exothermic uranium adsorption process by Mg(OH)(2), which could be well described with pseudo second order kinetics. Surface site calculation and zeta potential measurement further demonstrated that UO(2)(CO(3))(3)(4-) was a monolayer adsorbed onto nano-Mg(OH)(2) by electrostatic forces. Accordingly, the adsorption behavior met the conditions of the Langmuir isotherm. Moreover, in most of the reported literature, nano-Mg(OH)(2) had a higher UO(2)(CO(3))(3)(4-) adsorption affinity b, which implied a higher adsorption amount at equilibrium in a dilute adsorbate system. The significance of the adsorption affinity b for choosing and designing adsorbents with respect to low concentration of resources/pollutants treatment has also been assessed.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, PR China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Cao
authors.forename: Feng
authors.initials: F
authors.lastname: Huang
authors.forename: Zanyong
authors.initials: Z
authors.lastname: Zhuang
authors.forename: Zhang
authors.initials: Z
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D000863:Antacids / Q000737:chemistry / Q000493:pharmacokinetics; D002254:Carbonates / Q000737:chemistry / Q000493:pharmacokinetics*; D011232:Chemical Precipitation; D006863:Hydrogen-Ion Concentration; D008276:Magnesium Hydroxide / Q000737:chemistry* / Q000493:pharmacokinetics*; D053768:Metal Nanoparticles / Q000737:chemistry; D008954:Models, Biological; D009994:Osmolar Concentration; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D017974:Uranium Compounds / Q000737:chemistry / Q000493:pharmacokinetics*
chemical_list: D000863:Antacids; D002254:Carbonates; D017974:Uranium Compounds; D008276:Magnesium Hydroxide