title: Study on nicotinamide adenine dinucleotide adsorbed at nano-boehmite/water and nano-corundum/water interfaces.
abstract: In this study, the adsorption behaviors of nicotinamide adenine dinucleotide (NAD(+)) on nano-boehmite (γ-AlOOH) and nano-corundum (γ-Al(2)O(3)) surfaces were investigated. The results showed that NAD(+) was predominantly adsorbed at the boehmite/water and corundum/water interfaces in outer-sphere fashions by electrostatic interaction between NAD(+) phosphate and surface hydroxyl groups. However, the features of ATR-FTIR spectra suggested that some minor inner-sphere complex should be considered at low pH conditions on corundum surface, which was consistent with the effect of NAD(+) on dissolution rate of corundum. In addition, the adsorption data well fitted with Langmuir and Freundlich isotherms on the boehmite and corundum surfaces, respectively. Also, the Gibbs adsorption energy was negative on the boehmite surface, which indicated that the adsorption behavior was spontaneous.
authors.affiliation: Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Xie
authors.forename: Yanping
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaodi
authors.initials: X
authors.lastname: Yang
authors.forename: Rong Fu
authors.initials: RF
authors.lastname: Chen
authors.forename: Ren Fang
authors.initials: RF
authors.lastname: Shen
mesh_terms: D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry*; D009243:NAD / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D009243:NAD; D000536:Aluminum Hydroxide; C069471:aluminum oxide hydroxide; D000537:Aluminum Oxide