NDLI: Preparation of biomorphic porous calcium titanate and its application for preconcentration of nickel in water and food samples.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhang, Dong Wang, Min Ren, Guang-jun Song, En-jun
Description	Author Affiliation: Zhang D ( School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, PR China. Electronic address: sylgdxdong@sina.com.)
Abstract	Biomorphic porous nanocrystalline-calcium titanate (SPCTO) was successfully prepared using the sol-gel method and with sorghum straw as the template. Characterization was conducted through XRD, SEM and FTIR. The ability of SPCTO to adsorb nickel ion in water was assessed. Elution and regeneration conditions, as well as the thermodynamics and kinetics of nickel adsorption, were also investigated. The result showed that the sorbent by the sol-gel template method was porous and has a perovskite structure with an average particle diameter of 26 nm. The nickel ion could be quantitatively retained at a pH value range of 4-8, but the adsorbed nickel ion could be completely eluted using 2 mol L(-1) HNO3. The adsorption capacity of SPCTO for nickel was found to be 51.814 mg g(-1) and the adsorption behavior followed a Langmuir adsorption isotherm and a pseudo-second-order kinetic model. The enthalpy change (ΔH) of the adsorption process was 33.520 kJ mol(-1). At various temperatures, Gibbs free energy changes (ΔG) were negative, and entropy changes (ΔS) were positive. The activation energy (Ea) was 25.291 kJ mol(-1) for the adsorption. These results demonstrate that the adsorption was an endothermic and spontaneous physical process. This same method has been successfully applied in the preconcentration and determination of nickel in water and food samples with good results.
File Format	HTM / HTML
ISSN	09284931
Issue Number	8
Volume Number	33
e-ISSN	18730191
Journal	Materials Science and Engineering: C
Language	English
Publisher	Elsevier
Publisher Date	2013-12-01
Publisher Place	Netherlands
Access Restriction	Subscribed
Subject Keyword	Discipline Materials Science Calcium Compounds Chemistry Nickel Oxides Titanium Water Adsorption Gels Hydrogen-ion Concentration Kinetics Nanoparticles Isolation & Purification Particle Size Porosity Solid Phase Extraction Temperature Thermodynamics Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Biomaterials Condensed Matter Physics Bioengineering Mechanical Engineering

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