Solvothermal synthesis of different phase N-TiO2 and their kinetics, isotherm and thermodynamic studies on the adsorption of methyl orange

Jimin Fan, Zhihuan Zhao, Wenhui Liu, Yongqiang Xue, Shu Yin

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The different crystal forms of nitrogen doped-titanium oxide (N-TiO2) with different particle sizes were produced by precipitation-solvothermal method and their adsorption mechanism were also investigated. The adsorption kinetics showed that rutile N-TiO2 displayed higher adsorption capacity than anatase for methyl orange (MO) and its adsorption behavior followed the pseudo-second-order kinetics. The equilibrium adsorption rate of N-TiO2 for MO was well fitted by the Langmuir isotherm model and the adsorption process was monolayer adsorption. The adsorption capacity decreased with increasing temperature. The average correlation coefficient was beyond 97%. The thermodynamic parameters (δaGθm, δaHθm, and δaSθm) were calculated. It was found that anatase and rutile N-TiO2 had different adsorption enthalpy and entropy. The smaller the particle size, the greater the surface area and surface energy was, then δaGθm decreased and the standard equilibrium constant increased at the same time. The adsorption process onto different crystalline phase N-TiO2 was exothermic and non-spontaneous.

Original languageEnglish
Pages (from-to)229-236
Number of pages8
JournalJournal of Colloid And Interface Science
Volume470
DOIs
Publication statusPublished - 2016 May 15
Externally publishedYes

Keywords

  • Adsorption
  • Anatase
  • Kinetics
  • N-TiO
  • Rutile
  • Thermodynamics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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