Adsorptive removal of Cr(VI) from wastewater by alpha-FeOOH hierarchical structure: kinetics, equilibrium and thermodynamics

作者：Wang, Yong; Ma, Ji; Chen, Kezheng^*

来源：Physical Chemistry Chemical Physics, 2013, 15(44): 19415-19421.

DOI：10.1039/c3cp52867g

• FLOWERLIKE ALPHA-FE2O3 NANOSTRUCTURES
• ADSORBENT
• OXIDES
• DYE

A novel hollow urchin-like alpha-FeOOH hierarchical structure was fabricated via a one-pot hydrothermal procedure without using any templates, surfactants or organic raw materials. An inside-out amorphous ripening mechanism was proposed to unravel its structural evolution. The kinetics, equilibrium and thermodynamics of its adsorptive removal of Cr(VI) from wastewater were comprehensively investigated. It was found that the adsorption process can be depicted using a pseudo-second-order model, and a high adsorption capacity of 58.97 mg g(-1) was obtained from the equilibrium adsorption isotherm. Also, the thermodynamic parameters (i.e., enthalpy, entropy and Gibbs free energy) at different temperatures were acquired to reveal a spontaneous adsorption process, with both physical and chemical characteristics.

• 出版日期2013
• 单位青岛科技大学