One-step synthesis of rod-shaped phillipsite using circulating fluidized bed fly ash and its application for removal heavy metal

Abstract

In this study, rod-shaped phillipsite was prepared using circulating fluidized bed fly ash by one-step synthesis and applied to adsorption of heavy metal Ni²⁺ ions for the first time. The X-ray diffraction and field emission scanning electron microscopy results suggested that rod-shaped phillipsite was composed of intergrown phillipsite crystals with cross-shaped pillar and size around 300–800 nm. EDS result showed that the Si/Al molar ratio of as-synthesized phillipsite was approximately equal to 1.4. The adsorption capacity and removal efficiency of Ni²⁺ over rod-shaped phillipsite were 10.06 mg/g and 89.56%, respectively, while the adsorption reaction followed pseudo-first-order kinetics.

Keywords:

• Circulating fluidized bed fly ash
• rod-shaped phillipsite
• removal efficiency
• adsorption

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under grant number 21676209; Key Research and Development Project of Shaanxi Province under grant 2019GY-137; and Cultivating Fund of Excellent Doctorate Thesis of Xi’an University of Architecture and Technology under grant number 6040318008.