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Preparation of Zeolite F as Slow Release Fertilizers from K‐Feldspar Powder
Author(s) -
Yuan Jiangyan,
Yang Jing,
Ma Hongwen,
Chang Qianqian
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702120
Subject(s) - zeolite , potassium , fourier transform infrared spectroscopy , scanning electron microscope , crystallization , nuclear chemistry , tetragonal crystal system , powder diffraction , chemistry , analytical chemistry (journal) , feldspar , mineralogy , materials science , crystallography , crystal structure , chemical engineering , catalysis , chromatography , organic chemistry , quartz , metallurgy , engineering , composite material
Influence of KOH concentration and reaction time on the synthesis of zeolite F from K‐feldspar, and the kinetics of potassium slow release from the product were studied. X‐ray diffraction (XRD), Fourier transformation infrared spectrometry (FTIR), and scanning electron microscopy (SEM) were applied to characterize the as‐synthesized samples. The XRD results indicate that there exist K−G zeolite (K 2 Al 2 SiO 6 ⋅H 2 O) with hexagonal structure at the KOH concentration of 2 mol⋅kg −1 and zeolite F (KAlSiO 4 ⋅1.5H 2 O) with tetragonal structure at 4–5 mol⋅kg −1 . In terms of synthesis efficiency, crystallization time of 12 h was chosen as optimal condition. The surface area and pore diameter of zeolite F sample synthesized in 4 mol⋅kg −1 at 95 °C for 12 h were investigated by surface area analyzer, the values of which are 27 m 2 /g and 0.513 nm, respectively. Slow‐release testing results suggest that the potassium cumulative release fraction of zeolite F in water for 42 d is up to 68.97% and can be fitted well with Elovich equation.