Open AccessSynthesis of Na-A zeolite from water treatment residue using hydrothermal and microwave techniques
Author(s) -
B. Theptham,
Suwimol Asavapisit
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/526/1/012029
Subject(s) - zeolite , scanning electron microscope , hydrothermal circulation , nuclear chemistry , residue (chemistry) , chemistry , microwave , raw material , cation exchange capacity , mineralogy , materials science , chemical engineering , catalysis , organic chemistry , composite material , geology , physics , quantum mechanics , soil science , engineering , soil water
Na-A zeolite was synthesized from water treatment residue (WTR) using hydrothermal and microwave techniques. WTR was brought from Metropolitan Waterworks Authority (Thailand) and was activated by firing at 700 °C for 3 h in an electric furnace. The activated WTR was reacted with 3 M NaOH solution in a reactor under a controlled temperature of 80, 90 and 100 °C for 8, 10, 12, and 14 h. SEM (Scanning electron microscopy) images reveal the cubic crystal of zeolite. The highest cation exchange capacity (CEC) was obtained from sample synthesized at 90 °C for 14 h and gave the CEC value of 3.14 meq/g Ca 2+ . For the microwave technique, the raw materials were reacted at 80 90 and 100°C for 30, 60, and 120 min. Results showed that the sample obtained at 80 °C for 30 min represented the highest CEC value of 0.29 meq/g Ca 2+ .