Applying an activated carbon/silver catalyst to the decomposition of the aqueous solutions of tetramethyl ammonium hydroxide

作者：Lu Li Wei; Peng Yen Ping^*; Chang Cheng Nan

来源：Journal of the Taiwan Institute of Chemical Engineers, 2018, 88: 130-136.

DOI：10.1016/j.jtice.2018.03.044

• Tetramethyl ammonium hydroxide (TMAH)
• AC/Ag
• Hydrogen peroxide (H2O2)
• Tertbutyl alcohol (TBA)
• Catalytic ozonation

This study applied catalytic (AC/Ag) ozonation combined with hydrogen peroxide (H2O2) to investigate the feasibility of tetramethyl ammonium hydroxide (TMAH) decomposition. The synthesized catalysts were characterized using X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. The pH of the isoelectric point of AC/Ag was 10.8. Subsequently, the removal efficiency of the system was examined using operational parameters such as pH condition (3, 5, 7, 9, 11, and 12), AC/Ag dosage (0.5, 1, 1.5, and 2 g/L), and H2O2 (4.4, 8.8, 17.6, and 26.4mM). The results revealed that the optimal mineralization rate of TMAH was 72% when using the 1.5 g/L AC/Ag catalyst combined with 8.8mM H2O2 at pH 11. The removal rate of 500 mg/L-TMAH was 81%, and the end products in nitrate and ammonium were 167 mg/L and 102 mg/L, respectively, for a 60 min reaction time. Tert-butyl alcohol (TBA) was used as an center dot OH scavenger to assess the contributions of direct and indirect ozonation. The results indicated that indirect ozonation dominated in TMAH mineralization. The calculated krad value of the AC/Ag/H2O2 ozonation method was 1.91 x 10(-2) min(-1), which was higher than that in the AC/Ag ozonation (1.21 x 10(-2) min(-1)) and sole ozonation (1.70 x 10(-3) min(-1)) methods.

• 出版日期2018-7