Budput, A., Yan, D. Y., Htikea, M. T. T., Khamdahsag, P. and Tanboonchuy, V. (2023) “Hexadecyltrimethylammonium-modified fly-ash zeolite for sulfate removal in treated coal-fired power plant effluent”, Engineering and Applied Science Research, 50(4), pp. 350–358. available at: https://ph01.tci-thaijo.org/index.php/easr/article/view/251869 (accessed: 29 August 2026).