Jinnapat , A. and Rattanasing, A. (2021) “A study of absorption capacity of zinc ions onto coffee residue activated carbon”, NKRAFA JOURNAL OF SCIENCE AND TECHNOLOGY, 17(2), pp. 69–78. available at: https://ph02.tci-thaijo.org/index.php/nkrafa-sct/article/view/245521 (accessed: 14 September 2026).