and sustainability. In recent years, the use of coconut wastes even though has been extensively studied in adsorbent preparation
for specific applications [15]-[19]. However, there is no research on coconut pith except for coconut shell as elemental mercury
adsorbents [20], [21]. In addition, the coconut wastes were also reported on the production of carbonaceous adsorbents for the
removal of mercury [22], dye [23]-[25], arsenic [26], copper [27], and chromium [28] from water and wastewater