Coconut coir pith was cleaned and then
dried over night in oven. After that, the dried
coconut coir pith was calcined in absence of
oxygen at 400–800°C for 1 hour. After calcination,
modified coconut coir pith was sieved to separate
the adsorbent which are smaller than 90, 90–125,
125–180, 180–250, and larger than 250 μm.