“Removal of Cadmium Ions from Synthetic Wastewater by using Pennisetum purpureum (Elephant Grass) as Low Cost Biodegradable Adsorbent (Biosorbent)”, UMT JUR, vol. 1, no. 1, pp. 103–112, Jan. 2019, doi: 10.46754/umtjur.v1i1.56.