Nur Hanani Hasana, Rafeah Wahi, Yusralina Yusof, Wan Roslina Wan Yusof, and Zeti Akhtar Abdul Manan , trans. 2020. “Coconut Shell Biochar for Removal of Cu(II) from Aqueous Solution”. Pakistan Journal of Analytical & Environmental Chemistry 21 (2): 280 – 292. https://doi.org/10.21743/pjaec/2020.12.30.