Sintesis Karbon Aktif dari Ranting Teh untuk Adsorpsi Logam Berat Pb(II)

Abstract

Tea branch waste, which is abundant in Indonesia, has a significant lignocellulose content so that it can be used as a raw material with a higher economic value, namely activated carbon. In this study, activated carbon was synthesized from tea branch with KOH activation to be then applied as a lead metal adsorbent. The purpose of this study is to determine the characteristics of activated carbon from synthesis and its ability to adsorption lead metal at optimum conditions. The highest yield of activated carbon was obtained at a carbonization temperature of 400oC with a yield of 18.77% of the mass of tea branch. The functional group of activated carbon is analyzed with FTIR. The results of the analysis show that activated carbon has a high purity with the presence of OH, C=C aromatic, C-O, and C-H as components of the flatten. The optimum condition of lead metal adsorption was obtained at a contact time of 150 minutes with the highest %removal of 99.99%. Adsorption of lead metal with activated carbon follows the Langmuir isotherm model with a maximum adsorption capacity of 20.66 mg/g at 25oC and 1 atm. Keywords: Tea branch waste, activated carbon, KOH, lead(II), adsorption