ADSORPSI LOGAM Fe PADA AIR ASAM TAMBANG BATUBARA MENGGUNAKAN BIOCHAR

UTAMI, CICI and Hidayati, Nurlisa and Eliza, Eliza (2025) ADSORPSI LOGAM Fe PADA AIR ASAM TAMBANG BATUBARA MENGGUNAKAN BIOCHAR. Undergraduate thesis, Sriwijaya University.

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Abstract

Mining activities carried out by PT Bukit Asam (Persero) Tbk produce liquid waste in the form of Acid Mine Drainage (AMD) which has the potential to contaminate the environment, especially the surrounding waters. AMD has a very low pH, ranging from 2 to 4, and contains dissolved heavy metals such as iron (Fe), which, if not managed properly, can threaten ecosystems and human health. One of the most popular methods for reducing metal content in liquid waste is adsorption, because this method is relatively simple, efficient, environmentally and friendly. This research aims to examine the effectiveness of activated biochar and non-activated biochar made from coconut shell through the pyrolysis process, in adsorbing Fe metal from coal mine acidic water. The biochar was activated using a 1 M HCl solution. The selection of biochar as an adsorbent is due to its environmentally friendly nature, low cost, and porous structure that supports adsorption capability. Before applying it to AMD, an optimal adsorption process condition was determined using FeCl3.6H2O solution as a Fe metal model. Activated biochar has optimum conditions at pH 6 with an adsorption capacity of 4.8083 mg/L, at a time of 60 minutes with an adsorption capacity of 4.7599 mg/L, and an adsorbent mass of 0.1 g with an adsorption capacity of 4.9424 mg/L, while non-activated biochar reaches optimum conditions at 90 minutes with an adsorption capacity of 4.4475 mg/L, at pH 6 with an adsorption capacity of 4.4475 mg/L, and a mass of 0.1 g with an adsorption capacity of 4.8909 mg/L. The adsorption process follows a pseudo second-order kinetics model and Freundlich isotherm model, with regression results approaching one, namely 0.9995 and 0.8005, indicating that the adsorption kinetics occur chemically and take place on heterogeneous adsorbent surfaces. Testing on acid mine drainage water samples showed that activated biochar significantly reduced Fe concentration more effectively than non-activated biochar, with maximum adsorption efficiency of 93.5 % and 38.6 %, respectively. The characterization results using FTIR and BJH analysis indicated that the activation process is able to increase the surface area of the pores as well as the presence of active functional groups that play a crucial role in improving adsorption performance. Based on BJH analysis, the activated biochar has a pore surface area of 0.34909 m²/g, a pore volume of 0.00136 cc/g, and an average pore radius of 7.7900 nm, which supports its ability to adsorb Fe metal more effectively.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Adsorpsi, Air AsamTambang, Aktivasi, Biochar, logam besi
Subjects:	Q Science > QD Chemistry > QD1-999 Chemistry Q Science > QD Chemistry > QD146-197 Inorganic chemistry
Divisions:	08-Faculty of Mathematics and Natural Science > 47201-Chemistry (S1)
Depositing User:	Cici Utami
Date Deposited:	24 Jul 2025 05:36
Last Modified:	24 Jul 2025 05:36
URI:	http://repository.unsri.ac.id/id/eprint/180290

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