Risfidian Mohadi, Neza Rahayu Palapa, Tarmizi Taher, Patimah Mega Syah Bahar Nur Siregar, Normah, Novie Juleanti, Alfan Wijaya, Aldes Lesbani
In this research, biochar was produced from local paddy rice husk in Sumatera and used as a bio-sorbent of Cr(VI) in an aqueous solution. The rice husk biochar (BC) was characterized using X-ray diffraction (XRD), Fourier Transform Infra-Red (FTIR), surface area-specific, and SEM morphology analysis. This XRD characterization showed a 002 reflection at 23o with broad intense diffraction, as well as the appearance of silicate oxide, and carbon vibrations. The surface area and SEM morphologies confirm that after pyrolysis the rice husk surface contained various particle sizes with a seven-fold increase in surface area. Furthermore, the Fourier Transform Infra-Red spectra verify the presence of functional groups, such as carboxylic C=O and aromatic C=C stretching. The result of the adsorption indicated the BC follows 2nd-order reaction with a 0.004 mg/min rate constant and Langmuir isotherm models with a coefficient correlation close to unity. Also, the maximum adsorption capacity of this substance increased from 68.996 mg/g to 161.290 mg/g. The thermodynamic analysis showed a positive enthalpy and entropy value, indicating Cr(VI) adsorption is endothermic. In addition, high amounts of heat favor the adsorption process due to the decrease in Gibbs energies caused by increasing temperature. The reusability adsorption study of Cr(VI) showed BC was a good potential adsorbent in the removal of the heavy metal from an aqueous solution. © 2021 Komunitas Ilmuwan dan Profesional Muslim Indonesia. All right reserved.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Palembang, 30139, Indonesia; Graduate School, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Palembang, 30139, Indonesia; Research Center of Inorganic Materials and Complexes, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Palembang, 30139, Indonesia; Department of Environmental Engineering, Institut Teknologi Sumatera, Lampung Selatan, 35365, Indonesia
Research at a Glance
Register to unlock
Topics & SDG Alignment
Register to unlock
Collaboration
Register to unlock
Author Profile (Selected)
Register to unlock
References Overview
Register to unlock
Journal & Source
Register to unlock
Metadata & Integrity
Register to unlock