Mohadi, Risfidian and Palapa, Neza Rahayu and Siregar, Patimah Mega Syah Bahar Nur and Normah, Normah and Juleanti, Novie and Wijaya, Alfan and Lesbani, Aldes (2021) Removal of Cr(VI) from aqueous solution by biochar derived from rice husk (Similarity). Turnitin Universitas Sriwijaya. (Submitted)
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Abstract
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.
| Item Type: | Other |
|---|---|
| Subjects: | #3 Repository of Lecturer Academic Credit Systems (TPAK) > Results of Ithenticate Plagiarism and Similarity Checker |
| Divisions: | 08-Faculty of Mathematics and Natural Science > 47102-Chemistry (S2) |
| Depositing User: | Dr.rer.nat Risfidian Mohadi |
| Date Deposited: | 05 Sep 2022 09:12 |
| Last Modified: | 05 Sep 2022 09:12 |
| URI: | http://repository.unsri.ac.id/id/eprint/77906 |
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