Removal of hexavalent chromium by biochar derived from Azadirachta indica leaves: Batch and column studies
- Authors
- Thangagiri, B.; Sakthivel, A.; Jeyasubramanian, K.; Seenivasan, S.; Raja, J. Dhaveethu; Yun, Kyusik
- Issue Date
- Jan-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Adsorption of chromium; Breakthrough curve; Fixed-bed column; Neem biochar; Primary adsorption zone
- Citation
- CHEMOSPHERE, v.286
- Journal Title
- CHEMOSPHERE
- Volume
- 286
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/82405
- DOI
- 10.1016/j.chemosphere.2021.131598
- ISSN
- 0045-6535
- Abstract
- This report details the preparation, characterization, and applications of an inexpensive adsorbent obtained from Azadirachta indica leaves (Neem biochar (NBC)) and used to remove Cr(VI) from the synthetic waste water. The obtained NBC was characterized by XRD, FTIR, FESEM, EDX and Zeta potential measurements. Adsorption experiments conducted at various pH levels confirmed that 58.54 mg g-1 of Cr(VI) was removed by NBC at pH 2. Experiments conducted at various temperatures revealed that the Cr(VI) adsorption on NBC fits the Langmuirtype adsorption isotherm. A fixed-bed column study was conducted to obtain breakthrough curve for the adsorption process, which confirmed that the NBC usage rate was 4.63 g/L. Cr(VI)NBC was reactivated by NaOH treatment, and the reactivated NBC was used as a sorbent to remove fresh Cr(VI) from the synthetic waste water repeatedly. A cost analysis was also performed for the Cr(VI) removal confirmed that the process was less expensive.
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Collections - 바이오나노대학 > 바이오나노학과 > 1. Journal Articles
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