Halloysite nanoclay supported adsorptive removal of oxytetracycline antibiotic from aqueous media
- Authors
- Ramanayaka, Sammani; Sarkar, Binoy; Cooray, Asitha T.; Ok, Yong Sik; Vithanage, Meththika
- Issue Date
- 15-2월-2020
- Publisher
- ELSEVIER
- Keywords
- Emerging contaminants; Nanomaterials; Pharmaceuticals; Adsorption; Water pollution
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.384
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 384
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57646
- DOI
- 10.1016/j.jhazmat.2019.121301
- ISSN
- 0304-3894
- Abstract
- Halloysite nanoclay was utilized to retain aqueous oxytetracycline (OTC) which is extensively used in the veterinary industry. The micro-structure and functionality of the nanoclay were characterized through spectroscopic techniques before and after adsorption. The OTC removal experiments were performed at different pH conditions (pH 3.0-9.0), ionic strengths (0.001, 0.01, 0.1 M NaNO3) and contact time (up to 32 h) at an initial 25 mg/L OTC concentration with 1.0 g/L halloysite. Oxytetracycline adsorption was pH dependent, and the best pH was observed in the range of pH 3.5-5.5 at a 0.001 M ionic strength. At pH 3.5, the maximum OTC adsorption amount was 21 mg/g which translated to 68% removal of the initial OTC loading. Positively charged inner lumen and negatively charged outer lumen of the tubular halloysite structure led to form inner-sphere complexes with the anionic and cationic forms of OTC, respectively. A rapid adsorption of OTC was observed in the kinetic study where 62% OTC was adsorbed in 90 min.. Pseudo-second order equation obeyed by the kinetic data indicated that the adsorption was governed by chemisorption, whereas Hill isotherm equation was the most fitted with a maximum adsorption capacity of 52.4 mg/g indicating a cooperative adsorption phenomenon.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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