Halloysite nanoclay supported adsorptive removal of oxytetracycline antibiotic from aqueous media.
作者： Sammani Ramanayaka , Binoy Sarkar , Asitha T. Cooray , Yong Sik Ok , Meththika Vithanage
DOI: 10.1016/J.JHAZMAT.2019.121301
关键词: Halloysite 、 Adsorption 、 Oxytetracycline 、 Nuclear chemistry 、 Chemistry 、 Aqueous solution 、 Ionic strength 、 Cationic polymerization 、 Chemisorption 、 Ionic bonding
摘要: Abstract Halloysite nanoclay was utilized to retain aqueous oxytetracycline (OTC) which is extensively used in the veterinary industry. The micro-structure and functionality of were characterized through spectroscopic techniques before after adsorption. OTC removal experiments performed at different pH conditions (pH 3.0–9.0), ionic strengths (0.001, 0.01, 0.1 M NaNO3) contact time (up 32 h) an initial 25 mg/L concentration with 1.0 g/L halloysite. Oxytetracycline adsorption dependent, best observed range 3.5–5.5 at a 0.001 M strength. At 3.5, maximum amount 21 mg/g translated 68% loading. Positively charged inner lumen negatively outer tubular halloysite structure led form inner-sphere complexes anionic cationic forms OTC, respectively. A rapid kinetic study where 62% adsorbed 90 min.. Pseudo-second order equation obeyed by data indicated that governed chemisorption, whereas Hill isotherm most fitted capacity 52.4 mg/g indicating cooperative phenomenon.
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