AI Article Synopsis
- Two carbon composite materials were created using avocado biochar mixed with methyl polysiloxane, differing in the timing of the biochar addition during the preparation process.
- Characterization techniques revealed significant differences in their specific surface areas, with sample 1 having 115 m²/g and sample 2 having 580 m²/g.
- Both samples were effective in adsorbing the antibiotic ciprofloxacin from water, showing different maximum adsorption capacities and thermodynamic properties indicating a spontaneous and physical adsorption process.
Article Abstract
Two carbon composite materials were prepared by mixing avocado biochar and methyl polysiloxane (MK). Firstly, MK was dissolved in ethanol, and then the biochar was added at different times. In sample 1 (R1), the time of adding biochar was immediately after dissolving MK in ethanol, and in sample 2 (R), after 48 h of MK dissolved in ethanol. The samples were characterized by nitrogen adsorption/desorption measurements obtaining specific surface areas (S) of 115 m2 g (R) and 580 m2 g (R). The adsorbents were further characterized using scanning electron microscopy, FTIR and Raman spectroscopy, adsorption of vapors of n-heptane and water, thermal analysis, Bohem titration, pHpzc, and C H N elemental analysis. R and R adsorbents were employed as adsorbents to remove the antibiotic ciprofloxacin from the waters. The t and t based on the interpolation of Avrami fractional-order were 20.52 and 246.4 min (R) and 14.00 and 157.6 min (R), respectively. Maximum adsorption capacities (Q) based on the Liu isotherm were 10.77 (R) and 63.80 mg g (R) for ciprofloxacin. The thermodynamic studies showed a spontaneous and exothermic process for both samples, and the value of ΔH° is compatible with physical adsorption.
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| http://dx.doi.org/10.1007/s11356-022-21176-z | DOI Listing |
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