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Composite of methyl polysiloxane and avocado biochar as adsorbent for removal of ciprofloxacin from waters

Teixeira, R. A ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s11356-022-21176-z
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2022
  4. Abstract:
  5. 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 (R2), after 48 h of MK dissolved in ethanol. The samples were characterized by nitrogen adsorption/desorption measurements obtaining specific surface areas (SBET) of 115 m2 g−1 (R1) and 580 m2 g−1 (R2). 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. R1 and R2 adsorbents were employed as adsorbents to remove the antibiotic ciprofloxacin from the waters. The t1/2 and t0.95 based on the interpolation of Avrami fractional-order were 20.52 and 246.4 min (R1) and 14.00 and 157.6 min (R2), respectively. Maximum adsorption capacities (Qmax) based on the Liu isotherm were 10.77 (R1) and 63.80 mg g−1 (R2) for ciprofloxacin. The thermodynamic studies showed a spontaneous and exothermic process for both samples, and the value of ΔH° is compatible with physical adsorption. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature
  6. Keywords:
  7. Adsorption thermodynamics ; Hydrophobic surface ; Methyl polysiloxane and biochar composite ; Pharmaceutical adsorption ; Synthetic effluents ; Biochar ; Drug ; Effluent ; Hydrophobicity ; Alcohol ; Antiinfective agent ; Siloxane ; Chemistry ; Persea ; PH ; Water pollutant ; Adsorption ; Anti-Bacterial Agents ; Carbon ; Charcoal ; Ciprofloxacin ; Ethanol ; Hydrogen-Ion Concentration ; Kinetics ; Nitrogen ; Siloxanes ; Thermodynamics ; Water ; Water Pollutants, Chemical
  8. Source: Environmental Science and Pollution Research ; Volume 29, Issue 49 , 2022 , Pages 74823-74840 ; 09441344 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11356-022-21176-z