| Title: |
Phenyl acetic acid modified biosilica from Cyclotella striata TBI diatom as an adsorbent for low molecular weight polycyclic aromatic hydrocarbons. |
| Authors: |
Fakhrizal, Zaki Yusuf; Machmud, Fazsa Islamianti; Azis, Muhammad Yudhistira; Putri, Rindia M.; Rosmalina, Raden Tina; Nurachman, Zeily |
| Source: |
International Journal of Environmental Analytical Chemistry; Dec2025, Vol. 105 Issue 19, p7718-7738, 21p |
| Subject Terms: |
POLYCYCLIC aromatic hydrocarbons; SORBENTS; SILICATES; HYDROPHOBIC interactions; THERMOPHYSICAL properties; PHENYLACETATES; ADSORPTION kinetics; DIATOMS |
| Abstract: |
Polycyclic aromatic hydrocarbons (PAHs) are persistent environmental contaminants with health risks due to bioaccumulation. This study explores phenyl acetic acid (PAA)-modified biosilica from Cyclotella striata as an adsorbent for low molecular weight (LMW) PAHs: phenanthrene, anthracene, and fluorene. Biosilica was isolated from C. striata biomass via acid soaking and calcination, then modified with PAA to enhance hydrophobicity and affinity towards PAHs by introducing aromatic groups, facilitating π-π interactions. Characterisation using FTIR, water contact angle (WCA), and BET surface area analysis confirmed successful modification. FTIR results confirmed the successful removal of organic residues and the presence of new functional groups post-modification. Post-modification, the WCA increased, reflecting a more hydrophobic surface. BET analysis showed a surface area decrease from 152.985 m2/g for unmodified biosilica to 86.039 m2/g post-modification. Adsorption experiments indicated qe values followed the following trend: anthracene > phenanthrene > fluorene. Kinetics studies revealed pseudo-second-order kinetics, reaching equilibrium within 80–120 minutes, with adsorption occurring in distinct phases. Adsorption isotherm studies of modified biosilica sorbents showed that the Freundlich model best described anthracene and phenanthrene adsorption, suggesting multilayer adsorption, while fluorene followed the Langmuir model, indicating monolayer adsorption. Adsorption thermodynamics of modified biosilica sorbents shows that adsorption of LMW PAHs is endothermic. After modification, the PAHs are less selective towards fluorene. These results demonstrate the potential of PAA-modified biosilica as an effective adsorbent for LMW PAHs. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |