TY - JOUR
T1 - Sustainable utilization of Fe3O4-modified activated lignite for aqueous phosphate removal and ANN modeling
AU - Samaraweera, Hasara
AU - Zahir, Abdul
AU - Alam, Shah Saud
AU - Perera, S. Sameera
AU - Masud, Md Abdullah Al
AU - Khan, Afzal Husain
AU - Oguntuyi, Daniel Olabode
AU - Yunusu, Wana
AU - Shin, Won Sik
AU - Mohamed, Mohamed Mostafa
AU - Mlsna, Todd
N1 - Publisher Copyright:
© 2024 Elsevier Inc.
PY - 2024/11/1
Y1 - 2024/11/1
N2 - Lignites are widely available and cost-effective in many countries. Sustainable methods for their utilization drive innovation, potentially advancing environmental sustainability and resource efficiency. In the present study, Fe3O4 (∼25.1 nm) supported on KOH-activated lignite (A−L) displayed 8 times higher phosphate removal than pristine A−L (67.6 mg/g vs. 8.5 mg/g at pH 5, 50 mg of absorbent in 25 mL of 1500 ppm [phosphate]), owing to its abundant Fe3O4 (10 wt% of Fe) nanoparticle content. The removal occurred within ∼2 h, following a pseudo-second-order kinetic model. Across pH levels ranging from 5.0 to 9.0, Fe3O4−A−L's phosphate removal occurs via both chemisorption and precipitation, as evident by kinetic, pH, and XPS analyses. The phosphate adsorption fits better with the Freundlich isotherm. The combined benefits of facile recovery, rapid phosphate uptake, straightforward regeneration, and attractive post-adsorption benefits (e.g., possibly use as a Fe, P-rich fertilizer) make magnetic Fe3O4−A−L a promising candidate for real-world applications. Artificial Neural Network (ANN) modeling indicates an excellent accuracy (R2 = 0.99) in predicting the amount of phosphate removed by Fe3O4−A−L. Sensitivity analysis revealed both temperature and initial concentration as the most influencing factors. Leveraging lignite in environmentally friendly applications not only addresses immediate challenges but also aligns with sustainability goals. The study clearly articulates the potential benefits of utilizing lignite for sustainable phosphate removal and recovery, offering avenues for mitigating environmental concerns while utilizing resources efficiently.
AB - Lignites are widely available and cost-effective in many countries. Sustainable methods for their utilization drive innovation, potentially advancing environmental sustainability and resource efficiency. In the present study, Fe3O4 (∼25.1 nm) supported on KOH-activated lignite (A−L) displayed 8 times higher phosphate removal than pristine A−L (67.6 mg/g vs. 8.5 mg/g at pH 5, 50 mg of absorbent in 25 mL of 1500 ppm [phosphate]), owing to its abundant Fe3O4 (10 wt% of Fe) nanoparticle content. The removal occurred within ∼2 h, following a pseudo-second-order kinetic model. Across pH levels ranging from 5.0 to 9.0, Fe3O4−A−L's phosphate removal occurs via both chemisorption and precipitation, as evident by kinetic, pH, and XPS analyses. The phosphate adsorption fits better with the Freundlich isotherm. The combined benefits of facile recovery, rapid phosphate uptake, straightforward regeneration, and attractive post-adsorption benefits (e.g., possibly use as a Fe, P-rich fertilizer) make magnetic Fe3O4−A−L a promising candidate for real-world applications. Artificial Neural Network (ANN) modeling indicates an excellent accuracy (R2 = 0.99) in predicting the amount of phosphate removed by Fe3O4−A−L. Sensitivity analysis revealed both temperature and initial concentration as the most influencing factors. Leveraging lignite in environmentally friendly applications not only addresses immediate challenges but also aligns with sustainability goals. The study clearly articulates the potential benefits of utilizing lignite for sustainable phosphate removal and recovery, offering avenues for mitigating environmental concerns while utilizing resources efficiently.
KW - ANN modeling
KW - Desorption
KW - Iron-oxide biochar
KW - Lignite
KW - Phosphate removal
KW - Sustainable applications
UR - http://www.scopus.com/inward/record.url?scp=85199382613&partnerID=8YFLogxK
U2 - 10.1016/j.envres.2024.119618
DO - 10.1016/j.envres.2024.119618
M3 - Article
C2 - 39009211
AN - SCOPUS:85199382613
SN - 0013-9351
VL - 260
JO - Environmental Research
JF - Environmental Research
M1 - 119618
ER -