Effect of KOH activation on hydrochar surface: FT-IR analysis

2016
Authors
Mihajlović, Marija
Petrović, Jelena

Kragović, Milan
Stojanović, Mirjana
Milojković, Jelena

Lopičić, Zorica

Koprivica, Marija
Article (Published version)

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In this study, hydrothermal carbonization (HTC) at five temperatures (180, 200, 220, 240,
and 260 C) was applied to transform Paulownia leaves (PL) into a carbonaceous sorbent of Pb(II)
from aqueous solutions. To enhance the adsorption efficiency of the obtained hydrochar (PH),
subsequent alkali activation was performed using NaOH. Preliminary results of the Pb(II) adsorption
(CPb = 200 mg/L) showed removal coefficients after 48 h of 73.44 mg/g, 82.37 mg/g, and 110.9 mg/g
for PL, PH-220, and MPH-220, respectively. The selected hydrochar (PH-220) and modified hydrochar
(MPH-220) were further investigated by scanning electron microscopy (SEM) and Fourier transform
infrared spectroscopy (FTIR). The results revealed that alkali treatment changed the hydrochar
structure and, thus, improved its adsorption performance. The kinetic parameters showed that
the Pb(II) sorption onto MPH-220 followed a pseudo-second-order model, while the intra-particle
diffusion went through two simulta...neous stages. The Langmuir isotherm model best described the
experimental data and indicated the value of 174.75 mg Pb(II)/g as the maximum adsorption capacity.
The two possible mechanisms of Pb(II) binding were complexation and/or Pb- electron interaction.
The obtained results indicate the great potential of MPH-220 for Pb(II) removal from aqueous media
and its potential utilization as an effective adsorbent for wastewater purification.
Keywords:
biowaste hydrochar / alkali modification / lead removal / kinetics and isotherm models / adsorption mechanismSource:
RAD Journal, 2016, 1, 2, 65-67Publisher:
- Niš : RAD Association
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Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Mihajlović, Marija AU - Petrović, Jelena AU - Kragović, Milan AU - Stojanović, Mirjana AU - Milojković, Jelena AU - Lopičić, Zorica AU - Koprivica, Marija PY - 2016 UR - https://ritnms.itnms.ac.rs/handle/123456789/848 AB - In this study, hydrothermal carbonization (HTC) at five temperatures (180, 200, 220, 240, and 260 C) was applied to transform Paulownia leaves (PL) into a carbonaceous sorbent of Pb(II) from aqueous solutions. To enhance the adsorption efficiency of the obtained hydrochar (PH), subsequent alkali activation was performed using NaOH. Preliminary results of the Pb(II) adsorption (CPb = 200 mg/L) showed removal coefficients after 48 h of 73.44 mg/g, 82.37 mg/g, and 110.9 mg/g for PL, PH-220, and MPH-220, respectively. The selected hydrochar (PH-220) and modified hydrochar (MPH-220) were further investigated by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results revealed that alkali treatment changed the hydrochar structure and, thus, improved its adsorption performance. The kinetic parameters showed that the Pb(II) sorption onto MPH-220 followed a pseudo-second-order model, while the intra-particle diffusion went through two simultaneous stages. The Langmuir isotherm model best described the experimental data and indicated the value of 174.75 mg Pb(II)/g as the maximum adsorption capacity. The two possible mechanisms of Pb(II) binding were complexation and/or Pb- electron interaction. The obtained results indicate the great potential of MPH-220 for Pb(II) removal from aqueous media and its potential utilization as an effective adsorbent for wastewater purification. PB - Niš : RAD Association T2 - RAD Journal T1 - Effect of KOH activation on hydrochar surface: FT-IR analysis EP - 67 IS - 2 SP - 65 VL - 1 DO - 10.21175/RadJ.2017.01.014 ER -
@article{ author = "Mihajlović, Marija and Petrović, Jelena and Kragović, Milan and Stojanović, Mirjana and Milojković, Jelena and Lopičić, Zorica and Koprivica, Marija", year = "2016", abstract = "In this study, hydrothermal carbonization (HTC) at five temperatures (180, 200, 220, 240, and 260 C) was applied to transform Paulownia leaves (PL) into a carbonaceous sorbent of Pb(II) from aqueous solutions. To enhance the adsorption efficiency of the obtained hydrochar (PH), subsequent alkali activation was performed using NaOH. Preliminary results of the Pb(II) adsorption (CPb = 200 mg/L) showed removal coefficients after 48 h of 73.44 mg/g, 82.37 mg/g, and 110.9 mg/g for PL, PH-220, and MPH-220, respectively. The selected hydrochar (PH-220) and modified hydrochar (MPH-220) were further investigated by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results revealed that alkali treatment changed the hydrochar structure and, thus, improved its adsorption performance. The kinetic parameters showed that the Pb(II) sorption onto MPH-220 followed a pseudo-second-order model, while the intra-particle diffusion went through two simultaneous stages. The Langmuir isotherm model best described the experimental data and indicated the value of 174.75 mg Pb(II)/g as the maximum adsorption capacity. The two possible mechanisms of Pb(II) binding were complexation and/or Pb- electron interaction. The obtained results indicate the great potential of MPH-220 for Pb(II) removal from aqueous media and its potential utilization as an effective adsorbent for wastewater purification.", publisher = "Niš : RAD Association", journal = "RAD Journal", title = "Effect of KOH activation on hydrochar surface: FT-IR analysis", pages = "67-65", number = "2", volume = "1", doi = "10.21175/RadJ.2017.01.014" }
Mihajlović, M., Petrović, J., Kragović, M., Stojanović, M., Milojković, J., Lopičić, Z.,& Koprivica, M.. (2016). Effect of KOH activation on hydrochar surface: FT-IR analysis. in RAD Journal Niš : RAD Association., 1(2), 65-67. https://doi.org/10.21175/RadJ.2017.01.014
Mihajlović M, Petrović J, Kragović M, Stojanović M, Milojković J, Lopičić Z, Koprivica M. Effect of KOH activation on hydrochar surface: FT-IR analysis. in RAD Journal. 2016;1(2):65-67. doi:10.21175/RadJ.2017.01.014 .
Mihajlović, Marija, Petrović, Jelena, Kragović, Milan, Stojanović, Mirjana, Milojković, Jelena, Lopičić, Zorica, Koprivica, Marija, "Effect of KOH activation on hydrochar surface: FT-IR analysis" in RAD Journal, 1, no. 2 (2016):65-67, https://doi.org/10.21175/RadJ.2017.01.014 . .