TY - JOUR
T1 - Effective and fast adsorptive removal of toxic cationic dye (MB) from aqueous medium using amino-functionalized magnetic multiwall carbon nanotubes
AU - Ahamad, Tansir
AU - Naushad, Mu
AU - Eldesoky, Gaber E.
AU - Al-Saeedi, Sameerah I.
AU - Nafady, Ayman
AU - Al-Kadhi, Nada S.
AU - Al-Muhtaseb, Ala'a H.
AU - Khan, Azmat Ali
AU - Khan, Aslam
N1 - Funding Information:
The authors extend their appreciation to the Deanship of Scientific Research at King Saud University for funding this work through research group no RGP-130. The work was also funded by the Deanship of Scientific Research at Princess Nourah Bint Abdulrahman University through the Research Groups program, grant no. RGP-1438-0005.
Funding Information:
The authors extend their appreciation to the Deanship of Scientific Research at King Saud University for funding this work through research group no RGP-130 . The work was also funded by the Deanship of Scientific Research at Princess Nourah Bint Abdulrahman University through the Research Groups program, grant no. RGP-1438-0005 .
Publisher Copyright:
© 2019
PY - 2019/5/15
Y1 - 2019/5/15
N2 - Amino functionalized multi-walled carbon nanotubes (NH 2 -MWCNTs) were prepared via chemical modification of the surface of multiwall carbon nanotubes. The magnetic nanoparticles (Fe 3 O 4 ) were embedded with NH 2 -MWCNTs and the developed magnetic carbon nanotube (NH 2 -MWCNTs@Fe 3 O 4 ) were characterized via several analytical techniques including FT-IR, Raman, XRD, TEM, SAED, SEM, BET and VSM. The fabricated NH 2 -MWCNTs@Fe 3 O 4 was used for the removal of toxic methylene blue dye (MB) from aqueous medium. The results of VSM indicated that the fabricated NH 2 -MWCNTs@Fe 3 O 4 had magnetic nature and the saturated magnetization was 37.91 emu/g. The effect of initial solution pH, temperature and contact time on MB adsorption was also investigated. The results of adsorption kinetics exhibited that the adsorption followed the linear pseudo-second-kinetic model well. Langmuir and Freundlich isotherm models were applied to understand the adsorption behaviors. The maximum adsorption capacity from the Langmuir isotherm equation reached 178.5 mg g −1 indicated that it was a good adsorbent for MB removal. The thermodynamics parameters such as Gibbs free energy (ΔG 0 ), enthalpy (ΔH 0 ) and entropy (ΔS 0 ), supported the spontaneous and exothermic nature of adsorption. It was noted that after six repetitive cycles, the adsorption capacity of NH 2 -MWCNTs@Fe 3 O 4 was 80% of the original value. Hence, it can be concluded that NH 2 -MWCNTs@Fe 3 O 4 had substantial reusability which made it an economical adsorbent for MB removal from aqueous medium.
AB - Amino functionalized multi-walled carbon nanotubes (NH 2 -MWCNTs) were prepared via chemical modification of the surface of multiwall carbon nanotubes. The magnetic nanoparticles (Fe 3 O 4 ) were embedded with NH 2 -MWCNTs and the developed magnetic carbon nanotube (NH 2 -MWCNTs@Fe 3 O 4 ) were characterized via several analytical techniques including FT-IR, Raman, XRD, TEM, SAED, SEM, BET and VSM. The fabricated NH 2 -MWCNTs@Fe 3 O 4 was used for the removal of toxic methylene blue dye (MB) from aqueous medium. The results of VSM indicated that the fabricated NH 2 -MWCNTs@Fe 3 O 4 had magnetic nature and the saturated magnetization was 37.91 emu/g. The effect of initial solution pH, temperature and contact time on MB adsorption was also investigated. The results of adsorption kinetics exhibited that the adsorption followed the linear pseudo-second-kinetic model well. Langmuir and Freundlich isotherm models were applied to understand the adsorption behaviors. The maximum adsorption capacity from the Langmuir isotherm equation reached 178.5 mg g −1 indicated that it was a good adsorbent for MB removal. The thermodynamics parameters such as Gibbs free energy (ΔG 0 ), enthalpy (ΔH 0 ) and entropy (ΔS 0 ), supported the spontaneous and exothermic nature of adsorption. It was noted that after six repetitive cycles, the adsorption capacity of NH 2 -MWCNTs@Fe 3 O 4 was 80% of the original value. Hence, it can be concluded that NH 2 -MWCNTs@Fe 3 O 4 had substantial reusability which made it an economical adsorbent for MB removal from aqueous medium.
KW - Adsorption
KW - Amino functionalized
KW - MB dye
KW - Multi-walled carbon nanotubes
UR - http://www.scopus.com/inward/record.url?scp=85062499112&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85062499112&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2019.02.128
DO - 10.1016/j.molliq.2019.02.128
M3 - Article
AN - SCOPUS:85062499112
SN - 0167-7322
VL - 282
SP - 154
EP - 161
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
ER -