The removal of lead ions from aqueous solutions by modified multi-walled carbon nanotubes with 1-isatin-3-thiosemicarbazone

A novel multi-walled carbon nanotubes (MWCNTs) material functionalized with thiosemicarbazide was synthesized successfully and used to remove lead ions from aqueous solutions. The technologies of Fourier Transform Infrared Spectroscopy, scanning electron microscopy and thermal gravimetric analysis were used to characterize the structure and properties of thiosemicarbazide grafted MWCNTs. The adsorption conditions, such as pH, contact time and temperature, were investigated. The results showed pH affected the adsorption process greatly, and the adsorption process reached equilibrium within 60 min. The maximum adsorption capacity was 42.01 mg/g. The adsorption process fitted well with the pseudo-second-order kinetic model and the Langmuir model. The thermodynamic parameters indicated the adsorption process was endothermic and spontaneous in nature.

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Comparison of LSSVM and RSM in simulating the removal of ciprofloxacin from aqueous solutions using magnetization of functionalized multi-walled carbon nanotubes: Process optimization using GA and RSM techniques

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105677 ◽

2021 ◽

pp. 105677

Author(s):

Mahmood Yousefi ◽

Mitra Gholami ◽

Vahide Oskoei ◽

Ali Akbar Mohammadi ◽

Mansour Baziar ◽

...

Keyword(s):

Carbon Nanotubes ◽

Aqueous Solutions ◽

Process Optimization ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Kinetics and thermodynamics of the sorption of furaltadone from aqueous solutions on magnetic multi-walled carbon nanotubes

Water Science & Technology ◽

10.2166/wst.2014.313 ◽

2014 ◽

Vol 70 (6) ◽

pp. 964-971

Author(s):

Xu Chen ◽

Zhen-hu Xiong

Keyword(s):

Carbon Nanotubes ◽

Aqueous Solutions ◽

Sorption Data ◽

Multi Wall Carbon Nanotubes ◽

Adsorption Behaviors ◽

Different Temperatures ◽

Multi Walled Carbon Nanotubes ◽

Pseudo Second Order ◽

Experimental Data Analysis ◽

Walled Carbon Nanotubes

Magnetic multi-wall carbon nanotubes (M-MWCNTs) were used as an adsorbent for removal of furaltadone from aqueous solutions, and the adsorption behaviors were investigated by varying pH, sorbent amount, sorption time and temperature. The results showed that the adsorption efficiency of furaltadone reached 97% when the dosage of M-MWCNT was 0.45 g · L−1, the pH was 7 and the adsorption time was 150 min. The kinetic data showed that the pseudo-second-order model can fit the adsorption kinetics. The sorption data could be well explained by the Langmuir model under different temperatures. The adsorption process was influenced by both intraparticle diffusion and external mass transfer. The experimental data analysis indicated that the electrostatic attraction and π–π stacking interactions between M-MWCNT and furaltadone might be the adsorption mechanism. Thermodynamic analysis reflected that adsorption of furaltadone on the M-MWCNT was spontaneous and exothermic. Our study showed that M-MWCNTs can be used as a potential adsorbent for removal of furaltadone from water and wastewater.

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