Modification of carbon nanotubes with cationic surfactant and its application for removal of direct dyes

Ghobadi, Jalil; Arami, Mokhtar; Bahrami, S. Hajir; Mahmoodi, Niyaz Mohammad

doi:10.1080/19443994.2013.801790

Cited by 23 publications

(13 citation statements)

References 75 publications

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“…The treated CNTs showed higher intensity at 800–2000 cm −1 . These results were similar to those from Shen and Ghobadi and clearly showed that more COOH groups had been attached onto the surface of CNTs.…”

Section: Resultssupporting

confidence: 89%

Effect of carbon nanotube loadings on supercapacitor characteristics

Huang

Kirk

Thorpe

et al. 2014

Int. J. Energy Res.

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SUMMARYIn order to improve the properties of electrodes based on carbon nanotubes (CNTs), nanocomposite electrodes of CNTs/ activated carbon (AC) are prepared. The effect of CNT loadings on the performance of the nanocomposite electrodes is evaluated by electrochemical methods. Scanning electron microscopy images show the CNTs are well dispersed, entwine with the AC, and form a more conductive network in a nanocomposite electrode. When CNT loadings increase from 0 to 10 wt%, the capacitance increases by 15% (89.4 to 102.5 F g À1 ), and the equivalent series resistance (ESR) decreases by 13% (0.93 to 0.81 Ω). The capacitance improvement has an optimum CNT loading of about 6 to 10 wt%. The decreased ESR with high CNT loadings does not prevent capacitance loss at sweep rates greater than 50 mV s À1. The nanocomposite electrode shows good cycle performance with no capacity loss after 5000 cycles at a scan rate of 500 mV s À1 . These results indicate that the CNT-based nanocomposite electrodes would be a promising material for use in supercapacitors. Copyright

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Section: Resultssupporting

confidence: 89%

Effect of carbon nanotube loadings on supercapacitor characteristics

Huang

Kirk

Thorpe

et al. 2014

Int. J. Energy Res.

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“…Therefore, the acute peak at wave number 2839.11 cm −1 , in the FTIR spectra of the AC‐CTABr before and after nitrate adsorption, corresponds to the stretching frequency of tertiary amine group . Furthermore, the band at 2913.15 cm −1 is assigned to the symmetric and asymmetric stretching vibrations of the methyl groups (CH 2 ) .…”

Section: Resultsmentioning

confidence: 98%

Performance of surfactant‐modified activated carbon prepared from dates wastes for nitrate removal from aqueous solutions

Allalou

Miroud

Belmedani

et al. 2018

Env Prog and Sustain Energy

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New material (AC‐CTABr) was successfully prepared from chemical activation of dates wastes (AC), followed by cationic surfactant modification and was used to enhance nitrate removal from aqueous solutions. Brunauer, Emmett and Teller (BET) analysis revealed good binding of quaternary ammonium groups on the surface (1407 m2/g for the AC and 569 m2/g for the AC‐CTABr). Batch experiments were conducted to examine the effect of contact time, solution pH, adsorbent dose, and initial concentration of nitrate. Preliminary results showed an improvement of nitrate removal from 14% to 60% for the AC and the AC‐CTABr, respectively. Also, the adsorption kinetic was very fast; the equilibrium was achieved within the first 5 min of contact time between the adsorbents and the nitrate solution. Application of several isotherm models has shown that Langmuir and Freundlich models described well the experimental data with a maximum adsorption capacity of 83.33 mg/g. Three simplified kinetic models were tested to investigate the adsorption mechanism. The pseudo‐second order model was found to describe adequately the experimental kinetic data. Results showed that the new adsorbent material is a suitable adsorbent for nitrate removal. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S403–S411, 2019

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“…Since the discovery of carbon nanotubes (CNTs) in 1991, they have exhibited potential application in adsorption removal of various pollutants such as metallic ions and synthetic dyes based on their large specific surface area, nanometer size, and hollow-layered [9][10][11][12]. Fagan and his co-workers studied the adsorption of Reactive Blue 4 dye from water solutions by CNTs [13].…”

Section: Introductionmentioning

confidence: 99%

Novel organic dye sorbent: synthesis and adsorption properties of multi-walled carbon nanotubes modified with gallic amide units

Zheng

Guo

Yang

et al. 2015

Desalination and Water Treatment

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A B S T R A C TBy reacting acyl chloride-MWCNTs with gallic amino derivative containing three long alkyl chains, novel gallic-MWCNTs 4 was prepared in good yield. Its structure was characterized by Fourier translation infrared spectroscopy, Raman spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. The gallic derivative content of gallic-MWCNTs was 14.5 wt%. Its adsorption experiments for four cationic and anionic dyes [Orange G sodium salt (OG), Brilliant ponceau 5R (BP), Neutral red (NR), and Methylene blue (MB)] were investigated. The adsorption process attained to adsorption equilibrium in 2.5 h under the condition of 5.0 mg of sorbent in dye solutions (10 mL, 2.0 × 10 −3 M) in the thermostatic shaker bath with a shaking of 200 rpm at 25˚C. The saturated adsorption capabilities were 0.642 mmol/g (289 mg/g), 0.537 mmol/g (324 mg/g), 0.891 mmol/g (256 mg/g), and 0.823 mmol/g (310 mg/g), respectively. The adsorption processes were exothermic and spontaneous, and obeyed pseudo-second-order model and the Langmuir isotherm equation. The adsorption capacities for anionic dyes (OG and BP) decreased with the increase in the pH values of solution and the adsorption capacities for cationic dyes (NR and MB) showed reverse changes.

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Modification of carbon nanotubes with cationic surfactant and its application for removal of direct dyes

Cited by 23 publications

References 75 publications

Effect of carbon nanotube loadings on supercapacitor characteristics

Effect of carbon nanotube loadings on supercapacitor characteristics

Performance of surfactant‐modified activated carbon prepared from dates wastes for nitrate removal from aqueous solutions

Novel organic dye sorbent: synthesis and adsorption properties of multi-walled carbon nanotubes modified with gallic amide units

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