Carbamazepine removal from water by carbon dot-modified magnetic carbon nanotubes

Yanchun Deng, Yong Sik Ok, Dinesh Mohan, Charles U. Pittman, Xiaomin Dou

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Carbon dot- and magnetite-modified magnetic carbon nanotubes (CMNTs) were synthesized and evaluated for carbamazepine removal from water. The adsorbent was characterized by multiple modern surface and microstructure analyzing techniques. CMNTs were composed of three components including carbon dots (CDs), carbon nanotubes (CNTs) and magnetite. CDs and CNTs introduce abundant carboxyl groups onto CMNTs and magnetite allows rapid magnetic separation of the adsorbent realizable after batch adsorption. This adsorbent has a moderately high adsorption capacity of 65 mg-carbamazepine/g-adsorbent at pH 7.0 ± 0.2, which is superior to many reported adsorbents. Carbamazepine was uptaken well in a wide pH range, regardless of the surface charging of CMNTs. Its adsorption on CMNTs was quite fast and reached 80% of removal during the initial 3 h. The mass transfer within CMNTs and the time-dependent utilization, exhaustion and depletion of the adsorption capacity were successfully described using a simplified homogeneous surface diffusion model (HSDM). The surface diffusion coefficients (Ds) rose with increasing initial carbamazepine concentrations. After six regeneration and recycle experiments, the capacity loss of CMNTs was less than 2.2% at the conditions tested. FTIR spectra showed the characteristics of the components. Raman spectra implied a π-π electron donor-acceptor (EDA) interaction during adsorption. This work proposed a method of combining π-bond-rich materials (CNTs and CDs) and magnetite to make separable composite adsorbents with high affinity interactions between carbamazepine and carbon materials. The prepared adsorbent is attractive for carbamazepine removal due to its good performance, moderate cost, ease of separation, and ability to regenerate.

Original languageEnglish
Pages (from-to)434-444
Number of pages11
JournalEnvironmental Research
Volume169
DOIs
Publication statusPublished - 2019 Feb 1

Fingerprint

Carbon Nanotubes
Carbamazepine
Adsorbents
Ferrosoferric Oxide
Carbon
Adsorption
magnetite
adsorption
Water
carbon
Surface diffusion
water
Magnetic separation
Fourier Transform Infrared Spectroscopy
mass transfer
microstructure
regeneration
removal
carbon nanotube
Regeneration

Keywords

  • Adsorption
  • Carbamazepine
  • Carbon dots
  • Intraparticle diffusion
  • Modified carbon nanotubes

ASJC Scopus subject areas

  • Biochemistry
  • Environmental Science(all)

Cite this

Carbamazepine removal from water by carbon dot-modified magnetic carbon nanotubes. / Deng, Yanchun; Ok, Yong Sik; Mohan, Dinesh; Pittman, Charles U.; Dou, Xiaomin.

In: Environmental Research, Vol. 169, 01.02.2019, p. 434-444.

Research output: Contribution to journalArticle

Deng, Yanchun ; Ok, Yong Sik ; Mohan, Dinesh ; Pittman, Charles U. ; Dou, Xiaomin. / Carbamazepine removal from water by carbon dot-modified magnetic carbon nanotubes. In: Environmental Research. 2019 ; Vol. 169. pp. 434-444.
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