Simultaneous and efficient removal of Cr(VI) and methyl orange on LDHs decorated porous carbons

Shixia Chen, Yifeng Huang, Xinxin Han, Zeliang Wu, Cen Lai, Jun Wang, Qiang Deng, Zheling Zeng, Shuguang Deng

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Layered double hydroxides (LDHs) are currently attracting intense research interests as pollutant adsorbent due to its low cost, non-toxicity, structure amenability and anion exchange capability. Herein, 3-dimensional (3D) flower-like Ni/Al LDH were prepared to decorate H3PO4 activated biomass-derived porous carbons (PAB) via a facile and green hydrothermal method. The as-synthesized nanocomposites (Ni/Al@PAB) displayed favorable removal performance towards both Cr(VI) and methyl orange (MO) from aqueous solution due to the inherited excellent Cr(VI) removal ability from PAB and MO removal ability from Ni/Al LDH. In single-component removal system, the maximum adsorption capacity of 271.5 and 412.8 mg/g for Cr(VI) and MO were achieved on Ni/Al@PAB, respectively. Remarkably, the removal capacity of Cr(VI) and MO both increased in the Cr(VI)–MO binary system due to the synergistic effect including, (i) additional adsorption sites of N-containing groups from MO, (ii) electrostatic interactions by the reduced Cr(III), and (iii) mutual thermal compensation in the binary system. This work paved the way for designing novel LDHs-decorated porous carbon adsorbents and revealed that the acicular Ni/Al LDH decorated PAB could be applied as efficient and simultaneous adsorbent for coexisting toxic pollutants situations.

Original languageEnglish (US)
Pages (from-to)306-315
Number of pages10
JournalChemical Engineering Journal
Volume352
DOIs
StatePublished - Nov 15 2018

Fingerprint

Hydroxides
hydroxide
Carbon
Adsorbents
carbon
adsorption
Adsorption
pollutant
Coulomb interactions
Poisons
ion exchange
Ion exchange
Nanocomposites
flower
Biomass
Negative ions
aqueous solution
Anions
chromium hexavalent ion
methyl orange

Keywords

  • Biomass-derived carbons
  • Cr (VI)
  • Layered double hydroxide (LDH)
  • Methyl orange (MO)
  • Simultaneous removal

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Simultaneous and efficient removal of Cr(VI) and methyl orange on LDHs decorated porous carbons. / Chen, Shixia; Huang, Yifeng; Han, Xinxin; Wu, Zeliang; Lai, Cen; Wang, Jun; Deng, Qiang; Zeng, Zheling; Deng, Shuguang.

In: Chemical Engineering Journal, Vol. 352, 15.11.2018, p. 306-315.

Research output: Contribution to journalArticle

Chen, Shixia ; Huang, Yifeng ; Han, Xinxin ; Wu, Zeliang ; Lai, Cen ; Wang, Jun ; Deng, Qiang ; Zeng, Zheling ; Deng, Shuguang. / Simultaneous and efficient removal of Cr(VI) and methyl orange on LDHs decorated porous carbons. In: Chemical Engineering Journal. 2018 ; Vol. 352. pp. 306-315.
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AB - Layered double hydroxides (LDHs) are currently attracting intense research interests as pollutant adsorbent due to its low cost, non-toxicity, structure amenability and anion exchange capability. Herein, 3-dimensional (3D) flower-like Ni/Al LDH were prepared to decorate H3PO4 activated biomass-derived porous carbons (PAB) via a facile and green hydrothermal method. The as-synthesized nanocomposites (Ni/Al@PAB) displayed favorable removal performance towards both Cr(VI) and methyl orange (MO) from aqueous solution due to the inherited excellent Cr(VI) removal ability from PAB and MO removal ability from Ni/Al LDH. In single-component removal system, the maximum adsorption capacity of 271.5 and 412.8 mg/g for Cr(VI) and MO were achieved on Ni/Al@PAB, respectively. Remarkably, the removal capacity of Cr(VI) and MO both increased in the Cr(VI)–MO binary system due to the synergistic effect including, (i) additional adsorption sites of N-containing groups from MO, (ii) electrostatic interactions by the reduced Cr(III), and (iii) mutual thermal compensation in the binary system. This work paved the way for designing novel LDHs-decorated porous carbon adsorbents and revealed that the acicular Ni/Al LDH decorated PAB could be applied as efficient and simultaneous adsorbent for coexisting toxic pollutants situations.

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