Adsorptive potential of Acacia nilotica based adsorbent for chromium(VI) from an aqueous phase

Raza Khalid, Zaheer Aslam, Aamir Abbas, Waqar Ahmad, Naveed Ramzan, Reyad Shawabkeh

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)


The objective of this research was to enhance adsorption capacity of Acacia nilotica (keekar) sawdust for the abatement of chromium bearing wastewater and to investigate the effect of process parameters on adsorption capacity. The sawdust was activated by acid wash and functionalized subsequently with formaldehyde. Functionalization of activated sawdust raised its chromium removal efficiency of almost 10% as compared to its adsorption removal efficiency of HCl treated sawdust in a batch adsorption study. Adsorption kinetic data provided better fitting with pseudo second order model. Maximum adsorption capacity calculated through the best fitting Langmuir model was 6.34 mg·g− 1 and 8.2 mg·g− 1 for HCl treated and formaldehyde functionalized sawdust adsorbents, respectively. The adsorption of Cr(VI) was endothermic when studied by varying temperature from 20 °C to 50 °C for both activated and functionalized adsorbents.

Original languageEnglish
Pages (from-to)614-622
Number of pages9
JournalChinese Journal of Chemical Engineering
Issue number3
Publication statusPublished - Mar 2018
Externally publishedYes


  • Acacia nilotica
  • Adsorption
  • Chromium
  • Isotherms
  • Kinetics
  • Thermodynamics

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