Kinetic simulating of Cr(VI) removal by the waste Chlorella vulgaris biomass

Youping Xie, Hang Li, Xiaowei Wang, I. Son Ng, Yinghua Lu, Keju Jing

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Waste microalgae biomass, one of the most abundant residues from biodiesel production, can be used as a low-cost biosorbent for heavy metal removal. The ability and mechanism of Cr(VI) removal by lipid-extraction residue of Chlorella vulgaris were investigated in this study. The removal of Cr(VI) increased as the pH decreased from 4.0 to 0.5, or temperature increased from 15. °C to 45. °C. The Sips isotherm well-fitted the experiment data, and the maximal biosorption capacity of waste C. vulgaris biomass for total chromium was 43.3. mg/g at pH 1.5 and a temperature of 25. °C. X-ray photoelectron spectroscopy revealed that the majority of Cr(VI) bound on the biomass was reduced to Cr(III) with its subsequent partial biosorption. The results of Fourier Transform Infrared Spectrometer study indicated that both carboxyl and amino groups on the biomass were the main binding sites for Cr(VI) biosorption, while carbohydrate was mainly responsible for reduction of Cr(VI). Finally, the proposed kinetic model based on the indirect reduction mechanism well described the Cr(VI) removal behavior at various pHs (0.5-2) and temperatures (15-45. °C).

Original languageEnglish
Pages (from-to)1773-1782
Number of pages10
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume45
Issue number4
DOIs
Publication statusPublished - 2014 Jul

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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