TY - JOUR
T1 - Kinetic simulating of Cr(VI) removal by the waste Chlorella vulgaris biomass
AU - Xie, Youping
AU - Li, Hang
AU - Wang, Xiaowei
AU - Ng, I. Son
AU - Lu, Yinghua
AU - Jing, Keju
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (No. 31071488 ) and the Natural Science Foundation of Fujian Province of China (No. 2011J01058). This work was also supported by the National Natural Science Foundation of China (No. 31071488), the National Marine Commonweal Research Program, China (No. 201205020-2), and the Fundamental Research Funds for the Central Universities, China (No. 201212G004).
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/7
Y1 - 2014/7
N2 - 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).
AB - 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).
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U2 - 10.1016/j.jtice.2014.02.016
DO - 10.1016/j.jtice.2014.02.016
M3 - Article
AN - SCOPUS:84903395789
SN - 1876-1070
VL - 45
SP - 1773
EP - 1782
JO - Journal of the Taiwan Institute of Chemical Engineers
JF - Journal of the Taiwan Institute of Chemical Engineers
IS - 4
ER -