Examination of Pb2+ bio-sorption onto Rhodotorula mucilaginosa using response surface methodology.
With the rapid industrial development, wastewater has been a risk for environmental contamination. We aimed to explore the optimum condition and mechanism of Pb2+ bio-sorption onto Rhodotorula mucilaginosa WT6-5. Optimization of initial concentration of Pb2+, initial pH, and adsorption time for Pb2+ bio-sorption onto R. mucilaginosa WT6-5 was performed using response surface methodology. Field emission scanning electron microscopy, energy dispersive X-ray detection, X-ray fluorescence and Fourier transform infrared spectroscopy were used to analyze the mechanisms and characteristics of Pb2+ bio-sorption. A maximum Pb2+ bio-sorption capacity of 1.45 mg/g was obtained under the optimal conditions of initial concentration of Pb2+ (30 mg/L), initial pH (5.45) and adsorption time (25 minutes). Some Pb2+ remained after adsorption, and the -OH, -C=O and C-O functional groups were primarily involved in Pb2+ bio-sorption onto R. mucilaginosa WT6-5. The mechanism of Pb2+ bio-sorption involved chemical and biological actions, ion exchange and functional groups effects.
College of Resources and Civil Engineering, Northeastern University, No. 11 Lane 3, Wenhua Road, Heping District, Shenyang 110819, China E-mail: j_binhui@163.com.
Bin-hui
BH
Jiang
College of Resources and Civil Engineering, Northeastern University, No. 11 Lane 3, Wenhua Road, Heping District, Shenyang 110819, China E-mail: j_binhui@163.com.
Yan
Y
Zhao
College of Resources and Civil Engineering, Northeastern University, No. 11 Lane 3, Wenhua Road, Heping District, Shenyang 110819, China E-mail: j_binhui@163.com.
Xin
X
Zhao
College of Resources and Civil Engineering, Northeastern University, No. 11 Lane 3, Wenhua Road, Heping District, Shenyang 110819, China E-mail: j_binhui@163.com.
Xiao-min
XM
Hu
College of Resources and Civil Engineering, Northeastern University, No. 11 Lane 3, Wenhua Road, Heping District, Shenyang 110819, China E-mail: j_binhui@163.com.
Li
L
Li
D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D007854:Lead / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D012248:Rhodotorula / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013223:Statistics as Topic; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D007854:Lead; D062065:Wastewater; D014874:Water Pollutants, Chemical