Journal
POLISH JOURNAL OF ENVIRONMENTAL STUDIES
Volume 27, Issue 6, Pages 2851-2859Publisher
HARD
DOI: 10.15244/pjoes/83666
Keywords
sulfate-reducing bacteria; immobilization; cadmium; adsorption; heavy metals
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Funding
- National Natural Science Foundation [51208122, 41372248, 51778156, 51708142]
- New Technological Star Project of Pearl River [2011061]
- Science and Technology Program of Guangzhou, a high-level university construction project [201707010256]
- Significant Innovation Project of the Bureau of Guangzhou Municipality [13XT02]
- Foundation for Fostering the Scientific and Technical Innovation of Guangzhou University
- Department of education of Guangdong Province [2015KQNCX115]
- Guangzhou Education Bureau [1201630390]
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Immobilized sulfate-reducing bacteria (SRB) in polyvinyl alcohol (PVA)-sodium alginate matrix were applied as biosorbents to remove cadmium (Cd) from aqueous solutions. Multiple characterization techniques including scanning electron microscope (SEM)-energy dispersive spectrometer (EDS), and Fourier transform infrared (FT-IR) spectra indicate that immobilized beads provided a suitable microenvironment for SRB. Performance tests show that Cd removal was highly affected by pH value and temperature, with optimum temperature at 35 degrees C and pH value of 8.0. A pseudo second-order model was applied to describe the adsorption kinetic. FT-IR and x-ray photoelectron spectroscopy (XPS) analyses imply that biosorption, sulfide, and hydroxide precipitation are the main mechanisms for removing Cd. The immobilized SRB beads have great potential for remediating Cd-containing wastewater.
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