TY - JOUR
T1 - Role of biogenic sulfide in attenuating zinc oxide and copper nanoparticle toxicity to acetoclastic methanogenesis
AU - Gonzalez-Estrella, Jorge
AU - Puyol, Daniel
AU - Sierra-Alvarez, Reyes
AU - Field, Jim A.
N1 - Funding Information:
This work was supported by the Semiconductor Research Corporation (SRC)/ Sematech Engineering Research Center for Environmentally Benign Semiconductor Manufacturing. Gonzalez-Estrella was partly funded by CONACyT .
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - Soluble ions released by zinc oxide (ZnO) and copper (Cu0) nanoparticles (NPs) have been associated with toxicity to methanogens. This study evaluated the role of biogenic sulfide in attenuating ZnO and Cu0 NP toxicity to methanogens. Short- and long-term batch experiments were conducted to explore ZnO and Cu0 NPs toxicity to acetoclastic methanogens in sulfate-containing (0.4mM) and sulfate-free conditions. ZnO and Cu0 were respectively 14 and 7-fold less toxic in sulfate-containing than in sulfate-free assays as indicated by inhibitory constants (Ki). The Ki with respect to residual soluble metal indicated that soluble metal was well correlated with toxicity irrespective of the metal ion source or presence of biogenic sulfide. Long-term assays indicated that ZnO and Cu0 NPs caused different effects on methanogens. ZnO NPs without protection of sulfide caused a chronic effect, whereas Cu0 NPs caused an acute effect and recovered. This study confirms that biogenic sulfide effectively attenuates ZnO and Cu0 NPs toxicity to methanogens by the formation of metal sulfides.
AB - Soluble ions released by zinc oxide (ZnO) and copper (Cu0) nanoparticles (NPs) have been associated with toxicity to methanogens. This study evaluated the role of biogenic sulfide in attenuating ZnO and Cu0 NP toxicity to methanogens. Short- and long-term batch experiments were conducted to explore ZnO and Cu0 NPs toxicity to acetoclastic methanogens in sulfate-containing (0.4mM) and sulfate-free conditions. ZnO and Cu0 were respectively 14 and 7-fold less toxic in sulfate-containing than in sulfate-free assays as indicated by inhibitory constants (Ki). The Ki with respect to residual soluble metal indicated that soluble metal was well correlated with toxicity irrespective of the metal ion source or presence of biogenic sulfide. Long-term assays indicated that ZnO and Cu0 NPs caused different effects on methanogens. ZnO NPs without protection of sulfide caused a chronic effect, whereas Cu0 NPs caused an acute effect and recovered. This study confirms that biogenic sulfide effectively attenuates ZnO and Cu0 NPs toxicity to methanogens by the formation of metal sulfides.
KW - Anaerobic digestion
KW - Elemental copper and zinc oxide nanoparticles
KW - Inhibition
KW - Sulfate-reduction
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U2 - 10.1016/j.jhazmat.2014.10.030
DO - 10.1016/j.jhazmat.2014.10.030
M3 - Article
C2 - 25464319
AN - SCOPUS:84909942615
SN - 0304-3894
VL - 283
SP - 755
EP - 763
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -