Influence of single-walled carbon nanotubes on microbial availability of phenanthrene in sediment
Influence of single-walled carbon nanotubes on microbial availability of phenanthrene in sediment
复制标题
单壁碳纳米管对沉积物中菲微生物有效性的影响
DOI：
10.1007/s10646-011-0684-3
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发表时间：
2011-08-01
期刊：
影响因子：
2.7
通讯作者：
Gan, J.
中科院分区：
文献类型：
--
作者：
Cui, X. Y.;Jia, F.;Gan, J.
增加单壁碳纳米管（SWCNT）的生产和使用将不可避免地导致这些纳米颗粒释放到水生生态系统中。与黑碳（BC）颗粒相似，SWCNT对疏水有机污染物（HOCs）具有高亲和力，因此沉积物中SWCNT的存在可能导致HOCs的生物利用度改变。我们比较了单壁碳纳米管与生物炭和木炭对0.05 mg kg− 114 C-菲（PHE）的微生物降解性的影响，通过在两个具有不同有机碳（OC）含量的沉积物中的分枝杆菌vanbaaleniiPYR-1。当SWCNT或BC的修正率为1 mg g−1时，SWCNT对PHE矿化的抑制作用比生物炭或木炭更显著。经过360小时的培养，在单壁碳纳米管的存在下，PHE的矿化分数是59.5%的未修正的控制在沉积物中具有低的OC含量，只有42.4%，在其他沉积物中具有较高的OC含量。使用一次性聚二甲基硅氧烷（PDMS）纤维的自由溶解浓度（Cfree）的分析表明，SWCNT减少Cfree的85- 95%，显然是由于优先吸附PHE的SWCNT颗粒，具有比生物炭或木炭大得多的比表面积和孔体积。然而，与溶解的有机质（蛋白胨，单宁酸，腐殖酸）的SWCNT的预相互作用导致极性官能团的连接和减少的表面积，导致减少PHE吸附和减轻对PHE的生物降解的顺序为蛋白胨>单宁酸>腐殖酸。
Increasing production and use of single-walled carbon nanotubes (SWCNT) will inevitably lead to release of these nanoparticles to aquatic ecosystems. Similar to black carbon (BC) particles, SWCNT have a high affinity for hydrophobic organic contaminants (HOCs) and therefore the presence of SWCNT in sediment may lead to altered bioavailability of HOCs. We compared SWCNT with biochar and charcoal on their effect on the microbial degradability of 0.05 mg kg−114C-phenanthrene (PHE) byMycobacterium vanbaaleniiPYR-1 in two sediments with different organic carbon (OC) contents. When the amendment rate of SWCNT or BC was 1 mg g−1, PHE mineralization was inhibited much more significantly by SWCNT than by either biochar or charcoal. After 360 h of incubation, the mineralized fraction of PHE in the presence of SWCNT was 59.5% of the non-amended control in the sediment with low OC content, and only 42.4% in the other sediment with a higher OC content. Analysis of the freely dissolved concentration (Cfree) using disposable polydimethylsiloxane (PDMS) fibers showed that SWCNT decreasedCfreeby 85–95%, apparently due to preferential sorption of PHE to SWCNT particles that had a much larger specific surface area and pore volume than biochar or charcoal. However, pre-interaction of SWCNT with dissolved organic matter (peptone, tannic acid, and humic acid) led to attachment of polar functional groups and reduced surface area on SWCNT, resulting in decreased PHE sorption and an alleviated effect on PHE biodegradation in the order of peptone > tannic acid > humic acid.