Adsorptive removal of polycyclic aromatic hydrocarbons by detritus of green tide algae deposited in coastal sediment
Adsorptive removal of polycyclic aromatic hydrocarbons by detritus of green tide algae deposited in coastal sediment
复制标题
滨海沉积物绿潮藻碎屑吸附去除多环芳烃
DOI：
10.1016/j.scitotenv.2019.03.296
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发表时间：
2019
影响因子：
9.8
通讯作者：
Wu Jun
中科院分区：
文献类型：
--
作者：
Zhang Cui;Lu Jian;Wu Jun
关于在绿潮爆发期间沉积在海岸沉积物中的藻类碎屑存在的情况下吸附去除多环芳烃（PAHs）的资料很少。增生ulva （U.）吸附去除典型多环芳烃。由于藻质碎屑对海岸污染物的生物地球化学循环具有重要意义，因此首次对藻质碎屑进行了研究。结果表明，萘、菲和苯并[a]芘在u上的平衡吸附能力。在初始浓度为10 μg L−1时，增殖质菌分别为1.27、1.97和2.49 mg kg−1。激光共聚焦扫描显微镜原位监测证实了增殖脲对多环芳烃的吸附去除作用。这些多环芳烃的吸附高度依赖于ph值。盐度的增加导致萘的去除率增加，而盐度对菲和苯并[a]芘的去除率影响不大。PAHs去除率与初始浓度呈良好的线性关系（R2≥ 0.9892）。较慢的脱附动力学和较低的脱附率（<16%）表明吸附去除多环芳烃可能对环境有益。这些结果表明，绿潮的发生可以通过沉积在海岸沉积物中的绿潮藻碎屑对多环芳烃的吸附去除，为多环芳烃污染提供一种新的自然修复途径。
Rare information is available on the adsorptive removal of polycyclic aromatic hydrocarbons (PAHs) in the presence of algal detritus deposited in the coastal sediment during the outbreak of the green tide. The adsorptive removal of typical PAHs byUlva prolifera(U.prolifera) detritus was firstly investigated since the algal detritus was of great importance for the biogeochemical cycle of coastal contaminants. The results showed that equilibrium adsorptive capacities of naphthalene, phenanthrene and benzo[a] pyrene on theU.proliferadetritus were 1.27, 1.97, and 2.49 mg kg−1, respectively, at the initial concentration of 10 μg L−1. The in situ monitoring using laser confocal scanning microscopy confirmed the adsorptive removal of PAHs byU.proliferadetritus. The adsorption of these PAHs was highly pH-dependent. The increase in salinity led to the increase in naphthalene removal rate, while the salinity showed scarce influence on the removal of phenanthrene and benzo[a] pyrene. There was a good linear relationship (R2≥ 0.9892) between the removal efficiency of PAHs and the initial concentration of PAHs. Slow desorption kinetics and low desorption rate (<16%) indicated that the adsorptive removal of PAHs could be benign to the environment. These findings demonstrated that the occurrence of green tide could provide a new natural remediation approach for contamination of PAHs through the adsorptive removal by the detritus of green tidal algae deposited in the coastal sediment.