Studies on the sorption behaviors of phenanthrene on marine sediments

Abstract

In the present study, the sorption behaviors of phenanthrene on marine sediments were investigated. Through the study of the adsorption kinetics and isotherms, the adsorption mechanism of phenanthrene on marine sediments was described. The results showed that the adsorption kinetics of phenanthrene on marine sediments could be described by the second-order kinetic equation. The sorption rate of phenanthrene was very rapid, and the equilibrium time was slightly longer in deionized water than in natural seawater. The adsorption isotherms of phenanthrene on all the sediments could be very well described by Freundlich equations. The adsorption capacity of phenanthrene had a significant positive correlation with the sediment organic carbon content. Some external factors that could affect adsorption behaviors of phenanthrene were also investigated. Results of the present study showed that the adsorption capacity of phenanthrene on the sediment decreased with increasing temperature. Moreover, the adsorption amounts of phenanthrene on the sediment appeared to be lower in natural seawater than in deionized water. Finally, the presence of the surfactant of Tween20 in the system could enhance the adsorption of phenanthrene on the sediment, and the adsorbance was proportional to the concentration of Tween20.

Transport of persistent organic pollutants by microplastics in estuarine conditions

“…Sorption behaviour of POPs onto polymers can be compared to sorption onto sediments following a dual-mode model comprising a partitioning and adsorption domain due to the presence of soil organic matter (SOM) (Xing and Pignatello, 1997;Xing et al, 1996;Zhao et al, 2002). However, the effects of salinity appear to be different for marine sediments probably due to the presence of organic carbon which showed a positive correlation between Phe sorption onto sediments and the organic carbon content (Brunk et al, 1996;Yang and Zheng, 2010). Indeed, the sorption behaviour of phenanthrene on marine sediments, showed that the initial rate and equilibrium rate constant of adsorption increased with an increase in salinity (Yang and Zheng, 2010).…”

“…However, the effects of salinity appear to be different for marine sediments probably due to the presence of organic carbon which showed a positive correlation between Phe sorption onto sediments and the organic carbon content (Brunk et al, 1996;Yang and Zheng, 2010). Indeed, the sorption behaviour of phenanthrene on marine sediments, showed that the initial rate and equilibrium rate constant of adsorption increased with an increase in salinity (Yang and Zheng, 2010). Another study by Xu et al (2009) showed that sorption of benzyl butyl phthalate (BBP) on the sediments also increased with salinity.…”

Sorption of pharmaceuticals and personal care products to polyethylene debris

“…3, increase of salinity from 0.05 to 3.5 % (from freshwater to saline water) did not significantly affect the sorption of 4MBC, CBZ, and EE2, whereas the sorption capacity of TCS increased gradually with the increase of salinity. Increase of salinity can reduce solubility (known as salting-out effect) and thus enhance the sorption of organic compounds, which was observed in marine sediments (Soubaneh et al 2014;Xu and Li 2009;Yang and Zheng 2010). Increased sorption of TCS at higher salinity levels might be related to the salting-out effect.…”

Aliphatic Polyester-Based Biodegradable Microbeads for Sustainable Cosmetics

“…Because of its hydrophobic structure, it was hardly dissolved in water (solubility = 1.20 mg/L at 25 °C). Therefore, ethanol was added into seawater to increase the solubility of phenanthrene. , First, phenanthrene (1.5 mg) was dissolved in an ethanol/seawater mixture (2/8, v/v, 30 mL), and then 50 mg of MBs was added into the mixture. The cumulative adsorption amounts of phenanthrene onto each type of MB were analyzed using a UV–visible spectrophotometer (UV-2450, SHIMADZU, Japan).…”