Carbon Nanotube Properties Influence Adsorption of Phenanthrene and Subsequent Bioavailability and Toxicity to Pseudokirchneriella subcapitata

Environmental Science & Technology
Berit GlomstadAndy M Booth

Abstract

The bioavailability of organic contaminants adsorbed to carbon nanotubes (CNTs) remains unclear, especially in complex natural freshwaters containing natural organic matter (NOM). Here, we report on the adsorption capacity (Q(0)) of five CNTs exhibiting different physicochemical properties, including a single-walled CNT (SWCNTs), multiwalled CNTs (MWCNT-15 and MWCNT-30), and functionalized MWCNTs (hydroxyl, -OH, and carboxyl, -COOH), for the model polycyclic aromatic hydrocarbon phenanthrene (3.1-800 μg/L). The influence of phenanthrene adsorption by the CNTs on bioavailability and toxicity was investigated using the freshwater algae Pseudokirchneriella subcapitata. CNTs were dispersed in algal growth media containing NOM (DOC, 8.77 mg/L; dispersed concentrations: 0.5, 1.3, 1.3, 3.3, and 6.1 mg/L for SWCNT, MWCNT-15, MWCNT-30, MWCNT-OH, and MWCNT-COOH, respectively). Adsorption isotherms of phenanthrene to the dispersed CNTs were fitted with the Dubinin-Ashtakhov model. Q(0) differed among the CNTs, increasing with increasing surface area and decreasing with surface functionalization. SWCNT and MWCNT-COOH exhibited the highest and lowest log Q(0) (8.891 and 7.636 μg/kg, respectively). The presence of SWCNTs reduced phenanthrene...Continue Reading

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Citations

Dec 29, 2017·Environmental Science and Pollution Research International·Zhenhua YanGuanghua Lu
Feb 15, 2018·International Journal of Environmental Research and Public Health·Pratap C NahaHugh J Byrne
Jun 28, 2019·Toxicology and Industrial Health·Mansour Rezazadeh AzariAthena Rafieepour
Aug 20, 2017·Environmental Science and Pollution Research International·Berit GlomstadAndy M Booth
Apr 30, 2020·International Journal of Environmental Research and Public Health·Wei ZhangZhongyi Wei
Mar 18, 2019·Environmental Science and Pollution Research International·Mansour Rezazadeh AzariAthena Rafieepour
Jun 12, 2019·Environmental Science and Pollution Research International·Wei ZhangHui Zeng
Nov 14, 2020·Analytical Methods : Advancing Methods and Applications·Lorena González-LegarretaMónica L Fanarraga
Nov 12, 2020·International Journal of Environmental Research and Public Health·Maqusood AhamedM A Majeed Khan
Mar 30, 2021·Environmental Science and Pollution Research International·Guobin SongGuanghui Ding

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