Abstract
Carbon nanotubes could accumulate in organism and have a negative impact on the structure and function of the ecosystem when they were discharged into environment. Furthermore, it will affect the migration and fate of pollutants in the water body. The study is mainly to explore the adsorption behavior and mechanism of beta-blocker on multi-walled carbon nanotubes (MWCNTs). Propranolol (PRO) was selected as the representative of beta-blocker. The effects of different environmental factors such as pH, ionic strength and humic acid (HA) on the adsorption process were investigated. The adsorption results were characterized by Zeta potential. At the same time, the effects of different types of drugs on the adsorption process were explored and the possible adsorption mechanisms were analyzed. The experimental results showed that the adsorption behavior was significantly different under different pH conditions. π-π EDA interaction, hydrophobic interaction and hydrogen bonding were speculated to be the main adsorption mechanisms for PRO adsorption on MWCNTs.
Highlights
Carbon nanotubes could accumulate in organism and have a negative impact on the structure and function of the ecosystem when they were discharged into environment
CNTs are classified into single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs)
MWCNTs were selected as the research object because MWCNTs are easy to form depressions between layers when they are formed compared with SWCNTs
Summary
Carbon nanotubes could accumulate in organism and have a negative impact on the structure and function of the ecosystem when they were discharged into environment It will affect the migration and fate of pollutants in the water body. The study is mainly to explore the adsorption behavior and mechanism of beta-blocker on multi-walled carbon nanotubes (MWCNTs). More attention should be paid to the adsorption behavior of CNTs. Based on the interaction between CNTs and contaminants including heavy metals, antibiotics, and pesticides, some studies have pointed out that CNTs are important carriers or adsorbents to affect the migration and transformation of pollutants. Beta-blockers are widely used to treat cardiovascular diseases, which that existed as parent compound cannot be completely removed by a sewage treatment plant, resulting in residues in natural waters, which have adversely affect organisms even at low concentrations[21,22,23,24].
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