Department

Department of Civil & Architectural Engineering

First Advisor

Dr. Jonathan Brant

Description

Fullerenes, and specifically Buckminsterfullerene (C 60 ), are among the most widely studied types of manufactured nanoparticles in the rapidly expanding field of nanotechnology . Of particular interest are the environmental implications associated with these unique materials and the ability of our water treatment systems to remove them from likely exposure routes (e.g., drinking water). The objective of this study was therefore t o analyze the removal of polyhydroxylated C 60 (fullerols, C 60 OH 18 - 24 ) by coagulation, flocculation and sedimentation processes. These processes generally make up what is referred to as conventional water treatment. Jar tests were performed using a syntheti c source water whose composition was similar to that of typical surface water with regards to electrolyte composition and concentrations, as well as organic content. Fullerol removal efficiency was assessed as a function of the humic acid concentration. Th e highest fullerol removal efficiency measured was approximately 88%, in terms of mass concentration, during coagulation, flocculation and sedimentation processes. However, the removal efficiency decreased as the humic acid concentration in the source wate r increased indicating that the presence of organic material will affect the removal of fullerol by conventional treatment processes.

Comments

Oral Presentation, Wyoming NSF EPSCoR

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Quantifying the Removal and Transformati on of C 60 Nanomaterials During Conventional Water Treatment: Implications for Human Exposure

Fullerenes, and specifically Buckminsterfullerene (C 60 ), are among the most widely studied types of manufactured nanoparticles in the rapidly expanding field of nanotechnology . Of particular interest are the environmental implications associated with these unique materials and the ability of our water treatment systems to remove them from likely exposure routes (e.g., drinking water). The objective of this study was therefore t o analyze the removal of polyhydroxylated C 60 (fullerols, C 60 OH 18 - 24 ) by coagulation, flocculation and sedimentation processes. These processes generally make up what is referred to as conventional water treatment. Jar tests were performed using a syntheti c source water whose composition was similar to that of typical surface water with regards to electrolyte composition and concentrations, as well as organic content. Fullerol removal efficiency was assessed as a function of the humic acid concentration. Th e highest fullerol removal efficiency measured was approximately 88%, in terms of mass concentration, during coagulation, flocculation and sedimentation processes. However, the removal efficiency decreased as the humic acid concentration in the source wate r increased indicating that the presence of organic material will affect the removal of fullerol by conventional treatment processes.