Metal diffusion properties of a Nafion-coated porous membrane in an aquatic passive sampler system

Abstract

A cellulose acetate membrane, positioned in a passive sampler system, was coated with the perfluorinated polymer Nafion. Aqueous metal transport through the membrane and the Nafion film was investigated. The Nafion-coated membrane prevents the transport of metals bound to natural organic material to the receiving phase in the passive sampler, while copper associated with small synthetic ligands pass through the Nafion film. Increasing thickness of the Nafion film decreases the metal uptake rate to the receiving phase in the passive sampler and increases the response time. A decreased response time for the passive sampler would provide a better estimation of rapid changes in concentration, particularly for dynamic aquatic systems such as urban runoff. Limited biofouling protection with the Nafion coating was demonstrated by growth inhibition of natural periphyton communities on glass surfaces.

Ti3C2Tx Coated with TiO2 Nanosheets for the Simultaneous Detection of Ascorbic Acid, Dopamine and Uric Acid

“…There are several key advantages in our work: Firstly, our synthesis method is simple, and the preparation conditions are gentle, in contrast to the complex synthesis processes and high-temperature preparation conditions commonly found in the existing literature [ 37 , 38 , 39 ]. Secondly, our use of non-precious metals is more cost-effective than the use of precious metals; even though precious metals can enhance material sensitivity, they also escalate manufacturing costs [ 40 , 41 ]. Materials such as MXene and TiO 2 present a promising low-cost alternative.…”

“…Consequently, the peaks corresponding to AA and UA resurfaced during simultaneous detection. Based on previous studies [40,41], simultaneous detection of AA/DA/UA faces significant challenges due to mutual interference, such as strong electrostatic interactions and overlapping oxidation potentials [36,38,53]. Through the solvothermal process, Ti 3 C 2 T x @TiO 2 NSs exhibit two distinct advantages that enhance their ability to detect these molecules simultaneously.…”