Carbon Nanotube-Supported Dummy Template Molecularly Imprinted Polymers for Selective Adsorption of Amide Herbicides in Aquatic Products

Abstract

In this study, a carbon nanotube (CNTs)—supported dummy template molecularly imprinted polymer (DMIPs) material was synthesized and utilized for the detection of amide herbicides in aquatic products via matrix solid-phase dispersion technology (MSPD). The DMIPs material was characterized, and its adsorption kinetics and isotherm were determined, the adsorption model was established, and the selective adsorption coefficient was calculated. The extract parameters of the method were optimized and successfully employed for the separation, analysis and detection of real samples, with satisfactory detection limits and linear ranges obtained. By comparing with other methods, the CNTs@DMIPs combined with MSPD technology established in our study can effectively solve false negative problems caused by insufficient destructive force, using dummy template molecules can also address the issue of false positives caused by template molecule leakage in molecular imprinting. Overall, the method is appropriate for the separation and detection of endogenous substances from highly viscous and poorly dispersed samples and is used as a routine detection tool in the aquaculture industry.

Using Magnetic Molecularly Imprinted Polymer Technology for Determination of Fish Serum Glucose Levels

“…The reason for this outcome lies in the introduction of CNTs into our synthesized adsorbent material solely as carriers. CNTs not only enhance the stability of the material but also improve the dispersibility of the adsorbent [ 37 ]. In contrast, when preparing magnetic adsorbent materials using Fe 3 O 4 @SiO 2 as the carrier for adsorbing the glucose molecules, the maximum adsorption capacity obtained was 9.112 μg/mg [ 30 ], which is lower than that observed in our experimental results ( Q max = 262.86 μg/mg).…”

“…The pseudo-second-order model yielded k 2 = 0.00002 g mg −1 min −1 , q e 2 = 278.03 mg/g, and R 2 = 0.323. The pseudo-first-order kinetic model primarily indicates that the adsorption process is controlled by diffusion, and it is a physical adsorption process [ 37 ]. Meanwhile, the pseudo-second-order kinetic model assumes that the adsorption process is chemically controlled through electron sharing or electron transfer between the adsorbent and the adsorbate [ 40 ].…”

“…The pseudo-second-order model yielded k 2 = 0.00002 g mg −1 min −1 , q e2 = 278.03 mg/g, and R 2 = 0.323. The pseudo-first-order kinetic model primarily indicates that the adsorption process is controlled by diffusion, and it is a physical adsorption process [37].…”