Facile synthesis of self-assembled carbon nanotubes/dye composite films for sensitive electrochemical determination of Cd(II) ions

Abstract

A new type of voltammetric sensor material has been fabricated via a facile self-assembled method. A modified glassy carbon electrode (GCE) by phenylsulfonic groups grafted multi-walled carbon nanotubes (CNT-SOH) with dye molecules via Langmuir-Blodgett (LB) assembling (CNT-SOH/dye-LB/GCE) were prepared for detecting trace levels of cadmium (Cd) ions by square wave anodic stripping voltammetry. The synergy effect between CNT-SOH and dye as well as orderly aggregates in composite LB films contributed to greatly enhancing the determination performance. Under selected conditions, voltammetric response of the fabricated electrochemical sensor in 0.1 M acetate buffer solution containing Bi ions for Cd ions was linear with its concentration in the range 0.1 to 1.2 μM, with a detection limit of 0.08 μM. In addition, the preparation process of self-assembled composite film modified electrodes was simple, non-toxic, exhibiting higher sensitivity and potential application prospects in aspects of heavy metal ions detection and environmental analysis.

Facile solvothermal preparation of Fe3O4–Ag nanocomposite with excellent catalytic performance

“…The saturation magnetization of the prepared Fe 3 O 4 nanoparticles was 83.0 emu g À1 , which is more than the values reported for other pure Fe 3 O 4 nanocrystals. [56][57][58][59] In addition, the saturation magnetization value of the Fe 3 O 4 -Ag nanocomposite was 63.2 emu g À1 . These results indicate the successful preparation of the Fe 3 O 4 -Ag nanocomposite with a coating of Ag nanowires.…”

Facile Preparation of Rod-like MnO Nanomixtures via Hydrothermal Approach and Highly Efficient Removal of Methylene Blue for Wastewater Treatment

“…The degradation kinetics were well fitted by the pseudo-first-order model shown in Figure 12d, and the theoretical De (the degradation amount at the degradation equilibrium) value was 146 mg g −1 , which was in good agreement with the experimental data. This analysis result indicated that the pseudo-first-order model could effectively describe the MB degradation process in MnO nanomixtures [45,46,47,48,49,50,51,52].…”

Facile Preparation of Self-Assembled Polydopamine-Modified Electrospun Fibers for Highly Effective Removal of Organic Dyes

“…Good stability and reusability of the adsorbent are important considerations for practical production. Adsorbents with excellent reusability have been reported in previous studies [51,52,53,54,55,56,57,58]. For example, Lu et al [41] investigated the reuse efficiency of the PDA/PEI@PVA/PEI composite adsorbent on Ponceau S (PS) of up to 91% after ten times cycling, suggesting excellent stability and recycling ability.…”