Assembling reduced graphene oxide with sulfur/nitrogen- "hooks" for electrochemical determination of Hg(II).

Herein the sulfur/nitrogen contained groups, serving as the "hooks" for electrochemical determination of Hg(II), were assembled on the reduced graphene oxide (hereafter SN-rGO) via a one-step facile hydrothermal method. The thiourea acts as a precursor for sulfur/nitrogen doping and partial reduction of graphene oxide. The SN-rGO was used to modify the glassy carbon electrode (GCE) for electrochemical detection of Hg(II) by square wave anodic stripping voltammetry (SWASV).

Construction of electrochemical sensing interface towards Cd(II) based on activated g-CN nanosheets: considering the effects of exfoliation and protonation treatment.

There is an urgent need to construct highly selective low-cost sensors for fast detection of toxic metal ions such as cadmium. When compared with 3D bulk materials, 2D layered materials after activation treatments show superior performances for electrochemical metal ion detection. The bulk graphitic carbon nitride (hereafter b-g-CN) was prepared by thermal polymerization with urea as a precursor; it was then activated through ultrasonic liquid exfoliation and protonation which resulted in successful fabrication of activated ultrathin g-CN nanosheets (hereafter a-g-CN).

Sensitive and anti-interference stripping voltammetry analysis of Pb(II) in water using flower-like MoS/rGO composite with ultra-thin nanosheets.

Herein, combined with the outstanding adsorption ability of flower-like MoS with ultra-thin nanosheets and the good electrical conductivity of reduced graphene oxide (rGO), a sensitive and anti-interference electrochemical sensing interface for the analysis of Pb(II) was constructed by using MoS/rGO nanocomposite modified glassy carbon electrode (MoS/rGO-GCE). The stripping behavior of Pb(II) was estimated using square wave anodic stripping voltammetry (SWASV), a high sensitivity of 50.80 μA μM was achieved, and the limit of detection (LOD) was determined to be 0.