Raspberry-Like Bismuth Oxychloride on Mesoporous Siliceous Support for Sensitive Electrochemical Stripping Analysis of Cadmium

Abstract

BiOCl-SiO2 KIT-6 composite materials with raspberry-like structures are facilely prepared under hydrothermal conditions. The mesoporous siliceous support of SiO2 KIT-6-incorporated BiOCl with enlarged yet refined surface morphology characterized by physiochemical methods exhibits an improved electrochemical performance. A sensitive electrochemical detection method of cadmium concentration using square wave anodic stripping voltammetry was developed based on BiOCl-SiO2 KIT-6 composite-modified glassy carbon electrodes, which displayed wide linear ranges of 0.5 to 10 μg/L and 10 to 300 μg/L and a detection limit of 65 ng/L. The sensitive, versatile and eco-friendly sensor was successfully applied for the determination of cadmium-spiked human blood samples.

Multifunctional Bismuth-Based Materials for Heavy Metal Detection and Antibiosis

“…anodic stripping voltammetry (SWASV), the constructed BiOCl-KIT-6/GCE applied to the determination of cadmium-spiked human blood samples resulted in a calibration curve of Cd 2+ with 2 linear ranges from 0.5 to 10 and from 10 to 300 μg/L (Figure 5), respectively, and a detection limit of 65 ng/L. As shown in Figure 6, a good agreement between the detection methods of SWASV and inductively coupled plasma mass spectrometry (ICP-MS) was observed [11]. Moreover, the BiOCl-KIT-6/GCE could be repeatedly used for at least 30 continuous times in one day and at least 10 continuous days with a marginal reduction of stripping peak current of 6.8 and 3.6%, respectively.…”

“…personnel. Meanwhile, the bismuth-based sensors provide detection sensitivity and accuracy comparable to that of mercury-based ones [11], which are attractive for practical applications. Recently, bismuth-based sensors, exhibiting improved separation ability of intermetallic compounds, compared with mercury-based ones, have been used to evaluate heavy metals such as Cd 2+ and Pb 2+ .…”

“…Song and coworkers determined Cd 2+ in blood samples based on BiOCl-KIT-6 modified glassy carbon electrode [11]. During the past decade, many studies have introduced a number of trace heavy metal detection methods based on bismuth-based electrode.…”

“…However, their applications to environmental, food, and clinical samples have just started. For example, by the use of anodic stripping voltammetry, cadmium and lead at trace levels in environmental samples [23,24], food products [25,26] and biological fluids [11] have been determined. Using square-wave Table 2.…”

“…The determination results of blood cadmium concentration by anodic stripping voltammetry (ASV) using BiOCl-KIT-6/GCE in comparison with ICP-MS assay (adapted from Ref [11]…”