Rapid and precise detection of Tl + and Pb 2+ is important to prevent water poisoning and environmental pollution. Gold nanoparticles (AuNPs) have gained focus for heavy metal ion detection but cannot yet achieve accurate quantitative analyses when Tl + and Pb 2+ coexist. We propose a sensitive, flexible, and low-cost method for the qualitative and quantitative analysis of binary Tl + /Pb 2+ mixtures based on AuNP sensors. Partial least squares, back interval partial least squares and data fusion applied to analyze UV–Vis spectral data according to the AuNPs aggregation behavior, revealed discrete responses to the target analytes. The limits of detection for Tl + and Pb 2+ in the binary mixture were 5.23 and 1.76 nM, respectively, and good linear dependence was obtained. The method was successfully applied to the detection of both ions in tap and mineral water. This method can reveal water poisoning and environmental pollution events to ensure drinking water safety.
Zhang Hailong,Ma Xiaoming,Wang Zhangxin,Han Bin,Yang Zhengheng,He Di
Thallium, a highly toxic pollutant, shows greater toxicity to human than other common heavy metals such as mercury, lead, cadmium and its effective removal from wastewater gains great attention. The main restriction for the Tl + removal is the interference of a high concentration of co-existing ions in wastewater. Therefore, the goal of the current work was to synthesis adsorbent with high selectivity for the Tl + removal. Herein, the pore size sieving strategy was proposed and Prussian blue-impregnated biochar (BC@PB) particles was synthesized. More than 95% Tl + can be removed even the concentrations of the coexistence ions (Na + , Cd 2+ , and Zn 2+ ) 1,000 higher than the initial concentration of Tl + (500 μg/L). BC@PB also showed large adsorption capacity (9365 μg/g) and more than 99% Tl + (initial concentration, 500 μg/L) were removed in just 1 min. The BC@PB had excellent and stable Tl + removal ability (> 99%) over a range of pH from 3 to 9, which covered the pH range of common thallium-containing wastewater. The density functional theory (DFT) calculation confirmed that not only hydrated volume but also the hydration free energy of ions, which governed the energy barrier for ions entering into narrow channels of BC@PB, played essential roles on the selectivity removal of Tl + . Overall, due to its high selectivity, high adsorption capacity and easy preparation process, the synthesized BC@PB particles based on the pore sizing sieving strategy, can be a promising candidate for the removal of thallium from wastewater.
Lijuan Huang,Longyan Xiang,Yan Zhang,Yongan Wang,Zhiyong Nie
The simultaneous detection of K + and Tl + can serve as a toxicological diagnostic tool for thallium poisoning. Colorimetric-reaction-based nanoprobes have emerged as promising sensors for the rapid and ultrasensitive detection of molecular species in simple systems. However, the development of viable screening tools for multicomponent analysis in complex systems remains challenging owing to interference from coexisting materials in the media. Herein, a simple chemical sensor array based on the peroxidase-like activity of gold nanoparticles modified with single-stranded DNA (AuNPs-ssDNA) and chemometrics was developed for the simultaneous detection of K + and Tl + in aqueous solutions and serum. The use of a K + adapter conferred high selectivity to the developed method. Optimized AuNPs-ssDNAs were used to construct a sensor array, which together with chemometrics provided fingerprints that can facilitate the simultaneous analysis of multiple components. The developed colorimetric reaction in combination with the chemometrics assay was directly used as a biosensor array, which exhibited detection limits of 107.33 nM for K + and 19.26 nM for Tl + . The developed method could potentially serve as a diagnostic technique for investigating thallium poisoning and toxicology.
危险品化学品经营许可证（带存储）