Abstract：
BACKGROUND: Mercury is one of the most toxic heavy metal contaminants that can be harmful to human health through the food chain. Recently, the colorimetric detection of heavy metals based on nanozyme catalytic activity has received extensive interest due to the simplicity, signal visibility and suitability for in situ detection. However, the majority of these nanozymes that can be utilized for detecting mercury with high synthesis temperature and complicated synthesis methods, which limited their practical application.
RESULTS: In this work, flower-like ZnO@Pt composites were simply synthesized at room temperature, the flower-like structure and the high electron mobility of ZnO endow ZnO@Pt with stronger peroxidase-like activity. Consequently, dual-mode (UV-vis and smartphone) colorimetric sensors were designed to detect Hg2+. In UV-vis mode, the Hg2+ concentration linear range was 10-400 nM, and the limit of detection (LOD) was 0.54 nM. In smartphone mode, the Hg2+ concentration linear range was 50-1250 nM, and the LOD was 29.8 nM. A parallel analysis in 3 real water samples was confirmed by ICP-MS, the results showed good correlations (R2 > 0.98), indicating the practical reliability of these sensors.
CONCLUSIONS: The novel flower-like ZnO@Pt composites with high stability, catalytic activity and Hg2+ response were simply synthesized at room temperature, simplifying the synthesis steps and reducing costs. The sensitivity of the developed colorimetric sensor in UV-vis mode was 3-145 times higher than that of the similar methods. The colorimetric sensor in smartphone mode broadened the detection range and improved the portability of Hg2+ detection. Thus, the dual-mode (UV-vis and smartphone) colorimetric sensors providing new detection modes for rapid monitoring of Hg2+ in environmental water.
RESULTS: In this work, flower-like ZnO@Pt composites were simply synthesized at room temperature, the flower-like structure and the high electron mobility of ZnO endow ZnO@Pt with stronger peroxidase-like activity. Consequently, dual-mode (UV-vis and smartphone) colorimetric sensors were designed to detect Hg2+. In UV-vis mode, the Hg2+ concentration linear range was 10-400 nM, and the limit of detection (LOD) was 0.54 nM. In smartphone mode, the Hg2+ concentration linear range was 50-1250 nM, and the LOD was 29.8 nM. A parallel analysis in 3 real water samples was confirmed by ICP-MS, the results showed good correlations (R2 > 0.98), indicating the practical reliability of these sensors.
CONCLUSIONS: The novel flower-like ZnO@Pt composites with high stability, catalytic activity and Hg2+ response were simply synthesized at room temperature, simplifying the synthesis steps and reducing costs. The sensitivity of the developed colorimetric sensor in UV-vis mode was 3-145 times higher than that of the similar methods. The colorimetric sensor in smartphone mode broadened the detection range and improved the portability of Hg2+ detection. Thus, the dual-mode (UV-vis and smartphone) colorimetric sensors providing new detection modes for rapid monitoring of Hg2+ in environmental water.
摘要：
背景：汞是毒性最强的重金属污染物之一，可通过食物链对人体健康有害。最近,基于纳米酶催化活性的重金属比色检测因其简单性受到了广泛的关注,信号可见性和现场检测的适用性。然而,这些纳米酶中的大多数可用于高合成温度和复杂合成方法的汞检测，这限制了它们的实际应用。
结果：在这项工作中，在室温下简单合成了花状ZnO@Pt复合材料，ZnO的花状结构和高电子迁移率赋予ZnO@Pt更强的过氧化物酶活性。因此,设计了双模式(UV-vis和智能手机)比色传感器来检测Hg2+。在UV-vis模式下，Hg2+浓度线性范围为10-400nM，检测限(LOD)为0.54nM。在智能手机模式下，Hg2+浓度线性范围为50-1250nM，LOD为29.8nM。通过ICP-MS证实了3个真实水样的平行分析，结果显示良好的相关性(R2>0.98)，表明这些传感器的实际可靠性。
结论：新型花状ZnO@Pt复合材料具有高稳定性，在室温下简单合成了催化活性和Hg2+响应，简化合成步骤并降低成本。开发的比色传感器在UV-vis模式下的灵敏度是类似方法的3-145倍。智能手机模式下的比色传感器拓宽了检测范围，提高了Hg2+检测的便携性。因此，双模式（UV-vis和智能手机）比色传感器为快速监测环境水中的Hg2+提供了新的检测模式。
结果：在这项工作中，在室温下简单合成了花状ZnO@Pt复合材料，ZnO的花状结构和高电子迁移率赋予ZnO@Pt更强的过氧化物酶活性。因此,设计了双模式(UV-vis和智能手机)比色传感器来检测Hg2+。在UV-vis模式下，Hg2+浓度线性范围为10-400nM，检测限(LOD)为0.54nM。在智能手机模式下，Hg2+浓度线性范围为50-1250nM，LOD为29.8nM。通过ICP-MS证实了3个真实水样的平行分析，结果显示良好的相关性(R2>0.98)，表明这些传感器的实际可靠性。
结论：新型花状ZnO@Pt复合材料具有高稳定性，在室温下简单合成了催化活性和Hg2+响应，简化合成步骤并降低成本。开发的比色传感器在UV-vis模式下的灵敏度是类似方法的3-145倍。智能手机模式下的比色传感器拓宽了检测范围，提高了Hg2+检测的便携性。因此，双模式（UV-vis和智能手机）比色传感器为快速监测环境水中的Hg2+提供了新的检测模式。
