Sensitive Colorimetric Sensor for Lead Ions and VOCs Based on Histidine-Functionalized Polydiacetylene
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Article www.springer.com/13233 pISSN 1598-5032 eISSN 2092-7673
Sensitive Colorimetric Sensor for Lead Ions and VOCs Based on Histidine-Functionalized Polydiacetylene Guang Yang1,2 Ziwei Nie1 Siyu Zhang1 Zhaoliang Ge1 Jiayin Zhao1 Jiuru Zhang1 Bin Li*,1,2
1
Department of Chemistry and Chemical Engineering, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Hexing Road 26th, Harbin, Heilongjiang 150040, P. R. China 2 Post-doctoral Mobile Research Station of Forestry Engineering, Northeast Forestry University, Hexing Road 26th, Harbin, Heilongjiang 150040, P. R. China Received April 3, 2020 / Revised September 11, 2020 / Accepted September 26, 2020
Abstract: Due to the high toxicity of lead ions (Pb2+) and volatile organic compounds (VOCs) to human health and the environment, increasing attention has been paid by scientists to the development of simple, flexible and sensitive sensors or methods that are capable of tracing Pb2+ ions or VOCs with colorimetric visualization. In this study, the fabrication of colorimetric sensors based on histidine-functionalized diacetylene (His-DA), chromatic π-conjugated liposomes, for tracing Pb2+ ions was described. With a suitable molar ratio (4:1) between the10,12-pentacosadiynoic acid (PCDA) and His-DA monomers, the histidine units of the hybrid liposomes could rationally interrupt the efficient backbone length of polydiacetylene (PDA) chains, which causes the probe to be highly sensitive and selective for colorimetric visualization of tracing Pb2+ ions. Moreover, the His-PDA films also displayed sensitivity to volatile organic solvents or vapors, which could promote vivid color changes from blue to purple or pink. These interesting findings indicate that histidine-functionalized diacetylene may offer a promising way to design smart devices for real applications of sensing or tracing hazardous substances in the future. Keywords: polydiacetylene, liposome, sensor, lead ion, volatile organic compounds.
1. Introduction As a kind of toxic heavy metal ion, lead ions (Pb2+), which exist in industrial wastewater, pigments or batteries, can cause several illnesses in humans and other living organisms.1-3 Similar to other toxic heavy metal ions, Pb2+ ions can be transferred to the biosphere and finally uptake by humans via eating or drinking, which could cause great damage to the brain or nervous system. The maximum permissive content of Pb2+ ions in drinking water is 10 μg L-1,4 therefore, several methods have been developed for the detection of Pb2+ ions, including voltammetry, surface enhanced Raman spectroscopy (SERS) or potentiometry.5-10 Although the above traditional analytical techniques demonstrated highly sensitive or fast response times, several shortcomings, including high cost, intricate instrumentation and the operational requirement of professionals, are also present among these techniques. Therefore, it remains a great challenge to fabricate a sensitive and selective sensor for Pb2+ ion detection. Meanwhile, another well
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