Detection of heavy metal ions using a water‐soluble conjugated polymer based on thiophene and meso‐2,3‐dimercaptosuccinic acid

Abstract

This work reports the synthesis of a new water‐soluble conjugated polymer, which interacts specifically with heavy metal ions such as lead and mercury. In order to produce such a material, the fluorescent properties of polythiophene, which constitutes the polymer backbone, were combined with the chelating capacity of meso‐2,3‐dimercaptosuccinic acid, which forms the side‐chain of the conjugated polymer. Thus, the new polymer acts as chemical complexing agent, the fluorescence of which is quenched in the presence of heavy metal ions. A possible explanation of the mechanism of such a variation is also discussed. The system presented is envisaged to be used as a sensor for heavy metal ions that appear as pollutants in the environment.

Sub-picosecond delocalization in the excited state of conjugated homopolymers and donor–acceptor copolymers

“…[1][2][3][4] Applications include lightemitting diodes (OLEDs), [5][6][7][8][9][10] eld effect transistors (OFETs), [11][12][13][14][15] lasers, [16][17][18][19][20] photodetectors, [21][22][23][24][25] sensors, [26][27][28][29] and organic photovoltaic (OPV) devices. [30][31][32][33][34] Functioning is oen based on processes that occur in the excited state, populated for example by optical absorption or electrical stimulus.…”

“…The small polymerization effect is mainly ascribed to the large size of the repeat unit, which has already extended conjugation over ve aromatic rings, so that saturation is reached more quickly when more units are added. The partial electron localization on the BT unit in the LUMO level might also prevent effective coupling of this orbital amongst monomers, and conjugation might be reduced by the (calculated) 26 twist angle between the CB and dTBT planes. Additional blue shi for a PCDTBT derivative with bulky side chains occurred upon increase of the twist angle.…”

Effects and Mechanisms of Microbial Remediation of Heavy Metals in Soil: A Critical Review

“…In addition, Fenton processes are helpful in the removal of heavy metals. Laurenti et al [79] showed that the lowest amount of total organic carbon removal is 50%, but removal can reach 100% under certain conditions. Karci et al [80] showed that in soil and water contaminated by Zn 2+ and Ni 3+ , total organic carbon was completely removed for all runs tested in the present study after pH adjustments.…”

Colorimetric detection of Hg2+ using a mixture of an anionic azo dye and a cationic polyelectrolyte in aqueous solution

“…The detection of heavy metal ions is of significance for analytical, biomedical and environmental chemistry due to their adverse effects on human health and the global environment. [1][2][3][4][5][6][7][8][9][10][11][12] Among heavy metal ions, mercury is considered as one of the most extremely toxic and dangerous metal ions for the environment and human health because of its easy accumulation and difficult biodegradation. [13][14][15] Mercury has been widely used in batteries, paints and electronic equipment, leading to an increase of its release to the environment.…”