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Selective detection of thallium by prussian blue-coated gold nano-colorimetric probe

Abstract

Thallium as a highly dispersed and toxic heavy metal element, is distributed in soil and water due to a result of industrial activities. Thallium is extremely accumulative, which not only makes it harmful to the environment, but also enriches in living organisms and eventually poses a serious threat to human health. In order to detect thallium ions in water quickly and effectively, a PB@AuNPs nano-colorimetric probe based on gold nanoparticles coated with soluble prussian blue was proposed and characterized by UV-visible photometer, dynamic light scattering particle size distribution, Fourier transform infrared spectroscopy and X-ray diffraction. When Tl+ ions were present in the test sample, PB@AuNPs tended to adsorb Tl+ in the system and agglomerated, which exhibited a remarkable color change from wine red to blue. Meanwhile, the intensity and displacement of surface plasmon resonance (SPR) absorption peak changed. PB@AuNPs nanoprobe exhibited a 0.67 mu M of limit of detection (LOD) for UV-vis spectra under the optimal pH being 6 with a good linear relationship between the absorbance ratios and the concentrations of Tl+ ions in the range of 10.0 similar to 30.0 mu M, y = 0.04239 x - 0.07483, R-2 = 0.99137. The results showed that PB@AuNPs nanoprobe had high selectivity and good anti-interference, which could be used in the detection of actual water samples.

article Article

date_range 2024

language English

link Link of the paper

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Li Hai-Ting

Huang Shi-Jie

Liu Lv-Cheng

Xue Jin-Peng

Li Xing

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Featured Keywords

Thallium ion

Gold nanoparticles

Soluble prussian blue

Colorimetric detection

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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