Effects of light irradiation on the complexes of cadmium and humic acids: The role of thiol groups

Jia, Yanming; Zhao, Tuokun; Zhao, Nan; Wei, Hang; Zhang, Weihua; Qiu, Rongliang

doi:10.1016/j.chemosphere.2019.03.029

Cited by 16 publications

(4 citation statements)

References 44 publications

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“…24 For example, HA can adsorb heavy metal Cd in natural water to form stable complexes (Cd–HA), thereby reducing the toxicity and activity of newly deposited Cd( ii ) in surface water. 25 Our previous study also found that HA almost completely inhibited the direct photolysis of tetracycline antibiotics through light shielding and complexation. 26 However, how HA complexed with the antibiotic molecule and why complexation changes the SMX photolysis are still not clear.…”

Section: Introductionmentioning

confidence: 81%

Multiple roles of humic acid in the photolysis of sulfamethoxazole: kinetics and mechanism

Chen,

Song,

Yang

et al. 2023

Environ. Sci.: Water Res. Technol.

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Section: Introductionmentioning

confidence: 81%

Multiple roles of humic acid in the photolysis of sulfamethoxazole: kinetics and mechanism

Chen,

Song,

Yang

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…Thiol groups in DOM were quantified by using a fluorescent method with N-(1pyrenyl) maleimide (NPM, Figure S1) in an anaerobic glovebox and analyzed with a Varioskan LUX 3020 spectrophotometer (Thermo Scientific, Waltham, MA) at an excitation wavelength (λ ex ) of 341 nm and emission wavelength (λ em ) of 373 nm. 36 More details are given in the SI. Considering DOM's complex structure (e.g., molecular folding), steric hindrance may lead to an underestimation of total thiol content using the NPM method (Figure S1), compared with that of sulfur X-ray absorption near-edge structure (XANES) spectroscopy.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Thiol groups in DOM were quantified by using a fluorescent method with N -(1-pyrenyl) maleimide (NPM, Figure S1) in an anaerobic glovebox and analyzed with a Varioskan LUX 3020 spectrophotometer (Thermo Scientific, Waltham, MA) at an excitation wavelength (λ ex ) of 341 nm and emission wavelength (λ em ) of 373 nm . More details are given in the SI.…”

Section: Methodsmentioning

confidence: 99%

Competitive Binding Kinetics of Methylmercury–Cysteine with Dissolved Organic Matter: Critical Impacts of Thiols on Adsorption and Uptake of Methylmercury by Algae

Shen,

Liu,

Guo

et al. 2024

Environ. Sci. Technol.

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Complexes with low-molecular-weight thiols are crucial species of methylmercury (MeHg) excreted by anaerobic Hg-methylating microbes, notably, MeHg−cysteine (MeHg−Cys). As MeHg−Cys diffuses into surface water, it would undergo a ligand exchange process with dissolved organic matter (DOM) under nonsulfidic conditions, inevitably altering MeHg speciation and bioavailability to phytoplankton. In this study, we investigated the competitive binding kinetics between MeHg−Cys and Suwannee River natural organic matter, and their influence on the adsorption and uptake of MeHg by the cyanobacterium, Synechocystis sp. PCC6803. Liquid chromatography-inductively coupled plasma mass spectrometry was employed to monitor the kinetics processes involving competition of DOM with Cys for MeHg binding, which revealed that competitive binding kinetics were dictated by the abundance of thiol moieties in DOM. Thiol concentrations of 0.97 and 49.34 μmol of thiol (g C) −1 resulted in competitive binding rate constant (k values) of 0.30 and 3.47 h −1 , respectively. Furthermore, the time-dependent competitive binding of DOM toward MeHg−Cys significantly inhibited MeHg adsorption and uptake by cyanobacteria, an effect that was amplified by an increased thiol abundance in DOM. These findings offer valuable insights into the kinetic characteristics of MeHg's fate and transport, as well as their impact on bioconcentration in aquatic organisms within natural aquatic ecosystems.

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“…-13 )(Jia et al, 2019), which cannot be oxidized by photogeneration holes or ROS in solution. Meanwhile, the solution pH value would increase affecting the photolysis of CdS(Luo et al, 2017;Matsumoto et al, 1996).…”

mentioning

confidence: 99%

Activation of cadmium under simulated solar illumination and its impact on the mobility of Cd in flooded soils

Luo

Xiao

Liu

et al. 2022

Environ Sci Pollut Res

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In waterlogged paddy soils, cadmium (Cd) can be precipitated as cadmium sul de (CdS) under reductive environment, thereby limiting the absorption of Cd by plants. Multiple environmental factors (such as water, pH, Eh, etc.) played a role in the control of Cd mobility and bioavailability. In this study, we investigated the in uence of the solar irradiation on the photo-dissolution of synthetic CdSmontmorillonite composites (CdS-M) in solution and the stability of Cdin natural soil. The release kinetic of Cd 2+ showed that after the irradiation of simulated sunlight, CdS-M composites became less stable compared to the dark control. The solar irradiation seemed to enhance the release of Cd 2+ from CdS signi cantly and continuously. Electron paramagnetic resonance (EPR) and quenching experiments con rmed that the photogenerated holes, O 2•and •OH were possibly involved in the photo-induced release of Cd 2+ , while the holes was primarily responsible for the reaction.Irradiation under alkaline solution or the presence of DOM, PO 4 3-, CO 3 2and urea markedly inhibited the photodissolution process of CdS. The photo-mediated activation of Cd was further con rmed in paddy soil under natural sunlight, with a nearly 3-fold increase in concentration of extractable Cd during the 15 days irradiation. This study highlights the importance of photochemical transformation of Cd in the environmental water and soil.

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Effects of light irradiation on the complexes of cadmium and humic acids: The role of thiol groups

Cited by 16 publications

References 44 publications

Multiple roles of humic acid in the photolysis of sulfamethoxazole: kinetics and mechanism

Multiple roles of humic acid in the photolysis of sulfamethoxazole: kinetics and mechanism

Competitive Binding Kinetics of Methylmercury–Cysteine with Dissolved Organic Matter: Critical Impacts of Thiols on Adsorption and Uptake of Methylmercury by Algae

Activation of cadmium under simulated solar illumination and its impact on the mobility of Cd in flooded soils

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