scholarly journals Reactive oxygen species formed in aqueous mixtures of secondary organic aerosols and mineral dust influencing cloud chemistry and public health in the Anthropocene

2017 ◽  
Vol 200 ◽  
pp. 251-270 ◽  
Author(s):  
Haijie Tong ◽  
Pascale S. J. Lakey ◽  
Andrea M. Arangio ◽  
Joanna Socorro ◽  
Christopher J. Kampf ◽  
...  
Keyword(s):  
Public Health ◽  
Reactive Oxygen Species ◽  
Secondary Organic Aerosols ◽  
Mineral Dust ◽  
Organic Aerosols ◽  
Reactive Oxygen ◽  
Oh Radicals ◽  
Oxygen Species ◽  
Aqueous Mixtures ◽  
Cloud Chemistry

Mineral dust and secondary organic aerosols (SOA) account for a major fraction of atmospheric particulate matter, affecting climate, air quality and public health. How mineral dust interacts with SOA to influence cloud chemistry and public health, however, is not well understood. Here, we investigated the formation of reactive oxygen species (ROS), which are key species of atmospheric and physiological chemistry, in aqueous mixtures of SOA and mineral dust by applying electron paramagnetic resonance (EPR) spectrometry in combination with a spin-trapping technique, liquid chromatography-tandem mass spectrometry (LC-MS/MS), and a kinetic model. We found that substantial amounts of ROS including OH, superoxide as well as carbon- and oxygen-centred organic radicals can be formed in aqueous mixtures of isoprene, α-pinene, naphthalene SOA and various kinds of mineral dust (ripidolite, montmorillonite, kaolinite, palygorskite, and Saharan dust). The molar yields of total radicals were ∼0.02–0.5% at 295 K, which showed higher values at 310 K, upon 254 nm UV exposure, and under low pH (<3) conditions. ROS formation can be explained by the decomposition of organic hydroperoxides, which are a prominent fraction of SOA, through interactions with water and Fenton-like reactions with dissolved transition metal ions. Our findings imply that the chemical reactivity and aging of SOA particles can be enhanced upon interaction with mineral dust in deliquesced particles or cloud/fog droplets. SOA decomposition could be comparably important to the classical Fenton reaction of H2O2 with Fe2+ and that SOA can be the main source of OH radicals in aqueous droplets at low concentrations of H2O2 and Fe2+. In the human respiratory tract, the inhalation and deposition of SOA and mineral dust can also lead to the release of ROS, which may contribute to oxidative stress and play an important role in the adverse health effects of atmospheric aerosols in the Anthropocene.

scholarly journals Reactive Oxygen Species Production from Secondary Organic Aerosols: The Importance of Singlet Oxygen

2019 ◽  
Vol 53 (15) ◽  
pp. 8553-8562 ◽  
Author(s):  
Alessandro Manfrin ◽  
Sergey A. Nizkorodov ◽  
Kurtis T. Malecha ◽  
Gordon J. Getzinger ◽  
Kristopher McNeill ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Singlet Oxygen ◽  
Reactive Oxygen Species Production ◽  
Secondary Organic Aerosols ◽  
Organic Aerosols ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Species Production

scholarly journals Reactive Oxygen Species Formed by Secondary Organic Aerosols in Water and Surrogate Lung Fluid

2018 ◽  
Author(s):  
Haijie Tong ◽  
Pascale S. J. Lakey ◽  
Andrea M. Arangio ◽  
Joanna Socorro ◽  
Fangxia Shen ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Secondary Organic Aerosols ◽  
Organic Aerosols ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Lung Fluid

Connecting the Oxidative Potential of Secondary Organic Aerosols with Reactive Oxygen Species in Exposed Lung Cells

2019 ◽  
Vol 53 (23) ◽  
pp. 13949-13958 ◽  
Author(s):  
Pratiti Home Chowdhury ◽  
Quanfu He ◽  
Raanan Carmieli ◽  
Chunlin Li ◽  
Yinon Rudich ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Secondary Organic Aerosols ◽  
Organic Aerosols ◽  
Reactive Oxygen ◽  
Lung Cells ◽  
Oxygen Species ◽  
Oxidative Potential

Photocatalytic Degradation of 4-Chlorophenol by •OH Radicals Generated by Thiophene Oligomers Incorporated in ZSM-5 Zeolite Channels

2003 ◽  
Vol 68 (11) ◽  
pp. 2219-2230 ◽  
Author(s):  
Gabriel Čík ◽  
Milada Hubinová ◽  
František Šeršeň ◽  
Jozef Krištín ◽  
Monika Antošová
Keyword(s):  
Reactive Oxygen Species ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Maleic Acid ◽  
Aqueous Suspension ◽  
Reactive Oxygen ◽  
Spin Trapping ◽  
Oh Radicals ◽  
Oxygen Species ◽  
Trapping Method

Degradation of 4-chlorophenol by reactive oxygen species was studied, the latter being generated by photo-assisted reactions of thiophene oligomers, synthesized in channels of the Na-ZSM-5 zeolite. The photoreaction was carried out in an aqueous suspension of photocatalyst, irradiated with visible light (λ > 400 nm). The spin-trapping method was used to detect the generated •OH radicals. The main products of the photodecomposition of 4-chlorophenol were found to be phenol, hydroquinone and maleic acid.

Fabrication of magnetic BaFe12O19/Ag3PO4 composites with an in situ photo-Fenton-like reaction for enhancing reactive oxygen species under visible light irradiation

2019 ◽  
Vol 9 (10) ◽  
pp. 2563-2570 ◽  
Author(s):  
Yuanguo Xu ◽  
Feiyue Ge ◽  
Meng Xie ◽  
Shuquan Huang ◽  
Junchao Qian ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Reactive Oxygen ◽  
Light Irradiation ◽  
Oh Radicals ◽  
Oxygen Species

An in situ photo-Fenton-like and magnetic recycle system, BaFe12O19/Ag3PO4 has been constructed. BaFe12O19 can catalyze the conversion of H2O2 to generate ROSs (˙O2− and ˙OH radicals) on the surface of Ag3PO4.

scholarly journals Photocatalytic Performance of CuxO/TiO2 Deposited by HiPIMS on Polyester under Visible Light LEDs: Oxidants, Ions Effect, and Reactive Oxygen Species Investigation

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 412 ◽  
Author(s):  
Hichem Zeghioud ◽  
Aymen Assadi ◽  
Nabila Khellaf ◽  
Hayet Djelal ◽  
Abdeltif Amrane ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Magnetron Sputtering ◽  
Visible Light ◽  
Metallic Nanoparticles ◽  
Reaction Rate ◽  
Potassium Dichromate ◽  
Reactive Oxygen ◽  
Oh Radicals ◽  
Primary Role ◽  
Oxygen Species

In the present study, we propose a new photocatalytic interface prepared by high-power impulse magnetron sputtering (HiPIMS), and investigated for the degradation of Reactive Green 12 (RG12) as target contaminant under visible light light-emitting diodes (LEDs) illumination. The CuxO/TiO2 nanoparticulate photocatalyst was sequentially sputtered on polyester (PES). The photocatalyst formulation was optimized by investigating the effect of different parameters such as the sputtering time of CuxO, the applied current, and the deposition mode (direct current magnetron sputtering, DCMS or HiPIMS). The results showed that the fastest RG12 degradation was obtained on CuxO/TiO2 sample prepared at 40 A in HiPIMS mode. The better discoloration efficiency of 53.4% within 360 min was found in 4 mg/L of RG12 initial concentration and 0.05% Cuwt/PESwt as determined by X-ray fluorescence. All the prepared samples contained a TiO2 under-layer with 0.02% Tiwt/PESwt. By transmission electron microscopy (TEM), both layers were seen uniformly distributed on the PES fibers. The effect of the surface area to volume (dye volume) ratio (SA/V) on the photocatalytic efficiency was also investigated for the discoloration of 4 mg/L RG12. The effect of the presence of different chemicals (scavengers, oxidant or mineral pollution or salts) in the photocatalytic medium was studied. The optimization of the amount of added hydrogen peroxide (H2O2) and potassium persulfate (K2S2O8) was also investigated in detail. Both, H2O2 and K2S2O8 drastically affected the discoloration efficiency up to 7 and 6 times in reaction rate constants, respectively. Nevertheless, the presence of Cu (metallic nanoparticles) and NaCl salt inhibited the reaction rate of RG12 discoloration by about 4 and 2 times, respectively. Moreover, the systematic study of reactive oxygen species’ (ROS) contribution was also explored with the help of iso-propanol, methanol, and potassium dichromate as •OH radicals, holes (h+), and superoxide ion-scavengers, respectively. Scavenging results showed that O2− played a primary role in RG12 removal; however, •OH radicals’ and photo-generated holes’ (h+) contributions were minimal. The CuxO/TiO2 photocatalyst was found to have a good reusability and stability up to 21 cycles. Ions’ release was quantified by means of inductively coupled plasma mass spectrometry (ICP-MS) showing low Cu-ions’ release.

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