Tao Wang

Fudan University

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Liwu Zhang

Fudan University

Yangyang Liu

Fudan University

Jianmin Chen

Fudan University

Hanyun Cheng

Fudan University

Yue Deng

Cornell University

Hongbo Fu

Fudan University

C. George

Université Claude Bernard Lyon 1

Kejian Li

Chongqing University of Science and Technology

Xiansheng Liu

Institute of Environmental Assessment and Water Research

Yang Yang

Nanjing University of Information Science and Technology

Cooperative Institutions

Fudan University

Centre National de la Recherche Scientifique

Chinese Academy of Sciences

Shanghai Institute of Pollution Control and Ecological Security

Institute of Environmental Assessment and Water Research

State Key Laboratory of Pollution Control and Resource Reuse

University of Chinese Academy of Sciences

State Council of the People's Republic of China

Shandong University

Tsinghua University

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Sunlight Induces the Production of Atmospheric Volatile Organic Compounds (VOCs) from Thermokarst Ponds

Environmental Science & Technology (2023)

Tao Wang Carmen Kalalian Daniel Fillion S. Perrier Jianmin Chen

Ground subsidence caused by permafrost thawing causes the formation of thermokarst ponds, where organic compounds from eroding permafrost accumulate. We photolyzed water samples from two such ponds in Northern Quebec and discovered the emission of volatile organic compounds (VOCs) using mass spectrometry. One pond near peat-covered permafrost mounds was organic-rich, while the other near sandy mounds was organic-poor. Compounds up to C10 were detected, comprising the atoms of O, N, and S. The main compounds were methanol, acetaldehyde, and acetone. Hourly VOC fluxes under actinic fluxes similar to local solar fluxes might reach up to 1.7 nmol C m-2 s-1. Unexpectedly, the fluxes of VOCs from the organic-poor pond were greater than those from the organic-rich pond. We suggest that different segregations of organics at the air/water interface may partly explain this observation. This study indicates that sunlit thermokarst ponds are a significant source of atmospheric VOCs, which may affect the environment and climate via ozone and aerosol formation. Further work is required for understanding the relationship between the pond's organic composition and VOC emission fluxes.

Thermokarst

10.1021/acs.est.3c03303

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Photoinduced Evolutions of Permafrost-Derived Carbon in Subarctic Thermokarst Pond Surface Waters

Environmental Science & Technology (2024)

Tao Wang Carmen Kalalian Xinke Wang Dandan Li S. Perrier

In subarctic regions, rising temperature and permafrost thaw lead to the formation of thermokarst ponds, where organics from eroding permafrost accumulate. Despite its environmental significance, limited knowledge exists regarding the photosensitivity of permafrost-derived carbon in these ponds. In this study, laboratory experiments were conducted to explore the photochemical transformations of organic matter in surface water samples from thermokarst ponds from different environments in northern Quebec, Canada. One pond near Kuujjuarapik is characterized by the presence of a collapsing palsa and is therefore organically rich, while the other pond near Umiujaq is adjacent to a collapsing lithalsa and thus contains fewer organic matters. Photobleaching occurred in the Umiujaq sample upon irradiation, whereas the Kuujjuarapik sample exhibited an increase in light absorbance at wavelength related to aromatic functionalities, indicating different photochemical aging processes. Ultrahigh-resolution mass spectrometry analysis reveals that the Kuujjuarapik sample preferentially photoproduced highly unsaturated CHO compounds with great aromaticity, while the irradiated Umiujaq sample produced a higher proportion of CHON aromatics with reduced nitrogen functionalities. Overall, this study illustrates that the photochemical reactivity of thermokarst pond water varies with the source of organic matter. The observed differences in reactivity contribute to an improved understanding of the photochemical emission of volatile organic compounds discovered earlier. Further insights into the photoinduced evolutions in thermokarst ponds may require the classification of permafrost-derived carbon therein.

Thermokarst

Subarctic climate

Carbon fibers

10.1021/acs.est.4c05320

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Unveiling the pollution and risk of atmospheric (gaseous and particulate) polycyclic aromatic hydrocarbons (PAHs) in a heavily polluted Chinese city: A multi-site observation research

Journal of Cleaner Production (2023)

Tao Wang Luyao Zhang Pei Zhang Guangyuan Yu Chong Chen

Emission inventory

Atmospheric pollution

10.1016/j.jclepro.2023.139454

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Citations (5)

Highly efficient CO2 reduction on ordered porous Cu electrode derived from Cu2O inverse opals

Nano Energy (2018)

Xiuzhen Zheng Jin Han Yu Fu Yue Deng Yangyang Liu

10.1016/j.nanoen.2018.03.023

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Citations (58)

The influence of temperature on the heterogeneous uptake of SO2 on hematite particles

The Science of The Total Environment (2018)

Tao Wang Yangyang Liu Yue Deng Hongbo Fu Liwu Zhang

10.1016/j.scitotenv.2018.07.046

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Citations (27)

PM10-bound trace elements in pan-European urban atmosphere

Environmental Research (2024)

Xiansheng Liu Xun Zhang Tao Wang Bowen Jin Lijie Wu

Although many studies have discussed the impact of Europe's air quality, very limited research focused on the detailed phenomenology of ambient trace elements (TEs) in PM

TRACE (psycholinguistics)

Trace gas

10.1016/j.envres.2024.119630

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Impact of greenhouse gas CO2 on the heterogeneous reaction of SO2 on alpha-Al2O3

Chinese Chemical Letters (2020)

Yangyang Liu Tao Wang Xiaozhong Fang Yue Deng Hanyun Cheng

Atmospheric chemistry

Mineral dust

Earth's energy budget

10.1016/j.cclet.2020.04.037

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Citations (18)

Photoelectrocatalytic degradation of endocrine-disruptor bisphenol – A with significantly activated peroxymonosulfate by Co-BiVO4 photoanode

Chemical Engineering Journal (2020)

Aziz-Ur-Rahim Bacha Iqra Nabi Hanyun Cheng Kejian Li Saira Ajmal

Degradation

Endocrine disruptor

10.1016/j.cej.2020.124482

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Citations (92)

Photochemical reaction of NO2 on photoactive mineral dust: Mechanism and irradiation intensity dependence

Journal of Photochemistry and Photobiology A Chemistry (2021)

Tao Wang Yangyang Liu Yue Deng Hanyun Cheng Yang Yang

Light intensity

10.1016/j.jphotochem.2021.113319

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Citations (12)

Enhanced heterogeneous uptake of sulfur dioxide on mineral particles through modification of iron speciation during simulated cloud processing

Atmospheric chemistry and physics (2019)

Zhenzhen Wang Tao Wang Hongbo Fu Liwu Zhang Mingjin Tang

Abstract. Iron-containing mineral aerosols play a key role in the oxidation of sulfur species in the atmosphere. Simulated cloud processing (CP) of typical mineral particles, such as illite (IMt-2), nontronite (NAu-2), smectite (SWy-2) and Arizona Test Dust (ATD) is shown here to modify sulfur dioxide (SO2) uptake onto mineral surfaces. Heterogeneous oxidation of SO2 on particle surfaces was firstly investigated using an in situ DRIFTS apparatus (diffuse reflectance infrared Fourier transform spectroscopy). Our results showed that the Brunauer–Emmett–Teller (BET) surface area normalized uptake coefficients (γBET) of SO2 on the IMt-2, NAu-2, SWy-2 and ATD samples after CP were 2.2, 4.1, 1.5 and 1.4 times higher than the corresponding ones before CP, respectively. The DRIFTS results suggested that CP increased the amounts of reactive sites (e.g., surface OH groups) on the particle surfaces and thus enhanced the uptake of SO2. Transmission electron microscopy (TEM) showed that the particles broke up into smaller pieces after CP, and thus produced more active sites. The “free-Fe” measurements confirmed that more reactive Fe species were present after CP, which could enhance the SO2 uptake more effectively. Mössbauer spectroscopy further revealed that the formed Fe phases were amorphous Fe(III) and nanosized ferrihydrite hybridized with Al ∕ Si, which were possibly transformed from the Fe in the aluminosilicate lattice. The modification of Fe speciation was driven by the pH-dependent fluctuation coupling with Fe dissolution–precipitation cycles repeatedly during the experiment. Considering both the enhanced SO2 uptake and subsequent promotion of iron dissolution along with more active Fe formation, which in turn led to more SO2 uptake, it was proposed that there may be a positive feedback between SO2 uptake and iron mobilized on particle surfaces during CP, thereby affecting climate and biogeochemical cycles. This self-amplifying mechanism generated on the particle surfaces may also serve as the basis of high sulfate loading in severe fog–haze events observed recently in China.

Ferrihydrite

Nontronite

Particle (ecology)

Illite

10.5194/acp-19-12569-2019

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Citations (29)