Search results for: Yingxun Du

Items from 1 to 20 out of 25 results

article

The dual roles of dissimilatory iron reduction in the carbon cycle: The “iron mesh” effect can increase inorganic carbon sequestration

Cheng Zhao, Fan Xun, Biao Li, Xiaotong Han, more

Global Change Biology > 30 > 3 > n/a - n/a

Dissimilatory iron reduction (DIR) can drive the release of organic carbon (OC) as carbon dioxide (CO₂) by mediating electron transfer between organic compounds and microbes. However, DIR is also crucial for carbon sequestration, which can affect inorganic‐carbon redistribution via iron abiotic–phase transformation. The formation conditions of modern carbonate‐bearing iron minerals (IC_Fe) and their...

article

Water depth and transparency drive the quantity and quality of organic matter in sediments of Alpine Lakes on the Tibetan Plateau

YingXun Du, ChunYan Luo, FeiZhou Chen, QiaoYing Zhang, more

Limnology and Oceanography > 67 > 9 > 1959 - 1975

Identifying primary environmental drivers mediating the quantity and quality of sedimentary organic matter (OM) in climate‐sensitive alpine lakes is crucial to understanding the role of alpine lakes in greenhouse gas emissions and Earth's climate system. Here, we characterized various pools of OM of 20 alpine lakes across the Tibetan Plateau, including bulk OM, water‐soluble OM and alkaline‐extracted...

article

Anthropogenically driven differences in n-alkane distributions of surface sediments from 19 lakes along the middle Yangtze River, Eastern China

Yongdong Zhang, Yaling Su, Jinlei Yu, Zhengwen Liu, more

Environmental Science and Pollution Research > 2019 > 26 > 22 > 22472- 22484

During the past few decades, the Yangtze River basin has undergone massive anthropogenic change. In order to evaluate the impacts of human interventions on sediment n-alkanes of lakes across this region, the aliphatic hydrocarbon fractions of 19 surface sediment samples collected from lakes along the middle reaches of the Yangtze River (MYR) were analyzed using gas chromatography–mass spectrometry...

article

Fractionation of Dissolved Organic Matter by Co-Precipitation with Iron: Effects of Composition

Yingxun Du, Cesar E. Ramirez, Rudolf Jaffé

Environmental Processes > 2018 > 5 > 1 > 5-21

Interactions between dissolved organic matter (DOM) and different physical-chemical forms of iron (Fe) represent important biogeochemical processes in the organic carbon cycle. Due to the effect of climate change and anthropogenic activities such as land-use change, the loading of terrestrial DOM into aquatic systems is increasing, and thus, enhancing the organic matter-based acidity in aquatic ecosystems...

article

Climatic and watershed controls of dissolved organic matter variation in streams across a gradient of agricultural land use

Peng Shang, YueHan Lu, YingXun Du, Rudolf Jaffé, more

Science of The Total Environment > 2018 > 612 > C > 1442-1453

Human land use has led to significant changes in the character of dissolved organic matter (DOM) in lotic ecosystems. These changes are expected to have important environmental and ecological consequences. However, high spatiotemporal variability has been reported in previous studies, and the underlying mechanisms remain inadequately understood. This study assessed variation in the properties of stream...

article

Interactions of riverine suspended particulate matter with phosphorus inactivation agents across sediment-water interface and the implications for eutrophic lake restoration

Hongbin Yin, Yingxun Du, Ming Kong, Cheng Liu

Chemical Engineering Journal > 2017 > 327 > C > 150-161

Phosphorus (P) inactivation agents (PIAs) have been widely used in lakes for eutrophic management. However, the interactions of riverine suspended particulate matter (SPM) with PIAs have not been elucidated to the point of complete confidence in the success of PIA application to eutrophic lakes. In this study, a long-term field incubation experiment was carried out to investigate the effects of riverine...

article

Photochemical reactivities of dissolved organic matter (DOM) in a sub-alpine lake revealed by EEM-PARAFAC: An insight into the fate of allochthonous DOM in alpine lakes affected by climate change

Yingxun Du, Yuanyuan Zhang, Feizhou Chen, Yuguang Chang, more

Science of The Total Environment > 2016 > 568 > C > 216-225

Due to climate change, tree line advance is occurring in many alpine regions. Within the next 50 to 100years, alpine lake catchments are expected to develop increased vegetation cover similar to that of sub-alpine lake catchments which currently exist below the tree line. Such changes in vegetation could trigger increased allochthonous DOM inputs to alpine lakes. To understand the fate of allochthonous...

article

A new insight into black blooms: Synergies between optical and chemical factors

Hongtao Duan, Steven Arthur Loiselle, Zuochen Li, Qiushi Shen, more

Estuarine, Coastal and Shelf Science > 2016 > 175 > C > 118-125

Black blooms have been associated with fish-kills and the loss of benthic fauna as well as closure of potable water supplies. Their frequency and duration has increased in recent decades in rivers, inland lakes and reservoirs, and has often been associated with the decay and release of organic matter (planktonic algae, aquatic macrophytes, sediment release, etc.). However, the interactions between...

article

The role of dissolved oxygen in the Ta(O)N-driven visible Fenton-like degradation of atrazine

Yuanyuan Zhang, Yingxun Du, Deqi Liu, Wenjuan Bian

Journal of Environmental Chemical Engineering > 2014 > 2 > 3 > 1691-1698

The role of dissolved oxygen (DO) in a visible Fenton-like degradation of atrazine driven by Ta(O)N was examined in detail. First, Ta(O)N samples were prepared by the nitridation of Ta ₂ O ₅ nanoparticles, which showed strong absorption in the range of 300–600nm. Second, the degradation of atrazine, the decomposition of H ₂ O ₂ , and the formation of intermediates in...

article

Photodegradation of gallic acid under UV irradiation: Insights regarding the pH effect on direct photolysis and the ROS oxidation-sensitized process of DOM

Yingxun Du, Hui Chen, Yuanyuan Zhang, Yuguang Chang

Chemosphere > 2014 > 99 > Complete > 254-260

In this study, the degradation of gallic acid (GA), a model compound for dissolved organic matter (DOM) in controlled UV/N ₂ , UV/air, UV/Fe ³⁺ /N ₂ , and UV/Fe ³⁺ /air systems was investigated to elucidate the contribution of direct photolysis and reactive oxygen species (ROS) oxidation to GA degradation at various pH values. In general, the order of the degradation...

article

Roles of TaON and Ta3N5 in the visible-Fenton-like degradation of atrazine

Yingxun Du, Lu Zhao, Yuanyuan Zhang

Journal of Hazardous Materials > 2014 > 267 > Complete > 55-61

In this study, the roles of TaON and Ta ₃ N ₅ in the degradation of atrazine by the visible-Fenton-like system were examined in detail. The TaON and Ta ₃ N ₅ samples prepared by the nitridation of Ta ₂ O ₅ and characterized by XRD, DRS, BET and PL analyses. The results showed that the TaON sample had weaker absorption in the visible region but higher...

article

Photocatalytic degradation of microcystin-LR using TiO₂ nanotubes under irradiation with UV and natural sunlight

YaLing Su, YiRong Deng, Lu Zhao, YingXun Du

Chinese Science Bulletin > 2013 > 58 > 10 > 1156-1161

In order to investigate the catalytic performance of anodic TiO₂ nanotubes and their practical application in the treatment of refractory microcystins (MCs) in natural-water samples, TiO₂ nanotubes of diameter of 50–80 nm were fabricated by anodization in C₂H₂O₄·2H₂O containing NH₄F. Under irradiation with natural sunlight, MC-LR was totally degraded after 1 d using the anodic TiO₂ nanotubes. In contrast,...

article

Tantalum (oxy)nitrides nanotube arrays for the degradation of atrazine in vis-Fenton-like process

Yingxun Du, Lu Zhao, Yuguang Chang, Yaling Su

Journal of Hazardous Materials > 2012 > 225-226 > Complete > 21-27

In order to overcome the limitation of the application of nanoparticles, tantalum (oxy)nitrides nanotube arrays on a Ta foil were synthesized and introduced in vis (visible light)-Fenton-like system to enhance the degradation of atrazine. At first, the anodization of tantalum foil in a mild electrolyte solution containing ethylene glycol and water (v:v=2:1) plus 0.5wt.% NH ₄ F produced tantala...

article

Tantalum (oxy)nitrides: Preparation, characterisation and enhancement of photo-Fenton-like degradation of atrazine under visible light

Yingxun Du, Lu Zhao, Yaling Su

Journal of Hazardous Materials > 2011 > 195 > Complete > 291-297

Tantalum (oxy)nitrides were prepared by the nitridation of Ta ₂ O ₅ and were added to a photo-Fenton-like system to enhance Fe ³⁺ reduction and atrazine degradation under visible light. The samples were characterized by XRD, XPS, DRS and BET analyses. XPS analysis showed that the nitrogen content of the tantalum (oxy)nitride samples increased noticeably with the nitridation...

article

Preparation, photocatalytic performance and electronic structures of visible-light-driven Fe–N-codoped TiO2 nanoparticles

Yaling Su, Yutang Xiao, Yi Li, Yingxun Du, more

Materials Chemistry and Physics > 2011 > 126 > 3 > 761-768

Fe–N-codoped TiO ₂ powder prepared by sol–gel method is loaded on low-density polyethylene film to obtain immobilized photocatalyst. The obvious agglomeration phenomena exist in the annealed samples with nanometer size, as observed in SEM images. XRD results suggest that the adding amount of impurities has a great effect on the crystallinity and particle size of TiO ₂ . Compared with...

article

Photodecomposition of 4-chlorophenol by reactive oxygen species in UV/air system

Yingxun Du, Q. Shiang Fu, Yi Li, Yaling Su

Journal of Hazardous Materials > 2011 > 186 > 1 > 491-496

In this article, the photo-degradation of 4-chlorophenol (4-CP) under UV irradiation was studied with focus on the photodecomposition of 4-CP by reactive oxygen species (ROS). 4-CP underwent much faster and more complete degradation in UV/air system than in UV/N ₂ system. In UV/air system, the addition of t-butanol, a well-known ^• OH scavenger, significantly impeded the degradation...

article

I-doping of anodized TiO₂ nanotubes using an electrochemical method

YaLing Su, YuTang Xiao, YingXun Du, Shiang Fu

Chinese Science Bulletin > 2010 > 55 > 20 > 2136-2141

In order to obtain TiO₂ with high photocatalytic activity, a cathode reduction was used to dope I⁷⁺ and I⁵⁺ into TiO₂ nanotubes of anodized Ti in C₂H₂O₄ · 2H₂O + NH₄F electrolyte. SEM images show that the anodization method integrated the preparation with the doping process, which for nonmetals-doping is advantageous to maintain the morphological integrity of TiO₂ nanotubes. I⁷⁺-I⁵⁺-doping enhances...

article

Catalytic conversion of NaHCO3 into formic acid in mild hydrothermal conditions for CO2 utilization

Bing Wu, Ying Gao, Fangming Jin, Jianglin Cao, more

Catalysis Today > 2009 > 148 > 3-4 > 405-410

The increasing atmospheric CO ₂ level causes global warming and may pose catastrophic effects to the humanity. Among the various options to reduce the CO ₂ atmospheric loading, hydrothermal reactions may have a high potential for rapidly and effectively converting CO ₂ into useful chemicals. In this study, the hydrothermal conversion of CO ₂ into formic acid was carried...

article

Role of oxygen in the degradation of atrazine by UV/Fe(III) process

Yingxun Du, Yaling Su, Lecheng Lei, Xingwang Zhang

Journal of Photochemistry & Photobiology, A: Chemistry > 2009 > 208 > 1 > 7-12

In this study, the role of oxygen in the regeneration of Fe(III) during the degradation of atrazine in UV/Fe(III) process was studied. The degradations of atrazine in UV/Fe(III) and UV-photolysis processes in the presence and absence of oxygen were compared. The results showed that the degradations of atrazine in these processes followed the pseudo-first-order kinetics well. The process exhibiting...

article

Alkaline pre-treatment of rice hulls for hydrothermal production of acetic acid

Yamin Hsieh, Yingxun Du, Fangming Jin, Zhouyu Zhou, more

Chemical Engineering Research and Design > 2009 > 87 > 1 > 13-18

To solve the blockage caused by silica during the hydrothermal conversion of rice hulls into acetic acid in a continuous-flow reactor, the removal of silica from rice hulls and the retainment of organics by alkaline extraction were carried out in a range of pH values from 5 to 12 and temperatures from 30 to 85°C. It was found that the efficiency of silica removal and organics retainment strongly depended...

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INFONA - science communication portal

Search results for: Yingxun Du

The dual roles of dissimilatory iron reduction in the carbon cycle: The “iron mesh” effect can increase inorganic carbon sequestration

Water depth and transparency drive the quantity and quality of organic matter in sediments of Alpine Lakes on the Tibetan Plateau

Anthropogenically driven differences in n-alkane distributions of surface sediments from 19 lakes along the middle Yangtze River, Eastern China

Fractionation of Dissolved Organic Matter by Co-Precipitation with Iron: Effects of Composition

Climatic and watershed controls of dissolved organic matter variation in streams across a gradient of agricultural land use

Interactions of riverine suspended particulate matter with phosphorus inactivation agents across sediment-water interface and the implications for eutrophic lake restoration

Photochemical reactivities of dissolved organic matter (DOM) in a sub-alpine lake revealed by EEM-PARAFAC: An insight into the fate of allochthonous DOM in alpine lakes affected by climate change

A new insight into black blooms: Synergies between optical and chemical factors

The role of dissolved oxygen in the Ta(O)N-driven visible Fenton-like degradation of atrazine

Photodegradation of gallic acid under UV irradiation: Insights regarding the pH effect on direct photolysis and the ROS oxidation-sensitized process of DOM

Roles of TaON and Ta3N5 in the visible-Fenton-like degradation of atrazine

Photocatalytic degradation of microcystin-LR using TiO₂ nanotubes under irradiation with UV and natural sunlight

Tantalum (oxy)nitrides nanotube arrays for the degradation of atrazine in vis-Fenton-like process

Tantalum (oxy)nitrides: Preparation, characterisation and enhancement of photo-Fenton-like degradation of atrazine under visible light

Preparation, photocatalytic performance and electronic structures of visible-light-driven Fe–N-codoped TiO2 nanoparticles

Photodecomposition of 4-chlorophenol by reactive oxygen species in UV/air system

I-doping of anodized TiO₂ nanotubes using an electrochemical method

Catalytic conversion of NaHCO3 into formic acid in mild hydrothermal conditions for CO2 utilization

Role of oxygen in the degradation of atrazine by UV/Fe(III) process

Alkaline pre-treatment of rice hulls for hydrothermal production of acetic acid

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