Article
Engineering, Environmental
Kyle J. Chardi, Walter D. C. Schenkeveld, Naresh Kumar, Daniel E. Giammar, Stephan M. Kraemer
Summary: Anthropogenic and biogenic ligands can mobilize uranium from noncrystalline U-(IV) phases, and the rate and extent of mobilization are influenced by geochemical processes. Competing metals and humic substances play a crucial role in the mobilization of uranium by these ligands.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Carlo Bravo, Maria De Nobili, Alberto Gambi, Ladislau Martin-Neto, Otaciro R. Nascimento, Rosanna Toniolo
Summary: This study identified two concurrent mechanisms of electron exchange between humic substances and ABTS•, indicating fast and slow transfer processes with potentially different environmental roles. These findings provide a basis for identifying the appropriate conditions for spectrophotometric determination of the fast and slow components of humic substances' electron donating capacity.
Article
Engineering, Environmental
Qi Zhao, Mengxian Liu, Mohammad Moniruzzaman, Kaimin Shih
Summary: Understanding the dissociation behavior of long half-life radionuclides with humic acid is crucial for their migration in water environments. In this study, a modified dissociation model was developed to describe the metal dissociation behavior, and it was successfully applied to quantitatively evaluate the dissociation behavior of Eu bound to HA. The results showed that solution pH, ionic strength, and the pre-equilibrium period of Eu with HA are important factors influencing the dissociation behavior of Eu bound to HA.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Qianting Ye, Zecong Ding, Rong Li, Zhenqing Shi
Summary: This study investigated the kinetics of Cd, Ni, and Pb release from a typical fulvic acid (FA) and developed a kinetics model for predicting metal release from dissolved organic matter (DOM). The study found that Cd showed the fastest release from FA while Ni and Pb had slower release rates. The study also demonstrated that metal-FA complexes undergo different rates of dissociation in the environment, affecting the dynamic speciation and transfer of metals to other biological processes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Amanda Dorfman, Anna Wanhala, Peter Eng, Joanne Stubbs, Omar Colon, Malik Donetian, Jacquelyn N. Bracco
Summary: Understanding the sorption behavior of ions at the mineral-water interface is crucial for determining the fate of elements in the environment. This study used barite to investigate the interactions between metals, organic molecules, and ionic crystals. The results showed that the presence of ethylenediaminetetraacetic acid (EDTA) disrupted the barite surface structure and inhibited strontium (Sr) incorporation into the surface. EDTA also formed complexes with Sr in solution, limiting the amount of Sr2+ in solution. When desorbed, approximately 75% of the sorbed strontium was removed, suggesting that changes following Sr sorption in the presence of EDTA may be irreversible.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Environmental
K. Khoiruddin, D. Ariono, S. Subagjo, I. G. Wenten
Summary: By modifying AEMs with different hydrophilic additives, this study successfully increased membrane conductivity and resistance to organic fouling. The additives did not significantly affect other properties of the membrane.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Chemistry, Physical
Vincent Thoreton, Mathew Niania, John Kilner
Summary: The study investigates the oxygen transport kinetics under humidified oxygen conditions through isotopic exchange depth profiling. It reveals that the surface exchange coefficient of water is higher than that of molecular oxygen, suggesting that water tends to occupy the active exchange sites at the material surface and exchange oxygen more rapidly than molecular oxygen.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Environmental Sciences
Hao Liu, Tuo Zhang, Yan'an Tong, Qihong Zhu, Daoyou Huang, Xibai Zeng
Summary: Humic substances and calcareous substances are important components in soil and can affect the mobility of metals. This study developed a new remediation scheme for cadmium-contaminated soil by coupling humic substances and calcareous substances. The results showed that this approach effectively reduced the bioavailable cadmium concentration in soil and decreased cadmium accumulation in rice tissues.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Geochemistry & Geophysics
Xiaofeng Lin, Yang Lu, Zhenqing Shi
Summary: A quantitative model was developed to study the release of Cu(II) from Fe oxides or Fe oxide-humic substance composites. The results showed that Cu(II) release rates decreased with Fe oxide aging processes, while the presence of humic substances increased Cu(II) mobility.
APPLIED GEOCHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xiongxin Peng, Shuang Gai, Kui Cheng, Fan Yang
Summary: The study conducted hydrothermal humification kinetics experiments using corn straw as raw material and employed characterization techniques such as ultra-performance liquid chromatography, nuclear magnetic resonance spectroscopy, and Fourier-transform ion cyclotron resonance mass spectrometry to determine the formation mechanism of artificial humic substances (A-HS). The results showed that in an alkaline environment, rapid dissociation of lignocellulose can occur, with cellulose and hemicellulose being hydrolyzed into glucose and xylose, further dehydrated to form 5-hydroxy furfural and furfural, and then rehydrated to synthesize levulinic acid and other small molecular acids. These small precursors then combine with lignin fragments to form fulvic acids, humic acids, and even humin. The proposed mechanism of hydrothermal humification is of great significance for the design, synthesis, and application of A-HS in sustainable agriculture.
Article
Engineering, Chemical
Hongfang Sun, Aimin Li, Peng Shi, Xun Cao, Chen Wang, Shi Cheng
Summary: The study utilized electrodialysis to separate high-concentration NaCl and humic substances from anion exchange spent brine. Through systematic research on the characteristics of spent brine and experimental conditions, a cost-effective membrane pair suitable for treating anion exchange spent brine with high degree of aromaticity and oxygen-containing functional groups was identified.
Article
Green & Sustainable Science & Technology
Gricel Alcira Portillo Miranda, Tavares Araruna Junior, Eduardo de Albuquerque Brocchi, Hongtao Wang
Summary: The research shows that humic substances obtained from recycling mineral coal tailings can reduce the environmental impact of mining and increase soil stability. The long-term stability advantage of humic substances is clear, and their effects on stability are more pronounced over a longer period of time.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Multidisciplinary
Xiaojia Chen, Yijun Zou, Qinyu Li, Chengjian Wu, Peng Zhou, Zheng Chen, Jiping Shi, Zhijun Zhao
Summary: This study explores the effects of thermophilic bacteria on crude fiber content, carbohydrate-active enzyme genes, and microbial communities during Chinese medicine residues composting. Results demonstrate that thermophilic microbial agents can increase composting temperature, accelerate compost maturation, and promote crude fiber degradation.
Review
Engineering, Environmental
Mengjie Ma, Tianyi An, Xinyi Zou, Mabruk Adams, Chongjun Chen
Summary: This article examines the influence of humic substances (HSs) on the performance and mechanism of the anammox process. It was found that low concentrations of HSs stimulate anammox activity, while high concentrations cause inhibition. Further research is needed to explore the microscopic mechanisms of how additional HSs affect anammox in actual wastewater.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Daniele Rodrigues Barbosa, Andres Calderin Garcia, Camila da Costa Barros de Souza, Nelson Moura Brasil do Amaral Sobrinho
Summary: Herbicide application is a common practice in agricultural systems for efficient weed control. This study found a close relationship between the herbicide oxyfluorfen accumulation in vegetable production areas and the structural characteristics of humic substances, indicating higher levels of oxyfluorfen in areas with lower slope and higher organic matter and clay content, affecting the recalcitrant properties of humic acids.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Multidisciplinary
Peng Liao, Yuzhen Liang, Zhenqing Shi
ACS EARTH AND SPACE CHEMISTRY
(2019)
Article
Environmental Sciences
Yang Ding, Minqin Liu, Shimeng Peng, Junhui Li, Yuzhen Liang, Zhenqing Shi
Article
Engineering, Environmental
Yang Lu, Shiwen Hu, Fu Liu, Yuzhen Liang, Zhenqing Shi
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Engineering, Environmental
Pei Wang, Yang Lu, Shiwen Hu, Lei Tian, Yuzhen Liang, Zhenqing Shi
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Geochemistry & Geophysics
Yang Lu, Yuzhen Liang, Fu Liu, Zimeng Wang, Zhenqing Shi
Article
Geochemistry & Geophysics
Shiwen Hu, Yuzhen Liang, Tongxu Liu, Fangbai Li, Yang Lu, Zhenqing Shi
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Environmental Sciences
Yajie You, Yuzhen Liang, Shimeng Peng, Shuai Lan, Guining Lu, Xionghan Feng, Zhenqing Shi
Article
Engineering, Environmental
Yang Ding, Zhenqing Shi, Qianting Ye, Yuzhen Liang, Minqin Liu, Zhi Dang, Yujun Wang, Chongxuan Liu
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Geochemistry & Geophysics
Zhenqing Shi, Yurui Yang, Fu Liu, Yang Lu, Qianting Ye, Xiaofeng Lin, Chunhua Feng, Yuzhen Liang, Zhi Dang
Article
Environmental Sciences
Yang Ding, Qianting Ye, Minqin Liu, Zhenqing Shi, Yuzhen Liang
Summary: The properties and composition of soil dissolved organic matter (DOM) are heavily influenced by the adsorption and desorption of organic matter (OM) on soil minerals and heterotrophic microbial respiration. Organic acids, like oxalic acid, have been shown to release organic matter (OM) and stimulate microbial degradation by dissolving protective mineral phases. This study found that oxalic acid induced long-lasting impacts on soil DOM properties and composition, enhancing the degradation of certain organic compounds while increasing the accumulation of others, under anoxic soil conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Pei Wang, Yang Ding, Yuzhen Liang, Minqin Liu, Xiaofeng Lin, Qianting Ye, Zhenqing Shi
Summary: This study investigated the link between molecular composition and the proton and Cu binding ability of dissolved organic matter (DOM) using FT-ICR-MS analysis and theoretical modeling approaches. Despite the complexity of DOM composition, molecules can be divided into three representative groups with distinct chemical properties, providing a new approach for developing mechanistic models for metal reactions with DOM.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Liyan Deng, Fu Liu, Zecong Ding, Yuzhen Liang, Zhenqing Shi
Summary: Fe(II)-bearing clay minerals are abundant in soils and play a critical role in controlling the fate of hexavalent chromium (Cr(VI)), a highly toxic substance. However, the influence of co-existing natural organic matter (NOM) on the reduction of Cr(VI) by Fe(II)-bearing clay minerals is poorly understood. This study investigated the kinetics of Cr(VI) reduction by a typical Fe(II)-bearing clay mineral in the presence of NOM. The results showed that NOM inhibited Cr(VI) reduction mainly by decreasing its sorption on the clay mineral. Additionally, soluble and mobile Cr(III) complexes were formed during the reduction process. The rate of reduction initially decreased with increasing NOM concentration, but then increased at higher concentrations, likely due to promotion effects offsetting the inhibitory effect of competitive sorption between Cr(VI) and NOM.
Article
Environmental Sciences
Xinyi Huang, Yuzhen Liang, Qianting Ye, Zecong Ding, Fu Liu, Zhenqing Shi
Summary: The molecular fractionation of dissolved organic matter (DOM) at the mineral-liquid interfaces in soil changes its molecular composition, thus affecting its reactivity, such as proton and metal binding properties. Understanding the compositional changes of DOM molecules after adsorptive fractionation by minerals is crucial for predicting the cycling of organic carbon (C) and metals in the ecosystem.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Yang Lu, Shiwen Hu, Zheng Liang, Mengqiang Zhu, Zimeng Wang, Xiaoming Wang, Yuzhen Liang, Zhi Dang, Zhenqing Shi
ENVIRONMENTAL SCIENCE-NANO
(2020)
Article
Chemistry, Multidisciplinary
Yang Ding, Yang Lu, Peng Liao, Shimeng Peng, Yuzhen Liang, Zhang Lin, Zhi Dang, Zhenqing Shi
ENVIRONMENTAL SCIENCE-NANO
(2019)