Article
Environmental Sciences
Xiangyang Gui, Bingqing Song, Ming Chen, Xiaoyun Xu, Zhefan Ren, Xing Li, Xinde Cao
Summary: This study found that soil kaolin, goethite, and humic acid colloids have significant effects on the stability and aggregation of biochar colloids. Kaolin and humic acid can enhance the stability of biochar colloids, while goethite can rapidly combine with biochar colloids, leading to aggregation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Yang Zhou, Jianpeng Hu, Yuan Gao, Yang Song, Su-Yan Pang, Jin Jiang
Summary: This study systematically investigated the transformation of fluoroquinolones (FQs) by the oxidant permanganate (Mn(VII)) in the presence or absence of humic acid (HA) in aquatic environments. It was found that HA could accelerate the degradation of FQs by Mn(VII) oxidation, with the in situ formed MnO2 acting as a catalyst. The study also proposed an activation method based on Mn(VII) and reductants for the treatment of FQs contaminated water.
CHINESE CHEMICAL LETTERS
(2022)
Article
Environmental Sciences
Shunan Dong, Wangwei Cai, Jihong Xia, Liting Sheng, Weimu Wang, Hui Liu
Summary: The aggregation kinetics of fragmental polyethylene glycol terephthalate (PET) nanoplastics in aqueous environment were studied under various chemistry conditions. It was found that the aggregation of PET nanoplastics increased with higher electrolyte concentrations and lower solution pH, especially in the presence of divalent cations. Additionally, the presence of humic acid was shown to significantly inhibit the aggregation of PET nanoplastics.
ENVIRONMENTAL POLLUTION
(2021)
Article
Engineering, Environmental
N. Pichel, H. Lubarsky, A. Afkhami, V. Baldasso, L. Botero, J. Salazar, M. Hincapie, J. A. Byrne, P. Fernandez-Ibanez
Summary: The study assessed the impact of particulate matter and NOM on UVC disinfection efficiency, finding that the presence of HA significantly reduced the inactivation rate of MS2, while turbidity had a minimal effect on UVC disinfection efficiency.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Yan Wang, Song Shu, Min Peng, Lin Hu, Xiaoshu Lv, Yu Shen, Haifeng Gong, Guangming Jiang
Summary: This study developed a dual-site NRR electrocatalyst with high activity and selectivity for the reduction of nitrate to ammonia. Experimental and theoretical analyses revealed the roles of MnO2-O-v in adsorbing, immobilizing, and activating nitrogen intermediates, while Pd provided sufficient hydrogen for the NRR process, leading to enhanced efficiency.
Article
Chemistry, Analytical
Ruishuang Xu, Mengjiu Zhao, Zhengqiang Chen, Zhihong Gao, Haiyan Song, Taicheng An, Shengrun Zheng, Fenglong Gu
Summary: The study demonstrates that penthiopyrad is rapidly degraded in the presence of MnO2, with sulfoxides, sulfones, and diketones identified as the main degradation products. Environmental factors such as temperature, pH, and the presence of humic acid were found to impact the degradation of penthiopyrad by delta-MnO2. The theoretical guidance provided by the study offers insights into the potential fate of penthiopyrad in natural environments.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2021)
Article
Environmental Sciences
Liqiang Tan, Yuxiang Wang, Song Wang, Caijin Wu, Dong Li, Yisheng Chen, Haocheng Wang
Summary: Batch techniques were developed to assess the aggregation mechanisms of humic acid (HA) reacting with Cs+ or Co2+ electrolyte ions. The results showed that Co2+ ions were more effective in promoting the aggregation of HA compared to Cs+ ions.
Article
Engineering, Environmental
Yuheng Chen, Ruijuan Liu, Xinni Wu, Yuan Liu, Jianwei Fu, Huase Ou
Summary: The study found that potassium permanganate oxidation can enhance the sinking performance of microplastics, positively impacting the removal efficiency in water treatment plants. Different polymer types show varying effects on treatment outcomes, with polyethylene exhibiting persistent characteristics that warrant special attention.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hai Wu, Yan Wang, Binbin Sun, Xinwei Liu, Tianxu Zhang, Yufei Ma, Shuyan Zhao
Summary: In this study, the effects of different types and concentrations of natural organic matter (NOM) on the stability of hematite nanoparticles (NPs) in solutions with monovalent and divalent cations were investigated. It was found that the surface functional groups and conformational structures of NOM played a crucial role in determining the stability of NPs. The presence of humic acid (HA) increased the stability of hematite NPs due to electrostatic and steric repulsion, while the presence of protein (BSA) showed non-linear effects on NP stability.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Article
Engineering, Environmental
Chang-Long Feng, Cheng Liu, Meng-Yao Yu, Shi-Qi Chen, Tariq Mehmood
Summary: Ultrafiltration coupled with humic acid complexation is an effective strategy for removing manganese from groundwater. The maximum removal efficiency can reach over 90% at a certain C/Mn molar ratio. The removal of Mn(II) is influenced by transmembrane pressure, solution pH, and coexisting cations. The UF membrane effectively rejects the macromolecular complexes formed by the complexation of Mn(II) and humic acid.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Liang Mu, Huixing Zhao, Ziqi Zhou, Jiguang Zeng, Qingyan Cui
Summary: This study investigates the use of fulvic acid (FA) as a hydrate promoter for solidified natural gas (SNG) and its effect on the formation kinetics and storage capacity of methane hydrates. The presence of FA significantly reduces the induction time and accelerates the gas uptake rate of methane hydrates. The methane storage capacity in the FA solution is much higher than that of pure water and sodium dodecyl sulfate (SDS) solution. High pressure and low temperature are favorable for achieving high gas uptake. The methane hydrates formed in the FA solution are in a small-grained form, suggesting the anti-agglomerant effect of FA.
Article
Engineering, Environmental
Ruifeng Zhang, Chuanyun Yang, Qiuyan Niu, Jing Yang
Summary: In this study, manganese oxide (MnOx) extracted from backwashing sludge was found to effectively activate peroxymonosulfate (PMS) for the removal of humic acid from water. The thermal treatment of MnOx significantly improved its catalytic activity. The experiments provided a new strategy for recycling MnOx from sludge for water treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Yu Kong, Xiaona Li, Mengna Tao, Xuesong Cao, Zhenyu Wang, Baoshan Xing
Summary: This study reveals the significant effects of dissolved organic carbon, humic acid, calcium ions, and pH on the aggregation of polystyrene nanoplastics (PSNPs), which contribute to a better understanding of the behavior and risk assessment of nanoplastics in aquatic environments.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Agricultural Engineering
Wei Tang, Xinxing Wu, Caoxing Huang, Zhe Ling, Chenhuan Lai, Qiang Yong
Summary: This study developed a novel biorefinery method for waste wheat straw, in which a natural surfactant humic acid was used during acidic pretreatment to enhance enzymatic saccharification efficiency. The success of enzymatic digestion was attributed to improved accessibility of cellulose to cellulase and structural changes in lignocellulose. These findings suggest that humic acid may be a beneficial surfactant in biorefinery processes and could potentially inspire research into other natural surfactants.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Jing Li, Xin Hu, Juan Wang, Youru Yao, Yong Zhang, Lixiao Ni, Shiyin Li
Summary: This study investigates the mechanism by which extracellular polymeric substances (EPS) influence the oxidation of phenol by permanganate (Mn (VII)). The results show that EPS significantly enhances the oxidation efficiency of Mn (VII) for phenol by promoting the formation and stability of EPS-MnO2 colloids.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)