The Behavior of NOM-Cu(Ⅱ)Colloids at the Goethite Interface

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-03-26 DOI:10.1016/j.watres.2025.123562

Yuekang Chen, Lijuan Zeng, Kai Chen, Meiling Yin, Xiongkai Zheng, Yuting Zhou, Yanping Deng, Jiehong Ye, Zhi Dang, Chuling Guo

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引用次数: 0

Abstract

Natural organic matter (NOM), due to its high reactivity, often facilitates the formation of NOM-heavy metal colloids. However, the impact of mineral components on the behavior of these colloids remains poorly understood. In present research, to investigate the interfacial reaction properties of NOM-Cu(II) colloids with goethite at varying C/Cu(II) ratios, nano-sized Cu(Ⅱ) colloids with different C/Cu(Ⅱ) ratios were synthesized under aerobic conditions by combining humic acid with Cu(Ⅱ). Adsorption experiments showed that NOM-Cu(Ⅱ) colloids enhanced Cu(Ⅱ) adsorption onto goethite at low C/Cu(Ⅱ) ratios (C/Cu(Ⅱ) ≤ 25). Conversely, the adsorption of Cu(Ⅱ) was hindered at high C/Cu(Ⅱ) ratios (C/Cu(Ⅱ) ≥ 50), while Fe release is promoted, facilitating further reactions with NOM-Cu(II) colloids to form Fe-NOM-Cu(II) colloids. HR-TEM and QCM-D experimental results indicated that NOM-Cu(II) colloids aggregated and formed a softer deposit layer on mineral surfaces at low C/Cu(II) ratios. Conversely, at high C/Cu(II) ratio, HA formed a dense adsorption layer on goethite, while Fe-NOM-Cu(II) colloids were observed in the liquid phase samples. In situ ATR-FTIR spectroscopy, ITC experiments, and theoretical calculations further demonstrated that the adsorption mechanism was not dominant at low C/Cu(II) ratios. Instead, the aggregation and deposition of colloids induced by goethite promote Cu(II) adsorption. At high C/Cu(II) ratio, the suppression of Cu(II) adsorption was attributed to the formation of a dense adsorption layer by free HA, which coordinated with goethite surfaces via carboxyl groups, occupying adsorption sites. Additionally, the high concentration of HA intensified the stability of colloids in solution. This research provides crucial insights into the interactions between NOM-Cu(II) colloid and environmental minerals, elucidating the molecular mechanisms influencing colloidal behavior on mineral surfaces, which is vital for understanding the geochemical cycling of heavy metals.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.