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Jin X, Guo C, Tao X, Li X, Xie Y, Dang Z, Lu G. Divergent redistribution behavior of divalent metal cations associated with Fe(II)-mediated jarosite phase transformation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 350:124004. [PMID: 38641039 DOI: 10.1016/j.envpol.2024.124004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 04/06/2024] [Accepted: 04/16/2024] [Indexed: 04/21/2024]
Abstract
The Fe(II)/Fe(III) cycle is an important driving force for dissolution and transformation of jarosite. Divalent heavy metals usually coexist with jarosite; however, their effects on Fe(II)-induced jarosite transformation and different repartitioning behavior during mineral dissolution-recrystallization are still unclear. Here, we investigated Fe(II)-induced (1 mM Fe(II)) jarosite conversion in the presence of Cd(II), Mn(II), Co(II), Ni(II) and Pb(II) (denoted as Me(II), 1 mM), respectively, under anaerobic condition at neutral pH. The results showed that all co-existing Me(II) retarded Fe(II)-induced jarosite dissolution. In the Fe(II)-only system, jarosite first rapidly transformed to lepidocrocite (an intermediate product) and then slowly to goethite; lepidocrocite was the main product. In Fe(II)-Cd(II), -Mn(II), and -Pb(II) systems, coexisting Cd(II), Mn(II) and Pb(II) retarded the above process and lepidocrocite was still the dominant conversion product. In Fe(II)-Co(II) system, coexisting Co(II) promoted lepidocrocite transformation into goethite. In Fe(II)-Ni(II) system, jarosite appeared to be directly converted into goethite, although small amounts of lepidocrocite were detected in the final product. In all treatments, the appearance or accumulation of lepidocrocite may be also related to the re-adsorption of released sulfate. By the end of reaction, 6.0 %, 4.0 %, 76.0 % 11.3 % and 19.2 % of total Cd(II), Mn(II), Pb(II) Co(II) and Ni(II) were adsorbed on the surface of solid products. Up to 49.6 %, 44.3 %, and 21.6 % of Co(II), Ni(II), and Pb(II) incorporated into solid product, with the reaction indicating that the dynamic process of Fe(II) interaction with goethite may promote the continuous incorporation of Co(II), Ni(II), and Pb(II).
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Affiliation(s)
- Xiaohu Jin
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China
| | - Chuling Guo
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China
| | - Xueqin Tao
- College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Xiaofei Li
- School of Environmental and Chemical Engineering, Foshan University, 528000, Foshan, China
| | - Yingying Xie
- School of Chemistry and Environmental Engineering, Hanshan Normal University, Guangdong, Chaozhou, 521041, China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, China
| | - Guining Lu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China.
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Wang X, Meng L, Hu M, Gao L, Lian B. The competitive and selective adsorption of heavy metals by struvite in the Pb(II)-Cd(II)-Zn(II) composite system and its environmental significance. WATER RESEARCH 2024; 250:121087. [PMID: 38171180 DOI: 10.1016/j.watres.2023.121087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 12/23/2023] [Accepted: 12/28/2023] [Indexed: 01/05/2024]
Abstract
The prevalence of struvite and other phosphate minerals in eutrophic environments has a significant effect on the transport and transformation of environmental heavy metals, but their competitive immobilization characteristics and mechanisms for heavy metals remain unclear. Three different sources of struvite (BS, CSHS, and CSS) were obtained respectively by biosynthesis and chemical synthesis with or without humic acid to investigate their competitive immobilization characteristics and mechanism of heavy metals in the Pb(II)-Cd(II)-Zn(II) composite system. The results showed that the immobilization of heavy metals by struvite is physico-chemical adsorption and the affinity (in descending order) is Pb(II) >> Cd(II)/Zn(II). Cd(II) promotes the immobilization of Pb(II)/Zn(II) by BS. The order of the selective strength by struvite for Pb(II) is BS >> CSS ≈ CSHS. The study indicates that the difference between struvite holding heavy metal ions is related to the material composition and heavy metal types, and BS shows best selective immobilization for Pb(II) in the Pb(II)-Cd(II)-Zn(II) composite system. This study provides a theoretical basis for understanding the environmental geochemical role and eco-environmental effects of struvite.
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Affiliation(s)
- Xingxing Wang
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China
| | - Lei Meng
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China
| | - Mingyang Hu
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China
| | - Lei Gao
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China
| | - Bin Lian
- College of Life Science, College of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China.
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Wang Z, Lu Q, Liu C, Tian H, Wang J, Xie L, Liu Q, Zeng H. Nanoscale Insights into the Interaction Mechanism Underlying the Adsorption and Retention of Heavy Metal Ions by Humic Acid. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024. [PMID: 38247403 DOI: 10.1021/acs.est.3c08309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
The mobility and distribution of heavy metal ions (HMs) in aquatic environments are significantly influenced by humic acid (HA), which is ubiquitous. A quantitative understanding of the interaction mechanism underlying the adsorption and retention of HMs by HA is of vital significance but remains elusive. Herein, the interaction mechanism between HA and different types of HMs (i.e., Cd(II), Pb(II), arsenate, and chromate) was quantitatively investigated at the nanoscale. Based on quartz crystal microbalance with dissipation tests, the adsorption capacities of Pb(II), Cd(II), As(V), and Cr(VI) ionic species on the HA surface were measured as ∼0.40, ∼0.25, ∼0.12, and ∼0.02 nmol cm-2, respectively. Atomic force microscopy force results showed that the presence of Pb(II)/Cd(II) cations suppressed the electrostatic double-layer repulsion during the approach of two HA surfaces and the adhesion energy during separation was considerably enhanced from ∼2.18 to ∼5.05/∼4.18 mJ m-2. Such strong adhesion stems from the synergistic metal-HA complexation and cation-π interaction, as evidenced by spectroscopic analysis and theoretical simulation. In contrast, As(V)/Cr(VI) oxo-anions could form only weak hydrogen bonds with HA, resulting in similar adhesion energies for HA-HA (∼2.18 mJ m-2) and HA-As(V)/Cr(VI)-HA systems (∼2.26/∼1.96 mJ m-2). This work provides nanoscale insights into quantitative HM-HA interactions, improving the understanding of HMs biogeochemical cycling.
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Affiliation(s)
- Zhoujie Wang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
| | - Qiuyi Lu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Chaopeng Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
| | - Huadong Tian
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
| | - Jingyi Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Lei Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
| | - Qi Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
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Wang Z, Tian H, Liu J, Wang J, Lu Q, Xie L. Facet-dependent adsorption of heavy metal ions on Janus clay nanosheets. JOURNAL OF HAZARDOUS MATERIALS 2024; 461:132548. [PMID: 37722327 DOI: 10.1016/j.jhazmat.2023.132548] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 09/05/2023] [Accepted: 09/11/2023] [Indexed: 09/20/2023]
Abstract
Understanding the facet-dependent adsorption behavior and mechanism of heavy metal ions (HMs) on two-dimensional (2D) Janus nanoclays has important implications for the environment and ecosystem but still remains elusive. Herein, ultrathin Janus serpentene (2D serpentine) nanosheets were fabricated via a facile, nontoxic, and residue-free exfoliation strategy. Fabricated serpentene nanosheets exhibited promising Cd(II) and Pb(II) adsorption capacities due to their high surface areas and abundant active sites, approximately four times higher than those of bulk serpentine powders. Interestingly, Cd(II) and Pb(II) adsorption on serpentene nanosheets exhibited a facet-dependent feature, with the adsorption amount on the Mg-OH plane considerably higher than that on the Si-O plane. This facet-dependent adsorption behavior was mainly attributed to the difference in the interaction mechanisms of HMs with the Mg-OH (monodentate inner-sphere complexation) and Si-O (outer-sphere complexation) planes, which was further confirmed via density functional theory calculations. The Cd(II) adsorption on serpentene nanosheets was limited by strong kinetic restrictions (e.g., stronger electrostatic repulsion and higher dehydration energy barrier than that for Pb(II) adsorption). This study provides insights into the facet-dependent adsorption mechanisms of HMs on Janus serpentene nanosheets, which can be extended to other nanoclays used in wastewater treatment and many environmental processes.
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Affiliation(s)
- Zhoujie Wang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, PR China
| | - Huadong Tian
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, PR China
| | - Jing Liu
- State Key Laboratory of NBC Protection for Civilian, Institute of Chemical Defense, Beijing 100191, PR China
| | - Jingyi Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China
| | - Qingye Lu
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, AB, Canada
| | - Lei Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, PR China.
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Wang Z, Xiang Y, Wang D, Xu L, Xing Y, Gao Z, Sun W, Xie L. Facet-Dependent Charge Density of Serpentine: Nanoscopic Implications for Aggregation and Entrainment of Fine Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:19027-19036. [PMID: 38088916 DOI: 10.1021/acs.langmuir.3c03227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
Deciphering the facet-dependent surface properties of clay minerals holds vital significance in both fundamental research and practical engineering applications. To date, the anisotropic local charge density of serpentine surfaces still remains elusive, and thus, the interaction energies and associated aggregate structures between different crystal planes of serpentine cannot be quantitatively determined. In this work, different crystal planes of serpentine (i.e., SiO basal, MgOH basal, and edge) were selectively exposed, and their surface potentials and charge densities were determined using atomic force microscopy (AFM) force measurements coupled with Derjaguin-Landau-Verwey-Overbeek (DLVO) theory fitting. The SiO and edge planes consistently exhibited a permanently negative surface charge, whereas the point of zero charge (PZC) on the MgOH plane was estimated to be pH 9.0-11.0. Based on the interaction energy calculation between different serpentine planes, the aggregation structures of serpentine were predicted. Combined with scanning electron microscopy observation of freeze-dried samples, SiO-MgOH and MgOH-edge associations were found to dominate the aggregate structures at pH ≤ 9.0, thereby resulting in a stacking or "card-houses" structures. In contrast, all of the plane associations exhibited the repulsive interaction energy at pH 11.0, which led to a completely dispersed system, ultimately causing the most severe fine particle entrainment during froth flotation. Our work provides quantitative clarification of facet-dependent surface properties and aggregate structures of serpentine under different pH conditions, which will help improve the fundamental understanding of colloidal behaviors of clay minerals.
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Affiliation(s)
- Zhoujie Wang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, P. R. China
| | - Yan Xiang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, P. R. China
| | - Donghui Wang
- Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, P. R. China
| | - Longhua Xu
- Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, P. R. China
| | - Yaowen Xing
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
| | - Zhiyong Gao
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
| | - Wei Sun
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
| | - Lei Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, P. R. China
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, P. R. China
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