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Wang Y, Zhao Q, Guo Y, Hu S, Tian G, Zhang M, Cao X, Liu H, Zhang J. Interfacial interactions of nanoscale zero-valent iron particles with clay minerals in the aquatic environments: Experimental and theoretical calculation study. WATER RESEARCH 2024; 264:122220. [PMID: 39116613 DOI: 10.1016/j.watres.2024.122220] [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: 04/22/2024] [Revised: 08/02/2024] [Accepted: 08/03/2024] [Indexed: 08/10/2024]
Abstract
The environmental transport and fate of nanoscale zero-valent iron particles (nZVI) in soil and groundwater can be altered by their hetero-aggregation with clay mineral particles (CMP). This study examines the interactions between bare or carboxymethyl cellulose (CMC)-coated nZVI with typical CMP, specifically kaolinite and montmorillonite. Methods include co-settling experiments, aggregation kinetic studies, electron microscopy, Derjaguin-Landau-Verwey-Overbeek (DLVO) and extended DLVO (EDLVO) energy analysis, and density functional theory calculations, focusing on the pH dependency of these interactions. The EDLVO theory effectively described the interactions between nZVI and CMP in aquatic environments. Under acidic conditions (pH 3.5), the interfacial interaction between bare nZVI and kaolinite is regulated by van der Waals forces, while complexation, van der Waals forces, and electrostatic attraction govern the interaction of bare nZVI with montmorillonite, primarily depositing on the SiO face. In contrast, the positively charged AlO face and edge of CMP are the main deposition sites for CMC-coated nZVI through hydrogen bonding, van der Waals forces, and electrostatic attraction. At neutral (pH 6.5) and alkaline (pH 9.5) conditions, both bare and CMC-coated nZVI predominantly attach to the AlO face and edge, facilitated by complexation or hydrogen bonding, alongside van der Waals forces. The attachment of CMC-coated nZVI to CMP surfaces shows reversible aggregation or deposition due to the steric repulsion from the CMC coating. These findings hold significant implications for the environmental applications and risk of nZVI.
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Affiliation(s)
- Yanlong Wang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao 266590, China
| | - Qinghui Zhao
- Center for Soil Pollution Control of Shandong, Department of Ecological Environment Shandong Province, Jinan 250101, China
| | - Yuanfeng Guo
- Qingdao Huayi Environmental Protection Science & Technology CO., LTD, Qingdao 266000, China
| | - Shugang Hu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Guoqing Tian
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Mengcheng Zhang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Xiaoqiang Cao
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao 266590, China
| | - Huaqing Liu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao 266590, China.
| | - Jian Zhang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao 266590, China; School of Geographical Environment, Shandong Normal University, Jinan 250358, China
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Malloy J, Marlowe E, Jensen CJ, Liu IS, Hulse T, Murray AF, Bryan D, Denes TG, Gilbert DA, Yin G, Liu K. Microstructure-dependent particulate filtration using multifunctional metallic nanowire foams. NANOSCALE 2024; 16:15094-15103. [PMID: 39076072 DOI: 10.1039/d4nr02368d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/31/2024]
Abstract
The COVID-19 pandemic has shown the urgent need for the development of efficient, durable, reusable and recyclable filtration media for the deep-submicron size range. Here we demonstrate a multifunctional filtration platform using porous metallic nanowire foams that are efficient, robust, antimicrobial, and reusable, with the potential to further guard against multiple hazards. We have investigated the foam microstructures, detailing how the growth parameters influence the overall surface area and characteristic feature size, as well as the effects of the microstructures on the filtration performance. Nanogranules deposited on the nanowires during electrodeposition are found to greatly increase the surface area, up to 20 m2 g-1. Surprisingly, in the high surface area regime, the overall surface area gained from the nanogranules has little correlation with the improvement in capture efficiency. However, nanowire density and diameter play a significant role in the capture efficiency of PM0.3 particles, as do the surface roughness of the nanowire fibers and their characteristic feature sizes. Antimicrobial tests on the Cu foams show a >99.9995% inactivation efficiency after contacting the foams for 30 seconds. These results demonstrate promising directions to achieve a highly efficient multifunctional filtration platform with optimized microstructures.
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Affiliation(s)
- James Malloy
- Department of Physics, Georgetown University, Washington, DC 20057, USA.
| | - Erin Marlowe
- Department of Physics, Georgetown University, Washington, DC 20057, USA.
| | | | - Isaac S Liu
- Department of Physics, Georgetown University, Washington, DC 20057, USA.
- Department of Computer Science, Vanderbilt University, Nashville, TN 37235, USA
| | - Thomas Hulse
- Department of Physics, Georgetown University, Washington, DC 20057, USA.
- Department of Physics, University of Louisville, Louisville, KY 40292, USA
| | - Anne F Murray
- Department of Food Science, University of Tennessee, Knoxville, TN, 37996, USA
| | - Daniel Bryan
- Department of Food Science, University of Tennessee, Knoxville, TN, 37996, USA
| | - Thomas G Denes
- Department of Food Science, University of Tennessee, Knoxville, TN, 37996, USA
| | - Dustin A Gilbert
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Gen Yin
- Department of Physics, Georgetown University, Washington, DC 20057, USA.
| | - Kai Liu
- Department of Physics, Georgetown University, Washington, DC 20057, USA.
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Zeng C, Hu H, Wang C, Shi Q, Zhang Q, Chen M, Wang Q, Zhang T. New insight into the changes in metal-phosphonate complexes from the addition of CaCO 3 to enhance ferric flocculation for efficient phosphonate removal. CHEMOSPHERE 2023; 311:137078. [PMID: 36328319 DOI: 10.1016/j.chemosphere.2022.137078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 10/26/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
Due to the stable chelating effect of organic phosphonates in wastewater, phosphonates with increasing emission are difficult to be removed effectively by traditional ferric salt flocculation, which has posed tough challenges for reducing total phosphorus pollution in recent years. In this work, calcium carbonate (CaCO3) was introduced to work together with the widely investigated flocculant of ferric chloride (FeCl3) to realize an efficient removal of nitrilotrismethylenephosphonic acid (NTMP) at much lower dosage of FeCl3. With an aid of synergy effect from together use of CaCO3 and FeCl3, the remaining concentration as low as 0.16 mg-P/L, far below the sewage discharge limit (0.5 mg-P/L), was simply obtained with a significantly reduced Fe/P molar ratio at only 4, resulting from calcium source donor to form more stable Fe-Ca-P tridentate bridging complexes, high affinity towards ferric ions on CaCO3 surface and slow-release alkaline from CaCO3. A comparison among sodium hydroxide (NaOH), calcium hydroxide (Ca(OH)2) and CaCO3 as additives, was carried out to highlight the advantages of using CaCO3 and clarify the mechanism for the greatly improved performance by a set of characterizations including XRD, FTIR, Zeta potential, XPS, SEM-EDS and TG analyses. The addition of CaCO3 in ferric flocculation resulted in further obvious advantages such as 75% shortened settling time and only one-third of sludge volume of the precipitant, beneficial to the sample handling in engineering application. The proposed new approach has been further confirmed to work efficiently on real phosphonate-containing wastewater. Discussion on the interaction between CaCO3 and ferric salts in phosphonate solutions shed new insights into the working mechanism of using CaCO3 for the treatment of phosphonates-containing wastewater.
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Affiliation(s)
- Chaocheng Zeng
- School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Huimin Hu
- School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.
| | - Chao Wang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Qing Shi
- School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Qiwu Zhang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.
| | - Mengfei Chen
- School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Qian Wang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China
| | - Tingting Zhang
- School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei, 430023, China
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Pradhan S, Whitby CP, Williams MAK, Chen JLY, Avci E. Interfacial colloidal assembly guided by optical tweezers and tuned via surface charge. J Colloid Interface Sci 2022; 621:101-109. [PMID: 35452924 DOI: 10.1016/j.jcis.2022.04.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 04/05/2022] [Accepted: 04/07/2022] [Indexed: 10/18/2022]
Abstract
HYPOTHESIS The size, shape and dynamics of assemblies of colloidal particles optically-trapped at an air-water interface can be tuned by controlling the optical potential, particle concentration, surface charge density and wettability of the particles and the surface tension of the solution. EXPERIMENTS The assembly dynamics of different colloidal particle types (silica, polystyrene and carboxyl coated polystyrene particles) at an air-water interface in an optical potential were systematically explored allowing the effect of surface charge on assembly dynamics to be investigated. Additionally, the pH of the solutions were varied in order to modulate surface charge in a controllable fashion. The effect of surface tension on these assemblies was also explored by reducing the surface tension of the supporting solution by mixing ethanol with water. FINDINGS Silica, polystyrene and carboxyl coated polystyrene particles showed distinct assembly behaviours at the air-water interface that could be rationalised taking into account changes in surface charge (which in addition to being different between the particles could be modified systematically by changing the solution pH). Additionally, this is the first report showing that wettability of the colloidal particles and the surface tension of the solution are critical in determining the resulting assembly at the solution surface.
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Affiliation(s)
- Susav Pradhan
- School of Fundamental Sciences, Massey University, Palmerston North 4410, New Zealand; Department of Mechanical and Electrical Engineering, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand
| | - Catherine P Whitby
- School of Fundamental Sciences, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand.
| | - Martin A K Williams
- School of Fundamental Sciences, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand.
| | - Jack L Y Chen
- Centre for Biomedical and Chemical Sciences, Auckland University of Technology, Auckland 1010, New Zealand; Department of Biotechnology, Chemistry and Pharmaceutical Sciences, Universitá degli Studi di Siena, Siena 53100, Italy; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand
| | - Ebubekir Avci
- Department of Mechanical and Electrical Engineering, Massey University, Palmerston North 4410, New Zealand; The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand.
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