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Jiang H, Bu J, Bian K, Su J, Wang Z, Sun H, Wang H, Zhang Y, Wang C. Surface change of microplastics in aquatic environment and the removal by froth flotation assisted with cationic and anionic surfactants. WATER RESEARCH 2023; 233:119794. [PMID: 36868113 DOI: 10.1016/j.watres.2023.119794] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 01/29/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
Microplastics (MPs) are increasingly released into the environment due to the widespread usage and improper management of plastics. Considerable research efforts have been devoted to the remediation of MPs. Froth flotation has been demonstrated as an effective method to remove MPs in water and sediment. However, there is a lack of knowledge on the regulation of the hydrophobicity/hydrophilicity of MPs surfaces. We found that exposure to the natural environment resulted in the increased hydrophilicity of MPs. The flotation efficiencies of polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), and polyethylene glycol terephthalate (PET) MPs decreased to zero after six months of natural incubation in rivers. According to various characterizations, the hydrophilization mechanism is mainly correlated with surface oxidation and the deposition of clay minerals. Inspired by surface wettability conversion, we applied surfactants (collectors) to enhance MPs hydrophobicity and flotation efficiency. Anionic sodium oleate (NaOL) and cationic dodecyl trimethyl ammonium chloride (DTAC) were used to regulate surface hydrophobicity. The effects of collector concentration, pH, conditioning time, and metal ions on MPs flotation were thoroughly elucidated. Characterizations and adsorption experiments were performed to describe the heterogeneous adsorption of surfactants on MPs surfaces. The interaction between surfactants and MPs was explained through density functional theory (DFT) simulations. The dispersion energy between hydrophobic hydrocarbon chains attracts collectors on the MPs surface, and the collector molecules wrap and laminate to MPs surfaces. Flotation using NaOL exhibited a higher removal efficiency, and NaOL was environmentally friendly. Subsequently, we investigated the activation of Ca2+, Fe3+, and Al3+ to further improve the collecting efficiency of NaOL. Under the optimized conditions, MPs in natural rivers could be removed by froth flotation. This study shows the great promise of froth flotation for the application of MPs removal.
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Affiliation(s)
- Hongru Jiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Jiaqi Bu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Kai Bian
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Jiming Su
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Zhiyi Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Han Sun
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China
| | - Hui Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan, PR China.
| | - Yingshuang Zhang
- School of Chemical Engineering and Technology, Xinjiang University, 830017 Urumqi, Xinjiang, PR China.
| | - Chongqing Wang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, PR China
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Synergistic mechanism of mixed cationic/anionic collectors on lepidolite flotation from the perspective of improving the performance of flotation foam. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2022.130354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Huang Z, Li W, He G, Shen L, Chen X, Shuai S, Li F, Wang H, Liu R, Zhang S, Cheng C, Ouyang L, Yu X, Fu W. Adsorption Mechanism of Amidoxime Collector on the Flotation of Lepidolite: Experiment and DFT Calculation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15858-15865. [PMID: 36473165 DOI: 10.1021/acs.langmuir.2c02821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Lepidolite is an important mineral resource of lithium. With the increase in awareness of low-carbon and green travel, the demand for lithium has increased dramatically. Therefore, how to increase the output of lithium has to turn into high precedence. In this paper, amidoxime (DPA) was synthesized and used for the efficient collection of lepidolite. Dodecylamine (DA), a commonly used collector of lepidolite ore, was used for comparison. The collecting performances of DA and DPA for lepidolite were studied by the micro-flotation experiment, and the adsorption mechanism of DPA on lepidolite was verified by contact angle, zeta potential tests, FTIR spectra, and density functional theory (DFT) calculations. The results of flotation experiments showed that at the same collector dosage (3 × 10-4 mol/L), the recovery of lepidolite could reach 90%, while the recovery of lepidolite with DA was only 52.5%, and to achieve the maximum recovery of DA (77.5%), only half of the DPA was added. The contact angle test results showed that DPA could effectively improve the hydrophobicity of lepidolite than DA. FTIR spectra and zeta potential tests suggested that DPA molecules were adsorbed on the lepidolite surface by electrostatic attraction. DFT calculations revealed that DPA reacted with the nucleophilic reagent (lepidolite) by the reactive site of the -CH2NH(CH2)2C(NOH)N+H3 group and more easily absorbed on the surface of lepidolite than DA. Therefore, our new finding will provide an important prospect for the sustainable development and utilization of lithium resources.
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Affiliation(s)
- Zhiqiang Huang
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Wenyuan Li
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Guichun He
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Louyan Shen
- China Nerin Engineering Co. Ltd, Nanchang, Jiangxi 330031, China
| | - Xiaoai Chen
- China Nerin Engineering Co. Ltd, Nanchang, Jiangxi 330031, China
| | - Shuyi Shuai
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Fangxu Li
- Guangdong Institute of Resources Comprehensive Utilization, Guangzhou 510650, China
| | - Hongling Wang
- Guangdong Institute of Resources Comprehensive Utilization, Guangzhou 510650, China
| | - Rukuan Liu
- Hunan Academy of Forestry, Changsha, Hunan 410004, China
| | - Shiyong Zhang
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Chen Cheng
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Liaoyuan Ouyang
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Xinyang Yu
- Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China
| | - Weng Fu
- School of Chemical Engineering, The University of Queensland, St Lucia, Queensland 4072, Australia
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Xu R, Liu J, Sun W, Wang L. Insights into the synergistic adsorption mechanism of mixed SDS/DDA collectors on biotite using quartz crystal microbalance with dissipation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.123049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Wang LP, Chen YJ, Chen XY, Huang KJ. Separation of silicon carbide and silicon powders in kerf loss slurry of loose abrasive sawing by means of phase transfer separation method with mixed cationic-anionic surfactant collectors addition. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Han H, Yin W, Wang D, Zhu Z, Yang B, Yao J. New insights into the dispersion mechanism of citric acid for enhancing the flotation separation of fine siderite from hematite and quartz. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128459] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Wang L, Wang G, Ge P, Sun W, Tang H, Hu W. Activation mechanisms of quartz flotation with calcium ions and cationic/anionic mixed collectors under alkalescent conditions. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127771] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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