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Lü T, Zhou S, Ma R, Qi D, Sun Y, Zhang D, Huang J, Zhao H. Demulsification Performance and Mechanism of Tertiary Amine Polymer-Grafted Magnetic Nanoparticles in Surfactant-Free Oil-in-Water Emulsion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:1288-1298. [PMID: 36621519 DOI: 10.1021/acs.langmuir.2c03090] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Numerous cationic magnetic nanoparticles (MNPs) have previously been developed for demulsifying oil-in-water (O/W) emulsion, and results showed that the cationic MNPs could effectively flocculate and remove the negatively charged oil droplets via charge attraction; however, to the best of our knowledge, there are no research reports regarding the synergetic influence of both the positive charge density and interfacial activity of MNPs on the demulsification performance. In this study, three tertiary amine polymer-grafted MNPs, namely, poly(2-dimethylaminoethyl acrylate)-grafted MNPs (M-PDMAEA), poly(2-dimethylamino)ethyl methacrylate)-grafted MNPs (M-PDMAEMA), and poly(2-diethylaminoethyl methacrylate)-grafted MNPs (M-PDEAEMA), were synthesized and evaluated for their demulsification performance. Results demonstrated that a high positive charge density and superior interfacial activity of MNPs could cause partial oil droplet re-dispersion when excessive MNPs were introduced, leading to a lower magnetic separation efficiency and narrower demulsification window. Herein, a demulsification window is defined as a range of nanoparticle dosages in which the MNPs can effectively demulsify the O/W emulsion under certain conditions. For highly positively charged MNPs, their good interfacial activity could aggravate the formation of a narrower demulsification window. When tertiary amine polymer-grafted MNPs carried a lower positive charge density or weak interfacial activity, that is, M-PDMAEA at pH 4.0, M-PDMAEMA at pH 5.0-9.0, and M-PDEAEMA at pH 9.0-10.0, wide demulsification windows were observed. Additionally, a recycling experiment suggested that MNPs could maintain high demulsification efficiency up to at least five cycles, indicating their satisfactory recyclability. The three tertiary amine polymer-grafted MNPs can be potentially used for efficient demulsification from surfactant-free O/W emulsion in various pH ranges.
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Affiliation(s)
- Ting Lü
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China
| | - Shuangshuang Zhou
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China
| | - Ronggang Ma
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China
| | - Dongming Qi
- Key Laboratory of Green Cleaning Technology & Detergent of Zhejiang Province, Lishui 323000, Zhejiang, China
| | - Yangyi Sun
- Key Laboratory of Green Cleaning Technology & Detergent of Zhejiang Province, Lishui 323000, Zhejiang, China
| | - Dong Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China
| | - Jingang Huang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China
| | - Hongting Zhao
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528011, Guangdong, China
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Hybrid silica material as a mixed-mode sorbent for solid-phase extraction of hydrophobic and hydrophilic illegal additives from food samples. J Chromatogr A 2022; 1672:463049. [DOI: 10.1016/j.chroma.2022.463049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 04/08/2022] [Accepted: 04/08/2022] [Indexed: 11/17/2022]
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A review of the design of packing materials for ion chromatography. J Chromatogr A 2021; 1653:462313. [PMID: 34332319 DOI: 10.1016/j.chroma.2021.462313] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 05/30/2021] [Indexed: 12/15/2022]
Abstract
The development of ion chromatography has made remarkable progress in the past few decades, and it is now widely used for the analysis of common ions and organic compounds. Ion chromatography has many advantages, such as fast, high sensitivity, good selectivity and support for simultaneous analysis of multiple ionic compounds. In order to meet the high requirements of material analysis, new packing materials for ion chromatography with higher sensitivity and selectivity have been developed. In this paper, a lot of knowledge of ion chromatography is reviewed, and the development of ion chromatographic packings in recent years, especially in the last five years, is summarized.
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