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Liu IC, Hu X, Fei B, Lee C, Fan S, Xin JH, Noor N. Fluorine-free nanoparticle coatings on cotton fabric: comparing the UV-protective and hydrophobic capabilities of silica vs. silica-ZnO nanostructures. RSC Adv 2024; 14:4301-4314. [PMID: 38304558 PMCID: PMC10828638 DOI: 10.1039/d3ra08835a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Accepted: 01/22/2024] [Indexed: 02/03/2024] Open
Abstract
Robust, hydrophobic woven cotton fabrics were obtained through the sol-gel dip coating of two different nanoparticle (NP) architectures; silica and silica-ZnO. Water repellency values as high as 148° and relatively low tilt angles for fibrous fabrics (12°) were observed, without the need for fluorinated components. In all cases, this enhanced functionality was achieved with the broad retention of water vapor permeability characteristics, i.e., less than 10% decrease. NP formation routes indicated direct bonding interactions in both the silica and silica-ZnO structures. The physico-chemical effects of NP-compatibilizer (i.e., polydimethoxysilane (PDMS) and n-octyltriethoxysilane (OTES) at different ratios) coatings on cotton fibres indicate that compatibilizer-NP interactions are predominantly physical. Whenever photoactive ZnO-containing additives were used, there was a minor decrease in hydrophobic character, but order of magnitude increases in UV-protective capability (i.e., UPF > 384); properties which were absent in non-ZnO-containing samples. Such water repellency and UPF capabilities were stable to both laundering and UV-exposure, resisting the commonly encountered UV-induced wettability transitions associated with photoactive ZnO. These results suggest that ZnO-containing silica NP coatings on cotton can confer both excellent and persistent surface hydrophobicity as well as UV-protective capability, with potential uses in wearables and functional textiles applications.
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Affiliation(s)
- Irene ChaoYun Liu
- The Hong Kong Polytechnic University, School of Fashion and Textiles, Materials Synthesis and Processing Lab Hung Hom Kowloon Hong Kong SAR
| | - Xin Hu
- The Hong Kong Polytechnic University, School of Fashion and Textiles, Materials Synthesis and Processing Lab Hung Hom Kowloon Hong Kong SAR
| | - Bin Fei
- The Hong Kong Polytechnic University, School of Fashion and Textiles, Materials Synthesis and Processing Lab Hung Hom Kowloon Hong Kong SAR
| | - Chenghao Lee
- The Hong Kong Polytechnic University, School of Fashion and Textiles, Materials Synthesis and Processing Lab Hung Hom Kowloon Hong Kong SAR
| | - Suju Fan
- The Hong Kong Polytechnic University, School of Fashion and Textiles, Materials Synthesis and Processing Lab Hung Hom Kowloon Hong Kong SAR
| | - John H Xin
- The Hong Kong Polytechnic University, School of Fashion and Textiles, Materials Synthesis and Processing Lab Hung Hom Kowloon Hong Kong SAR
| | - Nuruzzaman Noor
- The Hong Kong Polytechnic University, School of Fashion and Textiles, Materials Synthesis and Processing Lab Hung Hom Kowloon Hong Kong SAR
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Zhao M, Shang Y, Xiong Y, Zhang X. Reusable, Stable, Efficient and Multifunctional Superhydrophobic and Oleophilic Polyurethane Sponge for Oil-Water Separation Prepared Using Discarded Composite Insulator. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6320. [PMID: 37763597 PMCID: PMC10532702 DOI: 10.3390/ma16186320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 09/17/2023] [Accepted: 09/19/2023] [Indexed: 09/29/2023]
Abstract
Oil spills and chemical leakages are a serious source of pollution in oceans and rivers, and have attracted worldwide attention. Many scientists are currently engaged in the development of oil-water separation technology. In this study, the umbrella skirt of a discarded silicone rubber insulator was utilized as feedstock, and polydimethylsiloxane (PDMS) was employed to immobilize the prepared powder (FXBW) onto a polyurethane (PU) sponge skeleton. Without any modifications using chemical reagents, a novel oil-water separation material, FXBW-PU, was developed, with a water contact angle of 155.3°. The FXBW-PU sponge exhibited an absorption capacity ranging from 11.79 to 26.59 g/g for various oils and organic solvents, while maintaining an excellent selective adsorption performance, even after undergoing ten compression cycles, due to its exceptional chemical and mechanical stability. With the assistance of a vacuum pump, the FXBW-PU sponge was utilized in a continuous separation apparatus, resulting in a separation efficiency exceeding 98.6% for various oils and organic solvents. The separation efficiency of n-hexane remains as high as 99.2% even after 10 consecutive separation cycles. Notably, the FXBW-PU sponge also separated the dichloromethane-in-water emulsions, which achieved the effect of purifying water. In summary, FXBW-PU sponge has great potential in the field of cleaning up oil/organic solvent contamination due to its low preparation cost, environmental friendliness and excellent performance.
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Affiliation(s)
- Meiyun Zhao
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
- College of Mechanical & Power Engineering, China Three Gorges University, Yichang 443000, China
| | - Yuanyuan Shang
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
| | - Yufan Xiong
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
| | - Xiaolong Zhang
- Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenace, China Three Gorges University, Yichang 443000, China; (M.Z.)
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Selim MS, Fatthallah NA, Shenashen MA, Higazy SA, Madian HR, Selim MM, El-Safty SA. Bioinspired Graphene Oxide-Magnetite Nanocomposite Coatings as Protective Superhydrophobic Antifouling Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2333-2346. [PMID: 36719844 DOI: 10.1021/acs.langmuir.2c03061] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Antifouling (AF) nanocoatings made of polydimethylsiloxane (PDMS) are more cost-efficient and eco-friendly substitutes for the already outlawed tributyltin-based coatings. Here, a catalytic hydrosilation approach was used to construct a design inspired by composite mosquito eyes from non-toxic PDMS nanocomposites filled with graphene oxide (GO) nanosheets decorated with magnetite nanospheres (GO-Fe3O4 nanospheres). Various GO-Fe3O4 hybrid nanofillers were dispersed into the PDMS resin through a solution casting method to evaluate the structure-property relationship. A simple coprecipitation procedure was used to fabricate magnetite nanospheres with an average diameter of 30-50 nm, a single crystal structure, and a predominant (311) lattice plane. The uniform bioinspired superhydrophobic PDMS/GO-Fe3O4 nanocomposite surface produced had a micro-/nano-roughness, low surface-free energy (SFE), and high fouling release (FR) efficiency. It exhibited several advantages including simplicity, ease of large-area fabrication, and a simultaneous offering of dual micro-/nano-scale structures simply via a one-step solution casting process for a wide variety of materials. The superhydrophobicity, SFE, and rough topology have been studied as surface properties of the unfilled silicone and the bioinspired PDMS/GO-Fe3O4 nanocomposites. The coatings' physical, mechanical, and anticorrosive features were also taken into account. Several microorganisms were employed to examine the fouling resistance of the coated specimens for 1 month. Good dispersion of GO-Fe3O4 hybrid fillers in the PDMS coating until 1 wt % achieved the highest water contact angle (158° ± 2°), the lowest SFE (12.06 mN/m), micro-/nano-roughness, and improved bulk mechanical and anticorrosion properties. The well-distributed PDMS/GO-Fe3O4 (1 wt % nanofillers) bioinspired nanocoating showed the least biodegradability against all the tested microorganisms [Kocuria rhizophila (2.047%), Pseudomonas aeruginosa (1.961%), and Candida albicans (1.924%)]. We successfully developed non-toxic, low-cost, and economical nanostructured superhydrophobic FR composite coatings for long-term ship hull coatings. This study may expand the applications of bio-inspired functional materials because for multiple AF, durability and hydrophobicity are both important features in several industrial applications.
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Affiliation(s)
- Mohamed S Selim
- Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Nesreen A Fatthallah
- Processes Design & Development Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Mohamed A Shenashen
- Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken305-0047, Japan
| | - Shimaa A Higazy
- Petroleum Application Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Hekmat R Madian
- Processes Design & Development Department, Egyptian Petroleum Research Institute (EPRI), Nasr City11727, Cairo, Egypt
| | - Mahmoud M Selim
- Prince Sattam Bin Abdulaziz University, P.O. Box 173, Al-Kharj11942, Saudi Arabia
| | - Sherif A El-Safty
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukubashi, Ibaraki-ken305-0047, Japan
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Chen X, Li Y, Yang Y, Zhang D, Guan Y, Bao M, Wang Z. A super-hydrophobic and antibiofouling membrane constructed from carbon sphere-welded MnO2 nanowires for ultra-fast separation of emulsion. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120514] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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5
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Guevara-Lora I, Wronski N, Bialas A, Osip H, Czosnek C. Efficient Adsorption of Chromium Ions from Aqueous Solutions by Plant-Derived Silica. Molecules 2022; 27:molecules27134171. [PMID: 35807417 PMCID: PMC9268362 DOI: 10.3390/molecules27134171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/26/2022] [Accepted: 06/27/2022] [Indexed: 02/04/2023] Open
Abstract
Nowadays, there is great interest in the use of plant waste to obtain materials for environmental protection. In this study, silica powders were prepared with a simple and low-cost procedure from biomass materials such as horsetail and common reed, as well as wheat and rye straws. The starting biomass materials were leached in a boiling HCl solution. After washing and drying, the samples were incinerated at 700 °C for 1 h in air. The organic components of the samples were burned leaving final white powders. These powders were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, dynamic light scattering (DLS), scanning electron microscopy (SEM), and low-temperature nitrogen sorption. The amorphous powders (biosilica) contained mainly SiO2, as indicated by FTIR analysis. Horsetail-derived silica was chosen for testing the removal of dichromate ions from water solutions. This biosilica had a good ability to adsorb Cr(VI) ions, which increased after modification of the powder with the dodecylamine surfactant. It can be concluded that the applied procedure allowed obtaining high purity biosilica from plant waste with good efficiency. The produced biosilica was helpful in removing chromium ions and showed low cytotoxicity to human endothelial cells, suggesting that it can be safely used in environmental remediation.
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Affiliation(s)
- Ibeth Guevara-Lora
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, Gronostajowa 7, 30-387 Krakow, Poland; (I.G.-L.); (N.W.)
| | - Norbert Wronski
- Department of Analytical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University in Krakow, Gronostajowa 7, 30-387 Krakow, Poland; (I.G.-L.); (N.W.)
| | - Anna Bialas
- Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland; (A.B.); (H.O.)
| | - Honorata Osip
- Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland; (A.B.); (H.O.)
| | - Cezary Czosnek
- Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland; (A.B.); (H.O.)
- Correspondence:
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6
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Oh HS, Lee CH, Kim NK, An T, Kim GH. Review: Sensors for Biosignal/Health Monitoring in Electronic Skin. Polymers (Basel) 2021; 13:2478. [PMID: 34372081 PMCID: PMC8347500 DOI: 10.3390/polym13152478] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 07/20/2021] [Accepted: 07/21/2021] [Indexed: 11/16/2022] Open
Abstract
Skin is the largest sensory organ and receives information from external stimuli. Human body signals have been monitored using wearable devices, which are gradually being replaced by electronic skin (E-skin). We assessed the basic technologies from two points of view: sensing mechanism and material. Firstly, E-skins were fabricated using a tactile sensor. Secondly, E-skin sensors were composed of an active component performing actual functions and a flexible component that served as a substrate. Based on the above fabrication processes, the technologies that need more development were introduced. All of these techniques, which achieve high performance in different ways, are covered briefly in this paper. We expect that patients' quality of life can be improved by the application of E-skin devices, which represent an applied advanced technology for real-time bio- and health signal monitoring. The advanced E-skins are convenient and suitable to be applied in the fields of medicine, military and environmental monitoring.
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Affiliation(s)
- Hyeon Seok Oh
- School of Mechanical Engineering, Chungbuk National University (CBNU), 1, Chungdae-ro, Seowon-gu, Cheongju-si 28644, Chungcheongbuk-do, Korea; (H.S.O.); (C.H.L.); (N.K.K.)
| | - Chung Hyeon Lee
- School of Mechanical Engineering, Chungbuk National University (CBNU), 1, Chungdae-ro, Seowon-gu, Cheongju-si 28644, Chungcheongbuk-do, Korea; (H.S.O.); (C.H.L.); (N.K.K.)
| | - Na Kyoung Kim
- School of Mechanical Engineering, Chungbuk National University (CBNU), 1, Chungdae-ro, Seowon-gu, Cheongju-si 28644, Chungcheongbuk-do, Korea; (H.S.O.); (C.H.L.); (N.K.K.)
| | - Taechang An
- Department of Mechanical & Robotics Engineering, Andong National University (ANU), 1375, Gyeong-dong-ro, Andong-si 36729, Gyeongsangbuk-do, Korea;
| | - Geon Hwee Kim
- School of Mechanical Engineering, Chungbuk National University (CBNU), 1, Chungdae-ro, Seowon-gu, Cheongju-si 28644, Chungcheongbuk-do, Korea; (H.S.O.); (C.H.L.); (N.K.K.)
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7
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Pristine and Poly(Dimethylsiloxane) Modified Multi-Walled Carbon Nanotubes as Supports for Lipase Immobilization. MATERIALS 2021; 14:ma14112874. [PMID: 34072043 PMCID: PMC8198216 DOI: 10.3390/ma14112874] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 05/23/2021] [Accepted: 05/25/2021] [Indexed: 01/24/2023]
Abstract
The presented study deals with the fabrication of highly stable and active nanobiocatalysts based on Candida antarctica lipase B (CALB) immobilization onto pristine and poly(dimethylsiloxane) modified MWCNTs. The MWCNTs/PDMS nanocomposites, containing 40 wt.% of the polymer with two molecular weights, were successfully synthesized via adsorption modification. The effect of PDMS chains length on the textural/structural properties of produced materials was studied by means of the nitrogen adsorption–desorption technique, Raman spectroscopy, and attenuated total reflectance Fourier transform infrared spectroscopy. P-MWCNTs and MWCNTs/PDMS nanocomposites were tested as supports for lipase immobilization. Successful deposition of the enzyme onto the surface of P-MWCNTs and MWCNTs/PDMS nanocomposite materials was confirmed mainly using ATR-FTIR spectroscopy. The immobilization efficiency, stability, and catalytic activity of the immobilized enzyme were studied, and the reusability of the produced biocatalytic systems was examined. The presented results demonstrate that the produced novel biocatalysts might be considered as promising materials for biocatalytic applications.
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8
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Gun'ko VM. Polymer Adsorbents vs. Functionalized Oxides and Carbons: Particulate Morphology and Textural and SurfaceCharacteristics. Polymers (Basel) 2021; 13:1249. [PMID: 33921494 PMCID: PMC8069040 DOI: 10.3390/polym13081249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/08/2021] [Accepted: 04/09/2021] [Indexed: 01/15/2023] Open
Abstract
Various methods for morphological, textural, and structural characterization of polymeric, carbon, and oxide adsorbents have been developed and well described. However, there are ways to improve the quantitative information extraction from experimental data for describing complex sorbents and polymer fillers. This could be based not only on probe adsorption and electron microscopies (TEM, SEM) but also on small-angle X-ray scattering (SAXS), cryoporometry, relaxometry, thermoporometry, quasi-elastic light scattering, Raman and infrared spectroscopies, and other methods. To effectively extract information on complex materials, it is important to use appropriate methods to treat the data with adequate physicomathematical models that accurately describe the dependences of these data on pressure, concentration, temperature, and other parameters, and effective computational programs. It is shown that maximum accurate characterization of complex materials is possible if several complemented methods are used in parallel, e.g., adsorption and SAXS with self-consistent regularization procedures (giving pore size (PSD), pore wall thickness (PWTD) or chord length (CLD), and particle size (PaSD) distribution functions, the specific surface area of open and closed pores, etc.), TEM/SEM images with quantitative treatments (giving the PaSD, PSD, and PWTD functions), as well as cryo- and thermoporometry, relaxometry, X-ray diffraction, infrared and Raman spectroscopies (giving information on the behavior of the materials under different conditions).
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Affiliation(s)
- Volodymyr M Gun'ko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine
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9
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Protsak I, Gun’ko VM, Henderson IM, Pakhlov EM, Sternik D, Le Z. Nanostructured Amorphous Silicas Hydrophobized by Various Pathways. ACS OMEGA 2019; 4:13863-13871. [PMID: 31497703 PMCID: PMC6714511 DOI: 10.1021/acsomega.9b01508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 07/31/2019] [Indexed: 06/10/2023]
Abstract
Various nanostructured amorphous silicas [fumed silicas such as crude (A-300), hydro-compacted (cA-300, TS 100), and precipitated silica Syloid 244] were modified by different polydimethylsiloxanes such as PDMS5, PDMS100, PDMS200, PDMS1000, and PDMS12500 (the label numbers show the viscosity (η) values) using dimethyl carbonate (DMC) as a siloxane-bond-breaking reagent. In addition, hexamethyldisilazane was used to modify fumed silica cA-300. The nanocomposites were characterized using microscopy, infrared spectroscopy, thermodesorption, nitrogen adsorption-desorption, solid-state NMR spectroscopy, small-angle X-ray scattering, and zeta-potential methods. It was found that the morphological, textural, and structural characteristics of silicas grafted with PDMS depend strongly not only on the type and content of the polymers used but also on the organization of nonporous nanoparticles (NPNP) in secondary structures (aggregates of NPNP and agglomerated aggregates, ANPNP), as well on the reaction temperature (T r). Specifically, we determined that ANPNP with a macro/mesoporous character are favorable for the effective modification of the silicas studied with short polymers and no DMC addition but at higher temperatures or for a longer silicone polymer with the presence of DMC and at lower temperatures. In particular, the PDMS/DMC-modified silicas are of great interest from a practical point of view because they remain in a dispersed state with no strong compaction of the secondary structures after modification, and this corresponds to a better distribution of the modified nanoparticles in polymeric or other matrices.
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Affiliation(s)
- Iryna
S. Protsak
- College
of Environment, Zhejiang University of Technology, Hangzhou 310014, China
- College
of Science, Zhejiang University of Technology, Hangzhou 310023, China
| | - Volodymyr M. Gun’ko
- Chuiko
Institute of Surface Chemistry of NAS of Ukraine, Kiev 03164, Ukraine
| | - Ian M. Henderson
- Omphalos
Bioscience, LLC, Albuquerque 87110, New Mexico, United States
| | - Evgeniy M. Pakhlov
- Chuiko
Institute of Surface Chemistry of NAS of Ukraine, Kiev 03164, Ukraine
| | | | - Zichun Le
- College
of Science, Zhejiang University of Technology, Hangzhou 310023, China
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Anoop V, Subramani S, Jaisankar SN, Sohini C, Mary NL. Mechanical, dielectric, and thermal properties of polydimethylsiloxane/polysilsesquioxane nanocomposite for sealant application. J Appl Polym Sci 2018. [DOI: 10.1002/app.47228] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- V. Anoop
- Department of Chemistry; Stella Maris College; Chennai, 600086 Tamil Nadu India
| | - S. Subramani
- Anabond Limited; Chennai, 600096 Tamil Nadu India
| | - S. N. Jaisankar
- Polymer Science and Technology Division; Central Leather Research Institute; Chennai, 600020 Tamil Nadu India
| | - C. Sohini
- Department of Chemistry; Stella Maris College; Chennai, 600086 Tamil Nadu India
| | - N. L. Mary
- Department of Chemistry; Stella Maris College; Chennai, 600086 Tamil Nadu India
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Klonos P, Bolbukh Y, Koutsiara C, Zafeiris K, Kalogeri O, Sternik D, Deryło–Marczewska A, Tertykh V, Pissis P. Morphology and molecular dynamics investigation of low molecular weight PDMS adsorbed onto Stöber, fumed, and sol-gel silica nanoparticles. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Gun'ko VM, Pakhlov EM, Goncharuk OV, Andriyko LS, Nychiporuk YM, Balakin DY, Sternik D, Derylo-Marczewska A. Nanosilica modified by polydimethylsiloxane depolymerized and chemically bound to nanoparticles or physically bound to unmodified or modified surfaces: Structure and interfacial phenomena. J Colloid Interface Sci 2018; 529:273-282. [PMID: 29908403 DOI: 10.1016/j.jcis.2018.06.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 11/16/2022]
Abstract
Three polydimethylsiloxanes (PDMS200, PDMS1000, and PDMS12500 with numbers showing the viscosity values dependent on the molecular weight) were used for adsorption (14-95 wt% PDMS) onto unmodified and PDMS-modified (16.7 wt% PDMS using dimethyl carbonate (DMC) as a siloxane bond breaking reagent) nanosilica A-300. The materials were studied using microscopy, infrared spectroscopy, thermodesorption, calorimetry, ethanol and water/ethanol evaporation, nitrogen adsorption-desorption, and quantum chemical methods. The interfacial and temperature behaviors of a PDMS layer at a silica surface depend strongly on the type of bonding to silica particles, molecular weight and content of PDMS. Upon chemical bonding, shorter PDMS200 forms a denser coverage of the silica surface since SBET diminution is larger and residual free silanols are practically absent (the degree of free silanol substitution Θ > 0.95) in contrast to the reactions with PDMS1000/DMC or PDMS12500/DMC providing Θ = 0.60-0.63 at larger SBET values. Upon thermal decomposition of the PDMS layer, oxidation/depolymerization desorption gives a greater contribution than pure depolymerization destruction. An increase in the PDMS adsorption layer thickness leads to enhancement of the depolymerization contribution because the oxidation mainly occurs at the top of the layer, but the depolymerization can occur in the total PDMS layer. The adsorption, desorption, and evaporation processes of low-molecular weight probes at a surface of PDMS-modified nanosilica depend strongly on the type of bonding and content of PDMS. Thus, the most effective hydrophobization of nanosilica by PDMS/DMC could be carried out using the shortest polymer giving the shortest PDMS fragments upon the interaction with DMC that is of interest from a practical point of view.
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Affiliation(s)
- V M Gun'ko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine.
| | - E M Pakhlov
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - O V Goncharuk
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - L S Andriyko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - Yu M Nychiporuk
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - D Yu Balakin
- Institute of Physics, 46 Prospect Nauki, 03028 Kyiv, Ukraine
| | - D Sternik
- Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
| | - A Derylo-Marczewska
- Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
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Wiśniewska M, Chibowski S, Urban T, Nosal-Wiercińska A, Terpiłowski K, Goncharuk O. Comparison of adsorption affinity of anionic polyacrylamide for nanostructured silica-titania mixed oxides. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.02.117] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Budnyak TM, Gładysz-Płaska A, Strizhak AV, Sternik D, Komarov IV, Majdan M, Tertykh VA. Imidazole-2yl-Phosphonic Acid Derivative Grafted onto Mesoporous Silica Surface as a Novel Highly Effective Sorbent for Uranium(VI) Ion Extraction. ACS APPLIED MATERIALS & INTERFACES 2018; 10:6681-6693. [PMID: 29370513 DOI: 10.1021/acsami.7b17594] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A new imidazol-2yl-phosphonic acid/mesoporous silica sorbent (ImP(O)(OH)2/SiO2) was developed and applied for uranium(VI) ion removal from aqueous solutions. The synthesized material was characterized by fast kinetics and an extra-high adsorption capacity with respect to uranium. The highest adsorption efficiency of U(VI) ions was obtained for the reaction system at pH 4 and exceeded 618 mg/g. The uranium(VI) sorption proceeds quickly in the first step within 60 min of the adsorbent sites and ion interactions. Moreover, the equilibrium time was determined to be 120 min. The equilibrium and kinetic characteristics of the uranium(VI) ions uptake by synthesized sorbent was found to follow the Langmuir-Freundlich isotherm model and pseudo-second-order kinetics rather than the Langmuir, Dubinin-Radushkevich, and Temkin models and pseudo-first-order or intraparticle diffusion sorption kinetics. The adsorption mechanism for uranium on the sorbent was clarified basing on the X-ray photoelectron spectroscopy (XPS) analysis. The model of UO22+ binding to surface of the sorbent was proposed according to the results of XPS, i.e., a 1:1 U-to-P ratio in the sorbed complex was established. The regeneration study confirms the ImP(O)(OH)2/SiO2 sorbent can be reused. A total of 45% of uranium ions was determined as originating from the sorbent leaching in the acidic solutions, whereas when the basic solutions were used, the removal efficiency was 12%.
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Affiliation(s)
- Tetyana M Budnyak
- Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine , 17 General Naumov Street, 03164 Kyiv, Ukraine
- KTH Royal Institute of Technology , Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | | | - Alexander V Strizhak
- Taras Shevchenko National University of Kyiv , 64/13 Volodymyrska Street, 01601 Kyiv, Ukraine
| | - Dariusz Sternik
- Maria Curie Skłodowska University , 2 Marie Curie Skłodowska Square, 20-031 Lublin, Poland
| | - Igor V Komarov
- Taras Shevchenko National University of Kyiv , 64/13 Volodymyrska Street, 01601 Kyiv, Ukraine
| | - Marek Majdan
- Maria Curie Skłodowska University , 2 Marie Curie Skłodowska Square, 20-031 Lublin, Poland
| | - Valentin A Tertykh
- Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine , 17 General Naumov Street, 03164 Kyiv, Ukraine
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