Fabrication of TiO2-modified polytetrafluoroethylene ultrafiltration membranes via plasma-enhanced surface graft pretreatment

Qian, Yingjia; Na, Li; Zhou, Weili; Yu, Zhen; Zhang, Zhongzhi; Zhang, Zhenjia; Jiang, Zheng

doi:10.1016/j.apsusc.2015.11.059

Cited by 68 publications

(25 citation statements)

References 29 publications

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“…1c that graft of PAA grafting layer not only reduced the roughness of the interknitting fibers but also narrowed some large pores among fibers, resulting in the change of membrane morphology from network to nodular structure. It could be speculated that the acrylic acid monomer adsorbed on the inner surface of plasma-treated PTFE membranes underwent grafting polymerization to form PAA coated onto PTFE which, in turn, brought to hydrophilicity of the PAA/ PTFE membrane [22]. Such PAA coating provides sufficient bonding sites to fix TiO 2 via coordination, because the abundant hydroxyl groups of PAA layer offer active coordinate sites to fix TiO 2 at higher dispersion.…”

Section: Resultsmentioning

confidence: 99%

“…In the previous study [22], the successful loading of TiO 2 on the modified PTFE UF membrane was evidenced by XPS. In the current work, the evolution of C species and O species is further demonstrated by the high-resolution C1 s and O1 s XPS spectra for all the samples and their corresponding deconvolution in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The modification methodology was developed in our previous study [22], including the successive three-step process: plasma pretreatment of PTFE, graft polymerization of AA onto plasma-treated PTFE to form PAA/PTFE, and TiO 2 self-assembly onto the PAA/PTFE to obtain the composite membranes. The mass-gaining rate of the PTFE membrane after introducing AA and TiO 2 to the surface was calculated using the following Eq.…”

Section: Membrane Modification Proceduresmentioning

confidence: 99%

“…Recently, we developed a plasma-intensified coating process to fabricate TiO 2 /PAA/PTFE composite membrane [22], and the composite membrane exhibited excellent initial hydrophilicity, high ultrafiltration performance, antifouling ability as well as photocatalytic self-cleaning capability, which closely related to the property of TiO 2 layer. However, the practical application of such membrane must fulfill the strict durability requirements to the engineering and mechanical properties of the TiO 2 coating, which highly depends on its surface roughness and composition.…”

Section: Introductionmentioning

confidence: 99%

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Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

et al. 2016

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Immobilization of nano-scaled TiO 2 onto polymeric ultrafiltration (UF) membrane offers desirable antifouling and self-cleaning properties to the membrane, which is practical in wastewater purification only if the mechanical strength and long-term self-cleaning durability are realized. This paper reported the surface roughness, mechanical properties, thermal stability, and recycling selfcleaning performance of the novel TiO 2 /PAA/PTFE UF membranes, which were coated via an innovative plasmaintensified coating strategy. Through careful characterizations, the enhanced engineering properties and the selfcleaning performance were correlated with the surface chemical composition and the creative coating technique. In the recycling photocatalytic self-cleaning tests in photodegradation of methylene blue (MB) solution, about 90 % MB photocatalytic capability of TiO 2 /PAA/PTFE composite membranes could be recovered with simple hydraulic cleaning combined with UV irradiation. The mechanical properties and thermal stability of TiO 2 /PAA/ PTFE also satisfy the practical application in water and wastewater treatments, despite that the original engineering properties were slightly influenced by PAA grafting and TiO 2 coating. The changed properties of the composite UF membrane relative to PTFE are reasonably attributed to the variation of the surface chemical species and chemical bonding, as well as the thickness and evenness of the surface functional layers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Membrane Modification Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

et al. 2016

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“…The TiO 2 nanoparticles coordinate via Ti 4+ and an electronegative group like oxygen atoms or the hydrogen bond between the surface hydroxyl group of TiO 2 and oxygen groups of the polymer [47]. TiO 2 can undergo different kind of bonding (e.g., monodentate, bridging bidentate, and chelating bidentate) [48] with the carboxyl groups on the membrane. In addition, the TiO 2 nanoparticle suspension was additionally treated with ultrasound (further on referenced to as 210 • C + US).…”

Section: Tio2 Nanoparticle Distribution On the Polymer Membranementioning

confidence: 99%

Synthesis of High Crystalline TiO2 Nanoparticles on a Polymer Membrane to Degrade Pollutants from Water

et al. 2018

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Titanium dioxide (TiO 2 ) is described as an established material to remove pollutants from water. However, TiO 2 is still not applied on a large scale due to issues concerning, for example, the form of use or low photocatalytic activity. We present an easily upscalable method to synthesize high active TiO 2 nanoparticles on a polyethersulfone microfiltration membrane to remove pollutants in a continuous way. For this purpose, titanium(IV) isopropoxide was mixed with water and hydrochloric acid and treated up to 210 • C. After cooling, the membrane was simply dip-coated into the TiO 2 nanoparticle dispersion. Standard characterization was undertaken (i.e., X-ray powder diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, water permeance, contact angle). Degradation of carbamazepine and methylene blue was executed. By increasing synthesis temperature crystallinity and photocatalytic activity elevates. Both ultrasound modification of nanoparticles and membrane pre-modification with carboxyl groups led to fine distribution of nanoparticles. The ultrasound-treated nanoparticles gave the highest photocatalytic activity in degrading carbamazepine and showed no decrease in degradation after nine times of repetition. The TiO 2 nanoparticles were strongly bound to the membrane. Photocatalytic TiO 2 nanoparticles with high activity were synthesized. The innovative method enables a fast and easy nanoparticle production, which could enable the use in large-scale water cleaning.Catalysts 2018, 8, 376 2 of 16 efficiently from water. The main challenge is to generate a low cost, long-term stable, and reusable system with a high activity to degrade organic contaminants.The mode of application of TiO 2 is a crucial parameter as it already defines the degradation rate and success. Theoretically, the photocatalytic activity is the highest when using TiO 2 as nanoparticles in a suspension as the overall surface area can be immense. However, nanoparticles tend to agglomerate to larger particles (i.e., surface area is diminished) and after final cleaning the nanoparticles have to be removed extensively [9,10]. Binding TiO 2 to a support (e.g., membrane [11][12][13][14]) decreases the overall surface area but the degradation of pollutants can be executed in one step. Designing a porous support can overcome the surface area issues of a supported system. Membranes are ideal support systems as they are highly porous and can be produced easily, are cost effective, and exist in many different forms according to the need of the consumer. The pollutant is directly transported through the membrane to the photocatalyst for degradation. Slow transport of the pollutant to the photocatalyst (e.g., diffusion) is avoided. To generate a high surface area compound, the porosity should be high and the pore size low. Nonetheless, decreasing the pore size will increase the energy needed to operate the membrane system. Microfiltration membranes with a pore size of 0.22 and 0.45 µm have been successfully utilized [13,14].Other param...

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Polyaniline Films Fabricated by Pre‐Nucleation Electrodeposition Method with High Electrochemical Activity: Parameter Optimization and Analysis

Wang,

Chen

et al. 2023

Macro Chemistry & Physics

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Electrochromic Polyaniline (PANI) films with high electrochemical performance have been intensively pursued for their potential applications in various fields. Here, w e analyze the growth process of the PANI films synthesized by pre‐nucleation electrodeposition method and obtain the optimal parameters with highest electrochemical activity. The PANI film fabricated under high current density of 10 mA cm−2 and impact time of 0.2 s shows the best electrochemical performance. It has a maximum active charge of 22.3 mC cm−2. The optimum electrochemical performance is attributed to the loose and porous structure. The PANI films fabricated under the optimal parameters also show the flattest structure and the smooth surface. W e conclude a universal evaluation basis of the optimal conditions for the pre‐nucleation method. That is, in the nucleation stage, the potential curve should peak rapidly and then fall slowly to the valley without any upward growth; when entering into the low current density growth stage, the potential should fall rapidly to a certain value and grow at that potential smoothly. This work evokes a deeper understanding and controlling of the growth process of polymers.This article is protected by copyright. All rights reserved

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Fabrication of TiO2-modified polytetrafluoroethylene ultrafiltration membranes via plasma-enhanced surface graft pretreatment

Cited by 68 publications

References 29 publications

Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

Surface engineering and self-cleaning properties of the novel TiO2/PAA/PTFE ultrafiltration membranes

Synthesis of High Crystalline TiO2 Nanoparticles on a Polymer Membrane to Degrade Pollutants from Water

Polyaniline Films Fabricated by Pre‐Nucleation Electrodeposition Method with High Electrochemical Activity: Parameter Optimization and Analysis

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