Abstract:Low cost superhydrophobic cotton fabric was developed using TiO 2 /cyanate ester coating for the first time. The TiO 2 /cyanate ester coated cotton fabric displayed superhydrophobic behaviour with water contact angle of 158°, sliding contact angle of 8°a nd surface free energy of 18.0 mN/m 2 . Besides, the TiO 2 /cyanate ester coated cotton fabric also possesses excellent laundry durability as well as stability against acid, alkali salt solutions and mechanical abrasion. Consequently, the TiO 2 /cyanate ester … Show more
“…= "b") and 6.97 (H arom. ="c") adjacent to the −OH proton, and at 9.15 ppm for aromatic −OH (−OH= "d"), 60 whereas 1 H NMR spectra of its degraded product do not show any proton NMR signals related to BPA molecules, but the emergence of a few new aliphatic peaks at lower chemical shift values (ppm) supports the mineralization of the BPA molecules (Figure 6b). 56 The photodegradation of BPA was also subjected to a TOC analysis.…”
Section: Characterization Transmission Electron Microscopy (Tem) the ...mentioning
A melamine−formaldehyde polymer (MFP)-based nanocomposite decorated with silver phosphate (Ag 3 PO 4 ) nanoparticles, named Ag 3 PO 4 −MFP, was fabricated. The as-synthesized Ag 3 PO 4 −MFP nanocomposite was used for the sunlight-promoted photocatalytic degradation of bisphenol A (BPA), a colorless endocrine disruptor. Kinetic studies were performed to examine the photocatalytic efficiency of the Ag 3 PO 4 −MFP nanocomposite under dark (control set), bulb light, and sunlight conditions, and the efficiency of photodegradation under sunlight was found to be higher. Ag 3 PO 4 −MFP shows faster photodegradation of BPA with 97% removal efficiency with short half-life value of ∼10.6 min, representing a significant influence of sunlight. To understand the plausible mechanism, radical-scavenging experiments were performed that suggest the involvement of holes (h + ), which further generate hydroxyl radicals during the process of photodegradation and are responsible for the degradation of BPA. The photodegradation of BPA was confirmed by comparative proton nuclear magnetic resonance and total organic carbon analysis. For practical applicability, we extended our photodegradation experiment using Ag 3 PO 4 −MFP to externally spiked samples of BPA in different industrial wastewater samples and observed >70% BPA removal. Moreover, the concentration-dependent antibacterial activity of Ag 3 PO 4 −MFP was performed on two bacterial strains, Escherichia coli and Bacillus subtilis, where the nanocomposite shows effective antibacterial activity.
“…= "b") and 6.97 (H arom. ="c") adjacent to the −OH proton, and at 9.15 ppm for aromatic −OH (−OH= "d"), 60 whereas 1 H NMR spectra of its degraded product do not show any proton NMR signals related to BPA molecules, but the emergence of a few new aliphatic peaks at lower chemical shift values (ppm) supports the mineralization of the BPA molecules (Figure 6b). 56 The photodegradation of BPA was also subjected to a TOC analysis.…”
Section: Characterization Transmission Electron Microscopy (Tem) the ...mentioning
A melamine−formaldehyde polymer (MFP)-based nanocomposite decorated with silver phosphate (Ag 3 PO 4 ) nanoparticles, named Ag 3 PO 4 −MFP, was fabricated. The as-synthesized Ag 3 PO 4 −MFP nanocomposite was used for the sunlight-promoted photocatalytic degradation of bisphenol A (BPA), a colorless endocrine disruptor. Kinetic studies were performed to examine the photocatalytic efficiency of the Ag 3 PO 4 −MFP nanocomposite under dark (control set), bulb light, and sunlight conditions, and the efficiency of photodegradation under sunlight was found to be higher. Ag 3 PO 4 −MFP shows faster photodegradation of BPA with 97% removal efficiency with short half-life value of ∼10.6 min, representing a significant influence of sunlight. To understand the plausible mechanism, radical-scavenging experiments were performed that suggest the involvement of holes (h + ), which further generate hydroxyl radicals during the process of photodegradation and are responsible for the degradation of BPA. The photodegradation of BPA was confirmed by comparative proton nuclear magnetic resonance and total organic carbon analysis. For practical applicability, we extended our photodegradation experiment using Ag 3 PO 4 −MFP to externally spiked samples of BPA in different industrial wastewater samples and observed >70% BPA removal. Moreover, the concentration-dependent antibacterial activity of Ag 3 PO 4 −MFP was performed on two bacterial strains, Escherichia coli and Bacillus subtilis, where the nanocomposite shows effective antibacterial activity.
“…The separation efficiency of SE/cotton fabric was observed to be about 95.8% (black line) and flux value was found to be 6800 L/m 2 h (blue line), which was comparatively equivalent to those of thermoset polymeric resin coated fabric. 28,30 To explore the separation efficiency and flux values of the other samples, the oil-water experiment was performed by replacing the SE/cotton membrane with E/cotton and S/cotton, respectively. The observed results of separating efficiency and flux values E/cotton and S/cotton are presented in Figure 16 and Figure 17 respectively in order to compare with the results of SE/cotton.…”
Section: Oil-water Separation Of the Coated Fabricsmentioning
confidence: 99%
“…19,55 To predict the durability after mechanical abrasion (Figure 2), the fabric was tested using 200g load over the coated fabric and kept in contact with sandpaper (1000 mesh), and tested with a moving speed of 4 cms −1 . 30 Figure 2.Schematic representation mechanical abrasion test.…”
A simple, durable, superior UV-shielded, self-cleanable, hydrophobic/superoleophile cotton fabric was developed using SBA-15 mesoporous silica and epoxy coating (SE). The cotton fabric surfaces after coating with SE showed the highest water contact angle value of 146° and lowest surface free energy of 13.9 mN/m. As a filtration membrane, the developed SE/cotton delivered 95.8% oil–water separation efficiency with a notable flux value of 6800 L/m2h against diesel–water mixture. The presence of an epoxy and silica hybrid layer on the surfaces of cotton fabric induced self-cleaning behavior and notable durability against UV light (UPF-29), pH resistance, washing fastness, and mechanical abrasion. Hence, the present coating developed using mesoporous silica and epoxy can be applied to different types of textile substrates to construct durable low-cost membranes.
“…Most cyanate ester resin monomers are crystalline solid or semi-solid states at room temperature, and the melting point is usually around 80 • C or higher. At high temperature ( >120 • C), the monomers transform into prepolymers with a lower viscosity [19], and the structure and cure exothermic temperatures of monomers need to be considered. The flexible molecular structure of monomers was observed in the curing process to prepare the CER materials [20].…”
Section: Curing Behavior Of the Cer-e Monomermentioning
In the blending process of the composites, the clustering of MWCNTs under high concentration leads to poor dispersion and difficult complexing with luminescent elements. Cyanate ester resins (CERs) have a brittle network structure when cured caused by a conjugation effect that forms a strong emission peak in the ultraviolet-visible region and quenches the luminescent elements of the fluorescent nanofillers. In this paper, by anchoring of the Eu complex (Eu(TTA)3Phen, ETP) on a surface of longitudinal split unzipped carbon nanotubes (uMWCNTs); fluorescent nanoparticles were prepared as ETP anchor unzipper carbon nanotubes (ETP-uCNTs). Dicyanate ester of bisphenol E (CER-E monomer) is cured to polycyanurate at a lower temperature to achieve a high conversion, promoting a uniform blend with ETP-uCNTs, providing the fluorescence environment with high color purity. Studies show the ETP-uCNTs solve the agglomeration of MWCNTs and improve the interface binding ability. Compared with the pure CER-E, the tensile strength, bending strength and impact strength of CER-E/0.8 wt.% ETP-uCNT hybrid nanocomposites are increased by 94.6%, 92.8% and 101.1%, respectively. The carbon residue rate of CER-E/ETP-uCNTs is up to 47.14% at 800 °C, the temperature of the maximum reaction rate decreases by 67.81 °C, and the partial absorption of ultraviolet light is realized between 200 and 400 nm.
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