Co-reporter:Yuyang Zhou and Ren-Cheng Tang
ACS Sustainable Chemistry & Engineering November 6, 2017 Volume 5(Issue 11) pp:10518-10518
Publication Date(Web):October 12, 2017
DOI:10.1021/acssuschemeng.7b02513
Natural bioactive compounds as promising alternatives to synthetic finishing agents have recently gained increasing attention in the textile industry due to their eco-friendliness, low irritation, and biocompatibility. The present study reports a sustainable approach for preparing antibacterial, antioxidant, and UV-protective silk fiber using two natural flavonoids (quercetin and rutin) by an adsorption technique. The adsorption kinetics and isotherms of the two flavonoids were investigated, and their functionalities and the washing durability of their functionalities were discussed. The equilibrium adsorption isotherms fitted well to the Langmuir and Freundlich adsorption models, demonstrating that ion–ion interactions, hydrogen bonding, and van der Waals forces play major roles in the adsorption of quercetin and rutin on silk. The adsorption isotherm parameters of quercetin and rutin had a decisive effect on their adsorption kinetics, which fit well to the pseudo-second-order kinetic equation. Quercetin exhibited higher initial adsorption rate, shorter half adsorption time, and higher adsorption capability than those of rutin due to its higher affinity constant. Quercetin also imparted better antioxidant, antibacterial, and UV protection performance to silk than rutin at the same initial application concentration and provided better washing durability of functionalities. This study demonstrates that quercetin and rutin can be employed as promising multifunctional agents for the chemical processing of silk materials.Keywords: Adsorption; Antibacterial activity; Antioxidant activity; Flavonoids; Silk; UV protection;
Co-reporter:Mohammad Shahid, Xian-Wei Cheng, Ren-Cheng Tang, Guoqiang Chen
Dyes and Pigments 2017 Volume 137() pp:277-283
Publication Date(Web):February 2017
DOI:10.1016/j.dyepig.2016.10.009
•Simple one-step process for the synthesis and deposition of AgNPs on silk using caffeic acid as reductant.•Visual colour changes and UV–vis spectra confirmed the synthesis of AgNPs.•SEM images showed uniform distribution of AgNPs on silk surface.•Silver content of treated fabrics increased with increasing concentration of silver nitrate and caffeic acid.•AgNPs@silk exhibited excellent fastness, highly durable antimicrobial and excellent UV-protective properties.This paper reports a simple one-step process for the in-situ synthesis and deposition of silver nanoparticles (AgNPs) on silk fabric by employing caffeic acid as an eco-friendly reductant. The formation of AgNPs was confirmed by visible colour changes and UV–visible spectra. The surface plasmon resonance band of AgNPs was observed at λmax ∼414–420 nm indicating spherical or roughly spherical AgNPs, which was further confirmed by TEM and SEM measurements. The surface of AgNPs treated silk showed roughness due to the deposition of AgNPs and the uniform distribution of roughly spherical AgNPs on silk surface was observed in SEM images. EDS analysis also confirmed the presence of silver in treated silk. An increase in the amount of caffeic acid and silver nitrate resulted in more silver being deposited on silk fabric. The caffeic acid assisted in-situ generation of AgNPs imparted golden yellow colour and good multi-functional properties to silk fabric. The treated fabrics showed excellent fastness towards washing, rubbing and light. The antibacterial effect was highly durable as more than 90% bacterial reduction was observed even after 10 washing cycles.
Co-reporter:Mohammad Shahid, Yuyang Zhou, Ren-Cheng Tang, Guoqiang Chen, Waseem A. Wani
Dyes and Pigments 2017 Volume 138(Volume 138) pp:
Publication Date(Web):1 March 2017
DOI:10.1016/j.dyepig.2016.11.012
•First time application of chlorogenic acid as natural dye for silk colouration.•CCD was used to determine interactive effects of process variables for optimized dyeing.•Light yellowish brown shades of varying hues with commercially acceptable fastness.•CA dyed silk showed excellent radical scavenging activity.Both the conventional one-factor-at-a-time (OFT) optimization, in which one of the factors is varied maintaining the other parameters fixed at constant levels, and the central composite design (CCD) optimization, in which all factors are varied simultaneously, were carried out for silk dyeing with chlorogenic acid. The CCD experiments were designed with the help of Design-Expert 10.0.3 software (trial version) and used for evaluating the interactive effects of the four most important operating variables namely pH, temperature, time and dye concentration. The colour characteristics, fastness properties, FT-IR spectra and antioxidant activity of dyed fabrics were also evaluated. The silk fabrics dyed with chlorogenic acid displayed light yellowish brown colour, and exhibited good fastness properties and excellent antioxidant activity.Download high-res image (478KB)Download full-size image
Co-reporter:Xian-Wei Cheng, Jin-Ping Guan, Xu-Hong Yang, Ren-Cheng Tang
Progress in Organic Coatings 2017 Volume 112(Volume 112) pp:
Publication Date(Web):1 November 2017
DOI:10.1016/j.porgcoat.2017.06.025
•Bio-based phytic acid and nano-TiO2 were used as flame retardants.•1,2,3,4-Butanetetracarboxylic acid was used as a cross-linker.•Phytic acid and nano-TiO2 had a joint flame retardant effect.•Treated silk showed durable flame retardancy.•Condensed-phase flame retardant mechanism was applicable.This research work reported a novel approach to develop flame retardant silk fabric using naturally occurring phytic acid (PA) rich in phosphorus and TiO2 nanoparticles through a pad-dry-cure technique. A polycarboxylic acid [1,2,3,4–butanetetracarboxylic acid (BTCA)] was employed to stabilize and improve the adhesion of TiO2 on silk surface. The flame retardancy of the treated silk fabric was determined in terms of limiting oxygen index, vertical burning, and pyrolysis combustion flow calorimetry, and the durability of flame retardancy to washing was discussed. PA and TiO2 were found to have a joint flame retardant effect. The combination of PA, TiO2 and BTCA was able to endow silk fabric with excellent flame retardancy, and the good flame retardant ability was kept even after 25 times of washing. The reasons for the good washing durability of the treated silk fabric were discussed. Finally, a significant condensed-phase flame retardant mechanism of the silk fabric treated with the PA/TiO2/BTCA system was revealed by the analyses of thermogravimetry and pyrolysis combustion flow calorimetry.Download high-res image (217KB)Download full-size image
Co-reporter:Yuyang Zhou, Ren-Cheng Tang
Dyes and Pigments 2016 Volume 134() pp:203-211
Publication Date(Web):November 2016
DOI:10.1016/j.dyepig.2016.07.016
•Curcumin is modified with a water-soluble reactive UV absorber.•Modified curcumin has greatly enhanced solubility in water.•Modified curcumin on silk fiber exhibits good color fastness.•Silk fiber dyed with modified curcumin exhibits good antibacterial and UV protection properties.Curcumin, derived from the ground roots of Curcuma longa L., has been extensively used to prepare colored and antibacterial textiles. Unfortunately, the applications of curcumin are limited due to its low water solubility, photo-sensitivity and poor fastness. In the present study, a novel water-soluble curcumin was synthesized by introducing a water-soluble reactive UV absorber into curcumin molecule, and applied in the dyeing and functional finishing of silk fabric. The modified curcumin showed good water solubility. The uptake of the modified curcumin by silk was more sensitive to the pH of dyebath than that of curcumin. Moreover, the silk fabric dyed with modified curcumin showed good color fastness (especially rub and light fastness), very good UV protection ability, and high antibacterial activity equivalent to that of the curcumin dyed silk, but its antioxidant activity was lower than that of the curcumin dyed silk. This study shows that the novel water-soluble curcumin can be synthesized through chemical modification and suitably applied to prepare multifunctional silk textiles.
Co-reporter:Yuyang Zhou, Zhi-Yi Yang, Ren-Cheng Tang
Materials Science and Engineering: C 2016 Volume 67() pp:336-344
Publication Date(Web):1 October 2016
DOI:10.1016/j.msec.2016.05.063
•A bioactive compound (baicalin) was applied to silk by an adsorption technique.•Baicalin had a high adsorption capability at a low pH.•The adsorption of baicalin on silk followed Langmuir model.•Baicalin-functionalized silk exhibited very good antioxidant, antibacterial and UV protective properties.•Baicalin-functionalized silk is a promising material for protective clothing and medical textiles.There has been a phenomenal increase in the research and development of new health and hygiene-related textile products. This work reports a novel approach to develop antibacterial, antioxidant and UV-protective silk using an adsorption technique of baicalin (a bioactive ingredient from the root of Scutellaria baicalensis Georgi). Baicalin displayed high adsorption capability at pH 2.75, contributing to the sufficient functionalities on silk. The equilibrium adsorption research showed that the Langmuir isotherm was able to describe the behavior of baicalin, indicating the electrostatic interactions between the ionized carboxyl groups in baicalin and the positively charged amino groups in silk. The treated silk with 2% owf (on the weight of fiber) baicalin exhibited excellent antioxidant activity, high antibacterial activities against Escherichia coli and Staphylococcus aureus, and very good ultraviolet protection ability comparable to that of the commercial benzotriazole ultraviolet absorber. The baicalin treatment had no obvious impact on the functional groups, crystal structure and surface morphology of silk. The functionalities of the treated silk obviously declined after first laundering cycle and slowly decreased in the following washing cycles. Encouraging results demonstrate that the baicalin-functionalized silk is a promising material for protective clothing and medical textiles.
Co-reporter:Hongxian Zeng and Ren-Cheng Tang
RSC Advances 2014 vol. 4(Issue 72) pp:38064-38072
Publication Date(Web):04 Aug 2014
DOI:10.1039/C4RA05874G
Two direct dyes were applied for dyeing the viscose/chitin bicomponent fiber, whose chitin component can provide functionalities and enhanced dyeing properties. Dyeing rates, adsorption isotherms and mechanisms, electrolyte and dye concentration dependence on dye adsorption, as well as dye desorption from dyed fiber, were investigated in comparison with dyeing system of regular viscose fiber. Higher adsorption and lower desorption of dyes occurred for viscose/chitin fiber. The viscose/chitin fiber showed great dye adsorption capability even at a low salt dosage providing environmental benefits for dyeing process. The rates of dye uptake by viscose/chitin fiber were faster and followed the pseudo-second-order kinetic model. Dye adsorption isotherms were closely correlated to the dual Langmuir–Nernst model consisting of site-specific and non-site-specific interactions between dyes and fibers; moreover, the Langmuir adsorption was predominant in total adsorption, and this predominance was more obvious for viscose/chitin fiber. The characteristics of above dye adsorption on viscose/chitin fiber resulted mainly from its partially deacetylated chitin component, which can reduce the negative charge density of the fiber and provide more site-specific dyeing sites.
Co-reporter:Sha-Sha Sun, Tieling Xing, and Ren-Cheng Tang
Industrial & Engineering Chemistry Research 2013 Volume 52(Issue 26) pp:8953
Publication Date(Web):June 6, 2013
DOI:10.1021/ie303350z
The use of polyphenol oxidases in low environmental impact biotechnology is launching a new dyeing technology in textile industry. In this work, the simultaneous coloration and functionalization of wool, silk, and nylon fabrics with the tyrosinase-catalyzed oxidation products of caffeic acid were investigated. The occurrence of polymerization of caffeic acid resulting in colored quinone derivatives was confirmed by UV–visible and Fourier transform infrared spectroscopies. The treated fabrics showed distinct color with excellent rub fastness and staining fastness but weak light fastness and color change fastness. The color depth of dyed fabrics depended greatly on the dosage of tyrosinase employed in the preparation of caffeic acid oxidation products and the pH of dyebath. The multifunctionalities of dyed fabrics such as deodorizing ability, UV protection capacity, antioxidant activity and hydrophilicity were achieved. Tyrosinase-catalyzed caffeic acid products can be used as potential colorants and functional finishing agents.
Co-reporter:Li Liu, Jun Zhang, Ren-Cheng Tang
Reactive and Functional Polymers 2013 73(11) pp: 1559-1566
Publication Date(Web):November 2013
DOI:10.1016/j.reactfunctpolym.2013.08.007
Co-reporter:Qing Li;Hui Tang
Journal of Applied Polymer Science 2012 Volume 125( Issue 2) pp:1193-1200
Publication Date(Web):
DOI:10.1002/app.36253
Abstract
The bleaching of modal/AN-g-casein fiber blend using hydrogen peroxide/tetraacetylethylenediamine (H2O2/TAED) activating system was investigated, and the influence of key factors on bleaching was determined. The whiteness index of bleached fabrics was greatly affected by sodium carbonate and H2O2/TAED dosages, and the dyeability of bleached fabrics with acid dyes was greatly dependent on H2O2/TAED dosages and bleaching temperature. Compared with the conventional H2O2 bleach under alkaline conditions, the activated bleach markedly decreased the loss of casein in AN-g-casein fiber due to its acidic conditions, and exhibited the advantages of energy saving and high efficiency. However, the fabrics bleached using the activated process had the poor acidic dyeing properties due to the oxidation of amino groups in AN-g-casein fiber. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Co-reporter:Sha-Sha Sun and Ren-Cheng Tang
Industrial & Engineering Chemistry Research 2011 Volume 50(Issue 8) pp:4217-4224
Publication Date(Web):March 11, 2011
DOI:10.1021/ie101505q
The adsorption and UV-protection properties of water-extract from honeysuckle whose main ingredient is chlorogenic acid onto wool were studied. The effect of initial pH on the adsorption was investigated, and the extent of adsorption was found to increase with decreasing pH in the range 2−7. Four kinetic equations, namely pseudo-first-order, pseudo-second-order, Elvoich, and intraparticle diffusion equations were employed to investigate the adsorption rates. The pseudo-second-order model provided the best fit to the experimental data and was indicated with the activation energy of 47.91 kJ mol−1. The equilibrium adsorption data were fitted by Freundlich, Langmuir, Redlich−Peterson, and Langmuir−Nernst isotherm models. The adsorption behavior accorded with Redlich−Peterson and Langmuir−Nernst models well. The honeysuckle extract showed good build-up properties, and the UV transmittance in the range of UVA and UVB of wool treated with honeysuckle extract decreased obviously while the ultraviolet protection factors increased. The extract of honeysuckle may be developed as a natural UV-absorbing agent applied to wool finishing.
Co-reporter:Ren-Cheng Tang, Hui Tang, and Cheng Yang
Industrial & Engineering Chemistry Research 2010 Volume 49(Issue 19) pp:8894-8901
Publication Date(Web):September 1, 2010
DOI:10.1021/ie100052b
The adsorption behaviors of tea polyphenols (TP) on wool, silk, and nylon at pH 4.0 were investigated. The Langmuir−Nernst model had the best fitting to the adsorption isotherms. The analysis of adsorption mechanism suggested that the hydrogen bonding and electrostatic interactions operating between TP and fibers contribute to Langmuir adsorption, whereas other interactions (hydrophobic interaction and van der Waals forces) contribute to Nernst partition adsorption. Langmuir adsorption had greater contribution to total adsorption of TP on nylon, whereas partition adsorption imparted greater influence to TP adsorption on silk. In terms of the mordant dyeing of TP, silk and wool displayed much deeper color than nylon due to their higher content of the functional groups having the complex-forming ability, although they had lower adsorption capability for TP than nylon. The colors of the dyed fabrics mordanted with different metallic salts as well as their depth, were greatly dependent on the chemical nature of mordants and fibers, the metal ion−TP−fiber complex-forming ability, and the related complex structure.
Co-reporter:Ren-Cheng Tang;Jie Mei
Journal of Applied Polymer Science 2008 Volume 110( Issue 2) pp:1195-1200
Publication Date(Web):
DOI:10.1002/app.28744
Abstract
The casein-acrylonitrile graft copolymer fiber was treated in sodium hydroxide, sodium carbonate, and sodium bicarbonate solutions to evaluate its alkali resistance which was very important for wet processing. The weight loss and whiteness of the treated fibers were examined. UV spectra of the alkaline treatment solutions and IR spectra of the treated fibers were analyzed. The study showed that the fiber exhibited poor alkali resistance. Treating temperature, alkali concentration, and strength affected the weight loss and whiteness of the treated fibers. A high weight loss was found even at low alkali concentration, and the obvious yellowing was observed at higher alkali concentration and temperature. The weight loss was primarily due to the hydrolysis of casein, whereas the yellowing was caused by the hydrolysis of nitrile groups and induced formation of CN conjugated system. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
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