Gaomi, China
Gaomi, China

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Hao L.,Qingdao University | Hao L.,Collaborative Innovation Center for Marine Biomass Fibers | Hao L.,Sunvim Group Co. | Wang R.,Qingdao University | And 5 more authors.
Cellulose | Year: 2016

First, a crude cellulase was used to treat cotton fabrics to investigate its influences on the physicochemical properties of cotton. The FTIR and XRD analyses both confirmed the enzymatic treatment could increase the crystallinity of cotton, especially at a higher cellulase dosage. Once treated, the number of dissociable groups (–COOH) in cotton decreased, while that of the reducing groups (–CHO) increased. Second, copper phthalocyanine (CuPc) was selected to prepare an anionic nanoscale pigment dispersion to detect its dyeability on different cotton samples. It was concluded that the enzymatic hydrolysis itself had no significant impacts on the pigment dyeing performance. However, cellulase protein still stayed on the cotton surface after treatment and produced an enhancement effect on the pigment uptake due to strong hydrophobic interactions between them. This could be verified by K/S measurement and SEM observations. © 2015, Springer Science+Business Media Dordrecht.


Hao L.,Qingdao University | Hao L.,Collaborative Innovation Center for Marine Biomass Fibers | Hao L.,Sunvim Group Co. | Wang R.,Qingdao University | And 5 more authors.
Carbohydrate Polymers | Year: 2015

In this research, titanium dioxide (TiO2) nano-fibers with a well-organized anatase structure were synthesized by a hydrothermal method. Their structural properties were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and transmission electron microscope (TEM) analysis, respectively. Subsequently, the TiO2 nano-fibers were optically excited under the ultraviolet (UV) irradiation to decolorize the reactive dye solution. The influences of initial pH, concentrations of reactive dye and TiO2 nano-fibers as well as irradiation time on rate of photocatalytic decolorization were investigated. Based on their excellent photocatalytic performance, a novel method for achieving the synchronized wash-off of reactive-dyed cotton and decolorization of resultant wastewater was developed. It was found that the wash fastness of reactive-dyed cotton after TiO2-based wash-off was equal to that after standard way. The influences of TiO2-based wash-off on the properties of cotton substrates were determined by Fourier transform infrared spectroscopy (FTIR), XRD, and scanning electron microscope (SEM) analysis, respectively, which indicated that this new synchronized method would exert few damages to the cotton substrate. © 2015 Elsevier Ltd.


Hao L.,Qingdao University | Hao L.,Collaborative Innovation Center for Marine Biomass Fibers | Hao L.,Sunvim Group Co. | Wang R.,Qingdao University | And 4 more authors.
Advanced Powder Technology | Year: 2016

In this research, a novel nano-pigment suspension was successfully prepared in an ultrasonic disruptor using crude cellulase as dispersant. The colloidal and rheological properties of this cellulase-based suspension such as zeta potentials, particle distribution and apparent viscosity were analyzed. The measurement of zeta potentials showed that the surface charges of pigment were adjustable along with the acid-base properties of external environment due to the amphoteric character of cellulase proteins. Subsequently, its stability to high-speed centrifuge, freeze-thaw treatment and ion intensity was carefully investigated. Thermo-gravimetric analysis (TGA) was conducted to demonstrate the coverage of pigment particles by cellulase proteins. Furthermore, X-ray diffraction (XRD) characterization was utilized to disclose the combined impacts of cellulase and ultrasonic power on the crystal structures of pigment. At last, the coloring performance of this charge-adjustable nano-pigment suspension on cotton substrates was evaluated by measuring their K/S values and color fastness. Scanning Electron Microscope (SEM) was carried out to give a direct observation of the nano-pigment distributed on cotton surfaces. © 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.


Hao L.Y.,Qingdao University | Hao L.Y.,Sunvim Group Co. | Qi Z.Z.,Sunvim Group Co. | Men Y.J.,Sunvim Group Co. | And 6 more authors.
Advanced Materials Research | Year: 2013

In this research, a commercial acid cellulase was used to treat the cotton fabric for investigating its adsorptive and hydrolytic properties. First, it was found that this cellulase could get its optimal reactivity at temperature 50°C and pH 4.5-5.5. Then, at this best condition, the adsorptive and hydrolytic performance of cellulase on cotton fabric was evaluated. The characterization of bio-treated cotton fabrics was analyzed by XRD, which demonstrated that the enzymatic attack would improve the crystallinity of the cotton. © (2013) Trans Tech Publications, Switzerland.


Hao L.Y.,Qingdao University | Hao L.Y.,Sunvim Group Co. | Men Y.J.,Sunvim Group Co. | Qi Z.Z.,Sunvim Group Co. | And 6 more authors.
Advanced Materials Research | Year: 2013

In this research, the influences of acid cellulase on indigo backstaining at cotton surface were investigated. It was observed that more amount of celluase protein bound on the cotton would result in higher backstaining, indicating the direct adsorption between cellulase and indigo. It was also found that smaller indigo particle could generate higher backstaining because of its bigger specific area. At last, nonionic surfactant AEO-9 and protease were added to investigate their ability to remove backstaining. It was concluded that both of them could reduce the backstaining efficiently. © (2013) Trans Tech Publications, Switzerland.


Hao L.,Qingdao University | Hao L.,Sunvim Group Co. | Wang R.,Qingdao University | Zhang L.,Qingdao University | And 6 more authors.
Cellulose | Year: 2014

In this research, the stabilization effect of cellulase on the decomposition of hydrogen peroxide was investigated for the first time. It was concluded that, regardless of the decomposition mechanism, the cellulase protein could contribute significantly to peroxide stability. This effect stems from the formation of molecular hydrogen bonding between peroxide and cellulase protein or direct sequestering of free metal ions by amino acids in cellulase. Furthermore, based on this stability, a combined biopolishing and peroxide bleaching protocol was developed to improve cotton quality more efficiently. Afterwards, physicochemical properties such as the weight and strength loss, water absorbency, and carbonyl and carboxyl group content of treated cotton cellulose were measured to show the feasibility of the new method. Fourier-transform infrared (FT-IR) and X-ray diffraction (XRD) analyses indicated that the crystallinity index of cotton was increased due to the preferential hydrolysis of amorphous cellulose by cellulase. © 2013 Springer Science+Business Media Dordrecht.


PubMed | Sunvim Group Co., Shandong University and Qingdao University
Type: | Journal: Carbohydrate polymers | Year: 2015

In this research, titanium dioxide (TiO2) nano-fibers with a well-organized anatase structure were synthesized by a hydrothermal method. Their structural properties were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and transmission electron microscope (TEM) analysis, respectively. Subsequently, the TiO2 nano-fibers were optically excited under the ultraviolet (UV) irradiation to decolorize the reactive dye solution. The influences of initial pH, concentrations of reactive dye and TiO2 nano-fibers as well as irradiation time on rate of photocatalytic decolorization were investigated. Based on their excellent photocatalytic performance, a novel method for achieving the synchronized wash-off of reactive-dyed cotton and decolorization of resultant wastewater was developed. It was found that the wash fastness of reactive-dyed cotton after TiO2-based wash-off was equal to that after standard way. The influences of TiO2-based wash-off on the properties of cotton substrates were determined by Fourier transform infrared spectroscopy (FTIR), XRD, and scanning electron microscope (SEM) analysis, respectively, which indicated that this new synchronized method would exert few damages to the cotton substrate.

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