Dongguan Cleaner Production Center

Dongguan, China

Dongguan Cleaner Production Center

Dongguan, China

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Huang G.,South China University of Technology | Wang M.,Dongguan University of Technology | Wang M.,Dongguan Cleaner Production Center | Hu Y.,South China University of Technology | And 2 more authors.
PLoS ONE | Year: 2017

In this study, two kinds of cellulose derivatives (polyanionic cellulose (PAC) and hydroxypropylmethyl cellulose (HPMC)) were selected as stabilizers of Pd/Fe nanoparticles (NPs) to investigate their influences on the debromination performances of 2,2',4,4'-tretrabromodiphenyl ether (BDE47). Field emission scanning electron microscope (FE-SEM) images revealed that the cellulose-stabilized Pd/Fe NPs were smaller and more uniform than the bare-Pd/Fe NPs. X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) results suggested that cellulose coatings found on Pd/Fe NPs surfaces featured some antioxidation abilities, which followed the order of HPMC < PAC. Sedimentation tests demonstrated that the stabilizing power of PAC for Pd/Fe NPs was higher than that of HPMC. Fourier transfer infrared spectrometer (FTIR) results indicated that PAC molecules were bound to the Pd/Fe NPs surfaces by polar covalent bonds and hydrogen bonds, while HPMC molecules interacted with the nanoparticles by hydrogen bonds. Batch debromination test for BDE47 demonstrated that the catalytic debromination rate with cellulose-stabilized Pd/Fe NPs was higher than that with bare-Pd/Fe NPs during reaction period of 15 min. Overall, this study indicated that both celluloses are beneficial to forming smaller, more regular, stable and antioxidative Pd/Fe NPs, leading to higher debromination reactivity for BDE47 compared with the bare-Pd/Fe NPs. Therefore Pd/Fe NPs can be utilized as a promising remediation technology for the contaminated groundwater and soils. © 2017 Huang et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Xu Y.,Dongguan University of Technology | Xu Y.,Dongguan Cleaner Production Center | Liao J.,Dongguan Cleaner Production Center | Cai Q.,South China University of Technology | And 2 more authors.
Advanced Materials Research | Year: 2013

The SiO2 coated Al thin films deposited on glass substrate for solar front reflectors were designed using Essential Macleod Program (EMP) and successfully fabricated by magnetron sputtering. The obtained thin films showed high reflectivity (up to 89.51%) under the light wavelength ranged from 250 to 2500 nm, which was identical with calculated results. Moreover, the thin films showed high anti-corrosion properties after the harsh abrasion tests. The high performance of the thin films was mainly attributed to the SiO2 layer, which served as a good protection without serious degradation of reflectivity, demonstrating the bright prospects for outdoor solar front reflectors. © (2013) Trans Tech Publications, Switzerland.


Yang S.,Dongguan University of Technology | Yang S.,Dongguan Cleaner Production Center | Liu Z.,Dongguan University of Technology | Liu Z.,Dongguan Cleaner Production Center | And 8 more authors.
Journal of Materials Science | Year: 2014

In this study, we demonstrate the use of poly (ethylene oxide) (PEO) for in-situ modification of the inner surface of halloysite nanotubes (HNTs) with water molecules as the hydrogen bond forming medium, as well as the nano-confinement of PEO molecular chains within the nanotube. Before testing, the Soxhlet experiment of PEO/HNTs powder is applied in order to remove the physical adsorption of PEO molecules onto the outmost surface of HNTs. The crystal temperature of PEO changes sharply from 36.9 °C of neat PEO to -25 °C of PEO in the PEO/HNTs powder and the decomposed temperature of PEO in the PEO/HNTs powder is about 13.1 °C higher than that of neat PEO, which is mainly owing to the nano-confinement effect of PEO within the HNTs with a diameter of about 10 nm. From thermo-gravimetric (TG) analysis, about 7.71 % by weight of PEO has been chemically bonded to HNTs. The hydrogen bonds among PEO, HNTs, and water molecules are evidenced by FTIR and XPS performances. Meanwhile, the binding energy of Al2p in the innermost surface of HNTs shifts from 74.7 eV in the neat HNTs to 74.5 eV in the PEO/HNTs powder, while that of Si2p on the outmost surface of HNTs keeps almost constant, indicating that the hydrogen bonds only exists inner the nanotube and PEO molecular chains have been trapped in nano-scale within HNTs, which is in accordance with the DSC and TG observation. © 2014 Springer Science+Business Media New York.


Yang S.,Dongguan University of Technology | Yang S.,Dongguan Cleaner Production Center | Liu Z.,Dongguan University of Technology | Liu Z.,Dongguan Cleaner Production Center | And 4 more authors.
Journal of Materials Science | Year: 2014

Effect of molecular weight on conformation, helix structure (H structure) and trans planar structure (T structure), of Poly(ethylene oxide) (PEO) has been investigated in detail by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimeter. Two main diffraction peaks at about 2θ = 19° and 23° are discovered, and XRD patterns reveal that the unit cell of crystalline PEO belongs to the monoclinic lattice. The crystallinity decreases from 93.82 to 59.62 %, and the deviation of crystalline temperature of PEO-0.5 is larger than those of the other three under four reheated cycles. From FTIR results, a red shift about 11 cm−1is observed in the stretching vibration of –C–O–C– with increasing molecular weight, suggesting the presence of chain–chain interactions to restrict the stretching vibration of -C–O–C– in main chains. Meanwhile, the bending region of –C–C–O– at about 533 cm−1sensitive to tension shifts to lower wavenumber, and a new peak at about 510 cm−1emerges with increasing molecular weight, which is the indicator of internal tension/strain and orientation. Furthermore, the peak intensity ratios of H structure decrease with increasing molecular weight. In contrast, T structure increases dramatically. Consequently, with respect to molecular weight, the possible interactions, entanglements and tie molecules, of PEO molecular chains to explain the difference between H and T structure is proposed, which is in agreement with the experimental observations quite well. © 2014, Springer Science+Business Media New York.


Ye Y.,South China University of Technology | Xu Y.,Dongguan University of Technology | Liu Y.,Dongguan Cleaner Production Center | Tu W.,South China University of Technology | Liao J.,Dongguan University of Technology
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2013

Surface metallized polymers were widely used in many fields due to their excellent properties. Since the adhesion of metal film to the base polymer is usually poor, their practical applications was limited. In order to solve this problem, several surface modification techniques were employed to modify the surface properties of polymer. The reason of adhesion weakness was analyzed. The progress of polymer surface modification techniques, such as ion implantation, plasma treatment, ion beam irradiation, chemistry, photo-chemistry and excimer laser etching was reviewed. The modification effects and mechanisms of these techniques were also compared. At last, the direction and problems of industrial application were prospected on the basis of current research status.


Zhong S.,Dongguan University of Technology | Zhong S.,Dongguan Cleaner Production Center | Mo J.,Wuyi University | Li Y.,Dongguan University of Technology | Liu Y.,Dongguan University of Technology
Chinese Journal of Environmental Engineering | Year: 2016

2, 4-dichlorophenol, 2, 4, 6-trichlorophenol, and pentachlorophenol are typical representatives of chlorophenols. As chlorophenols have caused great harm to human health and the environment, they are classified as environmental priority pollutants in many countries. The adsorption of these chlorophenols onto powdered activated carbon (PAC) was studied, with a focus on the effects of PAC dosage, pH, and water quality on adsorption performance. The results indicated that more than 80% of the chlorophenols could be adsorbed by PAC, which follows the Freundlich and Langmuir adsorption isotherms. Particularly, chlorophenols in the molecular state were adsorbed more easily by PAC than those in the ionized state. © 2016, Science Press. All right reserved.


Yang S.,Dongguan University of Technology | Yang S.,Dongguan Cleaner Production Center | Liu Z.,Dongguan University of Technology | Liu Z.,Dongguan Cleaner Production Center | And 6 more authors.
Journal of Materials Science | Year: 2013

Compatibility property, as well as crystalline morphology, of NBR/PEO blends has been investigated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and polarized optical microscopy (POM) thoroughly. There is no apparent shift of nitrile or ether groups in the FTIR spectra of NBR/PEO blends. Based on the calculations from glass transition temperature, the maximum volume fraction of PEO dissolved in NBR phase is about 6.41 % in blend with 5 wt% PEO content (PEO-5), indicating a weak intermolecular interaction in the NBR/PEO blends. From the characteristic absorption bands in the FTIR spectra, XRD and POM graphs, the crystallinity ratio of NBR/PEO blends decreases as the NBR content increases, which is further proved by DSC measurement that the crystallinity ratio and crystal melting temperature of pure PEO are 82.6 %, 69.9 C, and that of PEO-5 are 16.9 %, 59.5 C. This illuminates that the weak intermolecular interaction will affect the crystallinity ratio and crystal melting temperature of the NBR/PEO blends. © 2013 Springer Science+Business Media New York.


Yang S.,Dongguan University of Technology | Yang S.,Dongguan Cleaner Production Center | Liu B.,South China University of Technology | Liu Z.,Dongguan University of Technology | And 3 more authors.
Polymer International | Year: 2016

A novel borate ester (BE)-grafted carboxylated acrylonitrile butadiene rubber (XNBR) was synthesized. From Fourier transform infrared, 1H NMR and elemental analyses, the borate ester was successfully grafted to XNBR, resulting in a more flexible XNBR chain as revealed by differential scanning calorimetry. The binding energies of boron, oxygen, lithium and chlorine atoms of XNBR-g-BE-LiClO4 are quite different from those of XNBR or LiClO4. Meanwhile, the wavenumbers of C-O-B-O-C, C=O and C-H vibrations of the benzene ring shift towards lower values and a new shoulder peak for - at about 2260cm-1 emerges. By integrating fitting peak areas of - groups and ClO4 -, the fractions of - group and ClO4 - bidentate bonding in XNBR-g-BE-LiClO4 are much higher than in NBR-LiClO4. Based on these experiments, a possible dissociation mechanism is proposed in which the boron atom of XNBR-g-BE receives electron pairs from ClO4 -, releasing partial positive charge of Li+ to bind with - group. © 2016 Society of Chemical Industry.


PubMed | Dongguan University of Technology, South China University of Technology and Dongguan Cleaner Production Center
Type: | Journal: Environmental science and pollution research international | Year: 2016

In this paper, Fe

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