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Luo Y.,Fujian Normal University | Luo Y.,Fujian Key Laboratory of Pollution Control and Resource Reuse | Wang K.,Fujian Key Laboratory of Pollution Control and Resource Reuse | Xu Y.,Fujian Key Laboratory of Pollution Control and Resource Reuse | And 4 more authors.
New Journal of Chemistry | Year: 2015

CuO-CeO2 nanofibers with relatively high surface area (EL-CuCe) have been successfully prepared by the electrospinning method and investigated for total benzene oxidation. The improved low-temperature performance of EL-CuCe compared to ST-CuCe (prepared by the surfactant-templated method) is attributed to the better reducibility of Cu ions that are incorporated into the ceria lattice. Moreover, more oxygen vacancies and weakly bound oxygen species (e.g., O2 -, O2 2- or O-) observed on EL-CuCe keep in step with its higher low-temperature oxidation activity. However, without small amounts of bulk CuO, reduction of some surface ceria occurs at 480 °C for EL-CuCe, which probably accounts for its unsatisfactory high temperature performance. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2015.

She C.,Fujian Normal University | She C.,Fujian Key Laboratory of Pollution Control and Resource Reuse | Wang J.,Fujian Normal University | Tong C.,Fujian Normal University
Wetland Science | Year: 2015

Sulphate-reducing bacteria (SRB) are anaerobic microorganisms that use sulphate as a terminal electron acceptor in, for example, the degradation of organic compounds. They are ubiquitous in anoxic habitats, where they have an important role in both the sulphur and carbon cycles. Traditional methods based on laboratory culture techniques have been proven inadequate to describe the vast microbial diversity, because those methods miss more than 99% of the organisms while enriching those thriving in cultures but not numerically or functionally important in the environment. Introduction of molecular methods independent of culture techniques has vastly improved the potential to describe microbial diversity. The 16S ribosomal RNA (rRNA) gene is by far the most frequently used phylogenetic marker for studying microbial ecology and diversity in the environment. An additional approach includes the sequencing of functional genes that are unique to the physiology of the group of microorganisms studied. Sulphate-reducing bacteria have been characterized by employing the 16S rRNA gene or functional genes as molecular markers in soils of wetlands. Studies to date have differentiated communities by analysis of clone libraries or by community fingerprinting by terminal restriction fragment length polymorphism (T-RFLP) or by denaturing gradient gel electrophoresis (DGGE) relying on differences in restriction fragment lengths between taxa. Additionally, fluorencence in situ hybridization (FISH) and real-time quantitative polymerase chain reaction (real-time qPCR) have also been applied for quantification of wetland-inhabiting sulphate-reducing bacteria. In plant-inhabited soils or sediments of the wetlands, a particularly important microhabitat is the rhizosphere, or region immediately surrounding and influenced by the plant roots. Key biogeochemical processes such as organic matter decomposition and pollutant degradation occur at accelerated rates in the rhizosphere and greatly influence ecosystem functions. This paper reviews two types of important marker genes of sulphate-reducing bacteria in molecular detection and the molecular biological tools used for detecting the diversity of sulphate-reducing bacteria in soils of the wetlands, such as T-RFLP, DGGE, FISH and real-time qPCR. At the same time, the interaction between sulfate-reducing bacteria and plants in the wetland are also summarized. Based on review of the literature, further studies on diversity of sulphate-reducing bacteria in soils of wetlands are suggested.

Lin X.,Fujian Normal University | Zhang H.,Fujian Normal University | Ke M.,Fujian Normal University | Xiao L.,Fujian Normal University | And 5 more authors.
Polymer Bulletin | Year: 2014

The non-isothermal crystallization kinetics of pure poly(ethylene terephthalate) (PET), PET/mica and PET/TiO2-coated mica composites were investigated by differential scanning calorimetry with different theoretical models, including the modified Avrami method, Ozawa method and Mo method. The activation energies of non-isothermal crystallization were calculated by Kissinger method and Flynn-Wall-Ozawa method. The results show that the modified Avrami equation and Ozawa theory fail to describe the non-isothermal crystallization behavior of all composites, while the Mo model fits the experiment data fair well. It is also found that the mica and TiO 2-coated mica could act as heterogeneous nucleating agent and accelerate the crystallization rates of PET, and the effect of TiO 2-coated mica is stronger than that of mica. The result is further reinforced by calculating the effective activation energy of the non-isothermal crystallization process for all composites using the Kissinger method and the Flynn-Wall-Ozawa method. © 2014 Springer-Verlag Berlin Heidelberg.

Yu B.,Fujian Normal University | Jin X.,Fujian Normal University | Jin X.,Fujian Key Laboratory of Pollution Control and Resource Reuse | Kuang Y.,Fujian Normal University | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

In our previous study, naphthalene was degraded by Bacillus fusiformis (BFN) strain. However, the understanding of degradation of naphthalene is still limited, therefore, in this study, we further explored the process. Results showed that the growth of BFN increased with the increasing concentration of naphthalene. When naphthalene concentrations were 30, 50, 100 and 200 mg/L, biomass (OD600) were 0.057, 0.081, 0.126 and 0.193, respectively. Nevertheless, the removal efficiency of COD decreased with the increasing the concentration of naphthalene, indicating that naphthalene was used as its sole carbon source. The biodegradation of naphthalene fitted well to the first-order kinetic model while the growth kinetics of BFN satisfied well to the logistic model. Furthermore, SEM, UV and FT-IR were employed to characterize the degradation of naphthalene. SEM indicated that the morphology of cells grew better in the presence of naphthalene. UV-vis showed that adsorption peak of naphthalene at 276 nm significantly declined after degradation. Finally, FT-IR data demonstrated that the new bands at 2878, 2930, 2968, 3438, 3667 and 3731 cm-1 were formed, confirming that carboxyl group and phenolic compounds were existed in degraded solution.

Luo Y.,Fujian Normal University | Luo Y.,Fujian Key Laboratory of Pollution Control and Resource Reuse | Wang X.,Fuzhou University | Qian Q.,Fujian Normal University | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2014

A series of LaNi1-xFexO3 (x = 0.0, 0.2, 0.4, 0.7, and 1.0) perovskites were synthesized and characterized by X-ray diffraction (XRD), N2 physisorption, scanning electron microscopy (SEM), H2-temperature-programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS). The perovskites were investigated for selective catalytic reduction of NOx by hydrogen (H2-SCR). It is shown that Fe addition into LaNiO3 leads to a promoted efficiency of NOx removal, as well as a high stability of perovskite structure. Moreover, easy reduction of Ni3+ to Ni2+ with the aid of appropriate Fe component mainly accounts for the enhanced activity. Meanwhile, deactivation of the sulfated catalysts is due to that sulfates mainly deposit on active Ni component while doping of Fe can protect Ni to some extent at the expense of partial sulfation. © 2014 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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