Beijing Shoufa Tianren Ecological Landscape Co.

Beijing, China

Beijing Shoufa Tianren Ecological Landscape Co.

Beijing, China
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Li S.,Beijing Forestry University | Li Y.,Beijing Shoufa Tianren Ecological Landscape Co. | Shi J.,Beijing Forestry University | Zhao T.,Beijing Forestry University | Yang J.,Beijing Forestry University
Ecological Engineering | Year: 2017

External-soil spray seeding has gradually become a widely used technology for slope ecological rehabilitation in China in the 21st century. Meanwhile, with ever-increasing amounts of municipal sewage sludge being produced, sewage sludge has become a new source of solid waste pollution in the environment. Therefore, the goal of this study was to utilize sludge as a new kind of spray seeding component to replace non-renewable turfy soil. Orthogonal experiments were conducted to optimize the substrate formulation regarding the four factors of soil-to-sludge ratio, fiber content, soil additive concentration, and bioorganic fertilizer concentration. The results showed that sludge improved the physical and chemical properties of the substrate, increased plant growth, and within a certain range of dosage, reduced runoff and soil loss. The improvements of soil bulk density, total porosity and soil nutrients were particularly notable (P < 0.01). Plant growth in experimental groups was better than that of control groups (P < 0.05), and Festuca arundinace performed best among the three plants (P < 0.01). In addition, besides the physical and chemical properties, fiber content mainly affected plant growth, and soil additive reduced runoff and soil loss, whereas bioorganic fertilizer showed no obvious effect. After the experiments, a simple model was used to integrate the effects of the four factors on 28 parameters and thus to get the optimum component proportions, which were a soil-to-sludge ratio of 6:4 (v/v), fiber content of 15% (v/v), and soil additive concentration of 0.6 kg m−3. © 2017 Elsevier B.V.

Li C.,Beijing Forestry University | Zhang J.,Beijing Forestry University | Yi Z.,Beijing Forestry University | Yang H.,Beijing Shoufa Tianren Ecological Landscape Co. | And 3 more authors.
International Journal of Adhesion and Adhesives | Year: 2016

The application of phenol-formaldehyde (PF) resin adhesive has been greatly limited due to its toxicity, non-renewability and high-cost. Tannin, which is mostly extracted from renewable bark, could serve as an environmentally friendly bio-based polyphenol material. In this paper, phenol-tannin-urea-formaldehyde (PTUF) resins were prepared by copolymerization of tannin, urea, phenol and formaldehyde. Plywood bonded with those resins was prepared as well. The properties of PTUF resins were characterized by Fourier transform infrared spectroscopy (FTIR) and thermal gravimetric analysis (TGA). The results showed that the bonding strength of plywood bonded with the optimized PTUF resin could meet the Chinese National Standard (GB/T 17657-2013) for type I plywood. The optimized formula of PTUF resin adhesive was as follows: T/(P+T)=20%, U/(P+T)=30%. The bonding strength of plywood bonded with the optimized PTUF resin was 0.86 MPa, and the formaldehyde emission was 0.13 mg/L which would meet the requirement of E0 class plywood in accordance with Chinese National Standard (GB/T9846.1-9846.8-2004). TGA results showed that the thermal stability of the PTUF resin was better than that of PF resin in the initial thermal degradation. Therefore, the optimized PTUF resin is a promising substitution of PF resin in some aspects of the wood industry. © 2015 Elsevier Ltd.

Duan J.,Beijing Forestry University | Jiang J.,Beijing Forestry University | Li J.,Beijing Forestry University | Liu L.,Beijing Forestry University | And 2 more authors.
Journal of Nanomaterials | Year: 2015

Molecules that associate to form cross-links by hydrophobic association are designed and synthesised. Hydrogels, based on cellulose nanowhiskers (CNWs), acrylamide (AM), and stearyl methacrylate (C18), were synthesised by micellar copolymerisation, using ammonium peroxydisulfate as an initiator. CNWs composite hydrogels were characterised by Fourier transform infrared spectroscopy (FTIR) and their morphologies were investigated by scanning electron microscope (SEM). The system shows the original extensibility up to about 2500%: the tensile strength and compressive strength have maximum values of 1.338 MPa and 2.835 MPa, respectively. Besides excellent mechanical properties, CNWs composite hydrogels also have the ability to self-heal and remould: this is mainly attributed to the dissociation and reassociation of the associated micelles. In contrast to conventional cellulose hydrogels, these systems, when broken or cut, can be simply repaired by bringing together fractured surfaces to self-heal at room temperature. © 2015 Jiufang Duan et al.

Duan J.,Beijing Forestry University | Han C.,Beijing Forestry University | Liu L.,Beijing Forestry University | Jiang J.,Beijing Forestry University | And 3 more authors.
Journal of Spectroscopy | Year: 2015

A novel cellulose-chitosan gel was successfully prepared in three steps: (1) ferrocene- (Fc-) cellulose with degrees of substitution (DS) of 0.5 wt% was synthesised by ferrocenecarboxylic acid and cellulose within dimethylacetamide/lithium chloride (DMAc/LiCl); (2) the β-cyclodextrin (β-CD) groups were introduced onto the chitosan chains by reacting chitosan with epichlorohydrin in dimethyl sulphoxide and a DS of 0.35 wt%; (3) thus, the cellulose-chitosan gel was obtained via an intermolecular inclusion interaction of Fc-cellulose and β-CD-chitosan in DMA/LiCl, that is, by an intermolecular inclusion interaction, between the Fc groups of cellulose and the β-CD groups on the chitosan backbone at room temperature. The successful synthesis of Fc-cellulose and β-CD-chitosan was characterised by 13C-NMR spectroscopy. The gel based on β-CD-chitosan and Fc-cellulose was formed under mild conditions which can engender autonomous healing between cut surfaces after 24 hours: the gel cannot self-heal while the cut surfaces were coated with a solution of a competitive guest (adamantane acid). The cellulose-chitosan complex made by this method underwent self-healing. Therefore, this study provided a novel method of expanding the application of chitosan by binding it with another polymer. © 2015 Jiufang Duan et al.

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