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Gan W.,Northeast Forestry University | Gao L.,Northeast Forestry University | Zhan X.,Dehua TB New Decoration Material Co. | Li J.,Northeast Forestry University
RSC Advances | Year: 2016

Thiol-functionalized magnetic sawdust, synthesized by precipitating γ-Fe2O3 nanoparticles on the sawdust surface and then modifying the 3-mercaptopropyltrimethoxysilane layers, has been investigated as an environmentally friendly and recyclable adsorbent for heavy metal ions. The process of modifying was confirmed by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Compared with the nonmagnetic sawdust, the thiol-functionalized magnetic sawdust possesses high saturation magnetization (7.28 emu g-1), and can be easier and faster to separate from water under an external magnetic field. The adsorption equilibrium was reached within 20 min and the adsorption kinetics were elucidated by a pseudo-second-order model. The adsorption isotherms of Cu2+, Pb2+ and Cd2+ fitted well with the Langmuir model, exhibiting an adsorption capacity of 5.49 mg g-1, 12.5 mg g-1 and 3.80 mg g-1, respectively. Competitive adsorption among the three metal ions showed a preferential adsorption of Pb2+ > Cu2+ > Cd2+. In addition, the magnetic sawdust adsorbent exhibited excellent acid-alkali stability and the metal-loaded adsorbent was able to regenerate in an acid solution without significant adsorption capacity loss. © The Royal Society of Chemistry 2016. Source


Gan W.,Northeast Forestry University | Gao L.,Northeast Forestry University | Zhan X.,Dehua TB New Decoration Material Co. | Li J.,Northeast Forestry University
RSC Advances | Year: 2015

Magnetic wood would have potential uses in electromagnetic shielding, indoor electromagnetic wave absorption and heavy metal adsorption. In this study, magnetic wood composites with improved thermal stability and mechanical properties as well as UV resistance were prepared by modification with magnetic CoFe2O4 and hydroxyapatite (HAP) via a hydrothermal process. The functional groups and morphology of the modified wood were examined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy-dispersive X-ray analysis (EDXA). The results indicated that the magnetic CoFe2O4 nanoparticles precipitated on the wood substrate during the alkali treatment, and then the hydroxyapatite was grown on the wood surface via the electrostatic interactions between the calcium cations and the negatively charged OH- anions. Moreover, the magnetic, thermal and mechanical performances and the UV-resistance of the CoFe2O4/HAP-modified wood composites were also evaluated. This journal is © The Royal Society of Chemistry. Source


Gao L.,Northeast Forestry University | Gan W.,Northeast Forestry University | Xiao S.,Northeast Forestry University | Zhan X.,Dehua TB New Decoration Material Co. | Li J.,Northeast Forestry University
Ceramics International | Year: 2016

Ag-TiO2 heterostructures with Ag nanocrystals and TiO2 particles well-grown on wood substrate was achieved by a two-step protocol combining hydrothermal synthesis and silver mirror reaction. The investigation of the photocatalytic ability demonstrated that the wood coated with Ag-TiO2 composite film possess excellent photocatalytic activity, superior to the wood coated with pure TiO2 particles, for the degradation of phenol under visible-light illumination. The Ag/TiO2-coated wood was further modified by (heptadecafluoro-1,1,2,2-tetradecyl)trimethoxysilane, which acted as a crucial role in improving the repellency toward water and imparting self-cleaning property to the wood products. The modified wood has potent antibacterial activity toward both Gram-positive and Gram-negative bacterium. The multifunctional film coated on wood surface exhibits a good photodegradation of organic pollutant and a robust superhydrophobicity, leading to an important application in self-cleaning. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source


Gao L.,Northeast Forestry University | Xiao S.,Northeast Forestry University | Gan W.,Northeast Forestry University | Zhan X.,Dehua TB New Decoration Material Co. | Li J.,Northeast Forestry University
RSC Advances | Year: 2015

A simple hydrothermal process with further hydrophobization was developed for fabricating durable superamphiphobic films of cuprous oxide (Cu2O) microspheres on a wood substrate. With the advantages of simple operation, low cost, short reaction time, and environmental friendliness, the present method can be well adapted to fabricate Cu2O microstructures on wood surfaces. Meanwhile, the wood coated with a hydrolysis product from long chain fluoroalkyl silane of (heptadecafluoro-1,1,2,2-tetradecyl)trimethoxysilane has a durable superhydrophobic and superoleophobic surface and the coating shows excellent durability to acid, high temperature and humidity, and abrasion. The coatings effectively protect the substrate from damages, expanding the wood application fields. The functional coating may have a broad prospect of applications from the bridges and buildings to automobiles and other possible aspects. © 2015 The Royal Society of Chemistry. Source


Gao L.,Northeast Forestry University | Zhan X.,Dehua TB New Decoration Material Co. | Lu Y.,Chinese Academy of Forestry | Li J.,Northeast Forestry University | Sun Q.,Northeast Forestry University
Materials Letters | Year: 2015

TiO2 thin films with different wettability were fabricated on the wood surfaces by a simple low-temperature hydrothermal method with the precursor solution pH adjusted by hydrochloric acid/sodium hydroxide. The morphologies of TiO2 films have been changed from sphere species to filmy ones by adjusting pH of precursor solution. The TiO2 films synthesized at the precursor solution pH of 1-10 were mainly primary existed in anatase phase without other structure, and the TiO2-treated wood surfaces presented different wettability with the water contact angles ranged from 9.6° to 132.7°, when the precursor solution pH were controlled to the range of 1-14. Such a wood surface with the desirable wettability shows great potential, as it may be selectively used in the various environments with different humidity. © 2014 Elsevier B.V. All rights reserved. Source

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