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以纤维素气凝胶为模板合成孔隙结构可调的二氧化钛 被引量:5
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作者 张晓婷 王莎 +3 位作者 彭新文 敬霜霜 孙润仓 钟林新 《造纸科学与技术》 2018年第4期28-35,共8页
以生物质纤维素气凝胶为新型模板合成了具有多级孔隙结构的三维(3D) TiO_2。研究发现,通过改变制备条件可有效调控纤维素气凝胶的多级结构,进而调控TiO_2的孔隙结构。以具有壁腔结构的纤维素气凝胶为模板制得的TiO_2保留了原来模板的结... 以生物质纤维素气凝胶为新型模板合成了具有多级孔隙结构的三维(3D) TiO_2。研究发现,通过改变制备条件可有效调控纤维素气凝胶的多级结构,进而调控TiO_2的孔隙结构。以具有壁腔结构的纤维素气凝胶为模板制得的TiO_2保留了原来模板的结构,而以相互连接的纳米纤维气凝胶为模板制得的TiO_2则形成与原模板明显不同的孔隙结构。TiO_2晶粒大小受TiO_2前驱体浓度的影响,但不受模板孔隙结构的影响。制备的3D TiO_2具有高孔隙率与比表面积分别高达0. 690 cm3/g、102 m2/g;同时,制得的TiO_2具有高的光催化活性,可在55 min内使甲基橙的降解率超过95%,高于商业化的TiO_2纳米颗粒。 展开更多
关键词 生物质 纤维素 气凝胶 TIO2
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Structural Characterization of Lignins Isolated from Caragana sinica Using FT-IR and NMR Spectroscopy 被引量:3
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作者 XIAO Ling-ping SHI Zheng-jun +2 位作者 XU Feng sun run-cang Amar K Mohanty 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2011年第9期2369-2376,共8页
In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were c... In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and 1D and 2D Nuclear Magnetic Resonance(NMR).FT-IR spectra revealed that the "core" of the lignin structure did not significantly change during the treatment under the conditions given.The results of 1H and 13C NMR demonstrated that the lignin fraction L2,isolated with 70% ethanol containing 1% NaOH,was mainly composed of β-O-4 ether bonds together with G and S units and trace p-hydroxyphenyl unit.Based on the 2D HSQC NMR spectrum,the ethanol organosolv lignin fraction L1,extracted with 70% ethanol,presents a predominance of β-O-4′ aryl ether linkages(61% of total side chains),and a low abundance of condensed carbon-carbon linked structures(such as ββ′,β-1′,and β-5′) and a lower S/G ratio.Furthermore,a small percentage(ca.9%) of the linkage side chain was found to be acylated at the γ-carbon. 展开更多
关键词 Caragana sinica LIGNIN Structural characterization FT-IR NMR
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