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| 1 | Structural Evolvement of Heating Treatment of Mg/AI-LDH and Preparation of Mineral Mesoporous Materials显示文摘Although hydrotalcite, or layered double hydroxides (LDHs), is not a common mineral, it is an important material that can be easily synthesized in laboratory. In this study, structural evolvement and BET surface area changes of heat treated Mg/Al-LDH is evaluated by XRD, TEM and N2-BET analyses. The results indicate that the magnesium-aluminum LDH with carbonate as interlayer anion, periclase-like oxides was formed at temperatures of 400-800℃. Meanwhile, 2-3 nanometer mesoporous were formed during decomposition of LDH. However, the heat treated samples still preserve the morphology of the original LDH plates. Periclase-like formed from LDH heat treatment may re-hydrolyze and recover the structure of LDH. However, crystallinity of the recovered LDH is lower than that of the original LDH. This heat treatment will result in formation of (Mg, Al)-oxide nano-crystals and nanopores among the nano-crystals. When heating temperature exceeds 1000, the periclase-like (Mg, Al)-oxide is transformed into a composite with periclase (MgO) and spinel phases. The periclase can be re-hydrolyzed and dissolved in HCl solution. After acid treatment, the sample with a high surface area is composed of spinel nano-crystals and nanopores among them. Our results will provide a new and economic way to synthesize mesoporous materials through pathways of phase transformation of precursor materials with different composition. | CHEN Tianhu XU Huifang WANG Yifeng QING Chengsong FAN Mingde CHEN Gang | 2006 | Acta Geologica Sinica(English Edition)2006，80，2： | 5 |
| 2 | Study on Decoloration of Acidic Scarlet GR by Pyrolusite Oxidation under an Acid Condition显示文摘由软锰矿的酸的猩鸿的 GR 的去色在这篇论文被学习。软锰矿,反应温度,和颤动速度去色效率的氢指数答案,剂量和颗粒度的 Theeffects 被讨论。根据实验结果,去色效率可以由软锰矿为 40 mg/L GR 答案超过 95% 。氢指数在影响酸的猩鸿的 GR 的去色的所有因素之中是很重要的。软锰矿,反应温度,和颤动速度的剂量和颗粒度在去色上有小 benitfit。Thehigh 去色效率和在软锰矿和酸的猩鸿的 GR 之间的产品的货到付款以及英尺红外系列的低移动效率显示酸的猩鸿的 GR 在矿物质的接口上经历氧化还原反应,它的色基是 oxidated 和 decolored,但是它没被氧化彻底地移开。 | CHEN Gang QING Chengsong CHEN Tianhu LI Xiaoxuan SONG Yinxian PENG Shuchuan | 2006 | Acta Geologica Sinica(English Edition)2006，80，2： | 4 |
| 3 | Transformation relationship among different magnetic minerals within loess-paleosol sediments of the Chinese Loess Plateau显示文摘The dominant magnetic minerals and carriers of magnetic signals within the Chinese Loess Plateau are magnetite, maghemite, hematite, and goethite. In this study, we investigated the provenance and evo- lution of magnetic minerals during loess pedogenesis, using X-ray diffraction (XRD) and optical and electron microscopy, including field emission scanning electron microscopy (FESEM) and high- resolution transmission electron microscopy (HRTEM). Our results reveal that single- and multiphase mineral assemblages among magnetic minerals in the loess-paleosol sequence have been formed. Partial oxidation of coarse eolian magnetite has occurred in the desert source area and the oxidation degree is enhanced after deposition of the dust upon the Chinese Loess Plateau. This mode of origin resulted in a microtexture consisting of an inner magnetite core surrounded by a hematite rim, and strongly affected the magnetic characteristics of the loess. Goethite coexists with hematite in the loess and paleosol, and nanometer-scale hematite is formed upon goethite rims via dehydration. Our study provides direct mineralogical evidence of the magnetic record and paleoclimatic implications of the loess–paleosol sequence of the Chinese Loess Plateau. | XIE QiaoQin CHEN TianHu XU XiaoChun QING ChengSong XU HuiFang SUN YuBing JI JunFeng | 2009 | Science China Earth Sciences2009，52，3： | 2 |
| 4 | A new approach to prepare ZVI and its application in removal of Cr(VI) from aqueous solution显示文摘 | Dongyin Chang Tianhu Chen Haibo Liu Yunfei Xi Chengsong Qing Qiaoqin Xie Ray L. Frost | 2014 | Chemical Engineering Journal2014，，： | 1 |
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