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Engineering a tubular mesoporous silica nanocontainer with well-preserved clay shell from natural halloysite

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Nano Research 2017年第8期10卷 2782-2799页

作者： Liangjie Fu huaming Yang Aidong Tang yuehua hu Centre for Mineral Materials School of Minerals Processing and Bioengineering Central South University Changsha 410083 China Peter A. Rock Thermochemistry Laboratory and NEATORU University of California Davis One Shields Avenue Davis CA 95616 USA hunan Key Lab of Mineral Materials & Application Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China

The in situ synthesis of mesoporous nanotubes from natural minerals remains a great challenge. Herein, we report the successful synthesis of mesoporous silica nanotubes （MNTs） with a varying inner-shell thickness and a preserved clay outer shell from natural-halloysite nanotubes （HNTs）. After the enlargement of the lumen diameter of the tubular aluminosilicate clay by acid leaching, uniform mesopores were introduced by a modified pseudomorphic transformation approach, while the clay outer shell was well-preserved. Using density functional theory calculations, the atomic structure evolution and the energetics during A1 leaching and Si-OH condensation were studied in detail. After the leaching of A1 ions from the HNTs, local structural changes from Al（Oh） to A1（V） at a medium leaching level and to AI（Td） at a high leaching level were confirmed. The calculated hydroxylation energy of two kinds of silica components in the acid-leached HNTs （the distorted two-dimensional silica source in the inner shell and the intact aluminosilicate structure in the outer shell） was 0.5 eV lower or 1.0 eV higher than that of bulk silica, which clarifies the different behavior of the silica components in the hydrothermal process. The successful synthesis of reactive MNTs from HNTs introduces a new strategy for the synthesis of mesoporous nanocontainers with a special morphology using natural minerals. In particular, MNT samples with numerous reactive AI（V） species and a specific surface area up to 583 m^2/g （increased by a factor of 10） are promising drugloading nanocontainers and nanoreactors.

关键词： halloysite mesoporous nanotubes acid leaching hydrothermal synthesis density functional theory (DFT) calculation nanocontainer

FLOTATION　CLASSIFICATION　APPROACH　BY　CONTROLLING　INTERACTIONS　BETWEEN　PARTICLES

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维普期刊数据库

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中国有色金属学会会刊：英文版 1995年第4期5卷 58-63页

作者： Luo, Lin Qiu, Guanzhou hu, yuehua Wang, Dianzuo He, Boquan Central South Univ of Technology Changsha China

ＦＬＯＴＡＴＩＯＮＣＬＡＳＳＩＦＩＣＡＴＩＯＮＡＰＰＲＯＡＣＨＢＹＣＯＮＴＲＯＬＬＩＮＧＩＮＴＥＲＡＣＴＩＯＮＳＢＥＴＷＥＥＮＰＡＲＴＩＣＬＥＳＬｕｏＬｉｎ；ＱｉｕＧｕａｎｚｈｏｕ；ＨｕＹｕｅｈｕａ；ＷａｎｇＤｉａｎ... 详细信息

ＦＬＯＴＡＴＩＯＮＣＬＡＳＳＩＦＩＣＡＴＩＯＮＡＰＰＲＯＡＣＨＢＹＣＯＮＴＲＯＬＬＩＮＧＩＮＴＥＲＡＣＴＩＯＮＳＢＥＴＷＥＥＮＰＡＲＴＩＣＬＥＳＬｕｏＬｉｎ；ＱｉｕＧｕａｎｚｈｏｕ；ＨｕＹｕｅｈｕａ；ＷａｎｇＤｉａｎｚｕｏ（ＤｅｐａｒｔｍｅｎｔｏｆＭ...

关键词： flotation classification interactions theoretical model

Hydrophobic-surface of copper from converter slag in the flotation system

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International Journal of Mining Science and Technology 2013年第4期23卷 599-603页

作者： huang Hongjun Zhu Haifeng hu yuehua School of Mineral Processing and Bioengineering Central South University

The converter slag from a smeltery in Daye contains 2.01% *** floatability of copper has a significant influence on the flotation of converter *** tests,contact angle tests and FTIR were conducted to assess the influences of pH and different flotation concentrators on its hydrophobic process,mechanism and *** results show that since chemisorptions are formed on the surface,hydrophobicity of copper is highly enhanced by xanthate,butylamine dithiophosphate and *** hydrophobic-surface of copper becomes worse with low recovery in strong acid and alkali *** pH value is 10,butylamine dithiophosphate and butyl xanthate are used as the mixed-collector,the grade of copper is 40.01%and that of tailings is 0.37%.

关键词： Converter slag Copper Flotation Hydrophobic

Activation flotation and mechanism of lime-depressed pyrite with oxalic acid

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International Journal of Mining Science and Technology 2012年第1期22卷 63-67页

作者： huang Hongjun hu yuehua Sun Wei School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

Flotation tests, contact angle measurements, infrared spectrum analyses, X-ray analyses and computer simulation were carried out in order to study the activation mechanism of lime-depressed pyrite with oxalic acid. The results show that the oxalic acid effectively eliminated the hydrophilic calcium film from the surface of pyrite. Therefore, the efficiency of pyrite flotation was also activated. The results indicate that after reacting with hydrophobic insoluble remainders on the surface of pyrite, oxalic acid can pro- duce hydrophilic compounds, such as CaC03, Ca（OH）2 and Fe（OH）3. As a consequence, a flesh pyrite layer was exposed and its flotation activated.

关键词： Oxalic acid Pyrite Activation Mechanism

Flotation mechanism of octylic hydroxamic acid on diaspore

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Chinese Journal Of Geochemistry 2013年第2期32卷 191-194页

作者： LIU Sanjun QIN Wenqing PENG Tiefeng hu yuehua School of Mineral Processing and Bioengineering Central South University School of Chemical Engineering The University of Queensland

Bauxite resources are widely spread in the earth. However, the effective utilization of this mineral is still under infant. The conventional collector for diaspore mineral is oleic acid. It has three main drawbacks which are highly insoluble, large dosages in bauxite flotation, and low selectivity, which hinder its application in industry. In this research, octylic hydroxamic acid was synthesized, and its collecting ability toward two major minerals in bauxite-diaspore and kaolinite was investigated. The collecting power of various reagents for diaspore are shown as follows: oleic acid

关键词：一水硬铝石异羟肟酸浮选机理辛酸铝土矿资源吸附能力硬水铝石电位测试

CARRIER FLOTATION OF ULTRAFINE PARTICLE WOLFRAMITE

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中国有色金属学会会刊：英文版 1994年第4期4卷 10-15页

作者： hu, yuehua Qiu, Guanzhou Luo, Lin Xu, Jin Wang, Dianzuo Central South Univ of Technology Changsha China

ＣＡＲＲＩＥＲＦＬＯＴＡＴＩＯＮＯＦＵＬＴＲＡＦＩＮＥＰＡＲＴＩＣＬＥＷＯＬＦＲＡＭＩＴＥ￥Ｈｕ，Ｙｕｅｈｕａ；Ｑｉｕ，Ｇｕａｎｚｈｏｕ；Ｌｕｏ，Ｌｉｎ；Ｘｕ，Ｊｉｎ；Ｗａｎｇ，Ｄｉａｎｚｕｏ（ＭｉｎｅｒａｌＥｎｇｉ... 详细信息

ＣＡＲＲＩＥＲＦＬＯＴＡＴＩＯＮＯＦＵＬＴＲＡＦＩＮＥＰＡＲＴＩＣＬＥＷＯＬＦＲＡＭＩＴＥ￥Ｈｕ，Ｙｕｅｈｕａ；Ｑｉｕ，Ｇｕａｎｚｈｏｕ；Ｌｕｏ，Ｌｉｎ；Ｘｕ，Ｊｉｎ；Ｗａｎｇ，Ｄｉａｎｚｕｏ（ＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇＤｅｐａｒｔｍｅｎｔ...

关键词： wolframite carrier flotation mechanism

Removal and utilization of calcite existed in scheelite by preparation of calcium sulfate whiskers

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International Journal of Mining Science and Technology 2017年第6期27卷 1005-1010页

作者： Guan Qingjun Sun Wei hu yuehua Guan Changping Yin Zhigang Zhang Chenhu School of Mineral Processing and Bioengineering Central South University Changsha 410083 China

In order to eliminate the effect of calcite associated with scheelite on the scheelite flotation, hydrochloric acid was used to dissolve the calcite, and the soaking solution was used to prepare CaSO_4 whiskers by hydrothermal reaction with sulfuric acid at ambient pressure. First, the condition experiments of preparing CaSO_4 whiskers by using CaCl_2 and H_2SO_4 were carried out to optimize reaction parameters of the crystallization process. The optimal conditions were: at 102 ℃ reaction temperature, 0,5 mol/L reactant concentration and 60 min reaction time. Then based on the condition experiments and considering keeping acid concentration stable for achieving HCl recycling, Calcium sulfate whiskers with the average diameter of 1.41 μm and the average aspect ratio of 109 were prepared by the soaking solution after evaporating to half of its volume and 1.0 mol/L H_2SO_4 at 102 ℃ for 60 min: After ion exchange processing,the filtrate could be used as HCl in the process of HCl dissolution.

关键词： Calcium sulfate whiskers Scheelite Calcite HCl Hydrothermal reaction

Surface chemical study of the selective separation of chalcopyrite and marmatite

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Mining Science and Technology 2010年第4期20卷 542-545页

作者： LIU Runqing SUN Wei hu yuehua WANG Dianzuo School of Minerals Processing and Bio-engineering Central South UniversityChangsha 410083China

FCLS (Ferric Chromium Lignin Sulfonate) was used to aid the separation of chalcopyrite from marmatite. Flotation, adsorption and zeta-potential tests of treated marmatite and chalcopyrite were performed. The flotation of marmatite was strongly depressed, while that of chalcopyrite was only slightly depressed, over a wide range of pH values when FCLS was used as depressant in the presence of Butyl Xanthate (BX). The adsorption of BX onto chalcopyrite or marmatite takes place over a wide pH range. The adsorption density of BX on chalcopyrite and marmatite decreases as the pH increases. The adsorption density of FCLS onto marmatite is greater than the adsorption density onto chalcopyrite. The zeta potentials of chalcopyrite and marmatite become more negative due to the addition of xanthate and FCLS.

关键词： flotation depressant sulfide ore froth flotation

Intercalated 2D nanoclay for emerging drug delivery in cancer therapy

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Nano Research 2017年第8期10卷 2633-2643页

作者： Yi Zhang Mei Long Peng huang huaming Yang Shi Chang yuehua hu Aidong Tang Linfeng Mao Department of Inorganic Materials School of Minerals Processing and Bioengineering Central South University Changsha 410083 China Xiangya Hospital Central South University Changsha 410078 China hunan Key Laboratory of Mineral Materials and Application Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China

Natural two-dimensional （2D） kaolinite nanoclay has been incorporated into an emerging drug delivery system. The basal spacing of the kaolinite nanoclay was expanded from 0.72 to 4.16 nm through the intercalation of various organic guest species of different chain lengths, which can increase the efficiency in drug delivery and reduce the toxicity of doxorubicin （DOX）. Original kaolinite （Kaolin） and the Kaolin intercalation compounds exhibited a high level of biocompatibility and very low toxicity towards cells of pancreatic cancer, gastric cancer, prostate cancer, breast cancer, colorectal cancer, esophageal cancer, and differentiated thyroid cancer. However, lung cancer and hepatocellular cancer cells need more strict compositional, structural, and morphological modulations for drug delivery carriers. DOX-Kaolin and the DOX-Kaolin intercalation compounds showed dramatically faster drug release in moderately acidic solution than in neutral condition, and exhibited enhanced therapeutic effects against ten model cancer cell cultures in a dose-dependent manner. The use of 2D nanoclay materials for a novel drug delivery system could feasibly pave a way towards high-performance nanotherapeutics, with superior antitumor efficacy and significantly reduced side effects.

关键词： cancer therapy nanoclay intercalation drug delivery biocompatibility