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SSRN 2023年

作者： Wang, Dian Wan, Xiang Wang, Jiafei Mangelings, Debby Sun, Yuanshe Li, Tong Xu, Qin Xie, Fazhi Li, Weihua Qu, Qishu Key Laboratory of Functional Molecule Design and Interface Process Anhui Province Engineering Laboratory of Advanced Building Materials School of Materials Science and Chemical Engineering Anhui Jianzhu University Hefei230601 China Department of Analytical Chemistry Applied Chemometrics and Molecular Modelling Vrije Universiteit Brussel Laarbeeklaan 103 BrusselsB-1090 Belgium Dalian Elite Analytical Instruments Co. Ltd. Dalian116023 China College of Chemistry and Chemical Engineering Yangzhou University Yangzhou225002 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse School of Environment and Energy Engineering Anhui Jianzhu University Hefei230601 China

In this work, SiO2 core-shell spheres with a dendritic pore structure were used as chromatographic support and TiO2 was coated into the pores of the SiO2@dSiO2 shell using tetrabutyl orthotitanate (TBOT) as the titanium source. By simply prolonging the reaction time, a TiO2 layer with a uniform and controllable thickness was obtained on the surface of SiO2 core-shell spheres by Ostwald ripening. The thickness of the TiO2 layer can be achieved by either controlling the reaction time or controlling the amount of TBOT. When the concentration of TBOT was 0.06 mol L-1, the thickness of the TiO2 layer can be tuned from 15 to about 44 nm by changing the reaction time. When the concentration of TBOT was 0.08 mol L-1, the thickness of the TiO2 layer can be tuned from 21 to about 71 nm by changing the reaction time. C18-derived core-shell spheres with a TiO2 layer thicknesses of 40 nm (C18-SST-0.5-60) and 70 nm (C18-SST-0.7-30) were used as packings to evaluate the effect of TiO2 layer thickness on the chromatographic separation performance. The separation performance of C18-SST-0.5-60 was better than that of C18-SST-0.7-30. The separation efficiency of C18-SST-0.5-60 and C18-SST-0.7-30 for fluorene was 115112 plates m-1 and 83189 plates m-1, respectively. The columns were also used for the separation of basic, acidic and nucleoside mixtures. Both TiO2-coated core-shell packings showed good peak symmetry for basic samples, with peak asymmetry factors below 1.11. The relative standard deviations of the retention time of polycyclic aromatic hydrocarbons and anilines for intraday, interday and column-to-column variation were all lower than 6%. The results demonstrate that the TiO2 based stationary phase possesses great potential for high performance liquid chromatographic separation. © 2023, The Authors. All rights reserved.

关键词： Silica

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Sio2@Dsio2@Tio2 Core-Shell Stationary Phase with Uniform and Tunable Tio2 Thickness for Hplc Separation

SSRN

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SSRN 2022年

作者： Wang, Dian Wan, Xiang Wang, Jiafei Mangelings, Debby Sun, Yuanshe Li, Tong Xu, Qin Xie, Fazhi Li, Weihua Qu, Qishu Key Laboratory of Functional Molecule Design and Interface Process Anhui Province Engineering Laboratory of Advanced Building Materials School of Materials Science and Chemical Engineering Anhui Jianzhu University Hefei230601 China Department of Analytical Chemistry Applied Chemometrics and Molecular Modelling Vrije Universiteit Brussel Laarbeeklaan Brussels103-B-1090 Belgium Dalian Elite Analytical Instruments Co. Ltd. Dalian116023 China College of Chemistry and Chemical Engineering Yangzhou University Yangzhou225002 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse School of Environment and Energy Engineering Anhui Jianzhu University Hefei230601 China

In this work, SiO2@dSiO2 core-shell spheres with radial pore structure are used as the support and tetrabutyl orthotitanate (TBOT) is used as the Ti source to coat TiO2 into the pores of the SiO2@dSiO2 shell. Then, by simply prolonging the reaction time, a TiO2 layer with uniform and controllable thickness is obtained on the surface of SiO2@dSiO2 by Ostwald ripening. The thickness of the TiO2 layer can be achieved by controlling the reaction time or controlling the amount of TBOT. When the amount of TBOT is 0.5 mL (0.06 mol L-1), the thickness of the TiO2 layer can be tunable from 15 to about 44 nm by changing the reaction time. When the amount of TBOT is 0.7 mL (0.08 mol L-1), the thickness of the TiO2 layer can be tunable from 21 to about 71 nm by changing the reaction time. C18-derived core-shell spheres with TiO2 layer thicknesses of 40 nm (C18-S@S@TiO2-0.5-60) and 70 nm (C18-S@S@TiO2-0.7-30) were prepared under the conditions of 0.5 mL TBOT for 60 min reaction time and 0.7 mL TBOT for 0.5 h reaction time, respectively. They were used as packings to evaluate the effect of TiO2 layer thickness on chromatographic separation performance. The separation performance of C18-S@S@TiO2-0.5-60 is better than that of C18-S@S@TiO2-0.7-30. The separation efficiency of C18-S@S@TiO2-0.5-60 to fluorene is 115112 plates m-1, and that of C18-S@S@TiO2-0.7-30 is 83189 plates m-1. The two TiO2-modified core-shell packings have good peak symmetry for basic samples, and the asymmetry factors are both less than 1.11. However, the column efficiency of C18-S@S@TiO2-0.5-60 is higher than that of C18-S@S@TiO2-0.7-30. The separation efficiency of C18-S@S@TiO2-0.5-60 for N, N-dimethylaniline is 46714 plates m-1, while that of C18-S@S@TiO2-0.7-30 is only 34685 plates m-1. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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Eggshell as an adsorbent for removing dyes and metallic ions in aqueous solutions

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Cleaner Chemical Engineering 2022年 2卷

作者： Rayane de Oliveira Zonato Bianca Ramos Estevam Isadora Dias Perez Valquíria Aparecida dos Santos Ribeiro Rosane Freire Boina Laboratory of Water Wastewater and Reuse – Faculty of Technology and Sciences São Paulo State University (UNESP) Roberto Símonsen St 305 Presidente Prudente-SP 19060-900 Brazil Laboratory of Optimization Design and Advanced Control - Faculty of Chemical Engineering University of Campinas (UNICAMP) Albert Einstein Ave 500 Campinas-SP 13083-852 Brazil Laboratory of Studies in Environmental Technologies – Technological Federal University of Paraná (UTFPR) 635 Marcilio Dias St Apucarana-PR 86812-460 Brazil

Contamination of water with metallic ions and dyes leads to several impacts on the environment and human health. The adsorption comes as an economic and simple process to remove these pollutants from water. The use of residues as adsorbents can make the process even more sustainable and cheaper. This work proposes the use of a solid residue (eggshells) as an adsorbent of dyes - Reactive Blue 198 (RB) and Direct Black 22 (DB) - and metallic ions (Cd 2+ and Cr 3+ ). The solid was characterized by SEM, EDS, FTIR, BET and pH-PZC; and the adsorption process was investigated for the adsorbent dosage, kinetic and isotherm analysis. The quantifications of dyes and metallic ions were determined by UV-VIS spectroscopy and atomic absorption spectroscopy, respectively. The eggshells presented a porous structure, with a surface area of 435 cm 2 .g −1 , composed mainly of CaCO 3 and a neutral surface charge at pH 7. It was verified that the phenomenon occurs by chemical interactions between the adsorbents and the adsorbates, having the external transport as the limit step. Regarding the isotherm models, the dyes fit the Langmuir model and the metallic ions to the Dubinin-Radushkevich model. 1.0 g of eggshells was sufficient to adsorb 96 % of RB; 97 % of BD; 99 % of Cd 2+ ; and 95 % of Cr 3+ . Thus, the process analyzed in this research shows to be a promising alternative for removing these water pollutants while giving use to a solid residue.

关键词： Hazardous pollutants Textile dye wastewater Bioadsorbent Batch adsorption Wastewater treatment

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FLAMMABILITY AND TOXICITY OF COMPOSITE-MATERIALS FOR MARINE VEHICLES

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NAVAL ENGINEERS JOURNAL 1990年第5期102卷 45-54页

作者： SEVART, JL GRIFFIN, OH GURDAL, Z WARNER, GA Jeffrey L. Sevart:is a native of Kansas and a 1985 graduate of Kansas State University with a B.S. in mechanical engineering (magna cum laude). After working as a stress analysis engineer at Boeing Military Airplane Company in Wichita Kans. he attended Virginia Polytechnic Institute and State University and received an M.S. in engineering mechanics in February 1988. He currently resides in Akron Ohio working as a research engineer in tire composites research at The Goodyear Tire and Rubber Company. O. Hayden Griffin Jr.:received his B.S. and M.S. in mechanical engineering from Texas Tech University in 1970 and 1971 respectively. He received his Ph.D. in engineering mechanics from Virginia Polytechnic Institute and State University in 1980. Prior to joining the faculty of Virginia Polytechnic Institute and State University as associate professor of engineering science and mechanics in September 1985 he was employed at the U.S. Naval Surface Warfare Center (Dahlgren Virginia) BF Goodrich Tire Group (Akron Ohio) the Bendix Advanced Technology Center (Columbia Maryland) and the Johns Hopkins University Applied Physics Laboratory (Laurel Maryland). He is currently an associate director of the Virginia Institute for Material Systems. He is a registered professional engineer in Virginia and is a member of the American Society of Mechanical Engineers and the American Society for Composites. Zafer Gürdal:received his M.S. in mechanical and aerospace engineering from Illinois Institute of Technology in 1981 and his Ph.D. in aerospace engineering from Virginia Polytechnic Institute and State University in 1985. He worked as a research associate in the Aerospace and Ocean Engineering Department at Virginia Tech before joining the Engineering Science and Mechanics Department as an assistant professor in September 1985. Professor Gürdal's research interests include: composite structures failure mechanics of composites structural optimization and damage tolerant design. He is a member of the American Institute

Characteristics of both thermoplastic and thermoset composite materials as they pertain to marine vehicle applications are discussed. Comparison of various material selection factors such as strength, damage and moisture resistance, and flammability and toxicity as well as cost and availability of thermoset and thermoplastic composite materials are presented. Methods for testing and reducing the flammability and toxicity are discussed. Many commercially available composite systems are reported to provide favorable characteristics for marine applications. Although there seems to be a need for improved production technology for thermoplastics, they present potential advantages in physical properties over thermoset composites.

关键词： Composite Materials

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FERMENTATION AND GENETIC-ENGINEERING - PROBLEMS AND PROSPECTS

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BIO-TECHNOLOGY 1983年第10期1卷 847-&页

作者： BULL, DN Daniel N. Bull Ph.D. is a consultant in fermentation technology and president of Satori Corporation P.O. Box 1730 Montclair N.J. 07042. (201) 783-9787.REFERENCES Graff G.M. Short H. and Keene J.1983. Gene-splicing methods move from lab to plant. Chem. Eng.90: 22-27.|ISI|Broda P.1979. p. 1-3. Plasmids. W. H. Freeman Oxford and San Francisco.Donoghue D.J. and Sharp P.A.1978. Construction of a hybrid bacteriophage-plasmid recombinant DNA vector. J. Bact.136: 1192-1196.|PubMed|ISI|ChemPort|Bok S.H. Hoppe D. Mueller D.C. and Lee S.E.1983. Improving the production of recombinant DNA proteins through fermentation development. Abstract from 186th ACS Natl. Mtg. Washington D.C. Sept. 1.Maniatis T. Fritsch E.F. and Sam-brook J.1982. p. 88. Molecular Cloning. Cold Spring Harbor Laboratory. Guidelines for research involving recombinant DNA molecules June 1983 Fed. Reg.48: 24556-24581. Modifications of physical containment recommendations for large-scale uses of organisms containing recombinant DNA molecules. 1983. Recomb. DNA Tech. Bull.6: 69-70.Bull D.N. Thoma R.W. and Stinnett T.E.1983. Bioreactors for submerged culture. In:Adv. in Biotechnological Proc. A. Mizrahi and A. L. van Wezel (eds.) 1: 1-30.Schmidli B.L. and Swartz R.W.1982. Design considerations for aseptic fermentation. Presentation at 184th ACS Natl. Mtg. Kanas City MO.Sittig W.1982. The present state of fermentation reactors. J. Chem. Tech. Biotechnol.32: 47-58.|ISI|Strek F.1963. Intl. Chem. Eng.3: 533.Uhl V.W. and Gray J.B.1996. Mixing Theory and Practice Vol. I. Academic Press New York.Peters M.S. and Timmerhaus K.D.1968. p. 542. Plant Design and Economics for Chemical Engineers. McGraw-Hill New York.Dickey D.S. and Hicks R.W. Fundamentals of agitation. Chem. Eng.83: 93-100.Oldshue J.Y.1983. Fluid mixing technology and practice. Chem. Eng.90: 82-108.Kipke K.D.1981. Heat transfer in aerated non-Newtonian fluids. Abstract from 2nd Eur. Cong. Biotech. Eastbourne UK April 5-10.Blakebrough N. McM

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