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Yoko A, Okabe S, Seong G, Tomai T, Adschiri T. Core–shell structure formation strategy with hydrothermal synthesis: Importance of seeds, precursor concentration, and heterogeneous reaction. J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2019.104749] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kołodyńska D, Gęca M, Skwarek E, Goncharuk O. Titania-Coated Silica Alone and Modified by Sodium Alginate as Sorbents for Heavy Metal Ions. NANOSCALE RESEARCH LETTERS 2018; 13:96. [PMID: 29651652 PMCID: PMC5897277 DOI: 10.1186/s11671-018-2512-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 04/02/2018] [Indexed: 05/27/2023]
Abstract
The novel organic-inorganic biohybrid composite adsorbent was synthesized based on nanosized silica-titania modified with alginate within the development of effective adsorbent for heavy metal ions. Effects of metal species Cu(II), Zn(II), Cd(II), and Pb(II); concentrations; pH; temperature; and adsorption onto titania-coated silica (ST20) initial or modified by sodium alginate (ST20-ALG) were studied. The equilibrium and kinetic data of metal ions adsorption were analyzed using Langmuir and Freundlich adsorption models and kinetic models: pseudo first order, pseudo second order, intraparticle kinetic model, and Elovich. The maximum sorption capacities observed were higher for the ST20-ALG composite compared to the initial ST20 oxide for all studied metal ions, namely their values for ST20-ALG were 22.44 mg g- 1 for Cu(II) adsorption, 19.95 mg g- 1 for Zn(II), 18.85 mg g- 1 for Cd(II), and 32.49 mg g- 1 for Pb(II). Structure and properties of initial silica-titania ST20 and modified by sodium alginate ST20-ALG adsorbents were analyzed using nitrogen adsorption/desorption isotherms, ATR-FTIR, SEM-EDS, and pHpzc techniques.
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Affiliation(s)
- D Kołodyńska
- Department of Inorganic Chemistry, Faculty of Chemistry, Maria Curie Skłodowska University, M. Curie Skłodowska Sq. 2, 20-031, Lublin, Poland
| | - M Gęca
- Department of Inorganic Chemistry, Faculty of Chemistry, Maria Curie Skłodowska University, M. Curie Skłodowska Sq. 2, 20-031, Lublin, Poland
| | - E Skwarek
- Department of Radiochemistry and Colloid Chemistry, Faculty of Chemistry, Maria Curie Skłodowska University, M. Curie Skłodowska Sq. 3, 20-031, Lublin, Poland
| | - O Goncharuk
- Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str, Kyiv, 03164, Ukraine.
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New insights into the formation of submicron silica particles using CO2 as anti-solvent. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2017.10.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hyde EDER, Seyfaee A, Neville F, Moreno-Atanasio R. Colloidal Silica Particle Synthesis and Future Industrial Manufacturing Pathways: A Review. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b01839] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Emily D. E. R. Hyde
- School of Engineering, and ‡School of Environmental
and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Ahmad Seyfaee
- School of Engineering, and ‡School of Environmental
and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Frances Neville
- School of Engineering, and ‡School of Environmental
and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Roberto Moreno-Atanasio
- School of Engineering, and ‡School of Environmental
and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
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Ismail LFM, Emara MM, El-Moselhy MM, Maziad NA, Hussein OK. Silica coating and photocatalytic activities of ZnO nanoparticles: effect of operational parameters and kinetic study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 131:158-168. [PMID: 24830629 DOI: 10.1016/j.saa.2014.03.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 03/13/2014] [Accepted: 03/20/2014] [Indexed: 06/03/2023]
Abstract
Silica-coating ZnO nanoparticles were prepared using the hydrothermal method. The prepared nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray Spectroscopy (EDX). It was found that ultrafine core/shell structured silica-coating ZnO nanoparticles were successfully obtained. TEM analysis revealed a continuous and uniform silica coating layer of about 8nm in thickness on the surface of ZnO nanoparticles. The photocatalytic performance of silica-coating ZnO core/shell nanoparticles in methylene blue aqueous solution was investigated. The effects of some operational parameters such as pH value, nanocatalyst loading and initial MB concentration on the degradation efficiency were discussed. Kinetic parameters were experimentally determined and a pseudo-first-order kinetic was observed. Thus, the main advantage of the coating is the stability of the photocatalysts and the better performance in acidic or alkaline solutions. Compared to ZnO the maximum apparent rate constant is obtained at pH 8.5 (pH 11.5 in case of bare ZnO). Moreover, the Langmuir adsorption model was applied to describe the equilibrium isotherm at different MB concentration. The applicability of the Langmuir isotherm suggests monolayer coverage of the MB onto surface of silica-coating ZnO nanoparticles. The kinetics of the adsorption with respect to the initial dye concentration, were also investigated. The pseudo-first-order and second-order kinetic models were used and the rate constants were evaluated. The kinetic studies revealed that the pseudo-second-order kinetic model better represented the adsorption kinetics, suggesting that the adsorption process may be chemisorption.
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Affiliation(s)
- L F M Ismail
- Al-Azhar University, Faculty of Science (Girls), Chemistry Department, Nasr City, Cairo, Egypt.
| | - M M Emara
- Al-Azhar University, Faculty of Science (Boys), Chemistry Department, Nasr City, Cairo, Egypt; Science Center for Detection and Remediation of Environmental Hazards (SCDREH), Al-Azhar University, Nasr City, Cairo, Egypt
| | - M M El-Moselhy
- Al-Azhar University, Faculty of Science (Boys), Chemistry Department, Nasr City, Cairo, Egypt; Science Center for Detection and Remediation of Environmental Hazards (SCDREH), Al-Azhar University, Nasr City, Cairo, Egypt
| | - N A Maziad
- National Center for Radiation Research and Technology, Naser City, Cairo, Egypt
| | - O K Hussein
- Science Center for Detection and Remediation of Environmental Hazards (SCDREH), Al-Azhar University, Nasr City, Cairo, Egypt
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Rueda M, Sanz-Moral LM, Nieto-Márquez A, Longone P, Mattea F, Martín Á. Production of silica aerogel microparticles loaded with ammonia borane by batch and semicontinuous supercritical drying techniques. J Supercrit Fluids 2014. [DOI: 10.1016/j.supflu.2014.06.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Purcar V, Cinteza O, Donescu D, Bala D, Ghiurea M, Petcu C, Caprarescu S. Surface modification of silica particles assisted by CO2. J Supercrit Fluids 2014. [DOI: 10.1016/j.supflu.2013.12.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Yu Y, Zhang MZ, Chen J, Zhao YD. Homogeneous synthesis of SiO2@TiO2nanocomposites with controllable shell thickness and their enhanced photocatalytic activity. Dalton Trans 2013. [DOI: 10.1039/c2dt32024j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sadek OM, Reda SM, Al-Bilali RK. Preparation and Characterization of Silica and Clay-Silica Core-Shell Nanoparticles Using Sol-Gel Method. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/anp.2013.22025] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Sui R, Charpentier P. Synthesis of metal oxide nanostructures by direct sol-gel chemistry in supercritical fluids. Chem Rev 2012; 112:3057-82. [PMID: 22394213 DOI: 10.1021/cr2000465] [Citation(s) in RCA: 217] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Ruohong Sui
- Alberta Sulphur Research Ltd., University of Calgary, Calgary, Alberta, Canada
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Zhang J, Grabstanowicz LR, Gao S, Hosmane NS, Huang B, Dai Y, Liu DJ, Xu T. Visible-light photocatalytic SiO2/TiO2−xCx/C nanoporous composites using TiCl4as the precursor for TiO2and polyhydroxyl tannin as the carbon source. Catal Sci Technol 2012. [DOI: 10.1039/c1cy00403d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Machmudah S, Wahyudiono, Kuwahara Y, Sasaki M, Goto M. Nano-structured particles production using pulsed laser ablation of gold plate in supercritical CO2. J Supercrit Fluids 2011. [DOI: 10.1016/j.supflu.2011.04.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Myakonkaya O, Hu Z, Nazar MF, Eastoe J. Recycling functional colloids and nanoparticles. Chemistry 2010; 16:11784-90. [PMID: 20827694 DOI: 10.1002/chem.201000942] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The stability and separation of colloids and nanoparticles has been addressed in numerous studies. Most of the work reported to date requires high cost, energy intensive approaches such as ultracentrifugation and solvent evaporation to recover the particles. At this point of time, when green science is beginning to make a real impact, it is vital to achieve efficient and effective separation and recovery of colloids to provide environmental and economic benefits. This article explores recent advances in strategies for recycling and reusing functional nanomaterials, which indicate new directions in lean engineering of high-value nanoparticles, such as Au and Pd.
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Reverchon E, Della Porta G, Torino E. Production of metal oxide nanoparticles by supercritical emulsion reaction. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2009.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Zhang J, Han B. Supercritical CO2-continuous microemulsions and compressed CO2-expanded reverse microemulsions. J Supercrit Fluids 2009. [DOI: 10.1016/j.supflu.2008.08.014] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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