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Molybdenum Adsorption Properties of Alumina-Embedded Mesoporous Silica for Medical Radioisotope Production

Article - 2018, Vol.91, No.2

195-200

Molybdenum Adsorption Properties of Alumina-Embedded Mesoporous Silica for Medical Radioisotope Production

Indra Saptiama ,¹^,²Yusuf Valentino Kaneti ,^*¹Hamid Oveisi ,¹^,³Yoshitaka Suzuki ,⁴Kunihiko Tsuchiya ,⁴Kimiko Takai ,¹Takeji Sakae ,²Subrata Pradhan ,⁵Md. Shahriar A. Hossain ,¹^,⁶Nobuyoshi Fukumitsu ,⁷Katsuhiko Ariga ,¹^,⁸ and Yusuke Yamauchi ^*⁶^,⁹^,¹⁰

¹International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044
²Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8576
³Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar 9617976487, Iran
⁴Japan Atomic Energy Agency (JAEA), 4002 Narita, Oarai, Higashi-Ibaraki, Ibaraki 311-1393
⁵Institute for Plasma Research, Gandhinagar 382 428, Gujarat, India
⁶Australian Institute for Innovative Materials (AIIM), University of Wollongong, Squires Way, North Wollongong, NSW 2500, Australia
⁷Department of Radiation Oncology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8576
⁸Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-0827
⁹School of Chemical Engineering & Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia
¹⁰Department of Plant & Environmental New Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, South Korea

https://doi.org/10.1246/bcsj.20170295

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Abstract

In this work, we have prepared alumina-embedded mesoporous silica and investigated their molybdenum (Mo) adsorption properties. To synthesize such materials, mesoporous silica particles were firstly synthesized via a soft-templated approach followed by the introduction of aluminium butoxide into the mesopores, which was converted into alumina by heat treatment at high temperatures. The obtained alumina-embedded mesoporous silica samples (Al_x-MPS) were characterized by low- and wide-angle X-ray diffractions, nitrogen adsorption-desorption isotherms, and transmission electron microscopy. The effects of Al/Si ratios and calcination temperature on their Mo adsorption properties were also carefully investigated by using the batch method. The experimental results showed the following trend in Mo adsorption capacity in relation to the calcination temperature: 750 °C > 600 °C > 900 °C > 1050 °C and Al/Si molar ratio: Al_0.1-MPS < Al_0.3-MPS < Al_0.5-MPS < Al_0.6-MPS.

We have fabricated alumina-embedded mesoporous silica and investigated the molybdenum (Mo) adsorption properties. To synthesize such materials, mesoporous silica particles were firstly synthesized via a solution-phase method followed by the introduction of aluminium n-butoxide into the mesopores, which was converted into alumina by heat treatment at high temperatures. The effects of Al/Si ratios and calcination temperature on their Mo adsorption properties were also carefully investigated by using the batch method.

bcsj 2018 - Vol.91 , No.2, pp. 147 - 152
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Daisuke Nagai, Hiroki Goto
A melamine cyanurate complex catalyst containing Pd(II) ions (denoted Pd/M-CA) was effective for Suzuki-Miyaura cross-coupling reactions in environmentally benign aqueous media at room temperature. The reaction conditions, such as the type of Pd species in Pd/M-CA, loading amounts of Pd, solvent, and substrate concentration, were investigated for optimization. In the presence of Pd/M-CA under the optimal conditions, cross-coupling reactions of a wide range of structurally diverse aryl halides and arylboronic acids containing functional groups proceeded smoothly to provide the corresponding products in high yields. In addition, the Pd/M-CA could be reused at least 5 times while maintaining high yields. The reduction of Pd(II) ions in Pd/M-CA to Pd(0) by NaBH₄ enhanced the catalytic activity to provide a high turnover number (TON) of 17600 and turnover frequency (TOF) of 880 h⁻¹.
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cl 2015 - Vol.44 , No.7, pp. 1004 - 1006
Facile Synthesis of Nanoporous Carbons with High Surface Area and Their CO2 Adsorption Properties
Takahito Mitome, Yoshiaki Uchida, Norikazu Nishiyama
New nanoporous carbons were prepared by carbonization of resorcinol–formaldehyde–Pluronic F127 composite in the presence of KOH. The obtained nanoporous carbon possesses 2.4-nm mesopores and high surface area of 3277 m² g⁻¹. The obtained nanoporous carbon showed a high CO₂ adsorption capacity of 6.2 mmol g⁻¹ at 273 K and 745 mmHg because of such high surface area and nanopores larger than 1 nm in size.
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bcsj 2017 - Vol.90 , No.10, pp. 1174 - 1179
Selected Paper
Mesoporous Alumina as an Effective Adsorbent for Molybdenum (Mo) toward Instant Production of Radioisotope for Medical Use
Indra Saptiama, Yusuf Valentino Kaneti, Yumi Suzuki, Yoshitaka Suzuki, Kunihiko Tsuchiya, Takeji Sakae, Kimiko Takai, Nobuyoshi Fukumitsu, Zeid Abdullah Alothman, Md. Shahriar A. Hossain, Katsuhiko Ariga, Yusuke Yamauchi
Mesoporous materials with high surface area and pore volume have attracted significant attention as adsorbents as they can provide extensive reaction sites for molybdenum (Mo) adsorption. In this study, we have prepared mesoporous alumina (MA) materials using a soft-templated approach. By changing the applied calcination temperatures, the mesostructural ordering, surface areas, and crystallinity of the MA materials can be varied. Furthermore, the effects of these parameters on their molybdenum (Mo) adsorption properties have been carefully investigated. The findings in this study will provide guidance for designing effective Mo adsorbents using mesoporous materials toward the next ⁹⁹Mo/^99mTc generator preparation.
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cl 2015 - Vol.44 , No.4, pp. 524 - 526
Editor’s ChoiceOpen Access
Kinetic Analysis of the Adsorption of Polar and Nonpolar Molecules onto Ordered Mesoporous Silica Using the Pressure-feedback Method
Hiromitsu Ito, Keisuke Asakura, Tomohiro Ogino, Taku Iiyama, Sumio Ozeki, Kazuyuki Nakai
The rate constants for the adsorption of water and nitrogen onto ordered mesoporous silica SBA-15 were determined at 298 and 77 K, respectively, using the novel pressure-feedback method (PFM) that measures the rate of adsorption directly. The rate constant for the adsorption of water is smaller than that of nitrogen, even though the adsorption of water was measured at a higher temperature (298 K) than that of nitrogen (77 K).
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cl 2014 - Vol.43 , No.7, pp. 1170 - 1172
Facile Preparation of Highly Ordered Small Pore Mesoporous Silicas
Yan-Mei Zhu, Ren-Liang Wang, Wen-Ping Zhang, Hai-Yan Ge, Li Li
Highly ordered small pore mesoporous silicas were synthesized by using a mixture of surfactants as a template. The surfactant system comprises short-chain cationic surfactant (decyltrimethylammonium bromide, denoted C₁₀TMAB) and sodium salicylate (sodium o-hydroxybenzoate, denoted SS). Addition of SS into a C₁₀TMAB system can effectively reduce the surfactant head-group repulsion by screening the electrostatic charge, optimizing the surfactant packing, thus facilitating the synthesis of highly ordered small pore mesoporous silicas.
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bcsj 2017 - Vol.90 , No.6, pp. 706 - 708
Short Article
Pore Clogging of Colloidal Mesoporous Silica Nanoparticles for Encapsulating Guest Species
Eisuke Yamamoto, Kouya Nagata, Kenta Onishi, Chihiro Urata, Atsushi Shimojima, Hiroaki Wada, Shinji Takeoka, Kazuyuki Kuroda
Colloidal mesoporous silica nanoparticles (CMS) are useful as carriers for imaging probes because of their unique features. A simple method for the pore clogging of CMS has been proved by the addition of tetraethoxysilane under weakly basic conditions. The pore clogging of CMS is useful for encapsulation of thermoresponsive dyes.
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cl 2012 - Vol.41 , No.11, pp. 1512 - 1514
Rapid and High-capacity Adsorption of Glucose Oxidase on Amine-functionalized Mesoporous Silica SBA-15 Platelets
Yi Ding, Guangfu Yin, Xiaoming Liao, Zhongbin Huang, Xianchun Chen, Yadong Yao
We have synthesized platelet-like SBA-15 particles and functionalized their surfaces with amine groups for use as adsorbent materials in glucose oxidase (GOD) adsorption. The amine-functionalized SBA-15 exhibits very rapid (<20 min to reach equilibrium) and high-capacity (up to 680 mg g⁻¹) adsorption of GOD. It is found that electrostatic interaction is the dominant driving force for GOD adsorption on these mesoporous materials.
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bcsj 2018 - Vol.91 , No.2, pp. 311 - 317
Selected Paper
Green Synthesis of Magnetite Nanostructures from Naturally Available Iron Sands via Sonochemical Method
Retno Rahmawati, Yusuf Valentino Kaneti, Ahmad Taufiq, Sunaryono, Brian Yuliarto, Suyatman, Nugraha, Deddy Kurniadi, Md. Shahriar A. Hossain, Yusuke Yamauchi
Herein, we report the green synthesis of magnetite (Fe₃O₄) nanostructures (including flower-like nanosheets and cube-like particles) with large surface areas ranging from 127 to 318 m² g⁻¹ from naturally available iron sands using a facile sonochemical method, with the assistance of polyethylene glycol (PEG 6000). The X-ray diffraction (XRD) results reveal that the Fe₃O₄ nanostructures obtained from these iron sands are of good purity and crystallinity and are polycrystalline with an inverse cubic spinel structure. The increased addition of PEG 6000 from 5 to 25% v/v is found to result in larger crystallite size and improved crystallinity. Furthermore, the Fe₃O₄ nanostructures synthesized by our proposed method have a tendency to form flower-like structures composed of thin nanosheets when the amount of PEG 6000 is low (5–10% v/v), although their morphology gradually changes to cube-like particles at 15% PEG, before finally being converted to spherical nanoparticles with relatively good dispersity at high PEG contents (above 15%). More importantly, the specific surface area of the obtained Fe₃O₄ nanostructures decreases with increased addition of PEG due to the increased agglomeration of the particles. The magnetic properties characterization of the as-prepared Fe₃O₄ samples via vibrating sample magnetometer revealed that they exhibit superparamagnetism at room temperature and that their saturation magnetization values are strongly affected by the crystallite size of the Fe₃O₄ phase as Fe₃O₄ nanoparticles with larger crystallite size exhibit higher saturation magnetization (M_s) values. The presented work may encourage the use of naturally available resources rather than laboratory-made chemical reagents for the synthesis of iron oxide and other metal oxide nanostructures in the future.
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