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Chitosan-functionalized natural magnetic particle@silica modified with (3-chloropropyl)trimethoxysilane as a highly stable magnetic adsorbent for gold(III) ion

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Title: Chitosan-functionalized natural magnetic particle@silica modified with (3-chloropropyl)trimethoxysilane as a highly stable magnetic adsorbent for gold(III) ion
Authors: Nuryono, Nuryono Browse this author
Miswanda, Dikki Browse this author
Sakti, Satya Candra Wibawa Browse this author
Rusdiarso, Bambang Browse this author
Krisbiantoro, Philip Anggo Browse this author
Utami, Nastiti Browse this author
Otomo, Ryoichi Browse this author →KAKEN DB
Kamiya, Yuichi Browse this author →KAKEN DB
Keywords: Natural magnetic particle
Chitosan modification
Sol-gel process
Gold ion adsorption
Issue Date: 15-Nov-2020
Publisher: Elsevier
Journal Title: Materials Chemistry and Physics
Volume: 255
Start Page: 123507
Publisher DOI: 10.1016/j.matchemphys.2020.123507
Abstract: It is keenly desired to develop an environmentally benign and highly stable magnetic adsorbent for efficient recovery of Au(III) ion from an acidic solution. In the present study, we investigated the synthesis of magnetic adsorbents that the magnetic particles, which was prepared from natural iron sand, were modified with silica layer on which chitosan was fixed through 3-chloropropyltrymethoxysilane (CPTMS) by a sol-gel process. Since the magnetic particles were almost completely covered with the silica layer and chitosan was tightly fixed on it through CPTMS, the adsorbent was highly stable in an acidic solution with pH 3 or lower. Excess CPTMS significantly lowered the adsorption capacity for Au(III) ion, while lead to little improvement in the stability. Thus, 1 mmol of CPTMS against 4 mmol of chitosan gave the best magnetic adsorbent in terms of stability and adsorption capacity, of which the maximum was 112 mg g(-1) for Au(III) ion at pH 5. The adsorbent showed high selectivity of Au(III) adsorption in the solution containing Cu(II) and Zn(II), and was reusable for two times keeping high selectivity without fatal decline in the adsorption performance. The magnetic adsorbent was separable from the solution simply with an external magnet, while the modification caused a slight decrease of the saturated magnetization.
Rights: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 神谷 裕一

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