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Functionalization of Shirasu-balloons Surface for Removal of Cadmium Ions from Contaminated Soil

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Title: Functionalization of Shirasu-balloons Surface for Removal of Cadmium Ions from Contaminated Soil
Authors: Mihara, Yoshihiro Browse this author →KAKEN DB
Zhang, Sijing Browse this author
Syahputra, Rudy Browse this author
Akemoto, Yasuhiro Browse this author
Itoh, Shinji Browse this author
Tanaka, Shunitz Browse this author →KAKEN DB
Keywords: Shirasu-balloons
surface modification
cadmium ion
adsorption
remediation
Issue Date: 10-May-2020
Publisher: 日本分析化学会(Japan Society for Analytical Chemistry)
Journal Title: Analytical sciences
Volume: 36
Issue: 5
Start Page: 553
End Page: 560
Publisher DOI: 10.2116/analsci.19SBP06
Abstract: Microspheres of aluminosilicate glass from volcanic sediment, whose surfaces were modified with functional groups, Shirasu-balloons (SB), were investigated as an adsorbent to remove cadmium ions from contaminated soil. The introduction of thiol groups (-SH) on the surface of SB enabled it to adsorb cadmium ions. Meanwhile, the introduction of an alkyl group (-ODS) made the surface of SB hydrophobic, and consequently increased the mechanical strength of SB. Those adsorbents could float up on the water surface after the adsorption process. The prepared adsorbent was characterized by FTIR spectrophotometry, elemental analysis and optical microscopy for making photographic images. The adsorption of cadmium ions on the adsorbent was investigated by comparing the results by a plain SB with those by thiol-functionalized SB. The adsorption maximum for cadmium ions was 3.75 mg/g for SH-SB and 2.62 mg/g for SH-ODS-SB, respectively. The adsorption of cadmium ions on functionalized SH-SB and SH-ODS-SB fitted well to the Langmuir isotherm equation. After a shaking time of 24 h, the recovering ratios of the absorbents from soil were 73 wt% for SH-SB and 98 wt% for SH-ODS-SB absorbents. In addition, the kinetic and adsorption-desorption properties of the adsorbent were also considered.
Type: article
URI: http://hdl.handle.net/2115/79015
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)

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