Functionalization of Shirasu-balloons Surface for Removal of Cadmium Ions from Contaminated Soil
Functionalization of Shirasu-balloons Surface for Removal of Cadmium Ions from Contaminated Soil
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DOI：
10.2116/analsci.19sbp06
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发表时间：
2020-03
影响因子：
1.6
通讯作者：
Yoshihiro Mihara;Sijing Zhang;R. Syahputra;Yasuhiro Akemoto;S. Itoh;Shunitz Tanaka
中科院分区：
文献类型：
--
作者：
Yoshihiro Mihara;Sijing Zhang;R. Syahputra;Yasuhiro Akemoto;S. Itoh;Shunitz Tanaka
以火山沉积物中的铝硅酸盐玻璃微球为吸附剂，对其表面进行功能基团修饰，研究了其对镉离子的吸附性能。巯基（-SH）在SB表面的引入使其能够吸附镉离子。同时，烷基（-ODS）的引入使SB表面具有疏水性，从而提高了SB的机械强度，吸附剂在吸附过程后可以浮在水面上。用红外光谱、元素分析和光学显微镜对吸附剂进行了表征。巯基化SB和普通SB对镉离子的最大吸附量分别为3.75 mg/g和2.62 mg/g。功能化SH-SB和SH-ODS-SB对镉离子的吸附符合Langmuir吸附等温式。振荡24 h后，SH-SB和SH-ODS-SB吸附剂从土壤中的回收率分别为73wt%和98wt%。此外，还考虑了吸附剂的动力学和吸附-脱附性能。
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.