Hydrothermal modification and characterization of bentonite for reactive adsorption of methylene blue: An ESI-MS study

被引：33
作者：
Gupta, Vijendra Kumar [1 ]
Sharma, Manisha [1 ]
Vyas, Raj K. [1 ]
机构：
[1] Malaviya Natl Inst Technol Jaipur, Dept Chem Engn, JLN Marg, Jaipur 302017, Rajasthan, India
来源：
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2015年 / 3卷 / 03期
关键词：
Bentonite; Methylene blue (MB); Reactive adsorption; ESI-MS;
D O I：
10.1016/j.jece.2015.07.022
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Reactive adsorption of methylene blue (MB), a cationic dye, using pretreated (hydrothermally modified) bentonite clay was investigated. The modified clay showed high efficacy for MB removal via, reactive adsorption, which is supported by electrospray ionization mass spectrometry (ESI-MS) study. The modified clay was characterized by Fourier transform infra-red spectroscopy (FTIR), field emission scanning electron microscopy coupled with energy dispersive spectroscopy (FE-SEM with EDS), transmission electron microscopy (TEM) and BET surface area analysis. The results indicated that the crystalline structure of raw bentonite upon hydrothermal treatment transformed into amorphous nature. Pretreatment increased the concentration of OH surface functional groups pointing toward increased reactive behavior. Pretreated bentonite completely removed the MB dye rendering the solution colorless. Furthermore, ESI-MS analysis showed reactive degradation of MB molecule by oxidation via hydroxylation of reaction intermediates. The degradation products of MB were found environmentally benign. (C) 2015 Elsevier Ltd. All rights reserved.
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收藏
页码：2172 / 2179
页数：8
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