Removal of Cs+ from water and soil by ammonium-pillared montmorillonite/Fe3O4 composite

Zheng, Xianming; Dou, Junfeng; Yuan, Jing; Qin, Wei; Hong, Xiaoxi; Ding, Aizhong

doi:10.1016/j.jes.2016.08.019

Cited by 76 publications

(31 citation statements)

References 35 publications

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“…vibration, respectively [14,34]. The characteristic peak of the Mt was exhibited at 3617 cm −1 , which is known as the O-H stretching vibration of Al-OH and Si-OH [35]. The peaks at 3400 and 1633 cm −1 could be ascribed to the O-H stretching and bending vibrations, respectively [36].…”

Section: Ftir Analysis Of Pl-mtmentioning

confidence: 97%

“…As illustrated in Figure 2a, the typical FTIR spectra of the ε-PL absorbance was observed at 3218, 2932, 2863, 1660, 1557 and 1250 cm −1 , which could be attributed to the NH 2 symmetric stretching vibration, antisymmetric and symmetric stretching vibration of methylene (-CH 2 -), C=O stretching vibration (amide I), N-H bending (amide II) and C-N stretching vibration, respectively [14,34]. The characteristic peak of the Mt was exhibited at 3617 cm −1 , which is known as the O-H stretching vibration of Al-OH and Si-OH [35]. The peaks at 3400 and 1633 cm −1 could be ascribed to the O-H stretching and bending vibrations, respectively [36].…”

Section: Ftir Analysis Of Pl-mtmentioning

confidence: 98%

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Ultrasound-Assisted Preparation, Characterization, and Antibacterial Activity of Montmorillonite Modified by ε-Polylysine Hydrochloride

Yuan

Zhang

et al. 2019

Materials

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In this study, two types of antibacterial montmorillonites (Mt) were prepared using a facile method. The Mt modified with ε-polylysine hydrochloride (ε-PL) was named PL-Mt, while the Mt dually modified with dioctadecyl dimethylammonium chloride (D1821) and ε-PL was named PL-OMt. The results of the X-ray diffraction, Fourier-transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) of the PL-Mt indicated that 30% ε-PL was the most suitable amount for intercalating the Mt. The particle size and distribution of the ε-PL in the solution demonstrated that the Mt d-value could not be further increased owing to the increasing ε-PL diameter. The result of the X-ray diffraction of PL-OMt displayed that ultrasonic treatment at 600 W facilitated ε-PL to intercalate into the OMt interlayer space. The PL-OMt prepared with ultrasonic treatment at 600 W exhibited antibacterial activity against Escherichia coli and Bacillus subtilis superior to that of the PL-OMt prepared with higher-power ultrasonic treatment. Thus, the addition of 30% ε-PL based on the dry Mt mass is the most suitable ratio for preparing PL-Mt, while ultrasonic treatment at 600 W is the most suitable for preparing PL-OMt. These findings may expand the application fields of ε-PL.

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Section: Ftir Analysis Of Pl-mtmentioning

confidence: 97%

Section: Ftir Analysis Of Pl-mtmentioning

confidence: 98%

Ultrasound-Assisted Preparation, Characterization, and Antibacterial Activity of Montmorillonite Modified by ε-Polylysine Hydrochloride

Yuan

Zhang

et al. 2019

Materials

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“…Effect of temperature on Cs adsorption is shown inFigure 15, which shows that Cs + sorption capacity was decreased with increasing temperatures. Zheng et al(63) observed the same situation, since the temperature increased, Cs uptake on unmodified montmorillonite diminished. Also, Kim et al(2) reported that Cs sorption gradually decreased with higher temperatures using raw sericite mineral.…”

mentioning

confidence: 63%

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

Akalın¹,

Hiçsönmez²,

Yılmaz³

2017

Journal of the Turkish Chemical Society, Section A: Chemistry

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In this study, cesium adsorption performance of raw vermiculite obtained from Sivas-Yıldızeli region of Turkey was investigated using batch adsorption method. In order to obtain the optimum adsorption conditions; different adsorbent dosages, contact times, solution pH's, initial cesium concentrations and temperature ranges were investigated. The concentration of cesium in solution was determined by ICP-OES. Kinetic studies demonstrated that adsorption process was in accordance with pseudo-second order kinetic model and equilibrium isotherm modeling studies showed that the process was compatible with Langmuir, Freundlich and Temkin adsorption isotherm models, indicating that Cs adsorption process had both physical and chemical character. Negative Gibbs energy values obtained from thermodynamic studies revealed that the adsorption process was spontaneous and had a high feasibility. Additionally, the negative enthalpy value indicated that process was exothermic, suggesting that the adsorbed Cs + ions decreased with increasing reaction temperatures. Positive entropy value showed that disorderliness between solid-liquid phase increased during adsorption. Results clearly indicate that vermiculite mineral has a promising potential in removing Cs + ions from aqueous media which leads mineral may also be used in decomposing and efficiently removing radioactive cesium from contaminated waters.

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“…al., 1985;Lützenkirchen and Behra, 1995). On the other hand, when Na + was introduced to the solution, the selectivity adsorption of sorbent (calcium silicate) occurred between Na + and Cs + (Zheng et al, 2017;Alamudy and Cho, 2018;Xia et al, 2018) which in turn could decrease the activity of Cs + and available adsorption sites. This can be deduced on the results where surface precipitation was hindered, and the adsorption capacity was reduced from 0.061 mmol/g to 0.047 mmol/g.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Room-temperature adsorption behavior of cesium onto calcium silicate insulation

Rizaal

Saito

Okamoto

et al. 2020

Mechanical Engineering Journal

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Room-temperature adsorption behavior of cesium onto calcium silicate insulation Abstract A calcium silicate insulator material was investigated for its interaction with non-radioactive cesium at room temperature by batch-type adsorption experiments. An industrial-grade calcium silicate was weighted and ground into powder with an average size of 15.4 ± 0.1 µm, which was then placed into polypropylene (PP) tube containing cesium chloride aqueous solution. Cesium concentrations were range between 1.3×10 -6 -3.5×10 -3 M. Adsorption kinetics of cesium was evaluated based on pseudo-first order and pseudo-second order models, while the adsorption isotherm was modeled using the Langmuir model and modified BET model. Physicochemical properties of calcium silicate before and after the adsorption was investigated using XRD, SEM/EDS and FT-IR. Chemisorption was found as the underlying sorption process between calcium silicate insulator material and cesium.

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Removal of Cs+ from water and soil by ammonium-pillared montmorillonite/Fe3O4 composite

Cited by 76 publications

References 35 publications

Ultrasound-Assisted Preparation, Characterization, and Antibacterial Activity of Montmorillonite Modified by ε-Polylysine Hydrochloride

Ultrasound-Assisted Preparation, Characterization, and Antibacterial Activity of Montmorillonite Modified by ε-Polylysine Hydrochloride

Removal of Cesium From Aqueous Solution by Adsorption Onto Si̇vas-Yildizeli̇ (Turki̇ye) Vermiculite: Equilibrium, Kinetic and Thermodynamic Studies

Room-temperature adsorption behavior of cesium onto calcium silicate insulation

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