Orthotrichum truncatum Lewinsky &amp; Deguchi, sp. nov. from Chile, and a New Record for O. macrosporum Lewinsky

Lewinsky, Jette; Deguchi, Hiroyuki

doi:10.2307/3243948

Cited by 8 publications

(3 citation statements)

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“…The peak corresponding to the interplanar distance d(0.001) is 1.297 nm for the CVL sample and 1.253 nm for the clay after adsorption (CVL+CAF). These values are close to the 1.5 nm expected for a bentonite clay, and those identified experimentally for montmorillonites. , The 0.477 and 0.334 nm peaks, identified for the two clays, happens due the presence of quartz in the material composition. , The peaks of 0.994 nm and those close to 0.25 nm were also identified for the CVL in previous studies. ,, …”

Section: Resultssupporting

confidence: 88%

Fixed-Bed Adsorption of Caffeine onto Thermally Modified Verde-lodo Bentonite

Oliveira

Souza

Silva

et al. 2018

Ind. Eng. Chem. Res.

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Only a few studies regarding the adsorption of caffeine have been published in the past years, and none of them has evaluated the fixed-bed adsorption of a pharmaceutical using bentonite. This work evaluated caffeine adsorption using the thermally modified bentonite Verde-lodo as adsorbent. The effects of flow operating rate and inlet caffeine concentration have been investigated through breakthrough curves. Mass transfer and efficiency parameters were calculated for each operating condition. The results obtained at 1 mL•min −1 and 0.2 mmol• L −1 showed a breakthrough time of over 150 h and a removal percentage of approximately 100% until breakthrough. The highest breakthrough and saturation adsorption capacities were 0.122 and 0.219 mmol•g −1 , respectively, for the operating condition of 1 mL•min −1 and 1.0 mmol• L −1 . The breakthrough curves were remarkably described (R 2 > 0.975) by Thomas, Yoon, and Nelson, and modified dose− response models. Moreover, thermal, X-ray diffraction, Fourier transformed infrared spectroscopy, and scanning electron microscopy analyses were performed in order to compare the calcined Verde-lodo clay before and after caffeine adsorption, and they indicated the presence of the compound in the adsorbent.

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Section: Resultssupporting

confidence: 88%

Fixed-Bed Adsorption of Caffeine onto Thermally Modified Verde-lodo Bentonite

Oliveira

Souza

Silva

et al. 2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…These are different well-known models used to explain the results of adsorption studies. These models are based on almost similar principle with little difference in their approaches. − The kinetic study is carried out by calculating enthalpy, free energy, entropy, and energy of activation. The adsorption technology is developed by batch process followed by the column studies.…”

Section: Adsorptionmentioning

confidence: 99%

New Generation Adsorbents for Water Treatment

2012

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“…Bentonite clay consisting mostly of montmorillonite, which belongs to the smectite group, has been expected to be a valuable material in a variety of applications in the environmental, energy, agricultural, and manufacturing fields, for example, immobilization of toxic and hazardous heavy metals from wastewater, petroleum recovery, food additives, functional catalysis, cosmetics, pharmaceuticals, and so on. − Especially, utilization of bentonite clay in geological disposal of high-level radioactive wastes (HLWs) has become a critical issue. In the disposal concept, a multibarrier system, using engineered barriers typically composed of clay buffer, vitrified glass, canister, and overpack and natural barriers such as the surrounding host rocks, is a well-established solution for isolating HLWs from the biosphere. − The clay buffer plays an indispensable role in reducing environmental and biological impacts and in ensuring the long-term safety of the multibarrier system as it enables the prevention and retardation of the migration of radionuclides from vitrified glasses into underground environments.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cations on Interlayer Water Dynamics in Cation-Exchanged Montmorillonites Studied by Nuclear Magnetic Resonance and X-ray Diffraction Techniques

Rongwei

Tsukahara

2020

ACS Earth Space Chem.

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To ensure the safety of geological disposal of radioactive wastes, understanding the migration behavior of radioactive species in montmorillonite clays has become increasingly important. However, there are still many indeterminate aspects about the influence of cation species and humidity on the interlayer water dynamics and swelling properties of montmorillonite clays. In this work, by using X-ray diffraction (XRD) and proton nuclear magnetic resonance spin–lattice relaxation rate (1/T 1) techniques, we aimed to clarify the relation between water layer thickness and molecular dynamics in various cation-exchanged montmorillonites (M n+-MMTs; M n+ = Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+, La3+, Sm3+, and Lu3+) in the temperature range of −40 to 50 °C. XRD measurements showed that layer thickness in M n+-MMTs increased with increasing hydrated water according to the order of structure-breaking chaotropic K+, Rb+, and Cs+ ions, structure-making kosmotropic and borderline Li+, Na+, and Ba2+ ions, divalent ions, and trivalent lanthanide ions. It was found that the 1/T 1 values are linearly correlated with d 001 basal spacing and increase in the interlayer thickness induces acceleration of the motion of the interlayer water molecules. The temperature dependence of the 1/T 1 values verified that interparticle water and interlayer water, regardless of whether it was frozen or unfrozen, coexist above approximately −5 °C, but only unfrozen interlayer water with poor hydrogen bonding rearrangement properties exists below −5 °C. Moreover, the T 1-distribution results suggest that motions of the water molecules in the M n+-MMTs can be uniquely characterized by a value of about 0.2 ms under supercooled environments because of dominant water–surface interactions.

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Orthotrichum truncatum Lewinsky & Deguchi, sp. nov. from Chile, and a New Record for O. macrosporum Lewinsky

Cited by 8 publications

References 0 publications

Fixed-Bed Adsorption of Caffeine onto Thermally Modified Verde-lodo Bentonite

Fixed-Bed Adsorption of Caffeine onto Thermally Modified Verde-lodo Bentonite

New Generation Adsorbents for Water Treatment

Effect of Cations on Interlayer Water Dynamics in Cation-Exchanged Montmorillonites Studied by Nuclear Magnetic Resonance and X-ray Diffraction Techniques

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