Can nitrogen-based complex hydrides be a hydrogen isotope separation material?

2021 ◽  
Vol 57 (78) ◽  
pp. 10063-10066
Author(s):  
Zhao Zhang ◽  
Hujun Cao ◽  
Zhitao Xiong ◽  
Joshua Adedeji Bolarin ◽  
Weijin Zhang ◽  
...  
Keyword(s):  
Separation Factor ◽  
Hydrogen Isotope ◽  
Isotope Effects ◽  
Isotope Separation ◽  
Complex Hydride ◽  
Complex Hydrides

The nitrogen-based complex hydride Li–N–H has positive thermodynamic isotope effects with a separation factor of 1.42.

Study of separation factor and product extraction ratio in hydrogen isotope separation with displacement chromatography

2021 ◽  
Vol 165 ◽  
pp. 112246
Author(s):  
Yuting Liu ◽  
Wenqing Wu ◽  
Guanghui Zhang ◽  
Manquan Fang ◽  
Wenyong Jing ◽  
...  
Keyword(s):  
Separation Factor ◽  
Hydrogen Isotope ◽  
Isotope Separation ◽  
Extraction Ratio ◽  
Displacement Chromatography

scholarly journals Unravelling the process of petroleum hydrocarbon biodegradation in different filter materials of constructed wetlands by stable isotope fractionation and labelling studies

2021 ◽  
Author(s):  
Andrea Watzinger ◽  
Melanie Hager ◽  
Thomas Reichenauer ◽  
Gerhard Soja ◽  
Paul Kinner
Keyword(s):  
Stable Isotope ◽  
Constructed Wetlands ◽  
Hydrogen Isotope ◽  
Petroleum Hydrocarbon ◽  
Isotope Fractionation ◽  
Isotope Effects ◽  
Filter Material ◽  
Hydrocarbon Biodegradation ◽  
Stable Isotope Fractionation ◽  
Filter Materials

AbstractMaintaining and supporting complete biodegradation during remediation of petroleum hydrocarbon contaminated groundwater in constructed wetlands is vital for the final destruction and removal of contaminants. We aimed to compare and gain insight into biodegradation and explore possible limitations in different filter materials (sand, sand amended with biochar, expanded clay). These filters were collected from constructed wetlands after two years of operation and batch experiments were conducted using two stable isotope techniques; (i) carbon isotope labelling of hexadecane and (ii) hydrogen isotope fractionation of decane. Both hydrocarbon compounds hexadecane and decane were biodegraded. The mineralization rate of hexadecane was higher in the sandy filter material (3.6 µg CO2 g−1 day−1) than in the expanded clay (1.0 µg CO2 g−1 day−1). The microbial community of the constructed wetland microcosms was dominated by Gram negative bacteria and fungi and was specific for the different filter materials while hexadecane was primarily anabolized by bacteria. Adsorption / desorption of petroleum hydrocarbons in expanded clay was observed, which might not hinder but delay biodegradation. Very few cases of hydrogen isotope fractionation were recorded in expanded clay and sand & biochar filters during decane biodegradation. In sand filters, decane was biodegraded more slowly and hydrogen isotope fractionation was visible. Still, the range of observed apparent kinetic hydrogen isotope effects (AKIEH = 1.072–1.500) and apparent decane biodegradation rates (k = − 0.017 to − 0.067 day−1) of the sand filter were low. To conclude, low biodegradation rates, small hydrogen isotope fractionation, zero order mineralization kinetics and lack of microbial biomass growth indicated that mass transfer controlled biodegradation.

scholarly journals Metal–organic frameworks (MOFs) as highly efficient agents for boron removal and boron isotope separation

RSC Advances ◽  
2017 ◽  
Vol 7 (26) ◽  
pp. 16022-16026 ◽  
Author(s):  
Jiafei Lyu ◽  
Hongxu Liu ◽  
Jingshuang Zhang ◽  
Zhouliangzi Zeng ◽  
Peng Bai ◽  
...  
Keyword(s):  
Separation Factor ◽  
Isotope Separation ◽  
Metal Organic Frameworks ◽  
Boron Isotope ◽  
Boron Removal ◽  
Boron Uptake ◽  
Highly Efficient ◽  
Metal Organic ◽  
High Boron

A variety of MOFs were observed with ZIF-8, to our knowledge, showing the highest boron uptake and MIL-101(Cr) with an unprecedentedly high boron isotope separation factor.

Hydrogen Isotope Separation by Bipolar Electrolysis with Countercurrent Electrolyte Flow

1980 ◽  
Vol 15 (3) ◽  
pp. 405-421 ◽  
Author(s):  
D. W. Ramey ◽  
M. Petek ◽  
R. D. Taylor ◽  
P. W. Fisher ◽  
E. H. Kobisk ◽  
...  
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Separation ◽  
Electrolyte Flow
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