Superwetting metal-organic frameworks optimized interface for high-performance hydrogen-water isotopic exchange for tritiated water treatment

Ding, Weihua; Fu, Xiaolong; Hou, Jingwei; Wang, Junyan; Yang, Mao; Gong, Yu; Xiao, Chengjian; Huang, Hongwen; Wang, Heyi

doi:10.1016/j.ijhydene.2023.05.240

Cited by 2 publications

(2 citation statements)

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“…In a seminal work by Nakamura et al, they reported the first ideas by contacting tritiated water with an HFC-134a + D 2 O hydrate substrate, which reduced the tritium concentration in tritium-containing water from 4.77 × 10 5 Bq/kg to 1.55 × 10 3 Bq/kg. Their work reported that the hydrate-based process achieves ultralow tritium concentrations in the order of 10 3 Bq/kg, which any well-established separation method such as cryogenic distillation and catalytic exchange has not reached.…”

Section: Introductionmentioning

confidence: 99%

“…Nakamura et al, 17 they reported the first ideas by contacting tritiated water with an HFC-134a + D 2 O hydrate substrate, which reduced the tritium concentration in tritium-containing water from 4.77 × 10 5 Bq/kg to 1.55 × 10 3 Bq/kg. Their work reported that the hydrate-based process achieves ultralow tritium concentrations in the order of 10 3 Bq/kg, which any well-established separation method such as cryogenic distillation 18 and catalytic exchange 19 has not reached. In the hydrate-based process, tritium is concentrated on the surface of the D 2 O hydrate substrate because of the coprecipitation reaction of T 2 O and D 2 O; 17 therefore, the dynamic characteristics of D 2 O-based hydrate with various guest compounds, regardless of HFCs or other greener guests, need to be clarified to develop an efficient process for substrate formation.…”

Section: Introductionmentioning

confidence: 99%

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Crystal Growth of Clathrate Hydrate Formed with Carbon Dioxide and Deuterium Oxide: Implications for Hydrate-based Tritium Separation

Maruyama,

Dogi,

Ohmura

2024

Energy Fuels

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Tritium separation technology is a key method for treating contaminated water from nuclear power plants. Recently, a novel tritium separation method using deuterium oxide (D 2 O)based clathrate hydrate has attracted attention because it can reduce the tritium concentration in contaminated water from 4.77 × 10 5 Bq/kg to 1.55 × 10 3 Bq/kg. In this hydrate-based tritium separation method, tritium is concentrated on the surface of a D 2 O-based hydrate substrate. The mechanistic characteristics and formation kinetics of D 2 O-based hydrates need to be clarified to develop an efficient process for substrate formation. This study contributes to the process design by revealing the crystal growth of the CO 2 + D 2 O hydrate. The crystal growth behavior of the hydrate formed in the CO 2 + D 2 O system was experimentally observed under different subcooling temperatures (ΔT sub ) at 3.0 MPa. At all ΔT sub , hydrate crystals were formed at the gas−liquid interface and extended along the interface. After the interface was covered, hydrate crystals grew in the liquid phase. The variation in the morphology of CO 2 + D 2 O hydrate depended on ΔT sub . At ΔT sub = 1.6 K, polygonal crystals with side lengths of 0.2−0.6 mm were formed. At ΔT sub = 2.7 K, columnar crystals with a length of 1−2 mm were formed. At ΔT sub ≥ 3.3 K, dendritic crystals were formed. With an increase in ΔT sub , the size of the dendritic branches increased. The crystal growth dynamics and morphological tendency of the CO 2 + D 2 O hydrate were comparable to those of the CO 2 + H 2 O hydrate at fixed ΔT sub . Detailed theoretical discussions on the obtained results of surface kinetics, mass transfer, and heat transfer during hydrate formation from H 2 O and D 2 O were provided, considering the chemical potential, viscosity, and heat transfer of the liquids.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystal Growth of Clathrate Hydrate Formed with Carbon Dioxide and Deuterium Oxide: Implications for Hydrate-based Tritium Separation

Maruyama,

Dogi,

Ohmura

2024

Energy Fuels

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Efficient Separation of Tritiated Water from Light Water Based on Membrane Distillation by Gas–Liquid Exchange

Miyoshi,

Fujiwara

2024

ACS Sustainable Resour. Manage.

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The removal of tritiated water (HTO) from "ALPStreated water" originating from the disabled Fukushima Daiichi Nuclear Power Plant (FDNPP) is an important environmental issue. In this paper, we report a new method of separating HTO from light water (H 2 O) based on membrane distillation by gas− liquid exchange. HTO-containing water loaded on a hydrophobic membrane modified with a photothermal black dye was exposed to artificial sunlight. The heat generated from the dye upon sunlight exposure vaporized the water, with the HTO-containing water vapor penetrating through the membrane. The permeated HTOcontaining water vapor was mixed with H 2 O added to hydrophilic filters under the membrane. Gas−liquid exchange occurred in these filters and significantly decreased the percentage of HTO in the water collected under all filters. The increases in both the filter number and H 2 O content in the hydrophilic filters increased the efficiency of HTO separation. When four hydrophilic filters containing H 2 O and four hydrophobic filters were set alternately, the ratio of HTO collected under these filters decreased to 12 ± 0.3%. This process was also effective for the removal of 137 Cs from 137 Cs-containing water.

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Superwetting metal-organic frameworks optimized interface for high-performance hydrogen-water isotopic exchange for tritiated water treatment

Cited by 2 publications

References 58 publications

Crystal Growth of Clathrate Hydrate Formed with Carbon Dioxide and Deuterium Oxide: Implications for Hydrate-based Tritium Separation

Crystal Growth of Clathrate Hydrate Formed with Carbon Dioxide and Deuterium Oxide: Implications for Hydrate-based Tritium Separation

Efficient Separation of Tritiated Water from Light Water Based on Membrane Distillation by Gas–Liquid Exchange

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