Modeling the Key Lake uranium mill's bulk neutralization process using a pilot-scale model

Robertson, Jared; Shacklock, Krysta; Frey, Ryan; Goméz, Mario A.; Essilfie-Dughan, Joseph; Hendry, M. Jim

doi:10.1016/j.hydromet.2014.08.010

Cited by 9 publications

(1 citation statement)

References 32 publications

(47 reference statements)

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“…Note that most often uranium containing solutions in the industry are often much more acidic with pH~1, and the optimal pH of 4 in this work is much higher than often found in the industry, thus, in practice this would cause the precipitation of other ions in solution such as Fe or Al phases. [25][26] The kinetics of adsorption can be well fitted by the pseudo-second-order rate equation ( Figure S7), implying a dominating chemical adsorption rather than physical adsorption. The sorption isotherms observed in this work, according to the Langmuir model ( Figure S8), indicate that the adsorption of U VI ions is localized in a monolayer.…”

Section: Resultsmentioning

confidence: 93%

Coumarin-modified microporous-mesoporous Zn-MOF-74 showing ultra-high uptake capacity and photo-switched storage/release of UVI ions

Zhang

Wang

Gong

et al. 2016

Journal of Hazardous Materials

126

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Driven by an energy crisis but consequently puzzled by various environmental problems, uranium, as the basic material of nuclear energy, is now receiving extensive attentions. In contrast to numerous sorbents applied in this field, metal-organic framework (MOFs), as a renovated material platform, has only recently been developed. How to improve the adsorption capacity of MOF materials towards U(VI) ions, as well as taking advantage of the nature of these MOFs to design photo-switched behaviour for photo-triggered storage/release of U(VI) ions are at present urgent problems and great challenges to be solved. Herein, we show a simple and facile method to target the goal. Through coordination-based post-synthetic strategy, microporous- mesoporous Zn-MOF-74 was easily functionalized by grafting coumarin on coordinatively unsaturated Zn(II) centers, yielding a series of coumarin-modified Zn-MOF-74 materials. The obtained samples displayed ultra-high adsorption capacity for U(VI) ions from water at pH value of 4 with maximum adsorption capacities as high as 360 mg/g (the record value in MOFs) and a remarkable photo-switched capability of 50 mg/g at pH value of 4. To the best of knowledge, and in contrast to the well-known photo-switched behaviour towards CO2, dye (propidium iodide), as well as fluorescence observed in MOFs, this is the first study that shows a photo-switched behaviour towards radioactive U(VI) ions in aqueous solution.

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Section: Resultsmentioning

confidence: 93%