Polysulfone-Gd2Zr2O7 mixed-matrix membranes with superior radiation resistant properties: Fabrication and application of a membrane device for radioactive effluent treatment
| Autor: | Aniruddha Kumar, B.C. Nailwal, Dheeraj Jain, Kumar A. Dubey, Avesh K. Tyagi, Avishek Pal, Bibhu N. Rath, Balaji P. Mandal, Ratnesh Jain, Ramesh C. Bindal, Naveen Kumar, A.K. Singha, Nitesh Goswami, Amita Bedar, Soumitra Kar, Anil K. Debnath |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Aqueous solution
Materials science Fouling Liquid radioactive waste Ultrafiltration General Medicine Mixed-matrix membrane chemistry.chemical_compound Membrane Chemical engineering chemistry γ-radiation resistance Gd2Zr2O7 TP155-156 Crystallite Irradiation Leaching (metallurgy) Polysulfone Absorbed Radiation Dose |
| Zdroj: | Chemical Engineering Journal Advances, Vol 1, Iss, Pp 100006-(2020) |
| ISSN: | 2666-8211 |
| Popis: | This is the first study undertaken towards development of mixed-matrix membranes (MMMs) with enhanced radiation resistant attributes by reinforcement of nanostructured Gd2Zr2O7 (GZO) within polysulfone (Psf) host-matrix. The study describes synthesis and characterization of GZO in disordered, defect-fluorite structure, having average crystallite size of 31(±3) nm. Membranes prepared with different loading of GZO (up to 2 w/w% of Psf) are exposed to γ-radiation up to a dose of 1000 kGy in aqueous environment. The effect of radiation on the structural, mechanical, and thermo-oxidative properties of MMMs has been compared with that of radiation-sensitive Psf membrane. The ultrafiltration performance of the (un)irradiated Psf and MMMs reveal that an optimum reinforcement of GZO at 1 (w/wPsf)% offers ~10 times radiation resistant MMM, compared to that of Psf membrane. The MMM with 1 (w/wPsf)% GZO was rolled into 2512 spiral configuration and a highly-compact device was developed for treatment of radioactive effluent. Based on the flux decline behaviour over 18 months duration, the fouling behaviour of the MMM module was modelled. The life-span of the MMM was predicted based on the absorbed radiation dose, GZO leaching study, and fouling behaviour. It is proposed that GZO mitigates a fraction of the impinged γ-energy in swapping of the Gd3+ and Zr4+ sites, which protects the polymeric host-matrix in-situ from radiation induced degradation. The abundance of Gd3+ and Zr4+ associated with polar O2− over the impregnated GZO further stabilizes MMMs through scavenging of the oxidizing and reducing radiolysed products of water. Thus, we report a smart approach to develop novel MMM with greater life-expectancy against high-energy radiation and further fabricate a membrane-based device for management of liquid radioactive waste. |
| Databáze: | OpenAIRE |
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