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liulp2008木虫 (小有名气)
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[求助]
求助翻译英文文献。谢谢
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| As the membrane thickness increases, the distance that water needs to go through and the resistance that water needs to overcome both increase. Correspondingly, the duration increases and the water flux decreases. However, thicker self-supporting NaA zeolite membranes have high strength and good ion % rejection based on the salt rejection process in NaCl solutions. The salt rejection mechanism [1] of these membranes can be summarized as follows. First, the positively charged metal species, specifically sodium ions, are adsorbed onto the NaA zeolite surface, which makes the surface positively charged. Then, the positive surface charge prevents the hydrated cations from approaching the openings of the non-zeolitic pores, whereas the hydrated anions accelerate toward the openings. In other words, the charge exclusion mechanism and the size exclusion mechanism are cooperative [1]. The hydrated anions and cations can be adsorbed onto the surface or the interior of the zeolite, even if they diffuse and enter the membrane through the non-zeolitic pores. If the adsorbed ions reach equilibrium within a small quantity of non-zeolitic pores in the membrane, the pores cannot absorb additional ions due to concentration polarization. The salt rejection experiment demonstrated that a small quantity of non-zeolitic pores in the membrane does not influence the ion rejection but that the membrane thickness approaches specific thresholds. When the thickness of self-supported zeolite membrane arrived at the thresholds value, the influences of mesopores and macropores defects would be reduced and omitted. |
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