沸石
铵
过程(计算)
化学
自然(考古学)
离子
废物管理
化学工程
环境化学
无机化学
制浆造纸工业
环境科学
有机化学
催化作用
计算机科学
地质学
工程类
古生物学
操作系统
作者
L. D. Currie,Graeme J. Millar,Virginia Gray,Lalehvash Moghaddam
标识
DOI:10.1016/j.jwpe.2024.105714
摘要
Removal of ammonium from aqueous solutions using natural zeolite is diffusion limited. Consequently, a polymer-natural zeolite powder composite was developed as it allowed use of fine powders instead of rocks. Polyvinyl chloride (PVC) was dissolved in N-Methyl-2-pyrrolidone and mixed with natural zeolite powder prior to dropwise addition to an anti-solvent comprising of water and methanol. Spherical composite beads (80 to 90 wt% natural zeolite) exhibited a bead size of 2.5 to 2.7 mm in diameter and an ion exchange capacity similar to pure zeolite (c.f. 145 meq/100 g for natural zeolite powder). Attrition rates indicated that composites were more robust (<2.5 % mass loss) than 1–2 mm natural zeolite granules. Under selected synthesis conditions, the ammonium exchange rates of the beads were higher than the 1–2 mm zeolite granules. During the initial stages of the exchange, there was up to a 75.2 % increase in the amount of ammonium loaded onto the zeolite beads in comparison to the granules. The temperature and composition of the anti-solvent did not significantly influence composite ion exchange capabilities. Future studies should focus on scaling the technology to allow column testing and diversify into the creation of alternative composite materials.
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