Developing decontamination technologies through studying diffusion in zeolite adsorbents

To aid the design and optimisation of cost-effective decontamination technologies used to remove toxic compounds from ground water in Ghana, the diffusion of water in zeolite molecular sieve candidates (zeolite A) synthesised in an economical manner from local clay minerals will be studied using quasielastic neutron scattering. Each zeolite sample, synthesised cheaply from Ghanaian kaolin and bauxite, will contain a different counterion (Ca2+, K+. Na+) which is expected to interact at different strengths with both water, and the potential contaminants (arsenic compounds, organonitriles). A comparison of diffusion rates and mechanisms in these potential zeolite candidates will not only provide insight into crucial sorbate-framework interactions in the design of decontamination technologies, but form the basis for future studies into the behaviour of the pollutants in these materials.为助力加纳地下水有毒化合物去除用高性价比净化技术的设计与优化，本研究将采用准弹性中子散射（quasielastic neutron scattering）技术，探究以经济方式从本地黏土矿物合成的沸石分子筛候选材料（zeolite molecular sieve candidates，A型沸石）中的水扩散行为。每个沸石样品均由加纳高岭土与铝土矿低成本合成，含有不同的抗衡离子（counterion：Ca²⁺、K⁺、Na⁺）——这些离子预计会与水及潜在污染物（砷化合物、有机腈）发生强度各异的相互作用。对比这些候选沸石材料中的扩散速率与机制，不仅能为净化技术设计中关键的吸附质-骨架相互作用（sorbate-framework interactions）提供洞见，还将为后续研究污染物在这些材料中的行为奠定基础。