Abstract Various type of zeolites has been produced based on kaolinite and this study likewise utilized kaolin clay as raw material to synthesis zeolite A. Kaolin was in inactive state, therefore it was transformed to metakaolin through dehydroxylation at 800 °C for 4 h. The metakaolin as a source of silica and alumina was then utilized in the synthesis of zeolite A. After hydrothermal synthesis, the zeolite A was exchanged with different concentration of zinc nitrate solution. Zinc content in ion-exchanged zeolite A, ZnA was determined through AAS to calculate the ion exchange capacity. Higher concentration of zinc nitrate had higher zinc content and higher ion exchange capacity. Zeolite A and zinc-exchanged zeolite A were characterized under SEM, XRD and FTIR. Finally, zeolite A and zinc-exchanged zeolite A was used to investigate the antimicrobial properties against gram-negative bacteria, Escherichia coli and gram-positive bacteria Staphylococcus aureus. There was no antimicrobial activity for zeolite A yet zinc-ion–exchanged zeolite A showed inhibition zones around the samples for both the microorganisms.

中文翻译：

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沸石A与硝酸锌的离子交换能力及其抗菌活性

摘要 以高岭石为基础制备了多种类型的沸石，本研究同样以高岭土为原料合成沸石A。高岭土处于非活性状态，因此通过在800℃下脱羟基4小时转化为偏高岭土。然后将偏高岭土作为二氧化硅和氧化铝的来源用于合成沸石 A。水热合成后，将沸石 A 与不同浓度的硝酸锌溶液交换。离子交换沸石A中的锌含量，通过原子吸收光谱法测定ZnA以计算离子交换容量。较高浓度的硝酸锌具有较高的锌含量和较高的离子交换能力。沸石A和锌交换沸石A在SEM、XRD和FTIR下表征。最后，沸石 A 和锌交换沸石 A 用于研究对革兰氏阴性菌、大肠杆菌和革兰氏阳性菌金黄色葡萄球菌的抗菌性能。沸石 A 没有抗菌活性，但锌离子交换的沸石 A 在样品周围显示出两种微生物的抑制区。