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The TG and zeta-potential characterization of silver-zeolite composites for anti-bacterial capability

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Abstract

The porous, stable zeolite materials impregnated with 1 wt% silver (AgZ) were used as anti-bacterial filters to reduce the bio-aerosols as bacterial counts in the indoor air quality of a medical facility to fulfill the regulation of the Taiwan environmental protection administration. The anti-bacterial efficacies of AgZ reach 99 % after 2 h of air circulation in rooms, and its capacity could be re-generated through heated air at 160 °C. The stability and characteristics of AgZ were analyzed by the transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, and zeta-potential. Heat of the endothermic reaction of AgZ was evaluated to be 377–388 J g−1 and was discovered as stable below 300 °C. The analysis results also showed the recovery of second isoelectric points at pH 8.5 of AgZ could represent the ability to adsorb negative charged bio-aerosols as well as anti-bacterial capacity.

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Acknowledgements

The authors thank the Ministry of Economic Affairs, Taiwan (98-EC-17-A-10-S1-113) for partial financial support and thank Professor Hsieh’s research group at the National Yunlin University of Science and Technology (YunTech) for preparing AgZ and anti-bacterial experiments. The assistance of Dr. Wu in TG and DSC analysis was also appreciated.

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Authors and Affiliations

  1. Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology (NYUST), 123, University Rd., Sec. 3, Douliou, 64002, Yunlin, Taiwan, ROC

    Yeoung-Sheng Wang & Jyun-Hong Shen

  2. Department and Graduate School of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology (NYUST), 123, University Rd., Sec. 3, Douliou, 64002, Yunlin, Taiwan, ROC

    Jhan-Ping Lin & Jao-Jia Horng

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  1. Yeoung-Sheng Wang
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  2. Jyun-Hong Shen
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Correspondence to Jao-Jia Horng.

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Wang, YS., Shen, JH., Lin, JP. et al. The TG and zeta-potential characterization of silver-zeolite composites for anti-bacterial capability. J Therm Anal Calorim 111, 1443–1448 (2013). https://doi.org/10.1007/s10973-012-2493-1

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  • DOI: https://doi.org/10.1007/s10973-012-2493-1

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