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標題: | 奈米矽片銀改質濾材對生物氣膠控制效率之研究 Control Efficiency of Silver Nanoparticles/Clay Modified Filter for Bioaerosols |
作者: | Jiung-Wen Chen 陳炯文 |
指導教授: | 李慧梅(Whei-May Lee) |
關鍵字: | 室內空氣品質,空氣清淨技術,奈米銀,生物氣膠,抗菌,過濾, indoor air quality,air cleaning technology,silver nanoparticles,bioaerosols,antimicrobial activity,filtration, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 生物氣膠會對人體健康造成不良的影響,目前控制室內生物氣膠的方法之一為使用奈米銀濾材,然而奈米銀粒徑非常微小(1~100 nm),容易進入並累積於細胞中產生細胞毒性,因此本研究選用細胞毒性較低的奈米矽片銀作為抗菌劑固定於濾材上,形成「奈米矽片銀抗菌濾材」,進以去除生物氣膠活性。測試奈米矽片銀的抗菌效果,E. coli與C. famata在0.08 mg/L濃度下的20分鐘之活性為初始濃度的7.9±0.2%與37.1±7.1%,顯示奈米矽片銀本身具有良好的殺菌效果。過濾效率測試顯示在RH=30%時,濾材改質前後對E. coli的40分鐘之平均過濾效率由18.9%上升至39.4%,對C. famata則由88.8%下降至77.7%;RH=70%時,改質前後對E. coli過濾效率由50.18%由下降至43.89%,C. famata則由92.0%下降至84.4%,顯示大部分情況下改質程序處理過的濾材對生物氣膠的過濾效率會下降,且相對濕度較高時有較高的過濾效率。測試濾材上微生物隨時間變化的存活率,發現在RH=30%與70%時,C. famata在未改質濾材上經過1,000分鐘後分別為103.2±15.1%與83.1±5.1%,在改質濾材上經過1,000分鐘後分別為50.8±23.6%與23.9±12.1%,顯示奈米矽片銀改質濾材具有抑菌效果,且高相對濕度的效果較好。本研究結果顯示,將奈米矽片銀與空氣過濾濾材結合可去除附著於濾材上的微生物之活性,是具有發展潛力之空氣清淨技術。 It has been known that bioaerosols have adverse effects on human health. Currently one of the practical ways to control indoor bioaerosols is to apply silver nanoparticles (AgNPs)-modified filter to air purifier. However, the sizes of AgNPs are extremely small (1~100 nm) and thus AgNPs will penetrate cell membranes and accumulate in cells, which may cause cytotoxicity. The objective of this study is to develop a brand-new air filter with high antimicrobial activity and low cytotoxicity. To do this, high surface clay-supported silver nanohybrids (AgNPs/clay) were immobilized on filter as an antimicrobial agent to inactivate microorganisms captured. Due to the intrinsic geometric characteristic of clay, AgNPs do not penetrate into cells. The antimicrobial activities of AgNPs/Clay were examined. The relative viability of E. coli and C. famata was 7.9±0.2% and 37.1±7.1%, respectively, after microorgamisms contacted with AgNPs/Clay solution at a concentration of 0.08 mg/L within 20 min. The filtration efficiencies of both untreated and treated filter were measured. When RH was at 30%, 40-minute average filtration efficiency was from 18.9% to 39.4% for E. coli and from 88.8% to 77.7% for C. famata after filters underwent modification process. When RH was at 70%, 40-minute average filtration efficiency was from 50.18% to 43.89% for E. coli and from 92.0% to 84.4% for C. famata after filters underwent modification process. These results not only indicate that in most cases treated filter possessed lower filtration efficiency compared with untreated filter, but show that filters performed better under high relative humidity. The viability of microorganisms on filter varies with time were also examined. The viability of C. famata after 1,000 min was 103.2±15.1% and 83.1±5.1% on untreated filter when RH was at 30% and 70%, respectively, while it was 50.8±23.6% and 23.9±12.1% on treated filter. These results indicate that AgNPs/clay-modified filter can inhibit the growth of microorganisms. Besides, treated filter possesses higher antimicrobial activity under high relative humidity. The findings of this study suggest that AgNPs/clay-modified air filter can inactivate microorganisms attached on it and can therefore be a promising air cleaning technology. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60844 |
全文授權: | 有償授權 |
顯示於系所單位: | 環境工程學研究所 |
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