本文關(guān)鍵詞： 碳納米管 吸附 解吸附 生物模擬液 協(xié)同效應(yīng)　出處：《上海大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：碳納米管因其獨(dú)特的結(jié)構(gòu)和優(yōu)異的性能引起了人們極大的關(guān)注,在能源、電子行業(yè)、材料行業(yè)、生物醫(yī)藥和環(huán)境應(yīng)用等領(lǐng)域有著廣泛的應(yīng)用。如作為性能優(yōu)異的吸附劑,碳納米管對許多污染物都能表現(xiàn)出很高的吸附能力,因此在水處理過程中有良好的應(yīng)用前景。與此同時,由于其廣泛的應(yīng)用和巨大的潛力,碳納米管的生物安全性也一直備受關(guān)注。近年來,碳納米管和重金屬離子的協(xié)同毒性作用引起了不少學(xué)者的興趣,一些研究表明碳納米管會加劇重金屬離子的毒性。可是,目前的研究主要集中在測量這種協(xié)同效應(yīng),對相關(guān)機(jī)制研究很少。要充分了解碳納米管與金屬離子協(xié)同作用的機(jī)制,第一步就是要研究在生物系統(tǒng)中金屬離子在碳納米管上的吸附和解吸附情況。本文用硝硫混酸氧化的方法制備O-MWCNTs,并系統(tǒng)研究了生物模擬液體系中典型重金屬離子在O-MWCNTs上的吸附和解吸附情況。測定了Pb2+、Cu2+、Zn2+、Cd2+在O-MWCNTs上的動力學(xué)曲線和等溫吸附曲線,四種金屬離子共存時的競爭吸附情況。然后在生物模擬液中測定了單獨(dú)和競爭情況下Pb2+、Cu2+、Zn2+、Cd2+從O-MWCNTs上的解吸附的情況。實(shí)驗(yàn)結(jié)果表明,碳納米管對Pb2+、Cu2+、Zn2+和Cd2+有比較高的吸附能力并且吸附速度很快,在競爭吸附中Pb2+的吸附量最高。在不同的生物模擬液中,四種金屬離子的解吸附狀況完全不一樣,解吸附很大程度上受p H和蛋白/其他陽離子的影響。在胃模擬液中,金屬離子解吸的最多,其他幾種生物模擬液中相對較少。競爭吸附的結(jié)果顯示Pb2+與碳納米管結(jié)合的更緊密,因此它的解吸附較少。和單一金屬解吸附情況相比,競爭解吸附情況下,四種金屬離子的解吸附情況完全不一樣。這些研究結(jié)果為更好地評估碳納米管的生物安全性以及與重金屬離子的協(xié)同效應(yīng)的機(jī)制提供了重要數(shù)據(jù)。
[Abstract]:Carbon nanotubes (CNTs) have attracted great attention due to their unique structure and excellent properties, in the energy, electronics and materials industries. As an excellent adsorbent, carbon nanotubes (CNTs) have been widely used in many fields such as biomedicine and environmental applications. Therefore, there is a good application prospect in the process of water treatment. At the same time, the biological safety of carbon nanotubes has been concerned in recent years because of its wide application and great potential. The synergistic toxicity of carbon nanotubes and heavy metal ions has aroused the interest of many scholars. Some studies have shown that carbon nanotubes can increase the toxicity of heavy metal ions. The current research focuses on the measurement of this synergistic effect, but few on the related mechanisms. It is necessary to fully understand the mechanism of the interaction between carbon nanotubes and metal ions. The first step is to study the adsorption and desorption of metal ions on carbon nanotubes in biological system. The adsorption and desorption of typical heavy metal ions on O-MWCNTs were studied systematically, and Pb2 Cu2 + Zn2 was determined. The kinetic curves and isothermal adsorption curves of Cd2 on O-MWCNTs, and the competitive adsorption of four metal ions in the presence of four metal ions. The desorption of Cu2 ~ (2 +) Zn ~ (2 +) ~ (2 +) CD _ (2) from O-MWCNTs. The experimental results show that Pb2 _ (2) Cu _ (2) is adsorbed by carbon nanotubes. Zn2 and Cd2 have relatively high adsorption capacity and the adsorption rate is very fast. The adsorption capacity of Pb2 is the highest in competitive adsorption. The desorption of the four metal ions is completely different, and the desorption is largely influenced by pH and protein / other cations. In the gastric analogue, the desorption of metal ions is the most. The results of competitive adsorption show that Pb2 binds more closely to carbon nanotubes, so it is less desorbed than that of single metal. Competitive desorption. These results provide important data for evaluating the biological safety of carbon nanotubes and the mechanism of synergistic effect with heavy metal ions.
【學(xué)位授予單位】：上海大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O647.3;X703

【共引文獻(xiàn)】

相關(guān)期刊論文 前2條

1 邱艷;葉群麗;劉凱;;二甲酚橙分光光度法測定土壤中鉛的研究[J];安徽農(nóng)業(yè)科學(xué);2011年21期

2 郎林;江林;朱丹;陳培;劉潤龍;馮景偉;;碳納米管對孔雀石綠的吸附特性[J];環(huán)境科學(xué)與技術(shù);2014年12期

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本文編號：1467409