本文選題：納米碳管 + DOM結(jié)構(gòu)�。� 參考：《昆明理工大學(xué)》2016年碩士論文

【摘要】：作為重要的工程納米材料,納米碳管(Carbon Nanotubes, CNTs)由于其獨(dú)特的物化性質(zhì)(機(jī)械強(qiáng)度、導(dǎo)電性和儲氫能力等),在人類生產(chǎn)生活中具有應(yīng)用廣泛。由于對CNTs應(yīng)用的不斷增加,使其不可避免地進(jìn)入環(huán)境中,對生態(tài)環(huán)境產(chǎn)生難以預(yù)料的影響。之前很多研究關(guān)注了溶解性有機(jī)質(zhì)(Dissolve Organic Matter, DOM)對CNTs環(huán)境行為和風(fēng)險的影響,發(fā)現(xiàn)DOM可以促使CNTs懸浮,而CNTs一旦懸浮分散,其大量暴露的表面積與污染物會產(chǎn)生強(qiáng)烈的相互作用。由于處于納米尺度,懸浮CNTs可能攜帶污染物直接進(jìn)入生物體內(nèi),從而對生物體產(chǎn)生毒性,加之其較大的遷移性,加劇了懸浮CNTs及其吸附的有機(jī)污染物的環(huán)境風(fēng)險。然而,目前對不同機(jī)制下懸浮的CNTs對有機(jī)污染物的吸附特征關(guān)注還不夠,對不同性質(zhì)和結(jié)構(gòu)的懸浮劑懸浮CNTs的機(jī)制研究也很少。因此,本研究選取單寧酸(Tannic Acid, TA)、沒食子酸(Gallic Acid, GA)和十二烷基苯磺酸鈉(Sodium Dodecylbenzenesulfonate, SDBS)為三種不同性質(zhì)和結(jié)構(gòu)的懸浮劑,研究了不同性質(zhì)的懸浮劑在CNTs上的吸附行為,明確了不同性質(zhì)的懸浮劑分散CNTs的機(jī)制；以雙酚A (Bisphenol A, BPA)為污染物,研究了不同性質(zhì)懸浮劑懸浮的CNTs對有機(jī)污染物的吸附性能。得到如下結(jié)果：1.在三種懸浮劑濃度到達(dá)TA和SDBS的達(dá)臨界膠束濃度(critical micellar concentrations, CMC)前,CNTs懸浮量的順序?yàn)椋篢A SDBS GA。結(jié)合TA、 SDBS和GA三種懸浮劑在CNTs上的吸附量,發(fā)現(xiàn)盡管CNTs的懸浮受到懸浮劑在CNTs上吸附量的影響,但懸浮劑的性質(zhì)和結(jié)構(gòu)等是控制CNTs懸浮量的最重要因素。因此,TA、SDBS和GA在CNTs上的吸附是各種機(jī)理共同作用的結(jié)果,其中最重要的控制因素是空間位阻作用,其他還包括憎水性作用、π-π電子供受體作用、氫鍵作用等。TA、SDBS口GA形成的空間位阻作用是控制納米碳管懸浮的主要機(jī)理。2.研究發(fā)現(xiàn)TA、SDBS和GA三種懸浮劑懸浮的CNTs吸附BPA的量的順序與TA、SDBS和GA三種懸浮劑在CNTs上造成的空間位阻作用的強(qiáng)弱順序相反。此外,結(jié)合對BPA在TA、SDBS和GA三種懸浮劑懸浮的CNTs上吸附機(jī)理的分析,可以推斷空間位阻作用是控制BPA在CNTs上吸附的最主要作用。當(dāng)?shù)竭_(dá)懸浮劑的CMC時,吸附在CNTs表面的懸浮劑對BPA的增溶效應(yīng)導(dǎo)致BPA在CNTs上的吸附增加。
[Abstract]:As an important engineering nanomaterials, carbon nanotubes (CNTs) have been widely used in human production and life due to their unique physical and chemical properties (mechanical strength, electrical conductivity and hydrogen storage capacity). Because of the increasing application of CNTs, it inevitably enters into the environment and has unpredictable influence on the ecological environment. Previous studies have focused on the effects of dissolved organic matter Dissolve Organic matter (Dom) on the environmental behavior and risk of CNTs. It has been found that DOM can promote the suspension of CNTs, while once suspended, the surface area exposed to CNTs strongly interacts with pollutants. Because of its nanometer scale, suspended CNTs may carry pollutants directly into the body of organisms, thus causing toxicity to organisms and its large mobility, which increases the environmental risk of suspended CNTs and its adsorbed organic pollutants. However, little attention has been paid to the adsorption characteristics of organic pollutants by suspended CNTs under different mechanisms, and the mechanism of suspended CNTs with different properties and structures has been seldom studied. Therefore, in this study, Tannic acid, Taci, Gallic acid (GA) and sodium dodecyl benzenesulfonate (SDBs) were selected as three kinds of suspensions with different properties and structures, and the adsorption behaviors of different suspensions on CNTs were studied. The mechanism of dispersion of CNTs with different suspensions was clarified, and the adsorption properties of CNTs suspended with different properties for organic pollutants were studied by using bisphenol A and bisphenol A as pollutants. Get the following result: 1. Before the concentration of three suspensions reaches the critical micelle concentration of TA and SDBS, the order of suspension amount of micellar is: 1 TA SDBS GA. Combined with the adsorption capacity of TAA, SDBS and GA on CNTs, it was found that, although the suspension of CNTs was affected by the amount of adsorbent adsorbed on CNTs, the properties and structure of suspensions were the most important factors controlling the suspension amount of CNTs. Therefore, the adsorption of TASDBS and GA on CNTs is the result of various mechanisms, among which the most important controlling factor is steric hindrance, and other factors include hydrophobicity, 蟺-蟺 electron donor receptor. The main mechanism of controlling the suspension of carbon nanotubes is the steric hindrance formed by the formation of GA at the mouth of TAA SDBs by hydrogen bonding. It is found that the order of the amount of BPA adsorbed by CNTs suspended by TASDBS and GA is opposite to the order of the spatial steric resistance caused by TASDBS and GA on CNTs. In addition, based on the analysis of the adsorption mechanism of BPA on CNTs suspended by TASDBS and GA, it can be concluded that the steric hindrance is the most important role in controlling the adsorption of BPA on CNTs. When the CMC reached the suspension, the solubilization effect of the suspension adsorbed on the surface of CNTs resulted in the increase of the adsorption of BPA on CNTs.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TQ127.11;TB383.1

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