本文選題：碳納米管 + Sb(Ⅲ)�。� 參考：《浙江大學(xué)》2013年碩士論文

【摘要】：隨著我國(guó)工業(yè)化進(jìn)程的加速和城市化水平的提高,很多城市的飲用水源中有毒有機(jī)污染物和痕量重金屬含量明顯增加,水質(zhì)安全的狀況日益嚴(yán)重。銻(Sb)是自然界存在的一種有毒元素,作為重要的戰(zhàn)略資源,銻被廣泛應(yīng)用于剎車片、阻燃劑、醫(yī)藥等行業(yè)。近十幾年來(lái),人類對(duì)銻的需求和消耗倍增,促進(jìn)了銻礦資源的大規(guī)模開發(fā),這一定程度上增加了環(huán)境水體中銻的含量。加之目前我國(guó)仍未對(duì)工業(yè)廢水中銻的排放標(biāo)準(zhǔn)作出相應(yīng)的規(guī)定,水體中的銻污染問(wèn)題日益嚴(yán)重。以往研究表明,銻是一種較難去除的重金屬,而現(xiàn)有除銻技術(shù)的研究仍尚顯不足,為此,本文以尋求先進(jìn)高效的除銻方法作為研究目標(biāo)。本論文以新型納米材料碳納米管(CNTs)為載體,采用金屬氧化物負(fù)載改性的方法制備新型復(fù)合材料Fe2O3/CNT及MnO2/CNT,并探討了它們對(duì)水中Sb(Ⅲ)的吸附性能及機(jī)理。 本文第一部分采用負(fù)載改性法中的液相化學(xué)沉積法成功制備了Fe2O3/CNT復(fù)合材料。并利用X射線衍射儀(XRD)、激光粒度儀、掃描電鏡(SEM)、透射電鏡(TEM)、BET和傅里葉紅外光譜儀(FTIR)對(duì)改性前后CNTs的物化性能進(jìn)行了表征。通過(guò)對(duì)水中Sb(Ⅲ)的靜態(tài)吸附試驗(yàn)考察了改性碳納米管的吸附容量,同時(shí)還考察了pH值、銻的初始濃度、吸附劑投加量、吸附時(shí)間和溫度對(duì)吸附效果的影響。結(jié)果表明,在Sb(Ⅲ)初始濃度為1.5mg/L、吸附劑投加量為0.5g/L、溫度為298K、pH值為7.00的條件下,Fe203改性后的碳納米管對(duì)銻的去除率可達(dá)到99.97%,比未改性碳納米管的去除率提高了29.81%,吸附容量也從原始CNTs的3.01mg/g增大到6.23mg/g。最后發(fā)現(xiàn)該吸附過(guò)程較好地符合Freundlich吸附等溫線,吸附效果幾乎不受pH值的影響。 本文第二部分探討了MnO2改性碳納米管對(duì)銻的去除情況。采用液相氧化還原法成功制備了MnO2/CNT復(fù)合材料,并利用X射線衍射儀(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)、BET和激光粒度儀對(duì)改性前后CNTs的物化性能進(jìn)行了表征。通過(guò)對(duì)水中Sb(Ⅲ)的靜態(tài)吸附試驗(yàn)考察了改性碳納米管的吸附容量,同時(shí)還考察了pH值、銻的初始濃度、吸附劑投加量、吸附時(shí)間和溫度對(duì)吸附效果的影響。結(jié)果表明,在Sb(Ⅲ)初始濃度為1.5mg/L、吸附劑投加量為0.5g/L、溫度為298K、pH值為2.00的條件下,二氧化錳改性后的碳納米管對(duì)銻的去除率可達(dá)到97.72%,比未改性碳納米管的去除率提高了51.29%,吸附容量也從原始CNTs的3.01mg/g增大至6.00mg/g,吸附過(guò)程較好地與Freundlich吸附等溫線符合。試驗(yàn)中,pH值對(duì)吸附效果的影響較大,僅在pH值為2.00附近去除效果較好,其他pH值條件下去除效果不理想。 研究表明Fe2O3/CNT和MnO2/CNT對(duì)溶液中Sb(Ⅲ)有著強(qiáng)于傳統(tǒng)吸附材料的去除能力,且Fe2O3/CNT在除銻性能方面要優(yōu)于MnO2/CNT。本研究將為處理水溶液中的痕量有害離子提供一個(gè)相對(duì)經(jīng)濟(jì)、高效和易于操作的方法。
[Abstract]:With the acceleration of industrialization and the improvement of urbanization in China, the contents of toxic organic pollutants and trace heavy metals in drinking water sources of many cities have increased obviously, and the situation of water quality safety is becoming more and more serious. Antimony (SB) is a toxic element in nature. As an important strategic resource, antimony is widely used in brake pads, flame retardants, medicine and other industries. In recent years, the human demand and consumption of antimony have doubled, which has promoted the large-scale development of antimony resources, which to some extent has increased the content of antimony in environmental water. In addition, the discharge standard of antimony in industrial wastewater has not been regulated in China at present, and the problem of antimony pollution in water is becoming more and more serious. Previous studies have shown that antimony is a kind of heavy metal which is difficult to remove, but the existing antimony removal technology is still insufficient. Therefore, the aim of this paper is to seek advanced and efficient antimony removal methods. In this paper, the novel composites Fe _ 2O _ 3 / CNT and MNO _ 2 / CNT were prepared by metal oxide supported modification with carbon nanotubes (CNTs), and their adsorption properties and mechanism for SB (鈪，

本文編號(hào)：2059212