發(fā)布時(shí)間：2018-03-09 05:35

  本文選題：電催化氧化　切入點(diǎn)：鈦基金屬氧化物　出處：《蘇州科技學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：制備了四種陽極:Ti/SnO_2-Sb電極、Ti/SnO_2-Sb/PbO_2電極、Ti/SnO_2-Sb/MnO_2電極和Ti/TiO_2-NTs/SnO_2-Sb/PbO_2電極,分別用線性伏安掃描(LSV)、掃描電鏡(SEM)、X射線衍射(XRD)、電極加速壽命等方法對電極性能進(jìn)行了表征,并以苯酚為目標(biāo)污染物,考察了幾種電極的電降解性能。另外,還將Ti/TiO_2-NTs/SnO_2-Sb/PbO_2電極用于降解實(shí)際印染廢水。研究結(jié)果如下:(1)比較了Ti/SnO_2-Sb、Ti/SnO_2-Sb/PbO_2和Ti/SnO_2-Sb/MnO_2三種電極對苯酚的電降解性能。研究結(jié)果表明:3種電極對苯酚降解反應(yīng)均遵循一級反應(yīng)動(dòng)力學(xué)規(guī)律。當(dāng)電流密度為10 mA/cm2,降解初始濃度為100 mg/L苯酚溶液時(shí),Ti/SnO_2-Sb,Ti/SnO_2-Sb/PbO_2,和Ti/SnO_2-Sb/MnO_2電極對苯酚去除率分別為99.4%、98.2%、63.6%,COD去除率分別為80.1%、76.8%、40%。其中Ti/SnO_2-Sb/PbO_2電極由于具有最長的加速壽命(41 h),較高的析氧電位(1.78V)和較好的電催化活性被認(rèn)為是降解苯酚的最佳電極。(2)為了進(jìn)一步提高Ti/SnO_2-Sb/PbO_2電極的使用壽命,在電極中間層中引入了二氧化鈦納米管,制備了Ti/TiO_2-NTs/SnO_2-Sb/PbO_2電極。采用陽極氧化法分別在乙二醇電解液體系和丙三醇電解液體系中制備了二氧化鈦納米管。研究結(jié)果表明:以乙二醇電解液體系制備的納米管管口為圓形,且隨著陽極氧化電壓的增大,納米管的管徑和管壁厚度增大。以丙三醇電解液體系制備的納米管管口為螺線性,且管子呈條紋型的竹節(jié)狀。450℃煅燒后二氧化鈦納米管的晶型由無定型狀態(tài)轉(zhuǎn)化為銳鈦型。(3)以丙三醇體系制備的TiO_2-NTs為基體制備了Ti/TiO_2-NTs/SnO_2-Sb/PbO_2電極,并考察了該電極對苯酚的降解效果。研究結(jié)果表明:Ti/TiO_2-NTs/SnO_2-Sb/PbO_2電極與Ti/SnO_2-Sb/PbO_2電極相比,電極表面顆粒細(xì)小致密、擁有更長的加速壽命(77.5h)、更高的析氧電位(1.93V)和更好的降解效果(苯酚去除率99.3%,COD去除率86.5%),對苯酚的降解符合一級動(dòng)力學(xué)規(guī)律。利用異丙醇作為羥基自由基捕獲劑,3h后苯酚的降解率僅為69%,較未加入時(shí)的去除率大大下降,說明苯酚的降解為羥基自由基原理。(4)將Ti/TiO_2-NTs/SnO_2-Sb/PbO_2電極用于處理實(shí)際印染廢水,考察了電流密度、pH、電解時(shí)間對印染廢水中COD和氨氮的影響。研究結(jié)果表明,降解印染廢水的最佳電流密度為20 mA/cm2,最佳p H為7。COD和氨氮濃度隨電解時(shí)間的延長逐漸降低,降解3h時(shí)均達(dá)到《紡織染整工業(yè)水污染物排放標(biāo)準(zhǔn)》GB4287-2012的間接排放標(biāo)準(zhǔn)。
[Abstract]:Four kinds of anode: ti / SnO _ 2-Sb / Ti / SnO _ 2-S _ bO _ 2-S _ bO _ 2-S _ bO _ 2 electrode and Ti / SnO _ 2-SbO _ 2-Mn _ 2O _ 2 electrode and Ti/TiO_2-NTs/SnO_2-Sb/PbO_2 electrode were prepared. The electrode properties were characterized by linear voltammetry scanning, scanning electron microscope (SEM), X-ray diffraction (XRD), accelerated lifetime of the electrode, and phenol as the target pollutant, respectively. The electrodegradation properties of several kinds of electrodes were investigated. The Ti/TiO_2-NTs/SnO_2-Sb/PbO_2 electrode is also used to degrade the actual printing and dyeing wastewater. The results are as follows: 1) the electrochemical degradation properties of the three kinds of Ti / SnO _ 2-SbO _ 2-SbO _ 2-SbO _ 2-S _ bO _ 2 and Ti/SnO_2-Sb/MnO_2 electrodes for phenol degradation are compared. The results show that the degradation of phenol at the three kinds of electrodes follows the first-order reaction kinetics. Rule: when the current density is 10 Ma / cm ~ 2 and the initial concentration of degradation is 100 mg/L phenol solution, Ti- / SnO _ 2-SbO _ 2-SbO _ 2-SbO _ 2-SbO _ 2-SbO _ 2 and Ti/SnO_2-Sb/MnO_2 electrode are 99.498. 22% and 63.6% respectively. The Ti/SnO_2-Sb/PbO_2 electrode has the longest accelerated lifetime of 41 h and higher oxygen evolution rate. In order to further improve the service life of Ti/SnO_2-Sb/PbO_2 electrode, the potential 1.78V) and the better electrocatalytic activity are considered as the best electrode for phenol degradation. Titanium dioxide nanotubes were introduced into the middle layer of the electrode. Ti/TiO_2-NTs/SnO_2-Sb/PbO_2 electrode was prepared. Titanium dioxide nanotubes were prepared in ethylene glycol electrolyte system and glycerol electrolyte system by anodizing method. The diameter and wall thickness of nanotubes increased with the increase of anodizing voltage. After calcined at 450 鈩，

本文編號：1587239