本文關(guān)鍵詞： 三維電極 微弧氧化 光電催化 粒子電極　出處：《沈陽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：三維光電體系由于光電協(xié)同的有效作用,Ti O2的光催化活性得到充分發(fā)揮,有效提高對(duì)有機(jī)污染物的降解效率。本文選用蛭石作為載體粒子,利用溶膠—凝膠法制備Ti O2/蛭石,Ti O2/蛭石與石墨組成粒子電極,分別以溶膠凝膠法制備的鈦網(wǎng)電極(鈦網(wǎng)光電極)和微弧氧化法制備的鈦網(wǎng)電極(鈦網(wǎng)膜電極)為主電極,石墨片為對(duì)照陰極,亞甲基藍(lán)溶液為目標(biāo)降解物,支持電解質(zhì)為無水硫酸鈉溶液,固定光源為20w紫外燈,在恒定外電壓的作用下,研究三維光電催化體系對(duì)亞甲基藍(lán)溶液光電催化降解的效率。實(shí)驗(yàn)研究了三維電極光電催化性能的影響因素,Ti O2/蛭石與石墨粒子電極和鈦網(wǎng)光電極組成的三維光電體系的實(shí)驗(yàn)結(jié)果表明:當(dāng)二氧化鈦光電極的煅燒溫度為550℃,Ti O2/蛭石粒子的煅燒溫度500℃,石墨0.8 g,Ti O2/蛭石0.2 g,外接電壓2 V,電極距離3 cm,無水硫酸鈉溶液濃度0.02 mol/L,亞甲基藍(lán)溶液濃度5mg/L,p H=10。三維光電催化實(shí)驗(yàn)對(duì)亞甲基藍(lán)的脫色率為51.9%。負(fù)載Ag離子和Cu離子的鈦網(wǎng)光電極實(shí)驗(yàn)中,Ag離子負(fù)載量為1.0%,對(duì)亞甲基藍(lán)降解效果最好,脫色率為59.6%;Cu離子負(fù)載量為0.75%時(shí),對(duì)亞甲基藍(lán)的脫色率為53.2%。當(dāng)以Ti O2/蛭石與石墨粒子電極和鈦網(wǎng)膜電極組成的三維光電體系的實(shí)驗(yàn)結(jié)果表明:(1)當(dāng)6 g/L的磷酸鈉為電解液,微弧氧化反應(yīng)時(shí)間為5 min,光電催化對(duì)亞甲基藍(lán)的脫色率是40.15%。(2)在負(fù)載Ag離子和Cu離子的鈦網(wǎng)膜電極實(shí)驗(yàn)中,鈦網(wǎng)負(fù)載Ag+和Cu2+的最佳修飾法是再微弧氧化法,光電催化反應(yīng)持續(xù)60min對(duì)亞甲基藍(lán)脫色率分別為42.56%和39.55%,當(dāng)Cu2+濃度為0.01 mol/L,再微弧氧化時(shí)間為7 min時(shí),亞甲基藍(lán)的脫色率最佳為44.01%,當(dāng)Ag+濃度為0.01mol/L,電沉積時(shí)間為5 min時(shí),亞甲基藍(lán)的脫色率最佳為54.33%。(3)研究了微弧氧化鈦網(wǎng)電極、再微弧氧化負(fù)載Cu2+和Ag+電極和對(duì)甲醛的降解實(shí)驗(yàn),結(jié)果表明光電催化120 min的降解率分別為15.7%、21.9%和32.1%,微弧氧化負(fù)載Cu2+和Ag+的電極都高于只微弧氧化的鈦網(wǎng)電極,說明Cu2+和Ag+離子對(duì)電極的修飾均提高了體系催化效率。
[Abstract]:The photocatalytic activity of TIO _ 2 in three-dimensional photovoltaic system has been fully developed due to the effective effect of optoelectronic coordination, and the degradation efficiency of organic pollutants has been effectively improved. In this paper, vermiculite is selected as the carrier particle. TIO _ 2 / vermiculite / vermiculite / vermiculite particle electrode was prepared by sol-gel method. The titanium mesh electrode (titanium mesh photoelectrode) prepared by sol-gel method and titanium mesh electrode (titanium omentum electrode) prepared by micro-arc oxidation method were used as main electrode respectively. Graphite sheet was used as control cathode and methylene blue solution as target degradation material. The supporting electrolyte is anhydrous sodium sulfate solution and the fixed light source is 20w UV lamp under the action of constant external voltage. The efficiency of photocatalytic degradation of methylene blue solution by three-dimensional photocatalytic system was studied. The factors influencing the photocatalytic performance of the three-dimensional electrode were studied experimentally. The experimental results of 3D photovoltaic system composed of TIO _ 2 / vermiculite, graphite particle electrode and titanium mesh photoelectrode show that the calcination temperature of TIO _ 2 photoelectrode is 550 鈩，

本文編號(hào)：1445647