【摘要】：為提高二氧化鈦（TiO_2）光催化去除飲用水消毒副產(chǎn)物溴酸鹽（BrO_3~-）的效率，本文圍繞貴金屬改性二氧化鈦光催化去除溴酸鹽開(kāi)展了系統(tǒng)的研究，以期進(jìn)一步提高二氧化鈦光催化去除溴酸鹽速率，推動(dòng)光催化還原法在飲用水水處理領(lǐng)域的應(yīng)用。 首先，開(kāi)展了貴金屬改性二氧化鈦光催化劑篩選的研究。采用等體積浸漬法制備了各貴金屬（包括鉑Pt、鈀Pd、釕Ru、銠Rh、銥Ir、金Au和銀Ag）改性二氧化鈦，通過(guò)UV-Vis漫反射和XPS表征了催化劑的光吸收性能及表面元素組成，考察了紫外光下其光催化去除溴酸鹽活性。結(jié)果表明，Pt和高負(fù)載量的Ag有效提高了TiO_2光催化去除BrO_3~-的活性，Pd、Ru、Au、Ir、Rh和低負(fù)載量的Ag抑制了TiO_2光催化去除BrO_3~-活性。 其次，開(kāi)展了紫外光下優(yōu)選的Pt/TiO_2光催化劑光催化去除溴酸鹽的研究�？疾炝烁饔绊懸蛩�，包括負(fù)載量、煅燒溫度、pH、溶解氧、有機(jī)物乙醇和可見(jiàn)光等，對(duì)Pt/TiO_2光催化去除溴酸鹽的影響，并研究了Pt/TiO_2光催化去除溴酸鹽動(dòng)力學(xué)。結(jié)果表明，Pt/TiO_2最優(yōu)負(fù)載量為0.01%，最優(yōu)煅燒溫度為400℃；低pH極大地促進(jìn)了Pt/TiO_2光催化還原BrO_3~-；溶解氧嚴(yán)重抑制了Pt/TiO_2光催化去除BrO_3~-活性；有機(jī)物乙醇輕微抑制了Pt/TiO_2光催化去除BrO_3~-活性；1.0%Pt/TiO_2具有較好的可見(jiàn)光光催化去除溴酸鹽活性。Pt/TiO_2光催化去除BrO_3~-表現(xiàn)為一級(jí)反應(yīng)動(dòng)力學(xué)，動(dòng)力學(xué)常數(shù)K為0.03min~(-1)。 然后，開(kāi)展了紫外光下優(yōu)選的Ag/TiO_2光催化劑光催化去除溴酸鹽的研究�？疾炝烁饔绊懸蛩兀ㄘ�(fù)載量、煅燒溫度、pH、溶解氧、有機(jī)物乙醇和可見(jiàn)光等，對(duì)Ag/TiO_2光催化去除溴酸鹽的影響，并研究了Ag/TiO_2光催化去除溴酸鹽動(dòng)力學(xué)。結(jié)果表明，Ag/TiO_2最優(yōu)負(fù)載量為6.0%，最優(yōu)煅燒溫度為400℃；隨pH的增加，Ag/TiO_2催化去除BrO_3~-活性先增加后降低，最優(yōu)pH為7.2；向溶液中通入溶解氧和N2都抑制了Ag/TiO_2光催化去除BrO_3~-；有機(jī)物乙醇也抑制了Ag/TiO_2光催化去除BrO_3~-活性；6.0%Ag/TiO_2具有很好的可見(jiàn)光光催化去除溴酸鹽活性。Ag/TiO_2光催化去除BrO_3~-表現(xiàn)為一級(jí)反應(yīng)動(dòng)力學(xué)，動(dòng)力學(xué)常數(shù)K為0.01min~(-1)。 最后，開(kāi)展了可見(jiàn)光下，Ag/TiO_2光催化去除溴酸鹽的研究�？疾炝烁饔绊懸蛩�，，包括負(fù)載量、煅燒溫度、pH和有機(jī)物乙醇等，對(duì)Ag/TiO_2可見(jiàn)光光催化去除溴酸鹽的影響。結(jié)果表明，隨Ag負(fù)載量的增加，Ag/TiO_2光催化去除溴酸鹽先增加后趨穩(wěn)再降低，最優(yōu)Ag負(fù)載量為6%；最佳煅燒溫度為300℃；隨pH的增加，Ag/TiO_2可見(jiàn)光光催化還原BrO_3~-活性先增加后降低，最優(yōu)pH為7.2；有機(jī)物乙醇抑制了Ag/TiO_2可見(jiàn)光光催化去除BrO_3~-活性。
[Abstract]:In order to improve the efficiency of photocatalytic removal of bromate (BrO_3~-) from drinking water by titanium dioxide (TiO_2), a systematic study on the photocatalytic removal of bromate by noble metal modified titania was carried out in this paper. In order to further improve the titanium dioxide photocatalytic removal rate of bromate, promote the application of photocatalytic reduction in drinking water treatment. Firstly, the selection of noble metal modified titanium dioxide photocatalyst was studied. Titanium dioxide modified by platinum Pt, palladium, Pd, ruthenium, Rh, iridium, Ir, Au and silver Ag was prepared by isovolumetric impregnation method. The photoabsorption properties and surface element composition of the catalysts were characterized by UV-Vis diffuse reflection and XPS. The photocatalytic activity of bromate removal under ultraviolet light was investigated. The results showed that Pt and Ag with high loading effectively increased the photocatalytic activity of TiO_2 for BrO_3~- removal, and Pd,Ru,Au,Ir,Rh and low load Ag inhibited the photocatalytic removal of BrO_3~- from TiO_2. Secondly, the photocatalytic removal of bromate with Pt/TiO_2 photocatalyst was studied. The effects of various factors, including loading amount, calcination temperature, pH, dissolved oxygen, organic ethanol and visible light, on the removal of bromate by Pt/TiO_2 were investigated. The kinetics of Pt/TiO_2 photocatalytic removal of bromate was also studied. The results show that the optimum loading amount of Pt/TiO_2 is 0.01 and the optimal calcination temperature is 400 鈩

本文編號(hào)：2389907