發(fā)布時(shí)間：2018-06-26 21:59

  本文選題：SrTiO_3 + 可控生長(zhǎng)　； 參考：《西南石油大學(xué)》2017年碩士論文

【摘要】：本文采用水熱法合成得到介孔鈦酸鍶(SrTi03,STO),利用羧甲基纖維素鈉(CMC)和十六烷基三甲基溴化銨(CTAB)作為形貌、孔徑控制劑分別獲得了孔徑更小的介孔STO和微孔STO。結(jié)果表明CMC和CTAB均能達(dá)到控制STO的平均孔徑尺寸的目的,介孔STO的平均孔徑范圍在10nm左右,比控制生長(zhǎng)前減小37.45%,微孔STO的平均孔徑在1.89 nm左右,比控制生長(zhǎng)前減小88.45%,對(duì)產(chǎn)物性能進(jìn)行了評(píng)價(jià),并分析了孔徑、染料分子對(duì)降解的影響機(jī)理。(1)通過對(duì)比STO對(duì)羅丹明B(RhB)和甲基橙(MO)一元染料的降解性能,發(fā)現(xiàn)介孔和微孔STO均對(duì)RhB的降解相比MO具有優(yōu)勢(shì);STO降解染料的降解速率大小依次為:RhBMO;(2)將介孔STO和微孔STO對(duì)二元復(fù)合染料(RhB+亞甲基藍(lán)(MB))降解的選擇性進(jìn)行探究,結(jié)果表明經(jīng)過CMC控制生長(zhǎng)得到的介孔STO降解RhB+MB混合二元染料,對(duì)MB的選擇性更強(qiáng),MB與RhB的一級(jí)動(dòng)力學(xué)常數(shù)之比達(dá)到3.50,10 nm孔徑的介孔STO對(duì)MB更具有偏向性和選擇性降解,降解速率大小依次為:MBRhB;(3)為了提高STO的光催化降解活性,我們進(jìn)行了Fe和Ag的摻雜及非晶Pd-Ni-P的修飾,Fe和Ag摻雜形成的氧化物降低產(chǎn)物禁帶寬度0.1 eV,發(fā)現(xiàn)了在光照30 min內(nèi),改性后產(chǎn)物MO的降解率分別提升了30%、50%和40%,Pd-Ni-P的修飾改變了 STO表面狀態(tài),合金促進(jìn)了 MO的降解;(4)以pH和染料種類為變量,探究不同pH的一元染料降解和不同二元染料降解的情況進(jìn)行探究,利用ζ電位與染料分子軌道LUMO-HOMO值,得到了二元染料降解的模型,解釋了 RhB敏化STO和STO敏化MB促進(jìn)了載流子的分離的過程。再利用循環(huán)伏安測(cè)試法對(duì)pH改變引起的動(dòng)力學(xué)常數(shù)增加現(xiàn)象進(jìn)行了解釋,得到染料的降解先后順序:MBRhBMO,說明H+濃度的改變影響了染料分子與H+的競(jìng)爭(zhēng)吸附,并導(dǎo)致染料分子氧化電位降低。
[Abstract]:In this paper, strontium titanate (SrTi03STO) was synthesized by hydrothermal method. The mesoporous STO with smaller pore size and micropore STO were obtained by using sodium carboxymethyl cellulose (CMC) and cetyltrimethylammonium bromide (CTAB) as morphology. The results show that both CMC and CTAB can control the average pore size of mesoporous STO. The average pore size of mesoporous STO is about 10nm, which is 37.45% smaller than that before controlling growth, and the average pore size of micropore STO is about 1.89 nm. The effect of pore size and dye molecule on the degradation of Rhodamine B (RhB) and methyl orange (MO) were analyzed. (1) by comparing STO with Rhodamine B (RhB) and methyl orange (MO), the degradation properties of Rhodamine B (RhB) and methyl orange (MO) were compared. It was found that both mesoporous STO and micropore STO had advantages over MO in degradation of RhB. The degradation rate of STO was 1: RhBMO.The selectivity of mesoporous STO and micropore STO to the degradation of binary composite dyes (RhB methylene blue (MB) was studied. The results show that the mesoporous STO prepared by CMC-controlled degradation of RhB MB mixed binary dyes has a higher selectivity to MB and the ratio of the first order kinetic constant of MB to RhB reaches 3.50 ~ 10 nm pore size, and the mesoporous STO has a more biased and selective degradation of MB. (3) in order to improve the photocatalytic degradation activity of STO, the doping of Fe and Ag and the modification of amorphous Pd-Ni-P were carried out to reduce the band gap of the products. After modification, the degradation rate of Mo increased by 30% and 40%, respectively, and the modification of Pd-Ni-P changed the surface state of STO, and the alloy promoted the degradation of MO. (4) the pH and the type of dyes were taken as variables. The degradation model of binary dyes was obtained by using 味 potential and molecular orbital LUMO-Homo value of dyes. It is explained that RhB-sensitized STO and STO-sensitized MB promote the separation of carriers. The phenomenon of increasing kinetic constant caused by pH change was explained by cyclic voltammetry, and the degradation sequence of dye was obtained, which indicated that the change of H concentration affected the competitive adsorption of dye molecule with H. The oxidation potential of dye molecule decreases.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X703;O643.36

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 喻洋;佟明興;何玉蘭;陳輝;高靜;李國(guó)華;;介孔TiO_2/WO_3空心球的制備及其可見光光催化性能[J];無機(jī)材料學(xué)報(bào);2017年04期

2 夏盛杰;邵蒙蒙;薛繼龍;倪哲明;;含Ce水滑石基復(fù)合氧化物對(duì)混合染料的光催化性能[J];無機(jī)化學(xué)學(xué)報(bào);2016年06期

3 張璐璐;孫悅;王U，

本文編號(hào)：2071550