本文選題：聚合硫酸鐵 + 鈣基改性　； 參考：《湖北工業(yè)大學(xué)》2017年碩士論文

【摘要】：本論文探討了用雙氧水氧化制備聚合硫酸鐵(PFS)并用鈣鹽對(duì)PFS進(jìn)行改性的實(shí)驗(yàn)過(guò)程�？疾炝肆蛩嵊昧�、過(guò)氧化氫用量、反應(yīng)溫度和反應(yīng)時(shí)間等因素對(duì)聚合硫酸鐵主要成分(全鐵含量、Fe2+含量及鹽基度)指標(biāo)的影響。同時(shí),在此基礎(chǔ)上,對(duì)上述合成的質(zhì)量?jī)?yōu)良的PFS進(jìn)行鈣鹽改性,并采用響應(yīng)曲線面優(yōu)化設(shè)計(jì)法,創(chuàng)建Box-Behnken數(shù)學(xué)模型,考察Ca/Fe摩爾比、反應(yīng)溫度和時(shí)間對(duì)合成產(chǎn)物成分(全鐵含量、Fe2+含量及鹽基度)的影響,從而得到質(zhì)量較好的鈣基聚合硫酸鐵(CaPFS)。借助傅立葉變換紅外光譜圖、掃描電鏡照片觀察了PFS及CaPFS的結(jié)構(gòu)與形貌,并進(jìn)一步考察了本論文合成聚合硫酸鐵(Z-PFS)、鈣基聚合硫酸鐵(CaPFS)和市場(chǎng)常用的聚合硫酸鐵(S-PFS)對(duì)富磷底泥的固磷脫水效果。通過(guò)制備PFS、CaPFS的實(shí)驗(yàn)過(guò)程研究,得到以下結(jié)論:1.實(shí)驗(yàn)通過(guò)對(duì)硫酸、過(guò)氧化氫、反應(yīng)溫度和時(shí)間四個(gè)因素優(yōu)化,確定:n[SO42-]/n[Fe]T=1.3,n[H2O2]/n[Fe]T=0.70,反應(yīng)溫度和時(shí)間分別為50℃、5h,得到產(chǎn)品全鐵含量為12.58%,Fe2+含量為0.002%,鹽基度為13.84%,為最佳質(zhì)量產(chǎn)品。2.實(shí)驗(yàn)采取響應(yīng)曲面設(shè)計(jì)并按照現(xiàn)實(shí)條件獲得最好合成鈣基聚合硫酸鐵條件:反應(yīng)溫度、時(shí)間和Ca/Fe摩爾比分別為62℃、7h、0.05。所得產(chǎn)品全鐵量和鹽基度平均值在13.82%和17.95%。經(jīng)實(shí)驗(yàn)驗(yàn)證,全鐵量和鹽基度測(cè)得值與模型預(yù)測(cè)值偏差僅為0.84%和0.47%。同時(shí),實(shí)驗(yàn)借助傅立葉變換紅外光譜、與SEM分析表征手段觀察了CaPFS的結(jié)構(gòu)與形貌,顯示制備的CaPFS為鐵與羥基橋聯(lián)的聚鐵類產(chǎn)物。3.與市售的PFS比較發(fā)現(xiàn):在投加量為4.78μg/g時(shí),CaPFS和市售的PFS調(diào)理后的底泥,比阻值均達(dá)到最低,此時(shí)n(Ca)/n(Fe)=0.05的CaPFS比阻值下降到0.40×1012m/kg,市售的PFS比阻下降至0.96×1012m/kg;同時(shí)n(Ca)/n(Fe)=0.05的CaPFS處理后底泥上清液磷濃度為0.08mg/L,沉泥濾液中磷濃度為0.44 mg/L,均低于被市售的PFS處理的(0.23mg/L,0.59 mg/L),對(duì)應(yīng)的94.84%和87.34%的磷被固持于底泥之中。以上顯示CaPFS提升底泥脫水能力及固磷效能優(yōu)于市售的PFS。
[Abstract]:In this paper, the experimental process of PFS modified by calcium salt was studied. The effects of the amount of sulfuric acid, hydrogen peroxide, reaction temperature and reaction time on the main components (total iron content, Fe _ 2 content and basicity) of polyferric sulfate were investigated. At the same time, on the basis of this, the PFS with excellent quality was modified by calcium salt, and the Box-Behnken mathematical model was established by using the optimum design method of response curve surface, and the molar ratio of Ca/Fe was investigated. The effect of reaction temperature and time on the composition of the synthesized product (total iron content, Fe _ 2 content and basicity) was investigated, and a better quality calcium polyferric sulfate (CaPFS) was obtained. The structure and morphology of PFS and CaPFS were observed by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The dewatering effects of synthetic polyferric sulfate Z-PFS, calcium based polyferric sulfate (CaPFS) and polymeric ferric sulfate S-PFS on phosphorus-rich sediment were further investigated. The experimental process of preparing PFS- CaPFS was studied, and the following conclusions were obtained: 1. 1. Through the optimization of sulfuric acid, hydrogen peroxide, reaction temperature and time, it was determined that: n [so _ 42-] / n [Fe] _ T _ (3) N [H2O2] / n [Fe] T _ (0. 70), reaction temperature and time were 50 鈩，

本文編號(hào)：1930874