本文選題：酸洗廢液 + 反向共沉淀法��； 參考：《哈爾濱師范大學(xué)》2015年碩士論文

【摘要】：本文以酸洗廢液為原料,采用反向共沉淀法制備了納米四氧化三鐵,并通過XRD、TEM、FT-IR和TG-DSC等方法對(duì)所制備的氧化鐵材料進(jìn)行了表征,結(jié)果表明,制得的納米材料為粒徑為25 nm,立方體狀的納米四氧化三鐵粒子。探討了分散劑種類、分散劑用量、反應(yīng)過程中的pH值,反應(yīng)溫度和反應(yīng)時(shí)間等因素對(duì)材料的形貌及尺寸的影響,確定了由酸洗廢液制備納米四氧化三鐵的最佳工藝條件:以10 mL PEG-400為分散劑,反應(yīng)過程中pH值為10,80℃水浴條件下反應(yīng)4 h。通過ICP-MS測(cè)定,確定了在最佳工藝條件下制得的氧化鐵材料的純度為99.15%,基本為單相的納米四氧化三鐵材料。磁性測(cè)量的結(jié)果表明,四氧化三鐵可達(dá)到磁飽和強(qiáng)度M(s)為82.12 emu/g,矯頑力H(c)為149.20 Oe,剩磁M(s)為17.09emu/g。選擇最佳工藝條件下制備的納米四氧化三鐵作為催化劑,對(duì)苯甲醇催化氧化制備苯甲醛反應(yīng)進(jìn)行了評(píng)價(jià),實(shí)攪拌器攪拌4 h時(shí)苯甲醛的轉(zhuǎn)化率能夠達(dá)到41.24%,選擇性可以達(dá)到83.07%。而且,由于納米四氧化三鐵具有超順磁性,對(duì)催化劑采用磁分離的手段進(jìn)行回收及重復(fù)利用性能進(jìn)行了嘗試。結(jié)果表明,納米四氧化三鐵催化該反應(yīng)中可以重復(fù)使用四次時(shí)催化活性基本沒有顯著的改變,說明該催化劑利用磁性分離進(jìn)行回收、重復(fù)利用的性能優(yōu)良。
[Abstract]:In this paper, nanocrystalline ferric oxide was prepared by reverse coprecipitation from acid pickling waste liquor. The prepared ferric oxide materials were characterized by XRDD-TEMT-IR and TG-DSC.The nanocrystalline materials are cubic iron trioxide nanoparticles with a particle size of 25 nm.The effects of kinds of dispersant, amount of dispersant, pH value in the reaction process, reaction temperature and reaction time on the morphology and size of the material were discussed.The optimum conditions of preparing nanometer ferric oxide from pickling waste liquor were determined as follows: 10 mL PEG-400 was used as dispersant and pH value was 1080 鈩，

本文編號(hào)：1763516