本文選題：水熱法 + 鐵氧化物　； 參考：《重慶理工大學(xué)》2017年碩士論文

【摘要】：本文采用低成本鐵源、碳源和沉淀劑為原料,通過水熱法制備得到Fe_3O_4@C、α-Fe_2O_3/γ-AlOOH和Fe_3O_4三種納米材料。對所得樣品進(jìn)行了表征,探討原料配比和反應(yīng)溫度對所得產(chǎn)物的重金屬離子Cr(VI)和剛果紅吸附性能,主要研究內(nèi)容如下:(1)以氯化鐵、環(huán)狀糊精和尿素為原料進(jìn)行水熱反應(yīng),當(dāng)環(huán)狀糊精為3mmol,氯化鐵與尿素摩爾比為1:0.75-6時(shí),200℃保溫12h,得到Fe_3O_4純相;摩爾比為1:0.75時(shí)生成有無定形碳?xì)ぐ驳暮藲ば虵e_3O_4@C復(fù)合材料,比表面積為23.07m~2/g,對Cr(VI)和剛果紅的吸附質(zhì)量為10.06mg/g和88.20mg/g。以硝酸鐵、環(huán)狀糊精和尿素為原料進(jìn)行水熱反應(yīng),當(dāng)尿素為30mmol,硝酸鐵與環(huán)狀糊精摩爾比為1:0.15-1.2時(shí),200℃反應(yīng)12h,得到Fe_3O_4純相;摩爾比為1:0.3時(shí)的產(chǎn)物Fe_3O_4@C為核殼型結(jié)構(gòu),比表面積為112.91m~2/g。準(zhǔn)二級動(dòng)力學(xué)模型與Freundlich模型能較好的描述該樣品對剛果紅和Cr(VI)的吸附行為,計(jì)算得到對Cr(VI)和剛果紅的最大吸附量為33.35mg/g和262.72mg/g。(2)以氯化鐵、尿素和葡萄糖為原料進(jìn)行水熱反應(yīng),當(dāng)葡萄糖為2mmol,氯化鐵、尿素摩爾比為1:0.75-3時(shí),200℃保溫12h,得到純相Fe_3O_4;摩爾比為1:1.5時(shí)產(chǎn)物中存在無定形碳結(jié)構(gòu),比表面積為39.64m~2/g,對Cr(VI)的吸附質(zhì)量為12.69mg/g。以硝酸鐵、尿素和葡萄糖為原料進(jìn)行水熱反應(yīng),當(dāng)葡萄糖為2mmol,硝酸鐵、尿素摩爾比為1:0.75-3時(shí),200℃保溫12h,得到Fe_3O_4純相;摩爾比為1:1.5時(shí)對應(yīng)產(chǎn)物的Cr(VI)吸附質(zhì)量為21.14mg/g,比表面積為85.70m~2/g。Fe3+和部分還原得到的Fe2+在溫和沉淀離子OH-的作用下,反應(yīng)生成Fe_3O_4顆粒,隨后碳源碳化反應(yīng)的碳沉積在粒子的表面,累積到一定程度厚度不再增加,最終形成核殼結(jié)構(gòu)的Fe_3O_4@C。(3)以硝酸鐵、硝酸鋁和尿素為原料進(jìn)行水熱反應(yīng),研究了鐵源/鋁源摩爾比與尿素含量對產(chǎn)物物相及吸附性能的影響。當(dāng)2.5mmol尿素,鐵源與鋁源摩爾比為1:0.33-4時(shí),180℃保溫12h,得到α-Fe_2O_3/γ-AlOOH復(fù)合材料;鐵源/鋁源摩爾比為1:4時(shí),所得樣品對剛果紅的飽和吸附質(zhì)量為99.66mg/g。(4)以硝酸鐵、尿素和CTAB為原料進(jìn)行水熱反應(yīng),研究了硝酸鐵含量對產(chǎn)物物相及吸附性能的影響。當(dāng)CTAB為1.1mmol,硝酸鐵、尿素摩爾比為1:0.25-1時(shí),200℃保溫12h,得到Fe_3O_4純相;硝酸鐵、尿素摩爾比為1:1時(shí),產(chǎn)物Fe_3O_4的剛果紅吸附質(zhì)量分別為99.17mg/g。
[Abstract]:In this paper, using low-cost Tie Yuan, carbon source and precipitator as raw materials, three kinds of nanomaterials, FeSZ _ 3O _ 4C, 偽 -Fe _ 2O _ 3 / 緯 -AlOOH and Fe_3O_4, were prepared by hydrothermal method.The properties of heavy metal ions CrVI and Congo red adsorbed by raw material ratio and reaction temperature were studied. The main contents of the study were as follows: ferric chloride, cyclodextrin and urea were used as raw materials for hydrothermal reaction.When the cyclodextrin is 3 mmol and the molar ratio of ferric chloride to urea is 1: 0.75-6, the pure phase of Fe_3O_4 is obtained at 200 鈩，

本文編號：1757814