本文選題：3DGA + 3DGA-nZVI��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：石墨烯是近年來比較受歡迎的吸附材料,可是吸附完污染物后較難從水中收集和分離,以至于容易造成二次污染。而三維結(jié)構(gòu)的石墨烯(3DGA)疏松多孔,導(dǎo)致其比表面積更大,優(yōu)勢更顯著。納米零價鐵(nZVI)也是一種比較受熱捧的吸附材料,但是容易發(fā)生團聚和被氧化的狀況。本文結(jié)合這兩者的優(yōu)勢,彌補各自的不足,在探究出3DGA的制備方法并對其性能進行表征后,又對三維石墨烯-納米零價鐵(3DGA-nZVI)復(fù)合材料的制備、表征以及復(fù)合物對甲基橙和三氯乙烯(TCE)的吸附性能進行研究和分析。吸附實驗考察不同吸附條件的影響,并且分別用吸附動力學(xué)模型和等溫吸附模型來描述整個的吸附過程。全文通過對本實驗的分析總結(jié),得到如下結(jié)論:先通過經(jīng)過氧化還原法和冷凍干燥得到3DGA,再進行電鏡掃描(SEM)、傅里葉紅外光譜(FT-IR)、拉曼(Raman)、X射線(XRD)和BET比表面積的測試,證明了原材料氧化石墨烯(GO)中的含氧官能團大多數(shù)被去除,新制得的是有較大比表面積和較強的吸附能力并且材料內(nèi)部是多孔的三維結(jié)構(gòu)的特殊材料。實驗制得的3DGA比表面積達到65.34 m2/g,孔徑分布為3.939 nm,并且它具有很好的親油疏水的特性。再通過調(diào)節(jié)醇水比、PVP濃度以及液相還原法制備最佳的3DGA-n ZVI復(fù)合材料,對其做了SEM、FT-IR、Raman、XRD表征,可知復(fù)合材料的純凈度較高,類似粉末狀小顆粒物依然具有三維結(jié)構(gòu),而納米零價鐵也成功地負載在了3DGA上面,使其具有很好的磁性。然后在3DGA-nZVI復(fù)合材料對甲基橙的吸附實驗中,得出結(jié)論大概在135min即可到達平衡吸附,吸附最佳pH為2,在100mL濃度為10mg/L的甲基橙廢液中,投放0.07g 3DGA-nZVI復(fù)合材料即可達到89%以上的去除率,在25℃進行吸附效果會更好。而且其吸附過程切合準(zhǔn)一級動力學(xué)吸附和弗倫德里希吸附等溫模型。最后在3DGA-nZVI復(fù)合材料吸附TCE的實驗中,可以看出吸附最佳pH值為8,最快反應(yīng)30min即可達到較好的平衡狀態(tài),在25mL 10mg/L的TCE溶液中,投放0.015g的材料既可以到達91%以上的去除率,并且在溫度25℃是最有利于吸附降解反應(yīng)的進行的。同時該吸附過程符合二級動力學(xué)吸附和弗倫德里希吸附等溫模型。
[Abstract]:Graphene is a popular adsorption material in recent years, but it is difficult to collect and separate from water after adsorbing pollutants, so it is easy to cause secondary pollution. The three-dimensional structure of graphene 3DGA is porous, resulting in a larger specific surface area and a more significant advantage. Nanocrystalline zero-valent iron (NZVI) is also a popular adsorption material, but it is easy to reunite and be oxidized. In this paper, the advantages of these two methods are combined to make up for their shortcomings. After exploring the preparation method of 3DGA and characterizing its properties, the preparation of 3D graphene nano-zero valence iron oxide 3DGA-nZVI composite is studied. Characterization and adsorption of methyl orange and TCE-trichloroethylene were studied and analyzed. The effects of different adsorption conditions on adsorption were investigated and the adsorption process was described by adsorption kinetic model and isothermal adsorption model respectively. The results are as follows: first, 3DGA was obtained by redox method and freeze-drying, then the specific surface area of BET was measured by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman Raman Ramanine X-ray diffraction (XRD) and BET. It is proved that most of the oxygen-containing functional groups in the raw materials of graphene oxide (GOO) have been removed. The new materials have a large specific surface area and a strong adsorption capacity and the material interior is a porous three-dimensional structure of the special material. The specific surface area of 3DGA is 65.34 m2 / g, the pore size distribution is 3.939 nm, and it has a good hydrophobic property. The optimal 3DGA-n ZVI composite was prepared by adjusting the concentration of alcohol to water and the liquid phase reduction method. The results showed that the purity of the composite was high, and the similar powder particles still had three dimensional structure. Nanocrystalline zero-valent iron is also successfully loaded on 3DGA, which makes it magnetic. Then, in the experiment of adsorption of methyl orange by 3DGA-nZVI composite, it is concluded that equilibrium adsorption can be achieved in 135min, and the optimum pH is 2. In the waste liquid of methyl orange with 100mL concentration of 10mg/L, 0.07g 3DGA-nZVI composite can get more than 89% removal rate. It is better to adsorb at 25 鈩，

本文編號：1847718