【摘要】：隨著染料工業(yè)的迅速發(fā)展,染料廢水所帶來(lái)的環(huán)境污染日趨嚴(yán)重。當(dāng)染料廢水排入水體時(shí),會(huì)對(duì)水質(zhì)、水體生物、人體健康和生態(tài)造成巨大危害。吸附法因其具有處理效率高、適應(yīng)性強(qiáng)、易操作等特點(diǎn),在實(shí)際應(yīng)用中得到廣泛的關(guān)注。石墨烯是一種新型的碳納米材料,具有高的比表面積、出眾的電學(xué)性能和奇特的力學(xué)性能等特點(diǎn),在吸附領(lǐng)域展現(xiàn)了巨大的潛力。本文采用常見(jiàn)的Hummer方法制備了氧化石墨烯,在此基礎(chǔ)上采用改進(jìn)的液相還原法把納米零價(jià)鐵負(fù)載在氧化石墨烯上制成氧化石墨烯納米鐵復(fù)合材料,通過(guò)掃描電鏡(SEM)、X射線衍射分析儀(XRD)、Zeta電位儀和比表面積分析儀對(duì)其進(jìn)行了表征。運(yùn)用這種復(fù)合材料作為吸附劑去除水中的的陽(yáng)離子染料亞甲基藍(lán)和陰離子染料甲基橙,在吸附過(guò)程中研究了溶液p H、初始質(zhì)量濃度、反應(yīng)時(shí)間、反應(yīng)溫度對(duì)兩種染料的吸附影響,為石墨烯的環(huán)境應(yīng)用提供了理論依據(jù)。論文的主要內(nèi)容有:(1)以石墨粉為原料,采用Hummer法和液相還原法制備復(fù)合吸附劑。由SEM圖片可知,納米零價(jià)鐵以球形或短鏈形負(fù)載在氧化石墨烯上,增加了材料的反應(yīng)活性位點(diǎn);XRD圖譜顯示納米零價(jià)鐵成功地負(fù)載到氧化石墨烯上;Zeta電位測(cè)得氧化石墨烯負(fù)載納米零價(jià)鐵的等電點(diǎn)為3;氮吸附-解吸實(shí)驗(yàn)測(cè)得復(fù)合吸附劑的比表面積為158.32 m2/g。(2)探究氧化石墨烯負(fù)載納米零價(jià)鐵吸附亞甲基藍(lán)過(guò)程中的影響因素。吸附最佳p H值為6;吸附最佳反應(yīng)溫度為25℃;Langmuir和Frenudlich兩種等溫吸附模型都能很好地描述復(fù)合材料對(duì)亞甲基藍(lán)的吸附過(guò)程,最大吸附容量為201.2 mg/g;吸附過(guò)程符合準(zhǔn)二級(jí)動(dòng)力學(xué)模型,在5 h內(nèi)基本達(dá)到吸附平衡。(3)探究氧化石墨烯負(fù)載納米零價(jià)鐵吸附甲基橙過(guò)程中的影響因素。吸附最佳p H值為2;吸附最佳反應(yīng)溫度為40℃;Langmuir和Frenudlich兩種等溫吸附模型都能很好地描述復(fù)合材料對(duì)甲基橙的吸附過(guò)程,最大吸附容量為53.289 mg/g;吸附過(guò)程符合準(zhǔn)二級(jí)動(dòng)力學(xué)模型,在1 h內(nèi)基本達(dá)到吸附平衡。
[Abstract]:With the rapid development of dyestuff industry, the environmental pollution caused by dyestuff wastewater is becoming more and more serious. When dye wastewater is discharged into water, it will cause great harm to water quality, water organism, human health and ecology. Because of its high treatment efficiency, adaptability and easy operation, adsorption method has been widely used in practical applications. Graphene is a new carbon nano-material with high specific surface area, outstanding electrical properties and unique mechanical properties, which shows great potential in adsorption field. In this paper, graphene oxide was prepared by common Hummer method. Based on this, graphite oxide nanocrystalline iron oxide composite was prepared by using modified liquid phase reduction method to load nano-zero valent iron onto graphene oxide. It was characterized by scanning electron microscope (SEM) (SEM), X ray diffraction analyzer (XRD), Zeta potentiometer and specific surface area analyzer. The composite was used as adsorbent to remove cationic dye methylene blue and anionic dye methyl orange from water. The solution pH, initial mass concentration and reaction time were studied during the adsorption process. The effect of reaction temperature on the adsorption of two dyes provides a theoretical basis for the environmental application of graphene. The main contents of this paper are as follows: (1) the composite adsorbent was prepared by Hummer method and liquid reduction method using graphite powder as raw material. SEM images show that nanocrystalline zero-valent iron is loaded on graphene oxide in spherical or short chain shape. The reaction activity sites of the materials were increased; the XRD spectra showed that the nano-zero-valent iron was successfully loaded onto graphene oxide; the isoelectric point of graphene oxide supported nano-zero-valent iron was measured by Zeta potential; and the compound absorption was obtained by nitrogen adsorption-desorption experiment. The specific surface area of the adsorbent is 158.32 m2 / g. (2) the factors affecting the adsorption of methylene blue by graphene oxide supported on nanometer zero-valent iron are investigated. The best adsorption pH value is 6 and the optimum adsorption temperature is 25 鈩，

本文編號(hào)：2292348