改性氧化石墨烯吸附染料的性能研究
發(fā)布時間：2018-12-11 13:16
【摘要】：目前水體污染問題變得越來越嚴峻,染料廢水因具有難降解、化學(xué)結(jié)構(gòu)復(fù)雜、色度高等特點,使其處理困難。吸附法因操作簡單、處理效果好,成為處理染料廢水的主要方法。石墨烯基類改性材料作為一種新型吸附劑,已在染料廢水處理領(lǐng)域得到廣泛應(yīng)用。論文通過氫氧化鉀(KOH)高溫固相活化刻蝕氧化石墨烯(GO)的方法,獲得新的吸附材料-活化氧化石墨烯(GOKOH),以提高GO的比表面積。采用物理化學(xué)表征手段,包括X射線衍射儀(XRD)、傅里葉紅外光譜(FTIR)、比表面積測定儀(BET)、Zeta電位儀、掃描電鏡(SEM)等表征方法對活化前后的GO進行表征,分析活化前后形貌、結(jié)構(gòu)的變化。將活化前后的GO用于對甲基橙(MO)和橙黃IV吸附,并研究吸附性能及機理。本實驗研究的主要內(nèi)容和結(jié)果如下:(1)GOKOH表面的含氧官能團有所減少,比表面積增加到672.475 m2/g,孔隙率增加,表面負電荷減少,這些變化都有助于MO及橙黃IV的吸附。(2)合成GOKOH時,固體氧化石墨和KOH的質(zhì)量比為1:4時,GOKOH去除染料MO和橙黃IV的效果最佳;無論是GO還是GOKOH對于MO和橙黃IV的吸附效果都是在酸性條件下優(yōu)于堿性條件下。(3)MO和橙黃IV在GO及GOKOH上面的吸附結(jié)果表明,GOKOH吸附MO和橙黃IV的吸附容量分別為500.13 mg/g與524.09 mg/g,遠遠高于氧化石墨只經(jīng)過簡單的超聲分散得到的GO的吸附容量(113.98 mg/g和119.08 mg/g)。(4)實驗數(shù)據(jù)采用了吸附動力學(xué)進行了擬合,結(jié)果表明準二級動力學(xué)能夠較好的描述染料MO和橙黃IV在GO和GOKOH的吸附,且吸附過程均由多個階段組成。(5)運用了吸附等溫線模型中的Langmuir模型和Freundilich模型對吸附數(shù)據(jù)進行了線性擬合,Langmuir模型能夠較好闡述GO和GOKOH吸附MO與橙黃IV的整個吸附行為,MO和橙黃IV在GO上吸附采用Langmuir模型擬合出來的最大吸附容量分別是125.00 mg/g與137.56 mg/g,在GOKOH上的最大吸附容量分別是632.91 mg/g和606.061 mg/g,且兩種染料在GO和GOKOH上的吸附主要由單層吸附控制。(6)GOKOH吸附完MO后,還對GOKOH本身進行了循環(huán)多次再生利用,再生利用四次后對MO的吸附容量高達為第一次的55.1%,因此GOKOH作為一種新型材料,可以廣泛應(yīng)用于染料廢水處理工藝中。
[Abstract]:At present, the problem of water pollution becomes more and more serious. Dye wastewater is difficult to treat because of its characteristics of difficult degradation, complex chemical structure and high chroma. Adsorption method is the main method for dye wastewater treatment because of its simple operation and good treatment effect. As a new adsorbent, graphene modified materials have been widely used in dye wastewater treatment. In order to improve the specific surface area of graphene oxide (GO), a new adsorption material, activated graphene oxide (GOKOH), was obtained by high temperature solid phase activation of potassium hydroxide (KOH) to etch graphene oxide (GO). The GO before and after activation was characterized by means of physicochemical characterization, including X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), specific surface area measurement (BET), Zeta) potentiometer, scanning electron microscope (SEM), etc. The changes of morphology and structure before and after activation were analyzed. GO before and after activation was used to adsorb methyl orange (MO) and orange yellow IV, and the adsorption properties and mechanism were studied. The main contents and results of this experiment are as follows: (1) the oxygen functional groups on GOKOH surface decrease, the specific surface area increases to 672.475 m2 / g, the porosity increases and the surface negative charge decreases. These changes are helpful to the adsorption of MO and orange IV. (2) when the mass ratio of solid graphite oxide and KOH is 1:4, the removal of MO and orange IV by GOKOH is the best; Both GO and GOKOH have better adsorption effects on MO and orange IV than on alkaline conditions. (3) the adsorption results of MO and orange IV on GO and GOKOH show that: 1. The adsorption capacities of MO and orange IV by GOKOH were 500.13 mg/g and 524.09 mg/g, respectively. The adsorption capacity of GO (113.98 mg/g and 119.08 mg/g). (4) obtained by ultrasonic dispersion is much higher than that of graphite oxide. The adsorption kinetics is used to fit the experimental data. The results show that the quasi-second-order kinetics can well describe the adsorption of dye MO and orange IV on GO and GOKOH. The adsorption process is composed of several stages. (5) the adsorption data are fitted linearly by using the Langmuir model and Freundilich model in the adsorption isotherm model. The Langmuir model can better explain the whole adsorption behavior of GO and GOKOH adsorption MO and orange IV. The maximum adsorption capacities of MO and orange IV on GO by Langmuir model are 632.91 mg/g and 606.061 mg/g, respectively, which are 125.00 mg/g and 137.56 mg/g, on GOKOH, respectively. The adsorption of the two dyes on GO and GOKOH was mainly controlled by monolayer adsorption. (6) after the MO was adsorbed by GOKOH, the GOKOH itself was reused for several times, and the adsorption capacity of MO was up to 55.1% of that of the first one. Therefore, as a new material, GOKOH can be widely used in dye wastewater treatment process.
【學(xué)位授予單位】：蘇州科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X788;O647.3
本文編號：2372617
[Abstract]:At present, the problem of water pollution becomes more and more serious. Dye wastewater is difficult to treat because of its characteristics of difficult degradation, complex chemical structure and high chroma. Adsorption method is the main method for dye wastewater treatment because of its simple operation and good treatment effect. As a new adsorbent, graphene modified materials have been widely used in dye wastewater treatment. In order to improve the specific surface area of graphene oxide (GO), a new adsorption material, activated graphene oxide (GOKOH), was obtained by high temperature solid phase activation of potassium hydroxide (KOH) to etch graphene oxide (GO). The GO before and after activation was characterized by means of physicochemical characterization, including X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), specific surface area measurement (BET), Zeta) potentiometer, scanning electron microscope (SEM), etc. The changes of morphology and structure before and after activation were analyzed. GO before and after activation was used to adsorb methyl orange (MO) and orange yellow IV, and the adsorption properties and mechanism were studied. The main contents and results of this experiment are as follows: (1) the oxygen functional groups on GOKOH surface decrease, the specific surface area increases to 672.475 m2 / g, the porosity increases and the surface negative charge decreases. These changes are helpful to the adsorption of MO and orange IV. (2) when the mass ratio of solid graphite oxide and KOH is 1:4, the removal of MO and orange IV by GOKOH is the best; Both GO and GOKOH have better adsorption effects on MO and orange IV than on alkaline conditions. (3) the adsorption results of MO and orange IV on GO and GOKOH show that: 1. The adsorption capacities of MO and orange IV by GOKOH were 500.13 mg/g and 524.09 mg/g, respectively. The adsorption capacity of GO (113.98 mg/g and 119.08 mg/g). (4) obtained by ultrasonic dispersion is much higher than that of graphite oxide. The adsorption kinetics is used to fit the experimental data. The results show that the quasi-second-order kinetics can well describe the adsorption of dye MO and orange IV on GO and GOKOH. The adsorption process is composed of several stages. (5) the adsorption data are fitted linearly by using the Langmuir model and Freundilich model in the adsorption isotherm model. The Langmuir model can better explain the whole adsorption behavior of GO and GOKOH adsorption MO and orange IV. The maximum adsorption capacities of MO and orange IV on GO by Langmuir model are 632.91 mg/g and 606.061 mg/g, respectively, which are 125.00 mg/g and 137.56 mg/g, on GOKOH, respectively. The adsorption of the two dyes on GO and GOKOH was mainly controlled by monolayer adsorption. (6) after the MO was adsorbed by GOKOH, the GOKOH itself was reused for several times, and the adsorption capacity of MO was up to 55.1% of that of the first one. Therefore, as a new material, GOKOH can be widely used in dye wastewater treatment process.
【學(xué)位授予單位】：蘇州科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X788;O647.3
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