本文關(guān)鍵詞：石墨烯基復(fù)合材料的制備及其光催化與吸附性能研究　出處：《安徽大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 石墨烯 二硫化鉬 復(fù)合材料 光催化 吸附

【摘要】：近年來,環(huán)境污染問題已經(jīng)成為了人類必須面對(duì)的主要問題。如何高效解決水污染問題已經(jīng)引起了人們廣泛的關(guān)注。迄今為止,人類已經(jīng)采用了很多先進(jìn)的技術(shù)用來處理污水中的有機(jī)染料和重金屬離子,比如共沉淀,電滲析,絮凝,離子交換,反滲透和吸附等。在這些方法當(dāng)中,光催化和吸附是最有效的方法,因?yàn)檫@兩種方法易于操作,成本低,效益高,并且能夠廣泛使用。石墨烯基材料作為一種新型的復(fù)合材料,因具有表面積大,電子傳輸性能優(yōu)異、綠色廉價(jià)等優(yōu)點(diǎn),受到了廣大科研工作者們的青睞,被廣泛應(yīng)用于光催化降解和吸附等領(lǐng)域�；诖�,本文首先制備得到巰基乙胺修飾的氧化石墨烯(GO-SH),然后在GO-SH表面負(fù)載上Fe3O4納米粒子得到磁性的GO-SH-/Fe3O4材料,并研究了 GO-SH/Fe3O4吸附水溶液中Ag+的性能;采用一步水熱法制備摻雜不同比例二硫化鉬(MoS2)的MoS2rRGO復(fù)合水凝膠,重點(diǎn)研究了 MoS2-RGO復(fù)合水凝膠對(duì)有機(jī)染料亞甲基藍(lán)(MB)的光催化降解性能,并且也進(jìn)行了部分電化學(xué)性能的研究;采用一步水熱法將GO溶液,MoS2溶液和殼聚糖(CS)溶液一步制得GO-MoS2-CS復(fù)合水凝膠,研究了該復(fù)合水凝膠對(duì)MB的吸附性能。本課題的主要研究內(nèi)容及結(jié)論如下:1.第一步,采用改進(jìn)的Hummers法合成了 GO,然后用巰基乙胺和石墨烯上的羧基進(jìn)行反應(yīng),得到GO-SH。接著,用共沉淀法在GO-SH表面負(fù)載上Fe304納米粒子。通過FT-IR、TGA、TEM和XPS等測(cè)試方法對(duì)GO-SH/Fe3O4復(fù)合材料進(jìn)行了表征。最后,研究了 GO-SH/Fe304吸附Ag+的性能。結(jié)果表明GO-SH對(duì)Ag+的平衡吸附量為68.2 mg·g-1,而未改性的GO對(duì)Ag+的平衡吸附量為40.3 mg·g-1。實(shí)驗(yàn)結(jié)果表明,GO-SH對(duì)Ag+的吸附效果比GO對(duì)Ag+的吸附效果好。而且,GO-SH/Fe3O4復(fù)合材料具有良好的超順磁性,這表明GO-SH/Fe3O4吸附劑可以很方便的進(jìn)行回收處理。2.采用氧化還原法制備得到GO,用鋰離子插層法制備得到片層的MoS2。隨后采用一步水熱法制備摻雜不同比例的MoS2-RGO復(fù)合水凝膠。重點(diǎn)研究了MoS2-RGO復(fù)合水凝膠對(duì)MB的光催化降解性能,并且也進(jìn)行了部分電化學(xué)性能的研究。結(jié)果表明MoS2和GO在水凝膠中分散的很好。MoS2-GO復(fù)合水凝膠對(duì)MB溶液具有很好的光催化降解性能(60 min降解率達(dá)到99%)。這是因?yàn)镸oS2的引入提高了光生電子的數(shù)量;石墨烯作為一個(gè)優(yōu)良的導(dǎo)體,可以及時(shí)地轉(zhuǎn)移走光催化過程中的光生電子,使得光生電子-空穴對(duì)重新復(fù)合的幾率大大降低了。3.首先,制備出片層的GO和MoS2。然后采用一步水熱法將GO溶液,MoS2溶液和CS溶液一步制得GO-MoS2-CS復(fù)合水凝膠,并用FT-IR、SEM、TGA和XRD等對(duì)其進(jìn)行了表征。研究了該復(fù)合水凝膠對(duì)MB溶液的吸附性能,結(jié)果表明GO-MoS2和GO-MoS2-CS復(fù)合水凝膠對(duì)MB的平衡吸附量分別為136.01 mg/g和206.16 mg/g。這說明GO-MoS2-CS復(fù)合水凝膠對(duì)MB具有更好的吸附性能。經(jīng)過兩次循環(huán)之后,GO-MoS2-CS復(fù)合水凝膠對(duì)MB的吸附量仍能達(dá)到初始平衡吸附量的73%。由于MoS2具有的光催化性能,而GO又可以及時(shí)的轉(zhuǎn)移光生電子,提高M(jìn)oS2的催化性能,這就使得該復(fù)合水凝膠在光照下就可以降解其吸附的MB,代替了傳統(tǒng)吸附劑需要用酸性或堿性溶液進(jìn)行解吸附。該操作簡單綠色,便于吸附劑循環(huán)利用。
[Abstract]:In recent years, the problem of environmental pollution has become the main problem that human beings have to face. How to efficiently solve the water pollution problem has attracted extensive attention. So far, humans have adopted a lot of advanced technology for treatment of organic dyes and heavy metal ions in wastewater, such as precipitation, electrodialysis, flocculation, ion exchange. Reverse osmosis and adsorption. Among these techniques, photocatalytic and adsorption is the most effective method, because these two kinds of method is easy to operate, low cost, high efficiency, and can be widely used. Graphene based materials as a new type of composite material, because of its large surface area, excellent electronic transmission performance, green cheap and other advantages, by the majority of researchers of all ages, has been widely used in photocatalytic degradation and adsorption fields. Based on this, this paper first made of graphite oxide prepared by amine modified Qiu Jiyi Graphene (GO-SH), and Fe3O4 on the surface of GO-SH nanoparticles by GO-SH-/Fe3O4 load magnetic materials, and studied the properties of GO-SH/Fe3O4 adsorption of Ag+ in aqueous solution; a one-step hydrothermal method to prepare doped with different proportion of molybdenum disulfide (MoS2) MoS2rRGO composite hydrogel, with emphasis on the MoS2-RGO composite hydrogel of methylene blue (MB) the photocatalytic degradation was also studied, and some electrochemical properties; a one-step hydrothermal method, GO solution, MoS2 solution and chitosan (CS) solution to prepare the GO-MoS2-CS composite hydrogel, the adsorption properties of the composite hydrogels of MB. The main research contents and conclusions of this paper. The first step is as follows: 1., GO was synthesized by the improved Hummers method, and then the reaction with cysteamine and carboxyl groups on graphene, GO-SH. and Fe304 by co precipitation method on the surface of GO-SH load Nanoparticles. Through FT-IR, TGA, TEM and XPS test were used to characterize the GO-SH/Fe3O4 composites. Finally, performance of GO-SH/Fe304 was studied. The results showed that the adsorption of Ag+ GO-SH on the equilibrium adsorption amount of Ag+ was 68.2 Mg - g-1, and unmodified GO the equilibrium adsorption amount of Ag+ was 40.3 Mg - g-1. test the results show that the adsorption effect of GO-SH on the Ag+ than the GO adsorption on Ag+. Moreover, GO-SH/Fe3O4 composite material has good superparamagnetism, which indicates that the GO-SH/Fe3O4 adsorbent can be very convenient for the recovery and treatment of.2. were prepared by redox GO lithium ion intercalation prepared slices of MoS2. MoS2-RGO then the composite hydrogel preparation with different doping proportion by one-step hydrothermal method. Focus on the photocatalytic degradation properties of MoS2-RGO composite hydrogels of MB, and also studied some electrochemical properties. The results showed that Mo S2 and GO in the hydrogel theallotted.MoS2-GO composite hydrogel have good photocatalytic properties of MB solution (60 min degradation rate reached 99%). This is because the introduction of MoS2 increased the number of photogenerated electrons; graphene as a good conductor, can timely transfer light catalytic process the photogenerated electrons, the photogenerated electron hole pairs recombination probability greatly reduces the.3. first, prepared slices of GO and MoS2. and then by one-step hydrothermal method GO solution, MoS2 solution and CS solution to prepare the GO-MoS2-CS composite hydrogel, and the use of FT-IR, SEM, the characterized by TGA and XRD. The adsorption properties of the composite hydrogel of MB solution, the results showed that the GO-MoS2 and GO-MoS2-CS composite hydrogel and the equilibrium adsorption amount of MB was 136.01 mg/g and 206.16 mg/g., which indicates that the GO-MoS2-CS composite hydrogel has better on MB Adsorption performance. After two cycles, the adsorption amount of GO-MoS2-CS composite hydrogel of MB still can reach the initial equilibrium adsorption amount of 73%. due to the photocatalytic performance of MoS2 has, and GO can timely transfer of photogenerated electrons, improve the catalytic performance of MoS2, which makes the compound water gel can be under illumination the degradation of adsorbed MB, instead of the traditional adsorbent to desorption with acid or alkaline solution. The operation is simple and convenient green adsorbent recycling.

【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33;O647.33

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