奈米碳材料之合成與吸附特性研究

Synthesis and Adsorption Properties of Nano-carbon Materials

陳榮輝(Jung-Hui Chen) ； 陸柏佑(Po-Yu Lu) ； 俞仁渭(Jen-Wei Yu) ； 周聖迪(Sheng-Dy Chou) ； 陳偉徵(Wei-Jane Chen)

《高雄師大學報：自然科學與科技類》 37期 (2014/12) Pp. 21-40

摘要

本文利用石墨烯的高比表面積來吸附染料，且藉此與傳統活性碳（石墨粉）比較吸　附特性的差異，進一步我們使用幾種不同製備方法（鎂粉燃燒法、微波還原法、氫氧化鈉還原法）製備的石墨烯，此四個材料樣品皆使用1.傅立葉轉換紅外線光譜（Fourier transform infrared spectroscopy）、2.熱重量分析圖譜（Thermogravimetric analysis）、3.粉末式X射線繞射儀（Powder X-ray diffractometer）、4.拉曼光譜（Raman spectroscopy），分析材料特性。石墨烯因為表面積較大，因此會形成原理中所描述的化學吸附，活性碳則為物理吸附。石墨烯三個樣品的吸附量都可以吸附至約500mg/g（每克的吸附劑吸附染料克數），且吸附移除率隨著濃度的提升，有明顯的下降趨勢。而活性碳有幾個特性：第一點是吸附量會隨著濃度的升高而穩定提升。第二是移除率穩定的在15%上下。從這兩點可以顯見，活性碳不會因為吸附飽和的現象，導致吸附能力有下降的趨勢，但也不會因為初始濃度改變，而會有吸附量增加的狀況。在這個研究後，還有數個可延展研究之方向，例如以時間、溫度、pH值、離子強度為變因，觀察物理吸附和化學吸附在這些變因下會有何種差異，進而探討這些差異下為何會造成這些改變。

關鍵字

石墨烯 ； 活性碳 ； 吸附動力學

並列摘要

In this study we applied the property, high specific surface area, of graphene to adsorb dye, methylene blue. The adsorption behavior of graphene was compared with the adsorption behavior of conventional activated carbon (graphite). Also, the adsorption behaviors of graphene from different sources were compared and discussed in detail. Three samples of graphene were prepared from different methods (burning magnesium, microwave reduction, and, Sodium hydroxide reduction method). These three material samples and conventional activated carbon were characterized and analyzed by Fourier transform infrared spectroscopy, thermal gravimetric analysis, powder X-ray diffraction, and Raman spectroscopy. From the experimental results, we find that the adsorption behavior of the three samples of graphene is chemical adsorption. However, the adsorption behavior of conventional activated carbon is physically adsorbed. Three samples of graphene adsorbed dye can reach about 500mg/g (dye adsorbed per gram of adsorbent in grams) and the adsorption removal ratio with the dye initial concentration upgrading of the concentration of a significant downward trend. The activated carbon is observed that the adsorption capacity increases as the dye concentration will stably enhance and the removal ratio is stable at 15%. After this study, the effects of other experimental conditions, such as time, temperature, pH, and, ionic strength, on adsorption behavior will be analyzed and discussed in detail.

並列關鍵字

Graphene ； activated carbon ； adsorption kinetics