Fe-TiO_2/rGO奈米複合材料之合成與物性探討及吸附、降解甲基橙之動力學研究

Synthesis, Characterization and Kinetics of Adsorption and Degradation of Methyl Orange of Fe-TiO_2/rGo Nanocomposites

陳榮輝(Jung-Hui Chen) ； 許雅筠(Ya-Yun Hsu) ； 謝貞頤(Chen-Yi Hsieh) ； 王銘徽(Minh-Hui Wang) ； 陳偉徵(Wei-Jane Chen) ； 施伶宜(Lin-Yi Shih)

《高雄師大學報：自然科學與科技類》 38期 (2015/06) Pp. 1-27

摘要

近幾年來，石墨烯為主的材料越來越熱門，以石墨烯為基底的複合材料，也漸漸地被廣泛應用，像是Fe_2O_3/graphene、Fe_3O_4/graphene、TiO_2/graphene 等等。但是將石墨烯同時與兩種以上的金屬接在一起的研究並不多，所以本研究參考Hong等人的方法，加以改良調整，製備出Fe-TiO_2/rGO。本研究以低成本的石墨粉經由Hummers法，氧化成氧化石墨烯，再以實驗條件好控制的溶膠凝膠法合成Fe-TiO_2，最後以較低溫的水熱法製備合成出Fe-TiO_2/rGO。所合成出來的Fe-TiO_2/rGO 複合材料，以FT-IR、XRD、TGA、UV-Visible分別鑑定其官能基結構、晶型結構、熱性質及光學性質。由光譜圖顯示，本研究成功地合成出Fe-TiO_2/rGO複合材料，且TiO_2晶型為銳鈦礦。以Fe-TiO_2/rGO吸附甲基橙溶液，並改變吸附劑用量、pH值及攪拌速率。由實驗結果可以得知，Fe-TiO_2/rGO吸附甲基橙溶液的動力學為二級反應。k值會隨著吸附劑用量及攪拌速率增加而提升，在酸性環境下的k值比鹼性大，但q_e值不會因為這三種變因而有所影響。以365nm波長做Fe-TiO_2/rGO及TiO_2光降解實驗，比用254nm波長的降解效果好，Fe-TiO_2/rGO複合材料的光降解反應動力學亦為二級反應，且k值為6950(L．mol^(-1)．s^(-1))。

關鍵字

甲基橙 ； 吸附 ； 降解

並列摘要

In recent years, graphene-based materials have become increasingly popular. Graphene-based composites have gradually been widely used, such as Fe_2O_3/graphene, Fe_3O_4/graphene, TiO_2/grapheme. But, not much is written about the study of grapheme simultaneously with two or more metals together. Therefore, this study referenced Zhanglian's method to improve and adjust to prepare Fe-TiO_2/rGO.In this study, graphite, which is low-cost, was oxidized by Hummers method into graphene oxide. Then, Fe-TiO_2 was synthesized by sol-gel method which is good control of the experimental conditions. Finally, Fe-TiO_2/rGO was synthesized by hydrothermal method which is more low-temperature. Fe-TiO_2/rGO composites were identified in terms of their functional group, crystal structure, thermal properties and optical properties by FT-IR, XRD, TGA and UV-Visible. The spectrum displayed that Fe-TiO_2/rGO composites were successfully synthesized, and the crystalline of TiO_2 is anatase.Fe-TiO_2/rGO adsorbed methyl orange solution and change the amount of adsorbent, pH, and the stirring rate. The experimental results show that kinetics of Fe-TiO_2/rGO absorbing methyl orange solution is a secondary reaction. The k value enhanced when the amount of adsorbent and the stirring rate increased. The k values in acidic environment were larger than in basic environment. But, The qe values did not change for these three variables. Photodegradation effect of Fe-TiO_2/rGO and TiO_2 by 365nm wavelength was better than by 254nm wavelength. Kinetics of Fe-TiO_2/rGO composites degrade methyl orange solution is a secondary reaction, and the k value is 6950(L．mol^(-1)．s^(-1)).

並列關鍵字

Fe ； TiO_2 ； rGO ； methyl orange ； Adsorption ； degradatio