rGO/CS/ZnO奈米複合材料之合成、物性及吸附與降解亞甲藍動力學之研究

Preparation, Characterization and Kinetics of Adsorption and Degradation of Methylene Blue of rGO/CS/ZnO Nanocomposite

陳榮輝(Jung-Hui Chen) ； 謝享真(Siang-Jhen Hsieh) ； 施伶宜(Lin-Yi Shih) ； 陳偉徵(Wei-Jane Chen) ； 賴翊瑞(Yi-Jui Lai) ； 游奇恩(Chi-N Yu) ； 黃信壹(Shin-Yi Huang)

《高雄師大學報：自然科學與科技類》 39期 (2015/12) Pp. 25-44

摘要

石墨烯(graphene)是近期相當熱門的材料，具有很多優異的物性。目前有關以石墨烯或氧化石墨烯(graphene oxide, GO)為基底所合成的複合材料已廣泛被開發與應用，像是前幾年已有研究者製備出Chitin/Chitosan-GO-ZnO複合材料與其物性，但目前此複合材料尚未有製備出石墨烯為基底與Chitosan/ZnO之合成複合材料，所以本研究以相關合成技術去製備出rGO/CS/ZnO複合材料。本研究成功地合成出rGO/CS/ZnO複合材料，並且利用FT-IR光譜儀、粉末式X射線繞射儀、紫外光／可見光譜儀以及熱重量分析儀鑑定rGO/CS/ZnO複合材料。以FT-IR、XRD與UV-Vis 光譜圖顯示，判斷確實有成功合成rGO/CS/ZnO複合材料，也觀察到所合成複合材料有良好耐熱性。根據過去幾年的文獻，有人做GO/ZnO、GO/Chitosan等石墨烯相關的吸附亞甲藍之動力學，也有人以特定波長光照進行GO/ZnO降解反應，並探討其動力學。本研究改變複合材料的用量與攪拌速率等變因，從實驗結果得知，以rGO/CS/ZnO複合材料吸附亞甲藍的吸附動力學為Langmuir等溫吸附，屬於化學吸附。直到不同量的複合材料吸附平衡後，以365nm波長做光降解，探討實驗結果，得知以不同量的複合材料光降解亞甲藍溶液，其光降解動力學為一級反應。

關鍵字

亞甲藍 ； 吸附 ； 降解

並列摘要

In recent years, graphene, with many excellent properties, has attracted a lot of research attention. Studies about graphene or graphene oxide-based composites have been widely developed and applied, such as the synthesis of chitin/chitosan-based graphene oxide－ZnO hybrid composites for better properties. However, recent studies have not yet carried out for composite materials of graphene-based chitosan－ZnO, so our research was focused on the rGO/CS/ZnO composite. To characterize the rGO/CS/ZnO composite, we used FT-IR spectroscopy, X-ray powder diffraction, UV-Vis spectroscopy, and thermogravimetric analyzer to analyze the composite. The results of FT-IR, XRD and UV-Vis spectra show that composite is successfully synthesized and has good heat resistance. According to literature over the past few years, some researchers have studied kinetics of adsorption of methylene blue of GO/ZnO, GO/Chitosan and other graphene-related composite material. Others have used light at specific wavelength to conduct degradation experiments and explore the kinetics of photodegradation. In this study, the experimental data can be well fitted with the Langmuir isotherm equation. Kinetic studies show that adsorption process followed the second order reaction model and the photocatalytic degradation of Methylene blue by the rGO/CS/ZnO composite under visible light obeyed first order kinetics.

並列關鍵字

CS ； ZnO ； rGO ； methylene blue ； adsorption ； degradation