CuO/Fe_2O_3/rGO奈米複合材料之合成、物性及吸附與降解甲基紫動力學之研究

本研究利用水熱合成法，成功製備出CuO/Fe_2O_3/rGO奈米複合材料，並以粉末式X-ray繞射儀、FT-IR及SEM鑑定此奈米複合材料，再利用熱重量分析儀測定其耐熱性。在CuO/Fe_2O_3/rGO奈米複合材料吸附甲基紫之應用上，首先改變吸附劑的量（1~5mg）當作變因，由Ce（溶液平衡濃度）與q_e（溶液平衡時的吸附量）間的關係以及Freundlich與Langmuir兩者fitting後的線性方程式之R^2值，可判定吸附劑吸附染料甲基紫溶液之吸附過程為Freundlich等溫的物理吸附，再探討k值以及q_e對不同量吸附劑吸附甲基紫溶液動力學之影響。接著以轉速（300、600、900、1200rpm）當作變因，由此兩變因可判定吸附動力學為二級反應，再探討k值及q_e在吸附過程中對不同轉速之動力學影響。以CuO/Fe_2O_3/rGO奈米複合材料光降解已吸附平衡的甲基紫，可以發現光波長365nm比254nm的降解效果更好，而不同量吸附劑降解已吸附平衡的甲基紫之降解反應動力學級數為一級反應，並探討k值之變化。

關鍵字

甲基紫；吸附；光降解

並列摘要

In this research CuO/Fe_2O_3/rGOnanocomposites were successfully synthesized by hydrothermal method. The structure and properties of this nanocomposite were characterized by FT-IR, X-ray powder diffraction, SEM and TGA. In this study we used the CuO/Fe_2O_3/rGOnanocomposites to adsorb methyl violet. First, we changed amount of adsorbent from 1mg to 5mg. From the relationship of C_e and qe, we can determine the value of R^2 of the calibration curve by fitting Freundlich and Langmuir adsorptions. We got the result that the process of the absorbent adsorbed methyl violet is Freundlich adsorption, which is isothermal and physical adsorption. We also discussed the effects of different amounts of adsorbent on K and qe in this process. Second, we changed the speed of stir from 300 rpm to 1200 rpm. From these results, we find that this process is second-order reaction. We also discussed the effects of different speeds of stir on K and qe in this adsorption process. By using CuO/Fe_2O_3/rGOnanocompositesto photodegrade methyl violet, we find that wavelength of source in 365nm is better than in 254nm, the kinetics of adsorbent to degrade methyl violet is first-order reaction. The effects of experimental conditions on the rate constant will be discussed in detailed.

並列關鍵字

CuO ； Fe_2O_3 ； rGO ； methyl violet ； adsorption ； degradation

國際替代計量

CuO/Fe_2O_3/rGO奈米複合材料之合成、物性及吸附與降解甲基紫動力學之研究

全文下載

主題瀏覽