未改質與幾丁聚醣表面改質鐵錳氧化磁體之製備與吸附特性研究

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Title:	未改質與幾丁聚醣表面改質鐵錳氧化磁體之製備與吸附特性研究 Study on the Preparation and Adsorption of Magnetic Iron Manganese Oxide and Surface Modification with Chitosan
Authors:	葉致賢
Contributors:	環境工程與科學系陳煜斌
Keywords:	鐵錳氧化磁體幾丁聚醣吸附 MnFe2O4 Chitosan Adsorption
Date:	2016
Issue Date:	2016-12-21 15:30:50 (UTC+8)
Abstract:	本研究係利用氧化法硝酸鐵、硝酸錳及尿素固定比例進行鐵錳氧化磁體(MnFe2O4)之合成，並以幾丁聚醣固化於鐵錳氧化磁體，以利於吸附。本研究中以不同?燒溫度及?燒時間，在高溫下合成鐵錳氧化磁體，探討最佳合成MnFe2O4條件，以SEM、XRD以及SQUID VSM進行定性分析，確認產物為鐵錳氧化磁體。SEM中形貌較圓且顆粒大小較為均勻，其顆粒粒徑約在5nm~110nm；在XRD可得知其結果符合MnFe2O4之晶相，；VSM分析中皆具有磁性，除了800℃磁化率較低之外，400℃及600℃測得結果皆大於16.3emu/g，較易以外加磁場將之移除。本研究得到MnFe2O4最佳製備條件為600℃?燒30分鐘。以鹽酸溶解幾丁聚醣後，將MnFe2O4置入，再調整pH至中性使幾丁聚醣固化於MnFe2O4得到Chi@MnFe2O4，並進行以MnFe2O4及Chi@MnFe2O4對銅的吸附實驗，MnFe2O4屬於Langmuir模式，最大吸附量0.571mg/g；Chi@MnFe2O4屬於Freundlish模式，最大吸附量2.638mg/g，其中n>1，說明Chi@MnFe2O4吸附效果優於MnFe2O4。 In this study, manganese-ferrite was synthesized using combustion synthesis process using fixed ratio of ferric nitrate, manganese nitrate, and urea.Then use MnFe2O4 coated by Chitosan to produce a Chi@MnFe2O4 nanocomposites and used as adsorbents. Different ignition temperature and time were used in preparing the Manganese ferrite (MnFe2O4) to determine the optimum condition and were characterized by SEM, XRD and SQUID VSM. The SEM analysis revealed that the morphology and particle size of the adsorbent contains nanoparticles of uniform circular structure. The evidence for the phase purity and formation of MnFe2O4 particles were validated by X-ray diffraction. The ferromagnetic behavior of prepared MnFe2O4 at temperature 400 ?C, 600 ?C and 800 ?C was examined using VSM analysis and showed a saturation magnetization of 16.3 emu/g. The synthesized MnFe2O4 and Chi@MnFe2O4 were used in removing copper from aqueous solution. The experiment showed that MnFe2O4 obeys Langmuir Isotherm and maximum adsorption capacity is 0.571mg/g.; Chi@MnFe2O4 nanocomposite follows Freundlich Isotherm. Chi@MnFe2O4 showed a higher adsorption capacity over MnFe2O4 with maximum adsorption capacity of 2.638 mg/L.
Relation:	網際網路公開：2018-09-05，學年度：104，76頁
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Dissertations and Theses

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