本研究以KMnO4改質鐵氧化物(BT4)，製備出吸附材(MBT4)，對三價砷(As(III))進行吸附研究，藉由觀察水中的錳離子和砷離子濃度變化來推倒MBT4對三價砷的吸附機制。
對鐵氧化物(BT4)顆粒進行鑑定與分析，由XRD的鑑定BT4為含微量結晶的α-FeOOH，粒徑為0.125~0.25mm，由BET分析出比表面積為154m2/g。
吸附材改質實驗結果顯示，MBT材料上的錳負載量隨著進料鐵/錳莫耳比(FeCl2/KMnO4)的增加而下降，並發現BT4本身即可與MnO4-反應，不需外加FeCl2 ，反應24小時後，MBT4的錳負載量可達1.24 mg/g。
吸附砷實驗結果顯示，MBT4對As(III)吸附量為12.82 mg/g大於未改質BT4對As(III)吸附量（10.87 mg/g）。在吸附動力方面，以一階動力模式、擬二階動力模式和二階動力模式來模擬，發現MBT4對As(III)的吸附較符合擬二階動力模式和二階動力模式。在等溫吸附實驗方面，以Langmuir Model與Freundlich Model來討論，發現較符合Freundlich Model。最後，討論陰離子對MBT4吸附As(III)的干擾，以磷酸鹽的影響最大，硫酸鹽次之，硝酸鹽影響很小。在MBT4對As(III)的吸附機制的探討上，本研究推測為As(III) 先與MBT4的含錳有效活性座進行氧化反應，將As(III)被氧化為As(V)，MBT4再將As(V)吸附移除，故提高近二成的As吸附量。

In this study, we modified iron oxide (BT4) by using KMnO4 to prepare a new adsorbent-MBT4 which was used to removal arsenite (As(III)) from water solution. We detected the concentration variation of As(III) and Mn in the solution to investigate the adsorption mechanism.
We take appraisement and analysis for iron oxide (BT4). The result of XRD showed that BT4 contained lots of amorphous goethite (α-FeOOH). The particle size range was 0.125~0.25 mm.The Specific surface area of BT4 was 154 m2/g by using BET analysis.
When the feed Fe/Mn molar ratio (FeCl2/KMnO4) increased, the capacity of Mn loading on MBT4 decreased. We also found that BT4 could react with MnO4- by itself. The capacity of Mn loading on MBT4 was 1.24 mg/g after 24 hours of the reaction.
The As adsorption capacity of MBT4 was 12.82 mg/g which is higher than that of BT4 (10.87 mg/g). Three models were used to describe the adsorption kinetics. Pseudo-second-order rate equation and the second-order rate equation were more suitable than the first-order Lagergren equation . For adsorption isotherm, Freundlich Model was better than Langmuir Model. The competition of nitrate, sulfate and phosphate with arsenate was also studied. Phosphate and sulfate decreased the arsenate removal efficiency. Nitrate had no obvious effect on the adsorption of arsenite. The mechanism of removal As(III) by MBT4 was proposed. Intially, As(III) was oxidateed by Mn oxide on MBT4. As(III) was transformed into As(V).Finally, MBT4 adsorbed As(V).

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