許多工業在生產過程中所排出的廢水含有高濃度重金屬，例如:電子產業所排放之廢水中就含有鋁、砷、鋇、鎘、六價鉻、銅、鐵、鉛、錳、汞、鎳、硒、銀及鋅等重金屬。磁性奈米顆粒具製作成本低廉、設備維護成本低、可重複使用之優點，可改善傳統廢水處理程序以解決重金屬污染物的問題。傳統未改質奈米顆粒Fe3O4 (Fe3O4 MNP)應用於廢水處理過程中往往都會有嚴重的團聚現象進而減少吸附能力，故本研究選用腐質酸為改質劑，並評估腐植酸表面改質Fe3O4 (Fe3O4/Human acid)奈米顆粒去除廢水中重金屬砷之可行性。
藉由SEM、ESEM-EDS與XRD特性分析可證明所合成的Fe3O4為奈米級顆粒，具有磁性且改質過後可改善其團聚現象。Fe3O4/Human acid比表面積值為92.2 m2/g。田口實驗設計法以Fe3O4/Human acid去除重金屬砷，其最佳去除條件為pH值為 5、劑量5 g/L、接觸時間180 min及陰陽離子濃度20 mg/L其去除率達94.3％。反應動力試驗吸附模式符合pseudo-second order。於Fe3O4/Human acid劑量3 g/L時，其平衡吸附量qe為0.421 mg/g，二階速率k2為 0.156 g mg-1 min-1；Fe3O4/Human acid劑量5 g/L時，其平衡吸附量qe為0.452 mg/g，二階速率k2為 0.222 g mg-1 min-1。

Many industries discharged wastewater, during the production process, containing high concentrations of heavy metals, such as: wastewater discharged from the electronics industry contains aluminum, arsenic, barium, cadmium, hexavalent chromium, copper, iron, lead, manganese, mercury, nickel, selenium, silver and zinc and other heavy metals. Fe3O4 magnetic nanoparticles (Fe3O4 /MNP) have been widely used to resolve environmental problems, because of their extremely small size, absence of internal diffusion resistance, low cost, high magnetism, and high separation convenience. Bare Fe3O4 MNP tends to agglomerate into larger particles and then reduce their sorption capacity in the wastewater treatment process. This is a major disadvantage. Therefore, this study investigates the performance of humic acid modified Fe3O4 (Fe3O4/ Humic acid) in removing the Arsenic from aqueous solution.
The SEM, ESEM-EDS and XRD analysis showed that the synthesized Fe3O4/Humic acid nanoparticles were magnetic and could solve the agglomeration problem. The mean specific surface area of the Fe3O4/ Humic acid was 92.2 m2/g. The optimal conditions of the Taguchi experimental design for the removal of As (V) aqueous solutions by Fe3O4/ Humic acid were a pH 5, dosage of 5 g/L, and a contact time 180 min. The removal efficiency attained under these conditions were 94.3%. The kinetic studies on the adsorption of arsenic showed that the process complied with pseudo-second order kinetics. Experiments carried to test the removal of arsenic from aqueous solutions by Fe3O4/ Humic acid with pseudo-second order kinetics, showed that when the dose of Fe3O4/ Humic acid was 3 g/L, the sorption capacity at equilibrium (qe) was 0.421 mg/g, and rate constant (k2) was 0.156 g mg-1 min-1. When the dose of Fe3O4/ Humic acid was 5 g/L the sorption capacity at equilibrium (qe) was 0.452 mg/g, and rate constant (k2) was 0.222 g mg-1 min-1.

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