【摘要】 通过共沉淀法制备Fe₃O₄/ZnO-BC复合材料,采用XRD、 UV-Vis、 TEM、 SEM等对材料进行了表征,结果表明:ZnO与Fe₃O₄形成核壳结构,并均匀分散于生物炭（BC）表面,复合材料同时存在Fe₃O₄和ZnO的晶相,Fe₃O₄/ZnO相比纯ZnO呈现更强的光吸收特性。考察了复合材料对水体中氨氮的去除能力,探究Fe₃O₄和ZnO物质的量比、 Fe₃O₄/ZnO与BC质量比、 pH值、催化剂投加量等因素对氨氮去除效果的影响。结果显示,当Fe₃O₄和ZnO物质的量比为1∶5, Fe₃O₄/ZnO与BC质量比为1∶1.5, pH值为11,催化剂投加量为3 g/L,废水体积为30mL,氨氮质量浓度为50 mg/L时,氨氮的去除率达到80%左右。复合材料可利用磁性简便回收,重复3次仍有良好的氨氮降解能力。更多还原

【Abstract】 Fe₃O₄/ZnO-BC composite material was prepared by co-precipitation method, and its performance was characterized by XRD, UV-Vis, TEM and SEM. The results showed that, ZnO and Fe₃O₄ formed a core-shell structure and homodispersed on the surface of biochar（BC）, there existed Fe₃O₄ and ZnO crystalline phase simultaneously in the said composite material, and compared to pure ZnO, Fe₃O₄/ZnO presented stronger optical adsorption properties. The performance of the composite material removing ammonia nitrogen from water was investigated, and the effect of mass ratios of Fe₃O₄ to ZnO, Fe₃O₄/ZnO to BC, pH value, catalyst dosage and some other factors on ammonia nitrogen removal was studied. The results showed that, when the mass ratios of Fe₃O₄ to ZnO and Fe₃O₄/ZnO to BC were 1 ∶ 5 and 1 ∶ 1.5 respectively, the pH value was 11, the catalyst dosage was 3 g/L, the wastewater volume was 30 mL, the mass concentration of ammonia nitrogen was 50 mg/L, the removal rate of ammonia nitrogen could reach about 80%. Moreover, Fe₃O₄/ZnO-biochar can be easily recovered by magnetic separation, and its degradation capacity on ammonia nitrogen is still good even after three cycles.更多还原