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本试验通过设置不同磷酸根浓度、pH和不同电解质及电解质强度梯度,研究磷酸根在针铁矿-胡敏酸(HA)复合物和赤铁矿-胡敏酸(HA)复合物表面的吸附特性。X射线衍射(XRD)、扫描电镜(SEM)和红外光谱(FTIR)图谱显示:铁氧化物包覆胡敏酸后其内部结构特性保持不变;氧化铁与胡敏酸通过氢键形成粒径大、表面光滑的铁氧化物-HA复合微粒,且复合物比表面减小;形成的氧化铁-胡敏酸复合物对磷的吸附能力增强,且针铁矿复合物的吸附能力大于赤铁矿复合物,均为多层吸附过程;pH增高抑制铁氧化物复合物对磷的吸附,同时电解质浓度增加促进复合体对磷的吸附,且反应后体系pH随之降低。
In this experiment, the adsorption of phosphate on the surface of goethite-humic acid (HA) complex and hematite-humic acid (HA) complex was studied by setting different phosphate concentration, pH and different electrolyte and electrolyte intensity gradients characteristic. X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) spectroscopy showed that the internal structure of iron oxide coated humic acid remained the same; iron oxide and humic acid formed by hydrogen bonding particle size Large, smooth surface iron oxide-HA composite particles, and the specific surface area decreased; the formation of iron oxide - humic acid complex phosphorus adsorption capacity increased, and goethite complex adsorption capacity than hematite The results showed that the adsorption of phosphorus was inhibited by the increase of pH, meanwhile, the increase of electrolyte concentration promoted the adsorption of phosphorus to the complex, and the pH of the system decreased after the reaction.