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改性鸡蛋壳粉对水中磷的吸附性能研究
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Abstract:
本文制备了一种铁改性鸡蛋壳粉复合吸附剂(FeESP)，并通过静态试验探讨其对水中磷的吸收特性。首先利用SEM、XRD和FT-IR技术对FeESP进行结构和形貌分析，然后研究了FeESP用量、蛋壳粉粒径和含磷溶液的pH对磷吸附的影响。研究结果表明，FeESP能有效地去除水中磷，对于总磷浓度为1 mg/L的100 mL磷酸盐溶液，当粒径 ≤ 100 μm，FeESP用量为1.0 g，pH = 7.0，水温为40℃，经过1.5 h的搅拌吸附，磷的去除率可达99%以上。Langmuir模型和Freundlich模型均能够较好地拟合吸附等温线，吸附动力学与准一级、二级动力学模型的拟合度均较高。pH值是FeESP除磷的最主要影响因素，酸性条件下有利于吸收进程。
The iron-loaded eggshell powder (FeESP) was prepared by surface modification of eggshell powder with iron nitrate in this paper, and its phosphorus absorption characteristics in water were investigated by static experiment. Structure and morphology of FeESP were characterized by SEM and XRD and FT-IR, and then the effects of FeESP dosage, eggshell powder particle size and pH on phosphorus adsorption were investigated. The results showed that FeESP could effectively remove phosphorus from water. For 100 mL phosphate water with a total phosphorus concentration of 1 mg/L, the phosphorus removal rate could reach more than 99% when the particle size was ≤ 100 μm, the FeESP dosage was 1.0 g, pH = 7 and the water temperature was 40？C, after 1.5 h of stirring and adsorption. The maximum adsorption capacity was 0.111 mg/g at 40？C. The equilibrium data for phosphorus adsorption fitted Langmuir and Freundlich models well. The adsorption kinetic could be best described by the pseudo-first-order and pseudo-second-order equations. pH was the most important factor for phosphorus removal, and it was beneficial to the absorption process un-der acidic conditions.
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