钢渣负载纳米零价铁-羟基磷灰石(S-FH)的制备及其对锰的吸附性能

通过液相还原法制备钢渣负载纳米零价铁-羟基磷灰石（S-FH）。分析Fe0-HAP被负载前后的微观形貌，研究了pH、S-FH投加量、反应时间和锰的初始浓度对S-FH吸附锰的影响，并借助吸附动力学模型和吸附等温模型对吸附机理作进一步分析。结果表明，在锰溶液初始浓度5 mg/L、pH=5，S-FH用量0.1 g和反应时间300 min条件下，吸附效果最佳。S-FH对锰的吸附过程更符合Freundlich吸附等温线模型（R2>0.98）和准二级动力学模型（R2>0.99）。吸附机理为离子交换、表面络合和溶解-沉淀。

Preparation of Nano-Zero-Valent Iron - Hydroxylapatite Coated Steel Slag and Its Adsorption Properties for Manganese

Nano-zero-valent iron - hydroxylapatite coated steel slag (S-FH) was prepared by liquid-phase reduction method. Microstructure of Fe0-HAP before and after loaded was analized. Effects of pH value, dosage of S-FH, reaction time, and initial concentration of manganese on adsorption of manganese with S-FH were investigated. The adsorption mechanism was further analyzed using adsorption kinetic model and adsorption isotherm model. The results show that the best adsorption effect is obtained under the conditions including initial concentration of Mn of 5 mg/L, pH value of 5, dosage of S-FH of 0.1 g, and reaction time of 300 min. The adsorption of Mn by S-FH is more consistent with the Freundlich sorption isotherm model (R2>0.98) and quasi-second order kinetic model (R2>0.99). The adsorption mechanism is ion exchange, surface complexation, and dissolution-precipitation.