采用液相化学还原法制备纳米零价铁,并负载于膨胀珍珠岩上制备nFe@EP材料,用于去除水体中的磷酸盐。考察了溶液初始pH、温度、nFe@EP投加质量浓度和初始磷酸盐质量浓度的影响。结果表明,nFe@EP对水中磷酸盐有良好的吸附性,在温度298 K、pH 5.0、初始磷酸盐质量浓度为100 mg/L、nFe@EP质量浓度为3.0 g/L时,磷酸盐的去除率可达95.7%,吸附量达到31.9 mg/g。吸附动力学研究结果表明,伪二级吸附动力学模型能够更好地拟合nFe@EP吸附磷酸盐的行为,说明吸附过程是以化学吸附为主。热力学分析结果表明,吸附是自发放热的过程。

Nano-zero valent iron is prepared by using liquid-phase chemical reduction method and loaded on expanded perlite to prepare nFe@EP material for removing phosphates in water.The effects of initial pH,temperature,the dosage of nFe@EP and the initial concentration of phosphates are investigated respectively.Results show that nFe@EP has a good adsorption to phosphates in water.The removal rate and adsorption capacity of phosphates can achieve 95.7% and 31.9 mg·g^-1,respectively when the temperature is at 298 K,pH=5.0,the initial concentration of phosphates is 100 mg·L^-1,and the dosage of nFe@EP is 3.0 g·L^-1.It is found from adsorption kinetic studies that the pseudo-second-order adsorption kinetic model can better fit the adsorption of phosphates by nFe@EP,indicating that the adsorption process is dominated by chemical adsorption.Thermodynamic analysis results show that the adsorption is a spontaneous and exothermic process.

范晨(1997-),女,硕士研究生,研究方向为水污染控制与水质保障,690717731@qq.com。