磁性锆铁改性沸石吸附疏浚余水中磷酸盐的特性

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第36卷期数: 2020年第9期页码: 69-74 栏目: 出版日期: 2020-05-01

Title:: Adsorption Characteristics of Phosphate in Residual Dredging Water by Zeolite Modified with Magnetic Zirconium/Iron

作者:: 张允宝^1,2，李怡冰³，刘朝晖^1,4，张卿⁵，曾小康^1,3,4，胡文涛^1,3,4，孙士权^1,3,4

关键词:: font-size: 10pt; ">磁性锆铁改性沸石; 疏浚余水; 磷酸盐; 吸附特性

Keywords:: font-size: 10pt; ">zeolite modified with magnetic zirconium/iron; residual dredging water; phosphate; adsorption characteristics

摘要:: 采用共沉淀法制备了磁性锆铁改性沸石，在研究其对疏浚余水中磷酸盐吸附特性的基础上，采用X射线衍射仪（XRD）表征其结构，探讨吸附磷的特性。结果表明，Langmuir等温吸附模型、准二级动力学模型和颗粒内扩散模型均可以较好地描述磁性锆铁改性沸石对疏浚余水中磷酸盐的吸附特征。当吸附剂投加量为18 mg/L、pH值为7时，疏浚余水中磷酸盐的饱和吸附量为11.4 mg/g（以磷计）；当pH值为5~7时，磁性锆铁改性沸石对磷酸盐的吸附效果较好，偏碱性条件下吸附量明显下降；当水温在10~30 ℃时，对磷酸盐的吸附效果随温度的升高而增加；磁性锆铁改性沸石吸附水中磷酸盐的过程属于化学吸附。

Abstract:: Zeolite modified with magnetic zirconium/iron was prepared by coprecipitation method. Based on exploring its adsorption characteristics of phosphate in residual dredging water, the phosphate adsorption characteristics were determined through characterization of its structure by XRD. The adsorption characteristics of the phosphate in the residual dredging water by the zeolite modified with magnetic zirconium/iron could be described by Langmuir isothermal adsorption model, quasi- secondary kinetic model and particle internal diffusion model. When the adsorbent dosage was 18 mg/L and the pH was 7, the maximum adsorption capacity of phosphate in the residual dredging water was 11.4 mg/g (calculated as phosphorus). When the pH was between 5 and 7, the adsorption efficiency of the zeolite modified with magnetic zironium/iron on phosphate was better, and the adsorption amount decreased obviously under alkaline condition. When the temperature was between 10 ℃ and 30 ℃, the adsorption efficiency of phosphate increased with the increase of temperature. The adsorption of phosphate in water by the zeolite modified with magnetic zirconium/iron belonged to chemical adsorption.

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更新日期/Last Update: 2020-05-01