ZHANG Feng, DU Yucheng, LI Yang, LI Qiang, JIN Cuixin, NIU Yan

(Key Lab of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China)

Abstract: Brucite nanoflakes were deposited in-situ on sepiolite fiber (MSEP) via a hydrothermal method, and were applied for simultaneous recovery of phosphate and ammonium from waste water. Different reaction conditions including adsorbent dosage, solution pH and contact time were investigated. Precipitates collected were characterized by SEM, TEM, XRD, SEM-EDS and FTIR. The results show that MSEP exhibits a high equilibrium adsorption capacity reaching 62.52 mg/g of ammonium and 115.68 mg/g of phosphate at adsorbent dosage of 1.0 g/L, initial pH of 7.5 and contact time of 40 min. The MSEP adsorption kinetics follows the pseudo-second-order kinetic model(R2>0.99). Characterization of precipitates reveals the main mechanism of phosphate and ammonium recovery by MSEP is magnesium ammonium phosphate crystallization.

Keywords: nutrients recovery; magnesium ammonium phosphate; sepiolite; brucite; in-situ growth

中图分类号：TQ424.24; X703

文献标志码：A

文章编号：1008-5548(2019)01-0028-07

DOI:10.13732/j.issn.1008-5548.2019.01.005

收稿日期： 2018-08-06，修回日期：2018-09-20，在线出版时间：2018-12-23 07:00。

基金项目：国家重点研发计划项目，编号：2017YFB0310804。

第一作者简介：张丰(1993—)，男，硕士研究生，研究方向为环境功能材料。E-mail：fengz@emails.bjut.edu.cn。

通信作者简介：杜玉成(1963—)，男，博士，教授，硕士生导师，研究方向为环境功能材料、非金属矿物材料。E-mail：ychengdu@bjut.edu.cn。