CIESC Journal ›› 2022, Vol. 73 ›› Issue (7): 3057-3067.DOI: 10.11949/0438-1157.20220329

• Separation engineering • Previous Articles     Next Articles

Specific electronically controlled separation of phosphate anions based on variable valence NiFe-LDH/rGO

Jiangwei ZHU1(),Pengfei MA1(),Xiao DU1,Yanyan YANG2,Xiaogang HAO1(),Shanxia LUO3   

  1. 1.Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    2.School of Chemistry and Environmental Science, Shangrao Normal University, Shangrao 334001, Jiangxi, China
    3.Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China
  • Received:2022-03-03 Revised:2022-05-19 Online:2022-08-01 Published:2022-07-05
  • Contact: Pengfei MA,Xiaogang HAO

基于可变价NiFe-LDH/rGO对磷酸根离子的特异性电控分离

朱江伟1(),马鹏飞1(),杜晓1,杨言言2,郝晓刚1(),罗善霞3   

  1. 1.太原理工大学化学化工学院,山西 太原 030024
    2.上饶师范学院化学与环境科学学院,江西 上饶 334001
    3.河北省区域地质调查院,河北 廊坊 065000
  • 通讯作者: 马鹏飞,郝晓刚
  • 作者简介:朱江伟(1997—),男,硕士研究生,zhujiangwei9712@163.com
  • 基金资助:
    中国博士后科学基金项目(2020M680916);国家自然科学基金区域创新发展联合基金项目(U21A20303);上饶市高校研发投入后补助资金科技计划项目

Abstract:

Phosphorus is a non-renewable resource. In order to solve the problems of existing phosphorus pollution and phosphorus resource loss, a NiFe-LDH/rGO electroactive hybrid film material was successfully prepared in this study by a combination of oil bath and thermochemical reduction. An ESIX process allows the NiFe-LDH/rGO hybrid film achieving a controllably selective uptake and release of the phosphate anions. This route involves tuning potential steps to regulate the redox states of the composite film and the variable metal (e.g., Ni, Fe (Ⅱ)/(Ⅲ)) in coordination centers, as the inner-sphere complexation of the metals to phosphate anions is combined with the assistance of the outer electric field. A high absorption capacity (270 mg·g-1) and regeneration rate (>85%) were achieved, together with good cycle stability. This route provides an efficient, theoretical and technical support to solve the problems phosphogypsum leachate and various phosphorus wastewater pollution, which presents a broad application prospect.

Key words: NiFe-LDH/rGO, phosphate anions, electrochemistry, selectivity, adsorption capacity, stability

摘要:

磷是一种不可再生资源。为解决现有磷污染以及磷资源流失等问题,通过油浴与热化学还原相结合的方法,成功制备出一种NiFe-LDH/rGO电活性杂化膜材料。使用电化学方法,在氧化还原电位的控制下,Ni、Fe(Ⅱ/Ⅲ)双金属发生核外电子的跃迁,高价态的Ni、Fe(Ⅲ)与PO43-发生内球络合作用,实现PO43-的选择性置入-置出。实验获得270 mg·g-1的高PO43-吸附容量及85%以上的再生效率。此外,该杂化膜材料在共存离子存在的复杂水体中,对PO43-具有优异的选择性,为磷石膏渗滤液以及各种含磷废水污染等问题的解决提供有效的理论技术支撑,具有广阔的应用前景。

关键词: NiFe-LDH/rGO, PO43-, 电化学, 选择性, 吸附容量, 稳定性

CLC Number: