无机材料学报 ›› 2021, Vol. 36 ›› Issue (8): 841-846.DOI: 10.15541/jim20200512 CSTR: 32189.14.10.15541/jim20200512

• 研究论文 • 上一篇    下一篇

La/FeOOH@PAC对反渗透浓缩液中有机膦酸盐阻垢剂HEDP的吸附性能研究

李创1,2(), 杨庆峰1(), 陆盛森1, 刘阳桥3()   

  1. 1.中国科学院 上海高等研究院, 上海 201210
    2.中国科学院大学, 北京 100049
    3.中国科学院 上海硅酸盐研究所, 上海 200050
  • 收稿日期:2020-09-02 修回日期:2020-11-23 出版日期:2021-08-20 网络出版日期:2021-01-25
  • 通讯作者: 杨庆峰, 研究员. E-mail: yangqf@sari.ac.cn; 刘阳桥, 研究员. E-mail: yqliu@mail.sic.ac.cn
  • 作者简介:李 创(1991-), 男, 博士研究生. E-mail: lichuang740@163.com
  • 基金资助:
    国家自然科学基金(51878647);国家自然科学基金(61574148)

Adsorption of Phosphonate Antiscalant HEDP from Reverse Osmosis Concentrates by La/FeOOH@PAC

LI Chuang1,2(), YANG Qingfeng1(), LU Shengsen1, LIU Yangqiao3()   

  1. 1. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2020-09-02 Revised:2020-11-23 Published:2021-08-20 Online:2021-01-25
  • Contact: YANG Qingfeng, professor. E-mail: yangqf@sari.ac.cn; LIU Yangqiao, professor. E-mail: yqliu@mail.sic.ac.cn
  • About author:LI Chuang(1991-), male, PhD candidate. E-mail: lichuang740@163.com
  • Supported by:
    National Natural Science Foundation of China(51878647);National Natural Science Foundation of China(61574148)

摘要:

在反渗透脱盐过程中, 为了避免矿物质结垢广泛使用膦酸盐阻垢剂, 但这会对环境和浓缩液脱硬度产生不利影响, 需要在反渗透浓缩液处理前去除膦酸盐阻垢剂。本工作以活性炭(PAC)为载体, 采用共沉淀法制备了含有氢氧化镧与羟基氧化铁的复合材料(La/FeOOH@PAC), 利用La/Fe的协同作用提高吸附剂的吸附性能。采用不同手段对复合材料的结构和表面性质进行了表征, 并研究了其对模拟反渗透浓缩液中膦酸盐阻垢剂HEDP的吸附行为和性能, 考察了镧铁摩尔比、吸附时间、HEDP浓度和温度对其吸附性能的影响。实验结果表明: 制备的复合材料在298 K、pH=8.0和吸附剂用量为0.4 g/L的条件下, 其吸附等温线符合Langmuir模型, 理论最大吸附量为65.359 mg·g-1, 吸附动力学可用拟二级动力学方程来描述, 同时吸附过程为自发放热过程。XPS分析表明吸附剂的主要吸附机理为与镧/铁连接的羟基基团和HEDP之间的配体交换作用。

关键词: 羟基氧化铁, 氢氧化镧, 粉末活性炭, HEDP, 阻垢剂

Abstract:

Phosphonate antiscalants are commonly used in reverse osmosis (RO) membrane desalination to prevent fouling by mineral scale. However, due to its adverse effects on the ecosystem and the removal of hardness from RO concentrates, it is necessary to remove phosphonate antiscalants before RO concentrates disposal. In this work, using powder activated carbon (PAC) as carrier, La/FeOOH@PAC composite material was prepared via co-precipitation of lanthanum hydroxide and iron oxyhydroxide. The synergistic effect of La/Fe enhanced the adsorption capability of the composite material. Morphology and structure of the adsorbents were characterized by different methods. Adsorption behavior and properties of this composites for phosphonate antiscalant 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) in simulated reverse osmosis concentrates were also investigated. The effect of molar ratio of La to Fe, adsorption time, initial concentration of HEDP and temperature on the adsorption performance were investigated in details. The results showed that La/FeOOH@PAC composites was successfully synthesized by co-precipitation method. Under the adsorption conditions of 298 K, pH=8.0 and dosage of 0.4 g·L-1, the adsorption isothermal was in accordance with the Langmuir model, and the theoretical maximum adsorption capacity was 65.359 mg·g-1. Its adsorption kinetics could be fitted well with the pseudo-second-order kinetics equation, and adsorption behavior was an exothermic and spontaneous process. XPS analysis showed that the main adsorption mechanism of the adsorbent was the ligand exchange between hydroxyl groups linked with La/Fe and HEDP.

Key words: iron oxyhydroxide, lanthanum, powder activated carbon, HEDP, antiscalant

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