School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane Queensland 4001, Australia.
School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane Queensland 4001, Australia.
J Colloid Interface Sci. 2014 Mar 1;417:356-68. doi: 10.1016/j.jcis.2013.11.040. Epub 2013 Nov 22.
The application of layered double hydroxides (LDHs) and thermally activated LDHs for the removal of various fluorine (F(-),BF4(-)), chlorine (Cl(-),ClO4(-)), bromine (Br(-),BrO3(-)) and iodine (I(-),IO3(-)) species from aqueous solutions has been reviewed in this article. LDHs and thermally activated LDHs were able to significantly reduce the concentration of selected anions in laboratory scale experiments. The M(2+):M(3+) cation ratio of the LDH adsorbent was an important factor which influenced anion uptake. Though LDHs were able to remove some target anion species through anion exchange and surface adsorption thermal activation and reformation generally produced better results. The presence of competing anions including carbonate, phosphate and sulphate had a significant impact on uptake of the target anion as LDHs typically exhibit lower affinity towards monovalent anions compared to anions with multiple charges. The removal of fluoride and perchlorate from aqueous solution by a continuous flow system utilising fixed bed columns packed with LDH adsorbents has also been investigated. The adsorption capacity of the columns at breakpoint was heavily dependent on the flow rate and lower than result reported for the corresponding batch methods. There is still considerable scope for future research on numerous topics summarised in this article.
本文综述了层状双氢氧化物（LDHs）和热激活 LDHs 从水溶液中去除各种氟（F(-)、BF4(-)）、氯（Cl(-)、ClO4(-)）、溴（Br(-)、BrO3(-)）和碘（I(-)、IO3(-)）离子的应用。在实验室规模的实验中，LDHs 和热激活 LDHs 能够显著降低选定阴离子的浓度。LDH 吸附剂的 M(2+)：M(3+)阳离子比是影响阴离子吸收的重要因素。尽管 LDHs 能够通过阴离子交换和表面吸附去除一些目标阴离子，但热激活和再形成通常会产生更好的效果。共存的阴离子，包括碳酸盐、磷酸盐和硫酸盐，对目标阴离子的吸收有很大的影响，因为 LDHs 对单价阴离子的亲和力通常低于具有多个电荷的阴离子。还研究了利用固定床柱在连续流动系统中用 LDH 吸附剂去除水溶液中的氟化物和高氯酸盐。在突破点时，柱子的吸附容量严重依赖于流速，低于相应的批处理方法的报告结果。本文总结了许多研究课题，仍有相当大的研究空间。
