无机再生剂性能对聚合物阴离子交换树脂吸附和解吸药物性能的影响。
Effect of inorganic regenerant properties on pharmaceutical adsorption and desorption performance on polymer anion exchange resin.
机构信息
School of Environment, MOE Key Laboratory of Water and Sediment Sciences/State Key Lab of Water Environment Simulation, Beijing Normal University, Beijing 100875, China.
School of Environment, MOE Key Laboratory of Water and Sediment Sciences/State Key Lab of Water Environment Simulation, Beijing Normal University, Beijing 100875, China.
出版信息
Chemosphere. 2017 Sep;182:325-331. doi: 10.1016/j.chemosphere.2017.05.042. Epub 2017 May 10.
This study investigated the potential effect of four frequently used inorganic regenerant properties (i.e., ionic strength, cation type, anion type, and regeneration solution volume) on the desorption and adsorption performance of 14 pharmaceuticals, belonging to 12 therapeutic classes with different predominant chemical forms and hydrophobicities, using polymeric anion exchange resin (AER)-packed fixed-bed column tests. After preconditioning with NaCl, NaOH, or saline-alkaline (SA) solutions, all resulting mobile counterion types of AERs effectively adsorbed all 14 pharmaceuticals, where the preferential magnitude of OH-type = Cl + OH-type > Cl-type. During regeneration, ionic strength (1 M versus 3 M NaCl) had no significant influence on desorption performance for any of the 14 pharmaceuticals, while no regenerant cation (HCl versus NaCl) or anion type (NaCl versus NaOH and SA) achieved higher desorption efficiencies for all pharmaceuticals. A volumetric increase in 1 M or 3 M NaCl solutions significantly improved the desorption efficiencies of most pharmaceuticals, irrespective of ionic strength. The results indicate that regeneration protocols, including regenerant cation type, anion type and volume, should be optimized to improve pharmaceutical removal by AERs.
本研究使用聚合物阴离子交换树脂（AER）填充固定床柱试验，考察了四种常用无机再生剂特性（即离子强度、阳离子类型、阴离子类型和再生溶液体积）对 14 种药物（属于 12 种治疗类别，具有不同的主要化学形式和疏水性）的解吸和吸附性能的潜在影响。在使用 NaCl、NaOH 或盐碱性（SA）溶液进行预处理后，AER 的所有移动抗衡离子类型都有效地吸附了所有 14 种药物，其中 OH 型＞Cl＋OH 型＞Cl 型。在再生过程中，离子强度（1 M 与 3 M NaCl）对 14 种药物中的任何一种的解吸性能均无显著影响，而任何一种再生剂阳离子（HCl 与 NaCl）或阴离子类型（NaCl 与 NaOH 和 SA）都不能提高所有药物的解吸效率。1 M 或 3 M NaCl 溶液体积的增加显著提高了大多数药物的解吸效率，而与离子强度无关。结果表明，应优化再生方案，包括再生剂阳离子类型、阴离子类型和体积，以提高 AER 对药物的去除效果。
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