Recovery of ammonium from aqueous solutions using ZSM-5
Recovery of ammonium from aqueous solutions using ZSM-5
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DOI：
10.1016/j.chemosphere.2018.01.126
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发表时间：
2018-05-01
期刊：
影响因子：
8.8
通讯作者：
Wang, Chao
中科院分区：
文献类型：
--
作者：
Manto, Michael J.;Xie, Pengfei;Wang, Chao
随着人口的增长，肥料施用对活性氮（N），如铵（NH4+）和硝酸盐（NO3-）的需求持续增加，但目前用于工业固氮的哈伯博世（H-B）工艺面临低效率和高能耗的挑战。在此，我们报告了 ZSM-5 作为从水溶液中回收铵的优质吸附剂的研究。使用 NH4Cl 和 NaCl 的合成溶液分别实现了铵 (NH4+) 的快速捕获和释放，总体回收效率 > 90%。 ZSM-5 吸附剂还被发现是可回收的，并且在多次捕获-释放循环后仍能保持高回收效率。进一步系统地研究了吸附剂剂量和反应温度对N的捕获，并在此基础上讨论了离子交换的机理、热力学和动力学。与其他离子交换材料相比，ZSM-5 吸附剂在存在竞争性阳离子（NH4+ >> Ca2+ > Mg2+ > K+ > Na+）的情况下表现出优异的捕获铵的选择性，并且从实际废水流中回收铵的效率很高。 (C) 2018 Elsevier Ltd. 保留所有权利。
The demand of reactive nitrogen (N), such as ammonium (NH4+) and nitrate (NO3-), continues to increase for fertilizer applications as the population grows, but the Haber Bosch (H-B) process currently employed for industrial N fixation is challenged by low efficiency and high energy consumption. Here we report on the investigation of ZSM-5 as a superior sorbent for the recovery of ammonium from aqueous solutions. Fast capture and release of ammonium (NH4+) have been achieved with > 90% overall efficiency of recovery using synthetic solutions of NH4Cl and NaCl, respectively. The ZSM-5 sorbent has also been found to be recyclable and sustain high recovery efficiencies after multiple capture-release cycles. The capture of N has been further studied systematically in dependence of the dose of sorbent and reaction temperature, based on which the mechanism, thermodynamics and kinetics of ion exchange are discussed. Compared to other ion-exchange materials, the ZSM-5 sorbent exhibits superior selectivity for capturing ammonium in the presence of competing cations (NH4+ >> Ca2+ > Mg2+ > K+ > Na+) and demonstrates high efficiency of ammonium recovery from real wastewater streams. (C) 2018 Elsevier Ltd. All rights reserved.