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Selective Ammonium Removal from Synthetic Wastewater by Flow-Electrode Capacitive Deionization Using a Novel K2Ti2O5-Activated Carbon Mixture Electrode.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-14 , DOI: 10.1021/acs.est.0c04383 Lin Lin 1 , Jiahui Hu 2 , Jiahua Liu 1 , Xin He 1 , Bing Li 2 , Xiao-Yan Li 1, 2, 3
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-14 , DOI: 10.1021/acs.est.0c04383 Lin Lin 1 , Jiahui Hu 2 , Jiahua Liu 1 , Xin He 1 , Bing Li 2 , Xiao-Yan Li 1, 2, 3
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Ammonium (NH4+) in wastewater is both a major pollutant and a valuable resource. Flow-electrode capacitive deionization (FCDI) is a promising technology for chemical-free and environmentally friendly NH4+ removal and recovery from wastewater. However, the coexisting sodium (Na+) in wastewater, with a similar hydrated radius to NH4+, competes for the adsorption sites, resulting in low NH4+ removal efficiency. Here, potassium dititanate (K2Ti2O5 or KTO) particles prepared by the electrospray method followed by calcination were mixed with activated carbon (AC) powder to form a novel KTO-AC flow-electrode for selective NH4+ removal over Na+. The mixed KTO-AC electrode exhibits a much higher specific gravimetric capacitance in NH4Cl solution than in NaCl solution. Compared with the pure AC electrode in the FCDI tests on NH4+ removal from synthetic wastewater, 25 wt % KTO addition in the electrode mixture increases the adsorption selectivity from 2.3 to 31 toward NH4+ over Na+, improves the NH4+ removal from 28.5% to 64.8% and increases the NH4+ desorption efficiency from 35.6% to over 80%, achieving selective NH4+ recovery and effective electrode regeneration. Based on DFT calculations, NH4+ adsorption on the K2Ti2O5 (0 0 1) surface is more thermodynamically favorable than that of Na+, which contributes to the high NH4+ adsorption selectivity observed.
中文翻译：
使用新型K2Ti2O5活化的碳混合电极通过流电极电容去离子从合成废水中选择性去除铵。
废水中的铵（NH 4 +）既是主要污染物，又是宝贵资源。流电极电容去离子（FCDI）是一种有前途的技术，用于从废水中去除和回收无化学物质且环保的NH 4 +。但是，废水中共存的钠（Na +）的水合半径与NH 4 +相似，它们竞争吸附位点，导致NH 4 +的去除效率低。在这里，二钛酸钾（K 2 Ti 2 O 5通过电喷射法接着煅烧制备或KTO）颗粒活性炭（AC）粉末混合以形成一种新的KTO-AC流电极用于选择性NH 4 +除去经Na +。混合的KTO-AC电极在NH 4 Cl溶液中比在NaCl溶液中具有更高的比重电容。与FCDI测试中从合成废水中去除NH 4 +的纯AC电极相比，电极混合物中添加25 wt％的KTO相对于Na +而言，对NH 4 +的吸附选择性从2.3提高到31 ，从而提高了NH 4 +的去除率从28.5％增加到64.8％并增加了NH4 +解吸效率从35.6％提高到80％以上，实现了选择性的NH 4 +回收和有效的电极再生。根据DFT计算，与Na +相比，K 2 Ti 2 O 5（0 0 1）表面上的NH 4 +吸附在热力学上更有利，这有助于观察到较高的NH 4 +吸附选择性。
更新日期：2020-10-06
中文翻译：
使用新型K2Ti2O5活化的碳混合电极通过流电极电容去离子从合成废水中选择性去除铵。
废水中的铵（NH 4 +）既是主要污染物，又是宝贵资源。流电极电容去离子（FCDI）是一种有前途的技术，用于从废水中去除和回收无化学物质且环保的NH 4 +。但是，废水中共存的钠（Na +）的水合半径与NH 4 +相似，它们竞争吸附位点，导致NH 4 +的去除效率低。在这里，二钛酸钾（K 2 Ti 2 O 5通过电喷射法接着煅烧制备或KTO）颗粒活性炭（AC）粉末混合以形成一种新的KTO-AC流电极用于选择性NH 4 +除去经Na +。混合的KTO-AC电极在NH 4 Cl溶液中比在NaCl溶液中具有更高的比重电容。与FCDI测试中从合成废水中去除NH 4 +的纯AC电极相比，电极混合物中添加25 wt％的KTO相对于Na +而言，对NH 4 +的吸附选择性从2.3提高到31 ，从而提高了NH 4 +的去除率从28.5％增加到64.8％并增加了NH4 +解吸效率从35.6％提高到80％以上，实现了选择性的NH 4 +回收和有效的电极再生。根据DFT计算，与Na +相比，K 2 Ti 2 O 5（0 0 1）表面上的NH 4 +吸附在热力学上更有利，这有助于观察到较高的NH 4 +吸附选择性。
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