Department of Chemistry & Bioscience, Aalborg University, Niels Bohrs Vej 8, 6700, Esbjerg, Denmark.
Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands.
Environ Sci Pollut Res Int. 2024 Nov;31(55):63734-63746. doi: 10.1007/s11356-024-35444-7. Epub 2024 Nov 6.
This study investigated the efficacy of oxidised iron-loaded activated carbon cloth (Fe-ACC) for selective recovery of phosphorous. The capacitive deionisation (CDI) technology was employed, for rapid removal of phosphate, with the aim of reducing the reliance on high alkalinity environment for the regeneration of Fe-ACC electrode. Multiple experimental parameters, including applied potential, pH, and co-existing ions, were studied. Additionally, the CDI system was tested on a real water matrix (Lake Ormstrup, Denmark) to elucidate the electrodes' performance on selective recovery of phosphate. About 69 ± 10% of the adsorbed phosphate were released at pH 12 via pure chemical desorption, which was ~ 50% higher than that at pH 9. The CDI system successfully demonstrated the selective removal of phosphate from the lake water. It reduced the concentration of phosphate from 1.69 to 0.49 mg/L with a 71% removal efficiency, while the removal percentages of other anions, namely chloride, sulphate, bromide, nitrite, nitrate, and fluoride, were 10%, 7%, 1%, 1.5%, 4%, and 7%, respectively.
本研究考察了负载氧化铁的活性炭布（Fe-ACC）用于选择性回收磷的效果。采用电容去离子（CDI）技术，快速去除磷酸盐，旨在减少对高碱性环境的依赖，以再生 Fe-ACC 电极。研究了多个实验参数，包括施加的电势、pH 值和共存离子。此外，还在实际水基质（丹麦奥尔姆斯托普湖）上测试了 CDI 系统，以阐明电极对选择性回收磷酸盐的性能。在 pH 值为 12 时，通过纯化学解吸可释放约 69±10%的吸附磷酸盐，比 pH 值为 9 时高约 50%。CDI 系统成功地从湖水中选择性去除了磷酸盐。它将磷酸盐的浓度从 1.69 降至 0.49 mg/L，去除效率为 71%，而其他阴离子（即氯离子、硫酸盐、溴化物、亚硝酸盐、硝酸盐和氟化物）的去除率分别为 10%、7%、1%、1.5%、4%和 7%。
