Sichuan Provincial Sci-Tech Cooperation Base of Low-cost Wastewater Treatment Technology, Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, PR China; NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, Mianyang 621010, PR China.
Sichuan Provincial Sci-Tech Cooperation Base of Low-cost Wastewater Treatment Technology, Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, PR China; Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, PR China.
J Colloid Interface Sci. 2022 Sep 15;622:390-401. doi: 10.1016/j.jcis.2022.04.093. Epub 2022 Apr 22.
Two well-defined CoFe bimetal oxides are prepared from Prussian blue analogues (PBAs) as precursors with designable structures, which are further explored for phosphate removal. A speed-controlled coordination strategy is used to fabricate two CoFe PBA microcrystals with different morphologies, then two regular CoFe oxides are obtained via an intermediate-temperature calcination. CoFeS, a slow-speed coordination product with truncated microcube structure, contains less coordinated water and Fe in its framework, but can create more mesopores and Fe in its oxidative product of CoFeST300. CoFeST300 has been demonstrated to have higher adsorption capacity and affinity for phosphate adsorption compared to that of the fast-speed coordination product, due to its more Fe as effective adsorption sites via ligand exchange. Besides, the inner-sphere complexation mechanism makes CoFeST300 high selectivity for phosphate removal compared to other co-existing anions. The application performance of CoFeST300 is examined by multiple continuous treatment of actual sewage, and the result of all effluent concentrations below 0.5 mg P/L verifies a promising potential of the fabricated adsorbent for phosphorus removal. Thus, design or regulation of the precursors is an efficiency method to fabricate an ideal metal oxide for phosphate adsorption.
两种结构明确的 CoFe 双金属氧化物是由普鲁士蓝类似物 (PBA) 作为前驱体制备的，具有可设计的结构，可进一步用于去除磷酸盐。采用速度控制的配位策略制备了两种具有不同形貌的 CoFe PBA 微晶体，然后通过中温煅烧得到两种规则的 CoFe 氧化物。CoFeS 是一种具有截角微立方体结构的慢速配位产物，其骨架中含有较少的配位水和 Fe，但在其 CoFeST300 的氧化产物中可以产生更多的介孔和 Fe。CoFeST300 表现出比快速配位产物更高的吸附容量和对磷酸盐的吸附亲和力，因为其通过配体交换具有更多的 Fe 作为有效吸附位点。此外，内球络合机制使 CoFeST300 对磷酸盐的去除具有较高的选择性，优于其他共存的阴离子。通过实际污水的多次连续处理来检验 CoFeST300 的应用性能，所有出水浓度均低于 0.5 mg P/L 的结果验证了所制备的吸附剂在除磷方面具有良好的应用前景。因此，前驱体的设计或调控是制备理想的金属氧化物用于磷酸盐吸附的有效方法。
