查找使用阿拉丁产品的科研文献

Oxygen-vacancy abundant δ-Bi2O3@PCNF anode for selective phosphate removal with exceptional capacity

Luyi Chen,Jinrui Xu,Hengfeng Qian,Boshuang Zhang,Yu Fu,Jianmao Yang,Jianyun Liu

Excessive phosphate concentration in waterbody will lead to eutrophication and deterioration of water quality. Capacitive deionization (CDI) is an environmental-friendly technique for ion removal, and the phosphate ions can be selectively removed and accumulated by designing the CDI electrode materials with specific phosphate bonding capability. Herein, a δ-Bi 2 O 3 -modified porous carbon nanofiber (δ-Bi 2 O 3 @PCNF) was constructed by solvothermal reaction in the presence of polyhydric alcohols. Due to abundant oxygen vacancies and high flexibility, the δ-Bi 2 O 3 @PCNF was used directly as a self-supporting CDI anode for selective phosphate adsorption. Under the optimized conditions, the adsorption capacity of phosphate arrived at 99.6 mg P/g in 50 mg P/L solution, and the adsorption maximum of 127.5 mg P/g was achieved according to Langmuir adsorption model. In the dual-anion solution containing PO 4 3 – and Cl – , the δ-Bi 2 O 3 @PCNF electrode still maintains the high selectivity, with a P separation factor of 22 (C PO 4 3 – /C Cl – = 1:5, molar ratio) in PO 4 3 – /Cl – mixture. By using the δ-Bi 2 O 3 @PCNF-based CDI device, the actual paddy drainage has realized the ultralow phosphate concentration down to 0.03 mg P/L. The related mechanisms involved in phosphate adsorption on δ-Bi 2 O 3 @PCNF were proposed. This work demonstrates the great potential of CDI technology for low-concentration phosphorus recovery, owing to the high selectivity of the δ-Bi 2 O 3 @PCNF electrode material.