Tetrafluoroborate anion (BF₄^-) is found in the streams of flue-gas desulfurization and borosilicate glasses etching which deteriorates water quality through slow hydrolysis into boric acid and fluoride. Decomposition and electrocoagulation (EC) of BF₄^- were studied using metallic aluminum as the sacrificial electrode. The dissolved Al(III) from the anode could efficiently decompose BF₄^- in forms of fluoroaluminate complexes, and the derived boric acid and fluoride ion were removed by sweep flocculation. Major variables were investigated to optimize EC, including the reaction pH, initial concentration of BF₄^-, current density and electrolyte type. The mechanism of EC process was elucidated with the kinetics of consecutive reactions. Experimental results suggested that the removal of BF₄^- and total fluoride were less influenced by pH, and that of total boron reached a maximum at pH 8 which favored the surface complexation between borate species and EC precipitates. Under the conditions: [BF₄^-]₀ = 9.3 mM, [NaCl] = 10 mM, pH = 8.0, current density = 5 mA/cm², 98.3% of BF₄^- was decomposed and the removal of total fluoride and boron attained 98.2% and 74.1%, respectively within 3 h. EC using the Al electrode outperformed the conventional chemical coagulation and reduced the levels of BF₄-, B(OH)₃ and F^- in aqueous solution synergically.

四氟硼酸根阴离子（BF ₄ ^- ）的烟道气脱硫和硼硅酸盐玻璃的刻蚀，其通过缓慢水解成硼酸和氟恶化水质的流中找到。分解和电BF（EC）和₄ ^-使用金属铝作为牺牲电极进行了研究。来自阳极的熔解Al（III）能有效地分解BF ₄ ^-中的氟络合物的形式，并且所导出的硼酸和氟离子是由扫描絮凝除去。主要变量进行了研究，以优化EC，包括反应pH，BF的初始浓度₄ ^-，电流密度和电解质类型。通过连续反应的动力学阐明了EC过程的机理。实验结果表明，高炉的去除₄ ^-和总氟化物较少受到pH的影响，而总的硼达到在pH 8的最大这有利于硼酸盐物种和EC析出物之间的表面络合。在此条件下：[BF ₄ ^- ] ₀ = 9.3毫米，[氯化钠] = 10毫米，pH值= 8.0，电流密度= 5毫安/厘米²，BF 98.3％₄ ^-分解后，总的氟化物和硼的去除率在3小时内分别达到98.2％和74.1％。EC使用Al电极胜过传统的化学凝固和降低的BF水平₄ - ，B（OH）₃和F ^-在协同地水溶液。