DOI: 10.1016/j.watres.2019.02.037
Scopus记录号: 2-s2.0-85062468567
论文题名: Electrocoagulation of tetrafluoroborate (BF 4 − ) and the derived boron and fluorine using aluminum electrodes
作者: Lin J.-Y. ; Raharjo A. ; Hsu L.-H. ; Shih Y.-J. ; Huang Y.-H.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 155 起始页码: 362
结束页码: 371
语种: 英语
英文关键词: Adsorption
; Boric acid
; Co-precipitation
; defluorination
; Ligand exchange
英文摘要: Tetrafluoroborate anion (BF 4 − ) 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 BF 4 − were studied using metallic aluminum as the sacrificial electrode. The dissolved Al(III) from the anode could efficiently decompose BF 4 − 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 BF 4 − , 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 BF 4 − 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: [BF 4 − ] 0 = 9.3 mM, [NaCl] = 10 mM, pH = 8.0, current density = 5 mA/cm 2 , 98.3% of BF 4 − 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 BF 4 –], B(OH) 3 and F − in aqueous solution synergically. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121892
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan; Institute of Environmental Engineering, National Sun Yat-sen University, Kaohsiung, 804, Taiwan; Sustainable Environment Research Center, National Cheng Kung University, Tainan, 701, Taiwan
Recommended Citation:
Lin J.-Y.,Raharjo A.,Hsu L.-H.,et al. Electrocoagulation of tetrafluoroborate (BF 4 − ) and the derived boron and fluorine using aluminum electrodes[J]. Water Research,2019-01-01,155