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 Effect of operating conditions on the yield of 2-hydroxyterephthalic acidfor tracing •OH radical in electrochemical process
Tác giả hoặc Nhóm tác giả: Nguyen Tien Hoang*, Fredrick M. Mwazighe
Nơi đăng: Moscow University Chemistry Bulletin; Số: Volume 77, No. 5;Từ->đến trang: 286-299;Năm: 2022
Lĩnh vực: Tự nhiên; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The boron-doped diamond electrode has been widely applied in electrochemical process for wastewater treatment based on the generation of hydroxyl radicals (•OH). This study investigated the formation efficiency of 2-HTA through the interaction between •OH radical and terephthalic acid (TA) to monitor the •OH formation. Results show that the 2-HTA formation efficiency did not depend on the initial concentration of scavenger (here, TA) in the investigated range of 0.1 to 1 mM TA. Meanwhile, other factors, such as current density, supporting electrolyte, sodium hydroxide have a significant influence. The optimal condition was established: concentration of electrolyte (0.05 M Na2SO4); initial concentration of TA (0.1 mM); concentration of NaOH (1 mM); current density (j = 20 mA cm-2). The selectivity of TA was evaluated by Faradaic efficiency (η) and hydroxylation yield (), indicating that Faradaic efficiency (η) for 2-HTA formation was in the range of 10-5 - 10-7, while the hydroxylation yield of •OH () into 2-HTA was 0.03 - 0.12.
ABSTRACT
The boron-doped diamond electrode has been widely applied in electrochemical process for wastewater treatment based on the generation of hydroxyl radicals (•OH). This study investigated the formation efficiency of 2-HTA through the interaction between •OH radical and terephthalic acid (TA) to monitor the •OH formation. Results show that the 2-HTA formation efficiency did not depend on the initial concentration of scavenger (here, TA) in the investigated range of 0.1 to 1 mM TA. Meanwhile, other factors, such as current density, supporting electrolyte, sodium hydroxide have a significant influence. The optimal condition was established: concentration of electrolyte (0.05 M Na2SO4); initial concentration of TA (0.1 mM); concentration of NaOH (1 mM); current density (j = 20 mA cm-2). The selectivity of TA was evaluated by Faradaic efficiency (η) and hydroxylation yield (), indicating that Faradaic efficiency (η) for 2-HTA formation was in the range of 10-5 - 10-7, while the hydroxylation yield of •OH () into 2-HTA was 0.03 - 0.12.
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