氯
氨
化学
无机化学
氮气
氯化物
降级(电信)
光化学
有机化学
计算机科学
电信
作者
Youzhi Ji,Jing Bai,Jinhua Li,Tao Luo,Qiao Li,Zeng Qing-yuan,Baoxue Zhou
出处
期刊:Water Research
[Elsevier]
日期:2017-11-01
卷期号:125: 512-519
被引量:115
标识
DOI:10.1016/j.watres.2017.08.053
摘要
A highly selective method for transforming ammonia nitrogen to N2 was proposed, based on a novel solar-driven photoelectrocatalytic-chlorine radical reactions (PEC-chlorine) system. The PEC-chlorine system was facilitated by a visible light response WO3 nanoplate array (NPA) electrode in an ammonia solution containing chloride ions (Cl−). Under illumination, photoholes from WO3 promote the oxidation of Cl− to chlorine radical (Cl). This radical can selectively transform ammonia nitrogen to N2 (79.9%) and NO3− (19.2%), similar to the breakpoint chlorination reaction. The ammonia nitrogen removal efficiency increased from 10.6% (PEC without Cl−) to 99.9% with the PEC-chlorine system within 90 min operation, which can be attributed to the cyclic reactions between Cl−/Cl and the reaction intermediates (NH2, NHCl, etc.) that expand the degradation reactions from the surface of the electrodes to the whole solution system. Moreover, Cl is the main radical species contributing to the transformation of ammonia nitrogen to N2, which is confirmed by the tBuOH capture experiment. Compared to conventional breakpoint chlorination, the PEC-chlorine system is a more economical and efficient means for ammonia nitrogen degradation because of the fast removal rate, no additional chlorine cost, and its use of clean energy (since it is solar-driven).
科研通智能强力驱动
Strongly Powered by AbleSci AI