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Simultaneous degradation of phenol-Cr(VI) wastewater on air injection plasma electrolysis using titanium anode
Chemical Engineering and Processing: Process Intensification ( IF 4.3 ) Pub Date : 2021-12-24 , DOI: 10.1016/j.cep.2021.108769
Bening Farawan 1 , Ilma Darojatin 2 , Nelson Saksono 1
Affiliation  

Phenol and Cr(VI) are dangerous wastewater were degraded simultaneously by reactive chemical species on plasma electrolysis reactor where direct air injection into plasma zone which titanium as the working electrode. Air injection contributes to increasing the formation of the radical species, such as radical ·OH, ·H, O2·−, and H2O2 molecules, even reducing the energy consumption. The effects of various air injection flow rates, pH, and voltages on phenol–Cr(VI) degradation were observed. The removal efficiency on the binary system was achieved 66% for phenol and 91% for Cr(VI) within 30 min, where the optimum condition of air injection flow rate is 0.2 L min−1 and pH 3.7. The energy efficiency of degradation was compared with that in other competitive processes. Increasing the voltage at constant power decreases the number of ·OH and ·H and increases the number of H2O2 molecules, indicating the formation of new reactive species. This study validated the synergistic effect on the simultaneous oxidation and reduction processes in wastewater.



中文翻译:

钛阳极喷气等离子电解同时降解苯酚-Cr(VI)废水

苯酚和六价铬是一种危险的废水,在等离子体电解反应器中被反应性化学物质同时降解,在等离子体电解反应器中,将空气直接注入等离子体区,钛作为工作电极。空气注入有助于增加自由基物种的形成,例如自由基·OH、·H、O 2 ·-和H 2 O 2分子,甚至降低能量消耗。观察了各种空气注入流速、pH 值和电压对苯酚-Cr(VI) 降解的影响。在 30 分钟内,二元系统对苯酚的去除效率为 66%,对 Cr(VI) 的去除效率为 91%,其中空气注入流速的最佳条件为 0.2 L min -1和 pH 值 3.7。降解的能源效率与其他竞争过程中的能源效率进行了比较。在恒定功率下增加电压会减少·OH 和·H 的数量并增加H 2 O 2分子的数量,表明形成了新的活性物质。该研究验证了对废水中同时氧化和还原过程的协同作用。

更新日期:2021-12-30
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