缓蚀剂和氧化剂对碳钢除汞过程中铁浸出的影响

IF 0.2 Q4 MULTIDISCIPLINARY SCIENCES Suranaree Journal of Science and Technology Pub Date : 2023-05-29 DOI:10.55766/sujst-2023-02-e02066
I. W. Azelee, A. Aris, W. A. A. ABU BAKAR
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引用次数: 0

摘要

碘/碘化钾(I2/KI)浸出剂对碳钢多孔表面的单质汞(Hg°)具有有效的处理能力。然而,在被污染的碳钢上进行除汞过程会导致铁(Fe)在材料表面浸出。结果表明,加入咪唑作为缓蚀剂,Fe浸出率降低78.9%,Hg°的去除率仅为55%。与次氯酸钠(NaOCl)和过氧化叔丁基(TBHP)的氧化剂相比,只有过氧乙酸(PAA)对I2/KI反应有积极影响。有趣的是,PAA氧化剂不仅可以将Hg°的去除率提高到99%,将铁的浸出率降低73%,而且可以将处理时间从16小时减少到8小时的一半。而添加NaOCl和TBHP氧化剂时,Hg°的去除率仅为54%和59%,铁的浸出率分别为28.4%和35.8%。
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CORROSION INHIBITOR AND OXIDANTS EFFECT ON IRON LEACHING FROM CARBON STEEL DURING MERCURY REMOVAL
The Iodine/potassium iodide (I2/KI) lixiviant chemical possesses efficient treatment capabilities for elemental mercury (Hg°) removal on carbon steel’s porous surface. However, the mercury removal process on the contaminated carbon steel was observed to cause iron (Fe) to leach on the material’s surface. The results showed that the addition of imidazole as the corrosion inhibitor reduces 78.9% of  Fe leaching with only 55% of Hg° removal. Compared to the oxidants of sodium hypochlorite (NaOCl) and tert-Butyl hydroperoxide (TBHP), only peroxyacetic acid (PAA) possesses a positive influence on the I2/KI reaction. Interestingly, PAA oxidant does not only enhance the Hg° removal up to 99% and reduce 73% of the Fe leaching but also reduces half of the treatment time from 16 to 8 h. While in the addition of NaOCl and TBHP oxidants, the efficiency of the decontamination process was only obtained at 54% and 59% for Hg° removal with 28.4% and 35.8% of Fe leaching, respectively.  
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来源期刊
Suranaree Journal of Science and Technology
Suranaree Journal of Science and Technology MULTIDISCIPLINARY SCIENCES-
CiteScore
0.30
自引率
50.00%
发文量
0
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