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首页> 外文期刊>Environmental engineering and management journal >REDUCTIVE DECHLORINATION OF POLYCHLORINATED BIPHENYLS (PCBs) BY MEANS OF NANOSCALE ZERO-VALENT NICKEL-IRON (NZVNI) PARTICLES
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REDUCTIVE DECHLORINATION OF POLYCHLORINATED BIPHENYLS (PCBs) BY MEANS OF NANOSCALE ZERO-VALENT NICKEL-IRON (NZVNI) PARTICLES

机译：纳米尺度零价镍-铁（NZVNI）颗粒对多氯联苯（PCB）的还原脱氯

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摘要

Polychlorinated biphenyls (PCBs) are toxic and recalcitrant compounds that can be reductively dechlorinated in the presence of expensive catalyzers, such as bimetallic Fe/Pd nanosized particles. Other Pd-free zerovalent metallic and bimetallic systems, such as Nanoscale Zero Valent Iron (NZVI) and Nanoscale Zero Valent Nickel-Iron (NZVNI) particles, are cheaper and able to promote the dechlorination of aliphatics and aromatics. In this paper, we investigated the dechlorination capability of NZVI (1.67g Fe~0/L) and NZVNI (1.67g Fe~0/L and 0.88g Ni~0/L) particles towards 2,3,4,5-CB (2 mg/L) in water and methanol/water 30% (v/v) solution at room temperature. NZVI proved ineffective in 2,3,4,5-CB dechlorination under both the above-mentioned conditions. On the contrary, NZVNI dechlorinated 7.1±1.8 % and 27.7±0.4 % of the 2,3,4,5-CB occurring in water and in methanol/water solution, respectively, in 8 weeks of incubation. Dechlorination occurred via preferential removal of the less sterically hindered chlorine in meta position 5 and proceeded by removing chlorines in para position and in meta position 3.
机译：多氯联苯（PCB）是有毒且难降解的化合物，可以在昂贵的催化剂（例如双金属Fe / Pd纳米级颗粒）存在下进行还原性脱氯。其他无钯零价金属和双金属体系，例如纳米级零价铁（NZVI）和纳米级零价镍铁（NZVNI）颗粒，价格便宜，并且能够促进脂肪族和芳香族化合物的脱氯作用。本文研究了NZVI（1.67g Fe〜0 / L）和NZVNI（1.67g Fe〜0 / L和0.88g Ni〜0 / L）对2,3,4,5-CB的脱氯能力（2 mg / L）的水溶液和室温下的甲醇/水30％（v / v）溶液。在上述两种条件下，NZVI在2,3,4,5-CB脱氯中均无效。相反，在孵育8周后，NZVNI分别脱除了水中和甲醇/水溶液中2,3,4,5-CB的7.1±1.8％和27.7±0.4％。脱氯是通过优先去除间位5中位阻较小的氯而发生的，然后通过去除对位和间位3中的氯来进行。

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