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首页> 外文期刊>RSC Advances >Synthesis of SiO2 coated zero-valent iron/palladium bimetallic nanoparticles and their application in a nano-biological combined system for 2,2′,4,4′-tetrabromodiphenyl ether degradation
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Synthesis of SiO2 coated zero-valent iron/palladium bimetallic nanoparticles and their application in a nano-biological combined system for 2,2′,4,4′-tetrabromodiphenyl ether degradation

机译：SiO2涂层零价铁/钯双金属纳米粒子的合成及其在纳米生物组合体系中的2,2'，4,4'-四溴二苯基醚降解中的应用

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Polybrominated diphenyl ethers (PBDEs) are emerging persistent organic pollutants and the degradation of PBDEs is still a significant challenge owing to their extreme persistence and toxicity. In this study, the remediation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE47) was investigated by employing a nano-biological combined system with SiO _(2) -coated zero-valent iron/palladium bimetallic nanoparticles (SiO _(2) -nZVI/Pd) as a reductant and Pseudomonas putida as a biocatalyst. The SiO _(2) -nZVI/Pd exhibited much lower toxicity to the P. putida strain and higher reactivity in debromination than nZVI/Pd. The strain could grow well when the dosage was up to 1.0 g L ~(?1) . During the combined process, BDE47 (5 mg L ~(?1) ) was completely debrominated to diphenyl ether (DE) within 2 h by SiO _(2) -nZVI/Pd (1.0 g L ~(?1) ) and then DE was completely degraded by P. putida after 4 days in sequential aerobic biodegradation. All the possible intermediates in the whole process were identified by ultra performance liquid chromatography (UPLC) and gas chromatography-mass spectrometer (GC-MS) analyses. The detection of BDE17, BDE7, BDE1 and DE indicated that rapidly stepwise debromination preferentially occurred at para positions in the anaerobic stage. Moreover, during aerobic biodegradation by P. putida , a number of phenolic compounds, such as phenol, catechol and hydroquinone were generated via ring opening by dioxygenation and further mineralized through the tricarboxylic acid cycle (TCA). Importantly, this combined process achieved rapid mineralization of PBDEs and avoided the generation of some highly toxic products like bromophenols and HO–PBDEs, which might have promising application prospects in the remediation of halogenated POPs.
机译：多溴二苯醚（PBDES）是新兴的有机污染物，由于其极端持久性和毒性而导致PBDES的降解仍然是一个重大挑战。在该研究中，通过使用具有SiO_（2）涂料的零价铁/钯双金属纳米粒子（SIO）来研究2,2'，4,4'-四溴二苯醚（BDE47）的修复。（SIO _（2）-NZVI / PD）作为还原剂和假单胞菌帕迪达作为生物催化剂。 SiO _（2）-NZVI / PD对P.Ptida菌株的毒性大得多，比NZVI / Pd的脱溴反应性更高。当剂量高达1.0g l〜（β1）时，应变会很好地生长。在组合过程中，BDE47（5mg L〜（α1））通过SiO _（2）-NZVI / Pd（1.0g l〜（α1））完全枯草至二苯基醚（de）。在续集的有氧生物降解4天后，在4天后，DE在P. Pivida完全降解。全过程中的所有可能的中间体通过超级性能液相色谱（UPLC）和气相色谱 - 质谱仪（GC-MS）分析鉴定。 BDE17，BDE7，BDE1和DE的检测表明，在厌氧阶段的PARA位置中优先发生逐步逐步脱溴。此外，在P. Pieda的有氧生物降解期间，通过通过二氧化环的环开口并通过三羧酸循环（TCA）进一步矿化，产生许多酚类化合物，例如苯酚，儿茶酚和氢醌，并进一步矿化。重要的是，这种组合过程实现了PBDES的快速矿化，避免了溴苯酚和HO-PBDE等一些高度毒性产品，这可能在卤化污染物的修复中具有有希望的应用前景。

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