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首页> 外文期刊>Desalination and water treatment >Remediation of hexachlorocyclohexanes by cobalt-mediated activation of peroxymonosulfate
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Remediation of hexachlorocyclohexanes by cobalt-mediated activation of peroxymonosulfate

机译：通过钴介导的过氧键硫酸盐活化来修复六氯环己烷

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Hexachlorocyclohexane isomers (HCHs) are one of the most ubiquitous and most easily detected organochlorine pesticides in environmental samples. This global distribution is enabled by HCH persistence. Moreover, HCH tends to bioaccumulate in human and animal adipose tissue. Since certain HCHs cause central nervous system, reproductive, and other endocrine damages, there is a necessity of a suitable remediation method to remove HCH from contaminated groundwater and soil. This study was conducted to evaluate the potential of peroxymonosulfate (Oxone) induced by cobalt salt (Co(NO3)(2); Co(II)) to degrade HCHs. Cobalt(II) nitrate has been chosen instead of cobalt(II) chloride (which presents better activation properties for Oxone) in order to avoid an excess of chloride interference and more additional chlorination by-products. The optimal conditions (oxidant dose as well as cobalt dose) were determined for spiked water with HCH (0.85M of summed HCH isomers). Optimal oxidant dose was established by running a test with three different Oxone concentrations (molar ratio of Oxone:Co(NO3)(2)1:0.1): 0.06, 0.6, and 6mM. Degradation curves of summed HCH isomers were fitted into the pseudo-first-order kinetic model, and reaction rates are shown to be 0.03, 0.31, and 0.55min(-1) for doses 0.06, 0.6, and 6mM, respectively. Further experiments were carried out to determine the optimal Oxone:Co(NO3)(2) molar ratio. Effectiveness of HCHs decontamination by Oxone:Co(NO3)(2) in various molar ratios was in the order 1:0.11:11:0.011:0.001. It was observed that surplus of Co(NO3)(2) can slow down the degradation rate constants. A reaction between sulfate radicals and Co(NO3)(2) could be responsible for this phenomenon, which can lead to the formation of sulfate ions without HCHs oxidation. In addition, tests with higher HCH dose (close to the solubility limit) were carried out to determine by-products of decontamination. In these tests 2,4,6-trichlorophenol (2,4,6-TCP) was found to be the major intermediate of HCH isomers degradation. Trace levels of the trichlorobenzene (TCB), tetrachlorophenol (TeCP), and pentachlorophenol (PCP) were detected as well. The study revealed that Oxone induced by Co(II) shows a high degradation rate with HCH isomers, which can make it an attractive method for HCHs decontamination in the future.
机译：六氯环己烷异构体（HCHS）是环境样品中最普遍且最容易检测到的有机氯农药之一。通过HCH持久性启用此全局分发。此外，HCH倾向于人和动物脂肪组织中的生物累积。由于某些HCHs导致中枢神经系统，生殖和其他内分泌损伤，因此需要一种合适的修复方法，以从受污染的地下水和土壤中去除HCH。进行该研究以评估由钴盐（CO（NO 3）（2）; CO（II））降解HCH的过氧键磺酸盐（OXONE）的潜力。选择硝酸钴（II）硝酸盐代替氯化钴（II）氯化钴（其呈现出氧酮的更好的活化性能），以避免过量的氯化物干扰等氯化副产物。测定具有HCH的掺入水（氧化剂剂量的氧化剂剂量以及钴剂量）（占总HCH异构体的0.85米）。通过用三种不同的赭石浓度的试验（氧化铁的摩尔比（NO 3）（2）1：0.1）来确定最佳氧化剂剂量（摩尔比：CO（2）1：0.1）：0.06,0.6和6mm。将总结HCH异构体的降解曲线安装在伪一阶动力学模型中，并分别显示为0.06,0.6和6mm的0.03,0.31和0.55min（-1）的反应速率。进行进一步的实验以确定最佳的赭石：CO（NO 3）（2）摩尔比。 HCHS净化的氧化力净化的有效性：CO（NO 3）（2）在各种摩尔比中为1：0.1> 1：1> 1：0.01> 1：0.001。观察到，CO（NO3）（2）的过剩可以减缓降解率常数。硫酸盐基团和CO（NO 3）（2）之间的反应可能是这种现象的原因，这可能导致没有HCHs氧化的硫酸盐离子。另外，进行具有较高HCH剂量的试验（接近溶解度极限）以确定副产物的去污。在这些试验中，发现2,4,6-三氯苯酚（2,4,6-TCP）是HCH异构体的主要中间体降解。还检测到三氯苯（TCB），四氯苯酚（TECP）和五氯苯酚（PCP）的痕量水平。该研究表明，CO（II）诱导的氧尼显示出具有HCH异构体的高降解速率，其可以使其成为未来净化的吸引力的方法。

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