Removal of p-chloronitrobenzene from groundwater: Effectiveness and degradation mechanism of a heterogeneous nanoparticulate zero-valent iron (NZVI)-induced Fenton process
Removal of p-chloronitrobenzene from groundwater: Effectiveness and degradation mechanism of a heterogeneous nanoparticulate zero-valent iron (NZVI)-induced Fenton process
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从地下水中去除对氯硝基苯：异质纳米颗粒零价铁 (NZVI) 诱导芬顿过程的有效性和降解机制
DOI：
10.1016/j.cej.2014.06.013
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发表时间：
2014-11-01
影响因子：
15.1
通讯作者：
Zhu, Jiang
中科院分区：
文献类型：
--
作者：
Li, Bingzhi;Zhu, Jiang
采用非均相纳米粒子零价铁(NZVI)诱导的Fenton过程，研究了对氯硝基苯(p-ClNB)从受污染的地下水中的去除。考察了过氧化氢(H_2O_2)、NZVI投加量、地下水初始pH以及地下水中常见的氯离子、硝酸根离子和硫酸盐根离子等多种因素对处理效果的影响。结果表明，在pH值为3.0、温度为30℃的条件下，当NZVI浓度为268.8 mg/L、H_2O_2浓度为4.90 mm o l/L、p-ClNB初始浓度为60 mg/L时，p-ClNB在30min内即可完全降解，表明NZVI诱导Fenton法对p-ClNB的去除是有效的。P-ClNB的降解符合准一级动力学模型，速率常数随NZVI剂量(0~358 mg/L)和H_2O_2剂量(0~4.90 mm o l/L)的增加而增大。酸性条件有利于p-ClNB的去除，提高地下水初始pH(3.0~11.0)会降低p-ClNB的降解率。SO_4~(2-)对p-ClNB的去除有负面影响，而Cl~-和NO_3~-的影响可以忽略不计。用气相色谱/质谱仪(GC/MS)、液相色谱/质谱仪(LC/MS)和离子色谱仪(IC)对反应过程中的降解中间体、羧酸和氯离子进行了检测。根据这些发现，提出了p-ClNB的降解途径。总之，NZVI诱导的Fenton法是一种非常有前途的地下水修复技术，但在实际应用中应仔细考虑地下水中更复杂的组分。(C)2014爱思唯尔B.V.保留所有权利。
The removal of p-chloronitrobenzene (p-ClNB) from contaminated groundwater of certain chemical relocated site was explored by a heterogeneous nanoparticulate zero-valent iron (NZVI)-induced Fenton process. The effects of various factors, including hydrogen peroxide (H2O2), NZVI dose, and initial pH of groundwater as well as the common components in groundwater such as Cl-, NO3- and SO42- were evaluated. The results showed that p-ClNB can be completely degraded within 30 min at pH 3.0 and 30 degrees C with NZVI 268.8 mg/L, H2O2 4.90 mmol/L and initial p-ClNB 60 mg/L, indicating the effectiveness of the NZVI-induced Fenton process for the p-ClNB removal. The p-ClNB degradation was fitted with a pseudo-first-order kinetic model, and the rate constants were found to increase with the increasing NZVI dose (0-358 mg/L) and H2O2 dose (0-4.90 mmol/L). Acid conditions were favorable to the p-ClNB removal and elevating the initial groundwater pH (3.0-11.0) decreased the p-ClNB degradation rate. SO42- anions had negative effects on p-ClNB removal, whereas the effects of Cl- and NO3- were negligible. On the other hand, the degradation intermediates, carboxylic acids and chloride ion during the reaction process were detected by gas chromatograph/mass spectrometry (GC/MS), liquid chromatography/mass spectrometry (HPLC/MS) and ion chromatography (IC). With these findings, a degradation pathway of p-ClNB was accordingly proposed. In conclusion, the NZVI-induced Fenton process is a highly promising remediation technique for groundwater contaminated by p-ClNB, but more complex components in groundwater should be carefully considered for its practical application. (C) 2014 Elsevier B.V. All rights reserved.