Enhanced degradation of 4-nitrophenol by microwave assisted Fe/EDTA process

被引：23

作者：

Liu, Bo ^{[1
]}

Li, Song ^{[1
]}

Zhao, Yongjun ^{[2
]}

Wu, Wenfei ^{[1
]}

Zhang, Xuxiang ^{[2
]}

Gu, Xueyuan ^{[1
]}

Li, Ruihua ^{[1
]}

Yang, Shaogui ^{[1
]}

机构：

[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Sch Life Sci, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2010年 / 176卷 / 1-3期

关键词：

4-Nitrophenol; EDTA; Zero-valent iron; Microwave; Degradation; Biodegradability; ZERO-VALENT IRON; ELECTROCHEMICAL TREATMENT; OXIDATIVE DECOMPOSITION; P-NITROPHENOL; RHODAMINE-B; TEMPERATURE; IRRADIATION; ACTIVATION; REMOVAL; EDTA;

D O I：

10.1016/j.jhazmat.2009.11.015

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A microwave assisted zero-valent iron oxidation process was studied in order to investigate the synergetic effects of MW irradiation on Fe/EDTA system (Fe/EDTA/MW) treated 4-nitrophenol (4-NP) from aqueous solution. The results indicated that the thermal effect of microwave improved the removal effect of 4-NP and TOC through raising the temperature of the system, as well as the non-thermal effect generated by the interaction between the microwave and the Fe resulting in an increase in the hydrophobic character of Fe surface. During the degradation of 4-NP in Fe/EDTA/MW system, the optimum value for MW power, Fe. EDTA dosage was 400 W, 2 g and 0.4 mM, respectively. The possible pathway for degrading the 4-NP was proposed based on CC/MS and HPLC analysis of the degradation intermediates. The concentration change course of the main bio-refractory by-products, the aminophenol formed in the degradation of 4-NP suggested a more efficient degradation and mineralization in Fe/EDTA/MW system. Finally, BOD5/CODCr of the solution increased from 0.237 to 0.635 after reaction for 18 min, indicating that the biodegradability of wastewater was greatly improved by Fe/EDTA/MW system and would benefit to further treatment by biochemical methods. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.

引用

页码：213 / 219

页数：7

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