李瑛,肖阳,李筱琴,杨琛.纳米零价铁及其双金属体系对菲的降解研究[J].环境科学学报,2015,35(2):499-507
纳米零价铁及其双金属体系对菲的降解研究
- Degradation of phenanthrene by nanoscale zero-valent iron and its bimetallic nanoparticles
- 基金项目：国家自然科学基金青年基金项目(No.41103050);广东省国际科技合作计划项目(No.2011B050400018);国家自然科学基金面上项目(No.41173104)
- 李瑛
- 华南理工大学环境与能源学院, 广州 510006
- 肖阳
- 成都乐攀环保科技有限公司, 成都 610071
- 李筱琴
- 1. 华南理工大学环境与能源学院, 广州 510006;2. 工业聚集区污染控制与生态修复教育部重点实验室, 华南理工大学, 广州 510006
- 杨琛
- 1. 华南理工大学环境与能源学院, 广州 510006;2. 工业聚集区污染控制与生态修复教育部重点实验室, 华南理工大学, 广州 510006
- 摘要：以实验室合成的纳米零价铁(nZVI)及其双金属(nZVI/Cu和nZVI/Ni)为反应材料,对菲(Phenanthrene)的去除进行研究.表征结果表明:纳米颗粒平均粒径均为80~100 nm,主要以α-Fe0的形式存在.批实验结果表明,5 g·L-1的nZVI, nZVI/Cu和nZVI/Ni对菲溶液均有去除效果,其去除效率依次为nZVI/Ni >nZVI/Cu >nZVI.溶液初始pH为7.5时,5 g·L-1的nZVI/Ni去除88% 0.5 mg·L-1的菲只需3 h,而nZVI/Cu和nZVI分别需要29 h和40 h.3种纳米铁对菲的去除率均随着nZVI投加量的增加而升高,随着菲溶液初始浓度的增加而降低.反应温度的升高可提高nZVI/Ni对菲的去除效率,高温时(≥30 ℃)菲的降解遵循一级反应动力学模型.pH对反应影响不大.GC-MS结果表明,nZVI/Ni降解菲溶液主要为催化加氢反应,而nZVI/Cu和nZVI对菲溶液的去除主要为吸附作用.
- Abstract：Nanoscale zero-valent iron (nZVI) and its bimetallic particles (nZVI/Cu and nZVI/Ni) were synthesized for the removal of phenanthrene. The average diameter of the nanoparticles was 80~100 nm with Fe0 in the form of α-Fe0. Batch experiments demonstrated that 5 g·L-1 of nZVI, nZVI/Cu and nZVI/Ni could effectively remove phenanthrene and the removal efficiency decreased in the order of nZVI/Ni >nZVI/Cu >nZVI. More than 88% of phenanthrene was degraded within 3 h at pH 7.5 by nZVI/Ni, while nZVI/Cu and nZVI required 29 h and 40 h, respectively. Higher dosage of the nanopaticles facilitated the degradation of phenanthrene, while the increase of phenanthrene concentration inhibited the reaction. The degradation rate increased with the increasing reaction temperature and the reaction under high temperature (≥30 ℃) followed a pseudo-first-order kinetics. pH played little role during reactions. GC-MS results indicated that the degradation of phenanthrene by nZVI/Ni was catalytic hydrogenation, while the removal of phenanthrene by nZVI and nZVI/Cu was mainly adsorption.
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