Effects of dissolved organic matter on adsorbed Fe(II) reactivity for the reduction of 2-nitrophenol in TiO2 suspensions.
Effects of dissolved organic matter on adsorbed Fe(II) reactivity for the reduction of 2-nitrophenol in TiO2 suspensions.
复制标题
溶解有机物对 TiO2 悬浮液中 2-硝基苯酚还原吸附 Fe(II) 反应性的影响。
DOI：
10.1016/j.chemosphere.2013.04.053
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发表时间：
2013-09
期刊：
影响因子：
8.8
通讯作者：
Li, Fangbai
中科院分区：
文献类型：
--
作者：
Zhu, Zhenke;Tao, Liang;Li, Fangbai
溶解有机物（DOM）广泛存在于水生和陆生环境中。铁是地壳中最丰富的过渡金属。DOM对铁的生物地球化学性质和铁（II）作为还原剂吸附在矿物上的强度均有影响。本研究考察了Fe(II)/DOM相互作用对tio2悬浮液中2-硝基苯酚（2-NP）还原的影响。动力学测量表明，加入DOM（记为O-DOM）会影响吸附Fe（II）的2-NP还原速率(k)，不同分子量的DOM组分（包括MW < 3500 Da （L-DOM）、3500 < MW < 14 000 Da （M-DOM）和MW > 14 000 Da (H-DOM)）对Fe(II)/DOM相互作用影响下的k值有显著差异。在CV测试中，2-NP还原速率的提高导致吸附铁（II）种类的增加和峰值氧化电位值（EP）的负移动。对于不同分子量的DOM分数，在固定的DOM浓度下（O-DOM < L-DOM < M-DOM < H-DOM），墨水的增加（O-DOM < L-DOM < M-DOM < H-DOM）与摩尔电子转移容量（ETC）的增加是一致的。本研究将DOM对Fe（II）还原反应性增强的影响归因于吸附Fe（II）水平的提高和ep值的降低。此外，与其他两种DOM组分相比，含H-DOM组分的tio2悬浮液的ETC值略高，这将进一步提高2-NP的还原率。这些发现促进了对铁(II)/DOM相互作用及其对实际地下环境中污染物命运的影响的一般理解。
Dissolved organic matter (DOM) is widespread in aquatic and terrestrial environments. Iron is the most abundant transition metal in the Earth’s crust. The biogeochemistry of iron and the strength of Fe(II) as a reducing agent while adsorbed on minerals are affected by DOM. This study investigated the effects of Fe(II)/DOM interactions on the reduction of 2-nitrophenol (2-NP) in TiO2suspensions. Kinetic measurements demonstrated that rates (k) of 2-NP reduction by adsorbed Fe(II) species are affected by adding DOM (denoted O-DOM), and the obtainedkvalues under the impact of the Fe(II)/DOM interaction with different molecular weight DOM fractions [including MW < 3500 Da (L-DOM), 3500 < MW < 14 000 Da (M-DOM), and MW > 14 000 Da (H-DOM)] showed significant differences. The enhanced rates of 2-NP reduction contributed to increases in the amount of adsorbed Fe(II) species and negative shifts in peak oxidation potential values (EP) in CV tests. For different molecular weight DOM fractions, increases ink(O-DOM < L-DOM < M-DOM < H-DOM) are consistent with increases in molar electron transfer capacities (ETC) based onkvalues at a fixed DOM concentration (O-DOM < L-DOM < M-DOM < H-DOM). This study attributed the impact of DOM on the enhanced reductive reactivity of Fe(II) to the higher level of adsorbed Fe(II) and the lowerEPvalues. In addition, the ETC values were slightly higher in the TiO2suspension containing the H-DOM fraction as compared the other two DOM fractions, which would further enhance the reduction rate of 2-NP. These findings promote a general understanding of Fe(II)/DOM interactions and their impact on the fate of contaminants in actual subsurface environments.
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影响因子：
13.6
作者：
Qing Ding;H. Wu;Yun Xu;Li Guo;Kaiming Liu;Hui Gao;Hong Yang
通讯作者：
Qing Ding;H. Wu;Yun Xu;Li Guo;Kaiming Liu;Hui Gao;Hong Yang
影响因子：
3.9
作者：
C. Blodau;M. Bauer;S. Regenspurg;D. Macalady
通讯作者：
C. Blodau;M. Bauer;S. Regenspurg;D. Macalady
影响因子：
5
作者：
T. Strathmann;A. Stone
通讯作者：
T. Strathmann;A. Stone
影响因子：
11.4
作者：
Fangbai Li;Liang Tao;C. Feng;Xiang-zhong Li;K. Sun
通讯作者：
Fangbai Li;Liang Tao;C. Feng;Xiang-zhong Li;K. Sun
影响因子：
6.1
作者：
Kothawala, D. N.;Roehm, C.;Moore, T. R.
通讯作者：
Moore, T. R.