Geomicrobiology Laboratory, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China.
Geomicrobiology Laboratory, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China; Department of Geology and Environmental Earth Science, Miami University, OH 45056, USA.
J Hazard Mater. 2017 Jun 5;331:88-98. doi: 10.1016/j.jhazmat.2017.01.040. Epub 2017 Feb 11.
1,4-Dioxane is causing a general concern as an emerging contaminant in groundwater environment. Traditional remediation methods can be either inefficient or costly. In this study, we present a cost effective method for possible in situ remediation of 1,4-dioxane. Hydroxyl radicals (OH) produced from oxygenation of structural Fe(II) in ferruginous clay minerals significantly degraded high concentrations of 1,4-dioxane (up to 400μmol/L) within 120h under circumneutral pH and dark condition. The amount of 1,4-dioxane degradation was positively correlated with the amount of OH. The major degradation product of 1,4-dioxane was formic acid. Different clay mineral types, initial Fe(II) concentration, and buffer composition all affected OH production and 1,4-dioxane degradation efficiency. Nontronite, an iron-rich smectite, was a reusable and effective material for sustainable production of OH and 1,4-dioxane degradation, through regeneration of Fe(II) either biologically or chemically. The non-selectivity and strong oxidative power of OH make it a promising agent for remediating various kinds of organic contaminants in aqueous environment.
1,4-二恶烷作为一种新兴的地下水环境污染物引起了普遍关注。传统的修复方法要么效率低下，要么成本高昂。在这项研究中，我们提出了一种经济有效的原位修复 1,4-二恶烷的方法。在中性 pH 值和黑暗条件下，铁染粘土矿物中铁(II)结构的氧化产生的羟基自由基（OH）可在 120 小时内显著降解高达 400μmol/L 的高浓度 1,4-二恶烷。1,4-二恶烷的降解量与 OH 的生成量呈正相关。1,4-二恶烷的主要降解产物是甲酸。不同的粘土矿物类型、初始 Fe(II)浓度和缓冲组成都影响 OH 的生成和 1,4-二恶烷的降解效率。富铁蒙脱石（nontronite）是一种铁含量丰富的蒙脱石，通过生物或化学再生 Fe(II)，可作为可持续产生 OH 和降解 1,4-二恶烷的有效且可重复使用的材料。OH 的非选择性和强氧化性使其成为一种有前途的试剂，可用于修复水相环境中的各种有机污染物。
