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Effects of mixing granular iron with sand on the efficiency of methylene blue discoloration

机译：颗粒状铁砂混合对亚甲蓝褪色效率的影响

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The influence of granular sand on the efficiency of metallic iron (Fe~0) for the discoloration of a methylene blue (MB) solution was investigated in the current work. The initial MB concentration was 10 mg L~(-1) and mass loadings within the range of 0-90 g Ir1 for sand and 0-45 g L~(-1) for Fe~0 were applied. The batch reaction vessel used was a graduated essay tube containing 22.0 mL of the MB solution. Shaking intensities of 0 and 75.0 rpm were applied for experimental durations of 7, 21 and 45 days. Results provide clear evidence that both Fe~0 and sand were independently effective for the discoloration of MB. However, the latter material was significantly less effective, recording 54.0% compared to 82.0% recorded for the Fe~0 after 45 days in experiment with 45.0 g L~(-1) of each material. Similarly, mixing 90 g Ir1 sand with 45.0 g L~(-1) of Fe~0 depicted a MB discoloration efficacy of 72.0% demonstrating that the discoloration capability of the Fe~0 was significantly 'masked' by the presence of sand. This observation provides clear evidence to question the common approach of using adsorbents for contaminant accumulation in the vicinity of Fe~0 materials in order to facilitate chemical reduction by Fe~0. Further research is required to determine the relative affinity of different materials that can be used in Fe~0 mixtures for maximum contaminant removal efficacies.
机译：在目前的工作中，研究了粒状砂对金属铁（Fe〜0）使亚甲基蓝（MB）溶液脱色效率的影响。 MB的初始浓度为10 mg L〜（-1），砂的质量载荷为0-90 g Ir1，Fe〜0的质量载荷为0-45 g L〜（-1）。使用的分批反应容器是装有22.0 mL MB溶液的刻度试管。振动强度分别为0和75.0 rpm，实验时间为7天，21天和45天。结果提供了明确的证据，表明Fe〜0和沙子对MB的变色都是独立有效的。然而，后一种材料的效果明显较差，在使用45.0 g L〜（-1）的每种材料进行45天实验后，记录到的Fe〜0的记录为84.0％，而Fe〜0的记录为82.0％。类似地，将90 g Ir1砂与45.0 g L〜（-1）的Fe〜0混合后，MB的褪色效果为72.0％，这表明砂的存在显着地“掩盖了” Fe〜0的褪色能力。该观察结果为质疑使用吸附剂在Fe〜0材料附近积聚污染物以便促进Fe〜0的化学还原的常用方法提供了明确的证据。需要进一步的研究来确定可用于Fe-0混合物中的不同材料的相对亲和力，以实现最大的污染物去除效率。

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