Valorization of aluminum waste as a heterogeneous catalyst for activation of oxone for sulfate radical-based advanced oxidation process
Valorization of aluminum waste as a heterogeneous catalyst for activation of oxone for sulfate radical-based advanced oxidation process
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DOI：
10.1016/j.seppur.2017.05.033
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发表时间：
2017-09
影响因子：
8.6
通讯作者：
K. Lin;J. Lin;Pei-Yu Li
中科院分区：
文献类型：
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作者：
K. Lin;J. Lin;Pei-Yu Li
虽然零价铝（ZVAl）被认为是用于过硫酸氢钾活化的有前景的催化剂，但相关研究非常有限，并且ZVAl通常由化学试剂级铝获得。然而，由于铝是地球上第三丰富的元素，许多铝废料（AW）很容易用于制备ZVAl，而无需能源密集型采矿和金属加工。在本文中，我们首次提出通过HCl预处理来使AWs价值化以制备ZVAl;通过使阿马兰斯（AMR）染料脱色作为模型试验来评价所得的HCl预处理的AW（HPAW）的过硫酸氢钾活化。通过考察HPAW和过硫酸氢钾的用量、温度、初始pH值以及共存化合物对AMR脱色的影响，研究了HPAW对过硫酸氢钾的活化行为。虽然HPAW产生的电子能诱导OH的生成，但生成的OH不能有效地对AMR进行脱色。而HPAW产生的电子可以“激活”过硫酸氢钾生成SO 4-，使AMR完全快速脱色。这种有效的AMR脱色是由于SO 4-和水与SO 4-反应产生的OH。在中性条件下和高温下，HPAW对过硫酸氢钾的活化非常有利，而共存化合物（例如，NaCl和阴离子表面活性剂）的存在抑制过硫酸氢钾的活化，然后显着抑制AMR脱色。HPAW也可以重复用于Oxone活化，即使没有再生。这些特征表明，AW可以很容易地通过盐酸预处理，并成为一个有效的过硫酸氢钾活化的非均相催化剂。
While zero valent aluminum (ZVAl) is considered as a promising catalyst for Oxone activation, relevant studies are very limited and ZVAl is typically obtained by chemical-reagent grade aluminum. However, as aluminum is the third richest element on earth, many aluminum wastes (AWs) are readily available for preparing ZVAl without energy-intensive mining and metalworking. Herein, we propose for the first time to valorize AWs to prepare ZVAl via HCl-pretreatment; the resulting HCl-pretreated AW (HPAW) is evaluated for Oxone activation by decolorizing Amaranth (AMR) dye as a model test. Oxone activation behaviors by HPAW are investigated by examining various effects on AMR decolorization, including dosages of HPAW and Oxone, temperature, initial pH, and co-existing compounds. Even though electrons from HPAW can induce the formation of OH, the resulting OH could not effectively decolorize AMR. However, the electrons from HPAW can “activate” Oxone to generate SO 4-, which completely and rapidly decolorizes AMR. This effective AMR decolorization is attributed to SO 4-and also to OH derived from the reaction of water with SO 4-. The Oxone activation by HPAW is much favorable under neutral conditions and at elevated temperatures, whereas the presence of co-existing compounds (eg, NaCl and anionic surfactant) inhibits Oxone activation and then AMR decolorization significantly. HPAW can be also reused for Oxone activation even without regeneration. These features demonstrate that AW can be valorized easily by HCl-pretreatment and becomes an efficient heterogeneous catalyst for Oxone activation.