Wu Deli, Liu Yanxia, Duan Dong, Ma Luming
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, School of Environmental Science & Engineering, Tongji University; No. 1239, Siping Road, Shanghai 200092, China E-mail:
Water Sci Technol. 2014;70(9):1548-54. doi: 10.2166/wst.2014.389.
Pyrite cinder (PyC) was employed as a heterogeneous Fenton-like catalyst, and its catalytic activity was evaluated in view of the effects of catalyst dosage, pH and leaching metal ions. PyC showed significant reactivity, and the pseudo-first-order kinetic rate constant for decomposition of H(2)O(2) and degradation of Acid Red B (ARB) were 3.4 and 14.89 (10⁻³ min⁻¹) respectively when pH = 5. When 20 g/L PyC was added into 10 mM H(2)O(2) solution in neutral pH, H(2)O(2) could be completely degraded within 4 h, and more than 90% ARB was removed. Leaching metal ions from PyC were found to have little effect on decomposition of H(2)O(2) or on degradation of ARB. PyC still had high catalytic activity after five successive runs. The decomposition mechanism of H(2)O(2) was analyzed and the Haber-Weiss mechanism was employed in this paper. The electron spin resonance image showed •OH was produced and increased between 3 and 5 min in the PyC catalyzing H(2)O(2) reaction, which demonstrated that PyC had a durable ability to produce •OH.
以硫铁矿烧渣（PyC）作为非均相类芬顿催化剂，并从催化剂用量、pH值和浸出金属离子的影响等方面对其催化活性进行了评估。PyC表现出显著的反应活性，当pH = 5时，H₂O₂分解和酸性红B（ARB）降解的准一级动力学速率常数分别为3.4和14.89（10⁻³ min⁻¹）。当在中性pH值下向10 mM H₂O₂溶液中加入20 g/L PyC时，H₂O₂可在4小时内完全降解，且ARB的去除率超过90%。发现从PyC中浸出的金属离子对H₂O₂分解或ARB降解几乎没有影响。经过连续五次运行后，PyC仍具有较高的催化活性。本文分析了H₂O₂的分解机理并采用了哈伯-维希机理。电子自旋共振图像显示，在PyC催化H₂O₂反应过程中，•OH在3至5分钟内产生并增加，这表明PyC具有持久产生•OH的能力。
