铁碳微电解填料制备及其对亚甲基蓝的降解
Preparation of iron-carbon micro-electrolysis filler for degradation of methylene blue
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摘要: 针对传统铁碳微电解工艺中填料易板结的问题，在较低的烧结温度800 ℃条件下，将铁、活性炭、粘结剂和催化剂按一定配料比混合烧结4 h制备了一种铁碳微电解填料。将印染废水中的染料成分亚甲基蓝作为目标污染物，探究溶液pH、铁碳材料添加量和亚甲基蓝起始浓度等反应条件对亚甲基蓝降解效率的影响。在pH=3，铁碳投加量30 g·L-1，亚甲基蓝浓度10 mg·L-1的条件下，亚甲基蓝的去除率达到55%左右；相同条件下对于微电解填料的循环使用实验中亚甲基蓝的去除率能维持在50%以上，证明了该微电解填料具有连续运行的能力。另外，通过微电解与芬顿反应联用的初步实验发现联用效果对于亚甲基蓝的降解率能大幅度提升至90%以上，证明微电解与芬顿反应联用具有较大的应用潜力。Abstract: During a traditional iron-carbon micro-electrolysis process, the filler tends to harden. To resolve this problem, in this paper, an iron-carbon micro-electrolysis filler (MEF) was prepared by mixing iron, activated carbon, binder, and catalyst, and was then sintered for 4 h at 800 ℃ in a nitrogen atmosphere. Methylene blue (MB) was used as a model pollutant to investigate the performance of the prepared iron-carbon micro-electrolysis filler, and the effects of the reaction parameters, such as solution pH, filler dosage, and initial MB concentration, on the degradation of MB were examined. A MB removal of about 55% was achieved after a reaction time of 60 min under the following reaction conditions: a solution pH of 3.0, a filler dosage of 30 g·L-1, and an initial MB concentration of 10 mg·L-1. The iron-carbon micro-electrolysis filler was recycled with a stable activity at least four times. In addition, combination of the iron-carbon micro-electrolysis process and the Fenton process greatly improved the degradation efficiency for MB, and a high degradation ratio of above 90% was obtained, indicating the great application potential of the combination of iron-carbon micro-electrolysis and the Fenton process.
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Key words:
- iron-carbon micro-electrolysis /
- micro-electrolysis filler /
- methylene blue /
- Fenton
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