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Highly active copper in dye discoloration via a heterogeneous Fenton-like process
Journal of the Iranian Chemical Society ( IF 2.4 ) Pub Date : 2020-01-04 , DOI: 10.1007/s13738-019-01846-5
Meriem Hamidani , Souad Djerad , Lakhdar Tifouti , Mohamed Boulkra

This study presents the discoloration of methylene blue by heterogenous Fenton-like process using copper. Copper was prepared with sodium ascorbate, an eco-friendly reagent under atmospheric conditions and characterized using X-ray diffraction and scanning electron microscope analysis. Sub-micron-sized particles were formed and mainly composed of metallic copper Cu with the minor presence of Cu2O. The obtained product (labeled as CuR) was compared to a commercial zero-valent copper (labeled as CuF) in the discoloration process of methylene blue. Different parameters such as copper loading, temperature and initial dye concentration were studied. Under the same conditions, CuR and CuF registered 95.04% and 20.46%, respectively, after 10 min of reaction. The discoloration process was due to the in situ production of H2O2 which was evidenced by permanganate method. It was found the formation of 0.18 mM and 75 µM of H2O2 after 2 min of reaction with CuR and CuF, respectively. The reaction rate with CuR was 5 times faster than that with CuF and both followed a pseudo-first-order reaction kinetic. The high activity observed with CuR was found to be due to the presence of Cu2O.

中文翻译:

高活性铜通过类似Fenton的异型过程使染料变色

这项研究提出了铜异质Fenton样过程中亚甲基蓝的变色。铜是在大气条件下用抗坏血酸钠(一种生态友好型试剂)制备的,并使用X射线衍射和扫描电子显微镜分析进行了表征。形成了亚微米级的颗粒,主要由金属铜Cu和少量的Cu 2 O组成。将所得产品(标记为Cu R)与商用零价铜(标记为Cu F)进行比较。亚甲基蓝的变色过程。研究了铜负载,温度和初始染料浓度等不同参数。在相同条件下,Cu R和Cu F反应10分钟后,分别达到95.04%和20.46%。变色过程归因于原位产生H 2 O 2,高锰酸盐法证明了这一点。与Cu R和Cu F反应2分钟后,分别形成0.18 mM和75 µM H 2 O 2。与Cu R的反应速率比与Cu F的反应速率快5倍,并且都遵循拟一级反应动力学。发现使用Cu R观察到的高活性归因于Cu 2 O的存在。
更新日期:2020-01-04
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