Rapid degradation of azo dye methyl orange using hollow cobalt nanoparticles
Rapid degradation of azo dye methyl orange using hollow cobalt nanoparticles
复制标题
DOI：
10.1016/j.chemosphere.2015.10.040
复制
发表时间：
2016-02-01
期刊：
影响因子：
8.8
通讯作者：
Gu, Zhiyong
中科院分区：
文献类型：
--
作者：
Sha, Yingying;Mathew, Iswarya;Gu, Zhiyong
报道了一种利用空心钴纳米颗粒快速、高效地降解甲基橙的方法。以铝（Al）纳米颗粒为模板材料，采用电替换反应制备了空心Co纳米颗粒。通过测定染料溶液紫外-可见吸收随时间的变化，研究了甲基橙的降解特性，表明在酸性条件下甲基橙的降解速度非常快。在初始甲基橙浓度为100 mg/L （pH = 2.5）、Co纳米颗粒投加量为0.5 g/L的条件下，偶氮染料在4 min内降解效率可达99%，降解恒定速率可达2.444 min(-1)，是其他研究中最高的。与其他几种偶氮染料（包括刚果红、苋菜红和橙G）在相似条件下的脱色速率比较表明，结构简单、分子质量较低的染料脱色速度明显快于结构复杂（分子质量较高）的染料。用空心镍纳米粒子和市售的固体球形Co和Ni纳米粒子对甲基橙进行了降解。结果表明，钴基纳米粒子的降解性能优于镍基纳米粒子，其中空心钴纳米粒子的降解速度最快。空心Co纳米颗粒降解速度快，降解效率高，是一种很有前途的修复甲基橙染料废水的方法。此外，由于其磁性，这些空心Co纳米颗粒易于回收。(C) 2015 Elsevier Ltd.版权所有。
A rapid and efficient method for methyl orange degradation using hollow cobalt (Co) nanoparticles is reported. Hollow Co nanoparticles were fabricated by a galvanic replacement reaction using aluminum (Al) nanoparticles as the template material. The methyl orange degradation characteristics were investigated by measuring the time dependent UV-Vis absorption of the dye solution, which showed a very fast degradation rate under acidic conditions. At an initial methyl orange concentration of 100 mg/L (pH = 2.5) and Co nanoparticle dosage of 0.5 g/L, the azo dye degradation efficiency reached up to 99% within 4 min, and the degradation constant rate was up to 2.444 min(-1), which is the highest value among other studies. A comparison of the decolorization rates at similar conditions with several other azo dyes, including Congo red, Amaranth, and Orange G, showed that the dye with a simpler structure and lower molecular mass decolorized considerably faster than the ones having a more complicated structure (higher molecular mass). The methyl orange degradation was also conducted using hollow nickel (Ni) nanoparticles and commercially available solid spherical Co and Ni nanoparticles. The results showed that Cobased nanoparticles outperformed Ni-based nanoparticles, with the hollow Co nanoparticles exhibiting the fastest degradation rate. Using the hollow Co nanoparticles is a very promising approach for the remediation of methyl orange dye containing wastewater due to the fast degradation rate and high degradation efficiency. In addition, these hollow Co nanoparticles are easily recycled because of their magnetic property. (C) 2015 Elsevier Ltd. All rights reserved.