There is an urgent need for an eco-friendly and efficient route to treat the organic pollutants in wastewater. Therefore, we report a facile synthesis of carbon nanotube–magnesium oxide composite (CNTs/MgO) which can efficiently activate peroxymonosulfate (PMS) to degrade Rhodamine B (RhB). Fabricated CNTs/MgO was characterized by XRD, FTIR, SEM, TEM, BET, XPS, and Raman. The results showed that the carbon nanotubes uniformly entangled on the MgO whiskers and linked to the MgO by Mg–C and C–O bonds. The effects of temperature, pH value, CNTs/MgO dosage, PMS dosage and the ratio of MgO/CNTs on degradation of RhB were conducted to determine the activation performance of CNTs/MgO. The catalytic degradation process was carried out in a wide pH range of 3–9, and 100% of RhB was degraded in 20 min under optimized conditions. Moreover, the efficient degradation performance was attributed to singlet oxygen generated in the PMS&CNTs/MgO system. The excellent activation properties of CNTs/MgO was derived from the enhanced electron transport performance and chemical bonding between MgO and CNTs. In addition, this work provides an innovative design for the development of novel PMS catalysts without transition metal components.

中文翻译：

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一种新型碳纳米管-氧化镁复合材料，具有优异的可回收性，可有效激活过硫酸盐降解罗丹明 B

迫切需要一种环保、高效的途径来处理废水中的有机污染物。因此，我们报告了一种简便合成的碳纳米管-氧化镁复合材料（CNTs/MgO），它可以有效地激活过硫酸盐（PMS）以降解罗丹明 B（RhB）。通过 XRD、FTIR、SEM、TEM、BET、XPS 和拉曼对制备的 CNTs/MgO 进行表征。结果表明，碳纳米管均匀地缠绕在 MgO 晶须上，并通过 Mg-C 和 C-O 键与 MgO 连接。研究了温度、pH值、CNTs/MgO用量、PMS用量和MgO/CNTs比例对RhB降解的影响，以确定CNTs/MgO的活化性能。催化降解过程在 3-9 的宽 pH 范围内进行，在优化条件下，20 分钟内可降解 100% 的 RhB。而且，有效的降解性能归因于 PMS&CNTs/MgO 系统中产生的单线态氧。CNTs/MgO 优异的活化性能源于增强的电子传输性能和 MgO 和 CNTs 之间的化学键合。此外，这项工作为开发不含过渡金属成分的新型 PMS 催化剂提供了创新设计。