School of Environment Science, Liaoning University, Shenyang 110036, China.
School of Environment Science, Liaoning University, Shenyang 110036, China.
J Hazard Mater. 2016 Jun 5;310:226-34. doi: 10.1016/j.jhazmat.2016.02.049. Epub 2016 Feb 24.
In this study, a new catalytic degradation technology using microwave induced carbon nanotubes (MW/CNTs) was proposed and applied in the treatment of organic pollutants in aqueous solution. The catalytic activity of three CNTs of 10-20nm, 20-40nm, and 40-60nm diameters were compared. The results showed that organic pollutants such as methyl orange (MO), methyl parathion (MP), sodium dodecyl benzene sulfonate (SDBS), bisphenol A (BPA), and methylene blue (MB) in aqueous solution could be degraded effectively and rapidly in MW/CNTs system. CNTs with diameter of 10-20nm exhibited the highest catalytic activity of the three CNTs under MW irradiation. Further, complete degradation was obtained using 10-20nm CNTs within 7.0min irradiation when 25mL MO solution (25mg/L), 1.2g/L catalyst dose, 450W, 2450MHz, and pH=6.0 were applied. The rate constants (k) for the degradation of SDBS, MB, MP, MO and BPA using 10-20nm CNTs/MW system were 0.726, 0.679, 0.463, 0.334 and 0.168min(-1), respectively. Therefore, this technology may have potential application for the treatment of targeted organic pollutants in wastewaters.
在这项研究中，提出并应用了一种使用微波诱导碳纳米管（MW/CNTs）的新型催化降解技术，用于处理水溶液中的有机污染物。比较了三种直径为 10-20nm、20-40nm 和 40-60nm 的 CNT 的催化活性。结果表明，MW/CNTs 体系可有效快速降解水溶液中的甲基橙（MO）、甲基对硫磷（MP）、十二烷基苯磺酸钠（SDBS）、双酚 A（BPA）和亚甲基蓝（MB）等有机污染物。在 MW 照射下，三种 CNT 中直径为 10-20nm 的 CNT 表现出最高的催化活性。进一步研究发现，在 25mL MO 溶液（25mg/L）、1.2g/L 催化剂剂量、450W、2450MHz 和 pH=6.0 的条件下，使用 10-20nm CNT 可在 7.0min 内实现完全降解。使用 10-20nm CNTs/MW 体系降解 SDBS、MB、MP、MO 和 BPA 的速率常数（k）分别为 0.726、0.679、0.463、0.334 和 0.168min(-1)。因此，该技术可能具有在废水处理中针对目标有机污染物的潜在应用。
