Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2021-07-30 , DOI: 10.1016/j.jtice.2021.07.035 Mohammad Reza Eskandarian 1, 2 , Maryam Ganjkhanloo 3 , Mohammad Hossein Rasoulifard 1 , Seyed Ali Hosseini 3
|
Background
Removal of organic contaminants by UV-based advanced oxidation processes (AOPs) has been considered as one of the most effective procedures among environmental remediation methods. Ultraviolet light-emitting diodes (UV-LEDs) have possessed a unique place as an emerging technology in AOPs.
Methods
In the present research, the impact of pulsed illumination on the overall efficiency of AR14 degradation by UV-LEDs and persulfate (PS) was considered. In comparison with continuous illumination, pulsed irradiation of UV-LEDs gifts the radiation of light in a programmed order to benefit its flexible pulse pattern, high-frequency utilization, and lower energy consumption attitudes. Duty cycles, pulse periods/frequencies, oxidant, and also removal kinetics were considered as operational parameters.
Significant findings
Outcomes showed the efficacy of UV-LED and PS processes were both quite slow, while the hybrid route, UV-LED/PS showed great ability in degradation of AR14. Results depicted removal efficiency of (~93%) in UV-LED/PS system. Pulsed illumination has shown to be a beneficial technique providing higher output power and improved thermal management. 80% of the Duty cycle and 30 ms of the pulsed period was considered as optimized destruction state. Furthermore, results demonstrated that PS addition to the system significantly enhances the AR14 destruction efficiency by a pseudo-first-order rate constant (k) by 44 times.
中文翻译：
通过 UV-LED/过硫酸盐高级氧化工艺高效去除酸性红 14：脉冲照射、占空比、反应动力学和能源消耗
背景
通过基于紫外线的高级氧化工艺 (AOP) 去除有机污染物已被认为是环境修复方法中最有效的程序之一。紫外发光二极管 (UV-LED) 作为 AOP 中的新兴技术拥有独特的地位。
方法
在本研究中，考虑了脉冲照明对 UV-LED 和过硫酸盐 (PS) 降解 AR14 的整体效率的影响。与连续照明相比，UV-LED 的脉冲照射以程序化的顺序提供光辐射，有利于其灵活的脉冲模式、高频利用和更低的能耗态度。占空比、脉冲周期/频率、氧化剂以及去除动力学都被认为是操作参数。
重要发现
结果表明，UV-LED 和 PS 工艺的功效都相当缓慢，而混合路线 UV-LED/PS 在降解 AR14 方面表现出很强的能力。结果表明 UV-LED/PS 系统中的去除效率为 (~93%)。脉冲照明已被证明是一种有益的技术，可提供更高的输出功率和改进的热管理。80% 的占空比和 30 ms 的脉冲周期被认为是优化的破坏状态。此外，结果表明，将 PS 添加到系统中后，通过伪一级速率常数 (k) 显着提高了 AR14 的破坏效率 44 倍。
京公网安备 11010802027423号