School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China; Hubei Provincial Engineering Research Center for Water Quality Safety and Pollution Control, Huazhong University of Science and Technology, Wuhan, 430074, China; Key Laboratory of Water & Wastewater Treatment (MOHURD), Huazhong University of Science and Technology, Wuhan, 430074, China.
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Chemosphere. 2021 Dec;285:131442. doi: 10.1016/j.chemosphere.2021.131442. Epub 2021 Jul 6.
Degradation of tetrabromobisphenol A (TBBPA), an emerging micropollutant, by photo/Fe/sulfite process was investigated under different operational conditions and water matrices. 91% of TBBPA was efficiently degraded within 30 min in the Fe/sulfite system under sunlight irradiation when the initial pH was 6.0, which is much higher than that of TBBPA without irradiation (52%). The acceleration of radical generation and direct photolysis by photo irradiation were responsible for the enhanced TBBPA degradation. Although this process showed better performance on TBBPA degradation in weak acid conditions, the high removal efficiency was also achieved at near-neutral pH. HO, SO and direct photolysis contributed to TBBPA degradation. Direct photolysis and SO presented the dominant contribution. The degradation rate increased with elevating the Fe dose (10-40 μM), but slightly decreased when the Fe dose was further raised to 100 μM. Similarly, the degradation efficiency initially increased with increasing the sulfite dose (100-400 μM), but decreased when the sulfite concentration reached 1000 μM. Dissolved oxygen played a crucial role in TBBPA degradation, the presence of water matrices such as humic acid (0.8-4.0 mg/L), bicarbonate (0.5-10 mM) and chloride (0.5-10 mM) retarded TBBPA degradation. This study proposed a new efficient strategy to enhance TBBPA degradation in the Fe/sulfite process.
光/Fe/亚硫酸盐工艺降解四溴双酚 A（TBBPA）作为一种新兴的环境污染物，在不同的操作条件和水基质下进行了研究。在阳光照射下，当初始 pH 值为 6.0 时，Fe/亚硫酸盐体系中 91%的 TBBPA 在 30 min 内被有效降解，这比没有光照时的 TBBPA 降解速度（52%）要高得多。光辐照促进了自由基的生成和直接光解，从而提高了 TBBPA 的降解效率。尽管该工艺在弱酸条件下对 TBBPA 降解表现出更好的性能，但在近中性 pH 值条件下也能实现高去除效率。HO、SO 和直接光解都有助于 TBBPA 的降解。直接光解和 SO 起主要贡献。随着 Fe 剂量（10-40 μM）的升高，降解速率增加，但当 Fe 剂量进一步升高至 100 μM 时，降解速率略有下降。同样，随着亚硫酸盐剂量（100-400 μM）的增加，降解效率最初也有所提高，但当亚硫酸盐浓度达到 1000 μM 时，降解效率降低。溶解氧在 TBBPA 降解中起着至关重要的作用，腐殖酸（0.8-4.0 mg/L）、碳酸氢盐（0.5-10 mM）和氯化物（0.5-10 mM）等水基质的存在会阻碍 TBBPA 的降解。本研究提出了一种新的有效策略，通过 Fe/亚硫酸盐工艺来增强 TBBPA 的降解。
