文献速递|华中农业大学WR:可见光照射下亚硫酸盐与腐植酸的活化对废水处理的新启示

第一作者：Yanting Pan

通讯作者：冯雄汉 教授

通讯单位：华中农业大学资源与环境学院

DOI:10.1016/j.watres.2024.121773

在本研究中，我们介绍了一种利用 VL 激发亚硫酸盐活化 HA 来降解有机污染物的新方法。通过淬灭试验和电子顺磁共振表征，我们确定了系统中的活性物种并提出了其潜在机制。同时，我们还系统地研究了操作参数和水成分对 ROX 降解的影响。为了进一步评估真实水体中溶解有机物对光活化的影响，我们在天然水中引入亚硫酸盐进行 ROX 降解实验。此外，为了有效利用亚硫酸盐，本研究选择了 CaSO3 作为 S(IV)的来源。 这有效地抑制了 ROS 和亚硫酸盐之间的不良反应。研究结果清楚地表明，VL 激发 HA 活化亚硫酸盐的创新技术在水污染处理中的应用前景十分广阔。

Fig. 1. The variation in ROX degradation percentage across different systems (a) and the corresponding pseudo-second-order kinetic fittings (b); the consumption kinetics of S(IV) across different systems (c); and the variation of dissolved oxygen in the S(IV)/HA/VL system (d). Experimental conditions: [S(IV)] = 1 mM, HA = 5 mg C/L, [ROX] = 5 mg/L, [initial pH] = 6.0 ± 0.05, T = 25 °C.

Fig. 2. Effects of operating parameters on ROX degradation in S(IV)/HA/VL system. (a) initial pH; (b) S(IV) concentration; (c) HA concentration. Experimental conditions: [ROX] = 5 mg/L, [HA] = 1 – 10 mg C/L, [S(IV)] = 0.25 – 2 mM, [initial pH] = 3.0 – 9.0, T = 25 °C.

Fig. 3. Effect of AN(a), TBA (b), EtOH (c), SOD (d), FFA (e) and NaN3 (f) on ROX degradation in the S(IV)/HA/VL system. Experimental conditions: [ROX] = 5 mg/L, [S(IV)] = 1 mM, [HA] = 5 mg C/L, [initial pH] = 6.0 ± 0.05, T = 25 °C.

Fig. 4. DMPO (a) and TEMP (b) spin-trapping EPR spectra of HA /S(IV) /VL system. Experimental conditions: [S(IV)] = 1 mM, [HA] = 5 mg C/L, [initial pH] = 6.0 ± 0.05, T = 25 °C.

Fig. 5. Effect of different atmospheric conditions (a) and TMP (b) on the oxidation of ROX. Experimental conditions: [ROX] = 5 mg/L, [S(IV)] = 1 mM, [HA] = 5 mg C/L, [initial pH] = 6.0 ± 0.05, T = 25 °C.

Fig. 6. Effects of inorganic ions on ROX degradation (a) and the removal rate of ROX (b). Experimental conditions:(a) [ROX] = 5 mg/L, [S(IV)] = 1 mM, [HA] = 5 mg C/L, [initial pH] = 6.0 ± 0.05, inorganic ions = 5 mmol L−1, T = 25 °C;(b) [ROX] = 5 mg/L, [S(IV)] = 1 mM, [HA] = 5 mg C/L, [initial pH] = 6.0 ± 0.05, inorganic ions = 0 - 20 mmol L−1, T = 25 °C.