Degradation of Rhodamine B by schwertmannite activated persulfate under UV light

doi:10.19965/j.cnki.iwt.2021-0864

Abstract

Abstract:

UV-catalyzed biosynthesis of schwertmannite（Sch） can effectively activate persulfate（PS） to degrade organic pollutants. Rhodamine B（RhB） was used as the target contaminant，and response surface methodology was used to determine the optimal dosage of Sch and PS under ultraviolet（UV） light，and the effect of free radical contribution and different concentrations of anions on the degradation of RhB in UV/Sch/PS system was also investigated. The results showed that when RhB was 0.01 mmol/L，PS was 0.5 mmol/L and Sch was 0.5 g/L，the degradation rate of RhB could reach 93.7% after 45 min of UV light irradiation. In UV/Sch/PS system，Hydroxyl radical（·OH） was the main active radical，its contribution rate was 40.6%，while the contribution rate of sulfate radical（SO₄ ^·-） was only 12.7%. In addition，the addition of NO₃ ^-，HCO₃ ^-，CO₃ ^2- and low concentration of Cl^- had no significant effect on the degradation of RhB in UV/Sch/PS system，while high concentrations of Cl^- slightly inhibited the degradation of RhB. However，the higher the concentration of H₂PO₄ ^-，the more obvious the inhibitory effect.

Key words: schwertmannite, persulfate, Rhodamine B, advanced oxidation

摘要：

生物合成施氏矿物（Sch）经紫外光催化后可更好地活化过硫酸盐（PS）降解有机污染物质。以罗丹明B（RhB）为目标污染物，采用响应曲面法确定紫外光（UV）下Sch和PS的最佳投加量，并探究了UV/Sch/PS体系中自由基贡献及不同浓度阴离子对RhB降解的影响。结果表明，当RhB浓度为0.01 mmol/L，PS浓度为0.5 mmol/L，Sch质量浓度为0.5 g/L时，在紫外光照射45 min后RhB的降解率可达到93.7%。在UV/Sch/PS体系中，羟基自由基（•OH）是主要的活性自由基，其贡献率为40.6%，而硫酸根自由基（SO₄ ^·-）的贡献率仅为12.7%。此外，NO₃ ^-、HCO₃ ^-、CO₃ ^2-和低浓度的Cl^-加入对RhB的降解均无显著影响，高浓度的Cl^-会对RhB的降解产生轻微抑制作用，而H₂PO₄ ^-的浓度越高则对RhB的降解抑制作用越明显。

关键词: 施氏矿物, 过硫酸盐, 罗丹明B, 高级氧化

CLC Number:

X703.1

Hui LIU, Jiaxing ZHOU, Pengfei REN, Jian ZHANG, Junmei QIN, Wenlong BI, Yue NI, Fenwu LIU. Degradation of Rhodamine B by schwertmannite activated persulfate under UV light[J]. Industrial Water Treatment, 2022, 42(5): 110-116.

刘慧, 周佳兴, 任鹏飞, 张健, 秦俊梅, 毕文龙, 倪月, 刘奋武. 紫外光下施氏矿物活化过硫酸盐降解罗丹明B[J]. 工业水处理, 2022, 42(5): 110-116.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0864

https://www.iwt.cn/EN/Y2022/V42/I5/110

Figures/Tables 6

Fig.1 Scanning electron microscopy，X-ray diffraction spectrum and FTIR spectra of Sch

Fig. 2 Effect of Sch concentration on RhB removal under UV light

Fig.3 Effect of Sch and PS concentration on the degradation of RhB

Fig. 4 Effect of different systems on the removal of RhB

Fig. 5 Free radical contribution to the degradation of RhB in UV/Sch/PS system

Fig.6 Effects of different concentrations of ，，，，Cl^- on the degradation of RhB by UV/Sch/PS system

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