Degradation of Rhodamine B from water by molybdenum-assisted Fenton reaction

doi:10.19965/j.cnki.iwt.2021-0472

Abstract

Abstract:

In order to investigate the degradation efficiency of Rhodamine B（RhB） by molybdenum（Mo） assisted Fenton method，the influences of Fe²⁺ dosage，H₂O₂ dosage，initial pH，molybdenum powder dosage，Cl^- dosage and HA dosage on RhB removal were studied. The results showed that Mo could effectively improve the degradation rate of RhB in the system. As a co-catalyst，Mo could effectively improve the generation efficiency of active hydroxyl radicals. Moreover，the reuse performance of Mo was stable. After 5 cycles，the degradation rate basically remained unchanged. Seven oxidation intermediates were detected by LC-MS/MS，and the oxidation pathway of RhB under the action of hydroxyl radical was speculated.

Key words: Rhodamine B, Fenton reagent, degradation product, molybdenum powder

摘要：

为考察钼（Mo）助催化Fenton法对罗丹明B（RhB）降解的效能，研究了Fe²⁺投加量、过氧化氢（H₂O₂）投加量、初始pH、钼粉投加量、Cl^-投加量、腐殖酸（HA）投加量对RhB去除效果的影响。结果表明：Mo能有效地提升体系中RhB的去除率，Mo作为助催化剂可以有效提升活性羟基自由基的生成效率，且Mo的重复使用性能稳定，经过5次循环利用后，RhB去除率基本保持不变。通过LC-MS/MS技术检测出7种氧化中间产物，推测了RhB在羟基自由基作用下的氧化路径。

关键词: 罗丹明B, Fenton试剂, 降解产物, 钼粉

CLC Number:

X703

Mingli LI, Fengxun TAN, Congwei LUO, Xuedong ZHAI, Daoji WU, Xiaoxiang CHENG. Degradation of Rhodamine B from water by molybdenum-assisted Fenton reaction[J]. Industrial Water Treatment, 2022, 42(2): 143-149.

李明礼, 谭凤训, 罗从伟, 翟学东, 武道吉, 成小翔. 钼助催化Fenton法降解罗丹明B的效能研究[J]. 工业水处理, 2022, 42(2): 143-149.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0472

https://www.iwt.cn/EN/Y2022/V42/I2/143

Figures/Tables 10

Fig. 1 Effect of different Fenton systems（a） and molybdenum powder dosage（b） on RhB removal

Fig. 2 Effect of H₂O₂dosage on RhB removal

Fig. 3 Effect of Fe²⁺ dosage on RhB removal

Fig. 4 Effect of pH on RhB removal

Fig. 5 Effect of Cl^‒ dosage on RhB removal

Fig. 6 Effect of HA dosage on RhB removal

Fig. 7 Cycling tests of RhB degradation co⁃catalyzed by Mo powder

Fig. 8 Total scanning experiment of RhB at different time

Table 1 Oxidation products of RhB decayed by Mo/Fenton

编号	产物	m/z
1	C₂₆H₂₇N₂O₃ ⁺	416
2	C₂₄H₂₃N₂O₃ ⁺	388.1
3	C₂₂H₁₉N₂O₃ ⁺	360
4	C₂₀H₁₆N₂O₃ ⁺	332
5	C₂₀H₁₄NO₃ ⁺	316.8
6	C₁₉H₁₅N₂O⁺	288.1
7	C₁₃H₁₃N₂O⁺	213.2

Fig. 9 Proposed reaction pathway of RhB decayed by Mo/Fenton

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