Main factors for photocatalytic degradation of rhodamine B by MoS2 activated PMS

•The impact of coexisting substances on RhB removal by MoS2/PMS/light was studied.•Cl− had a facilitative effect on the photochemical degradation process.•Humic acid showed significant inhibitory effect on RhB degradation.•·OH and SO4−· were the main active free radicals in the MoS2/PMS/light system...

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Bibliographic Details
Published in:Materials letters 2023-06, Vol.341, p.134191, Article 134191
Main Authors: Li, Yinghua, Li, Mengxi, Zhu, Chaoqun, Liu, Lu, Li, Haibo, Chen, Xi
Format: Article
Language:English
Subjects:
Influencing factors
Metallic composites
Organic
Oxidation
Peroxymonosulfate
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Summary:•The impact of coexisting substances on RhB removal by MoS2/PMS/light was studied.•Cl− had a facilitative effect on the photochemical degradation process.•Humic acid showed significant inhibitory effect on RhB degradation.•·OH and SO4−· were the main active free radicals in the MoS2/PMS/light system. Towards highly efficient photocatalysis of peroxymonosulfate (PMS), heterogeneous catalyst MoS2 was prepared by hydrothermal method. The degradation efficiency of MoS2/PMS/light on Rhodamine B (RhB) was analyzed. The results indicated that the optimal conditions were: PMS concentration 2.0 mg/L, pH 5 and MoS2 dose 1.2 mg/L. Under these conditions, 71.23 ± 0.75% RhB was degraded, which was 2.67 times that of PMS alone. Cl− had a facilitative effect, and the degradation rate increased from 0.569 × 10−2 min−1 to 0.971 × 10−2 min−1, while humic acid showed significant inhibitory effect. According to the free radical trapping experiment, ·OH and SO4−· were the main active free radicals in the MoS2/PMS/light system.
ISSN:0167-577X
DOI:10.1016/j.matlet.2023.134191